From: Jialin Wang <wangjialin23@xxxxxxxxxx> The new RDMA live migration will be introduced in the upcoming few commits. Signed-off-by: Jialin Wang <wangjialin23@xxxxxxxxxx> Signed-off-by: Gonglei <arei.gonglei@xxxxxxxxxx> --- docs/rdma.txt | 420 ---- meson.build | 6 - migration/meson.build | 1 - migration/migration-stats.c | 5 +- migration/migration-stats.h | 4 - migration/migration.c | 20 - migration/migration.h | 9 - migration/options.c | 16 - migration/options.h | 2 - migration/qemu-file.c | 1 - migration/ram.c | 90 +- migration/rdma.c | 4184 ---------------------------------- migration/rdma.h | 69 - migration/savevm.c | 2 +- migration/trace-events | 68 +- qapi/migration.json | 13 +- scripts/analyze-migration.py | 3 - 17 files changed, 10 insertions(+), 4903 deletions(-) delete mode 100644 docs/rdma.txt delete mode 100644 migration/rdma.c delete mode 100644 migration/rdma.h diff --git a/docs/rdma.txt b/docs/rdma.txt deleted file mode 100644 index bd8dd799a9..0000000000 --- a/docs/rdma.txt +++ /dev/null @@ -1,420 +0,0 @@ -(RDMA: Remote Direct Memory Access) -RDMA Live Migration Specification, Version # 1 -============================================== -Wiki: https://wiki.qemu.org/Features/RDMALiveMigration -Github: git@xxxxxxxxxx:hinesmr/qemu.git, 'rdma' branch - -Copyright (C) 2013 Michael R. Hines <mrhines@xxxxxxxxxx> - -An *exhaustive* paper (2010) shows additional performance details -linked on the QEMU wiki above. - -Contents: -========= -* Introduction -* Before running -* Running -* Performance -* RDMA Migration Protocol Description -* Versioning and Capabilities -* QEMUFileRDMA Interface -* Migration of VM's ram -* Error handling -* TODO - -Introduction: -============= - -RDMA helps make your migration more deterministic under heavy load because -of the significantly lower latency and higher throughput over TCP/IP. This is -because the RDMA I/O architecture reduces the number of interrupts and -data copies by bypassing the host networking stack. In particular, a TCP-based -migration, under certain types of memory-bound workloads, may take a more -unpredictable amount of time to complete the migration if the amount of -memory tracked during each live migration iteration round cannot keep pace -with the rate of dirty memory produced by the workload. - -RDMA currently comes in two flavors: both Ethernet based (RoCE, or RDMA -over Converged Ethernet) as well as Infiniband-based. This implementation of -migration using RDMA is capable of using both technologies because of -the use of the OpenFabrics OFED software stack that abstracts out the -programming model irrespective of the underlying hardware. - -Refer to openfabrics.org or your respective RDMA hardware vendor for -an understanding on how to verify that you have the OFED software stack -installed in your environment. You should be able to successfully link -against the "librdmacm" and "libibverbs" libraries and development headers -for a working build of QEMU to run successfully using RDMA Migration. - -BEFORE RUNNING: -=============== - -Use of RDMA during migration requires pinning and registering memory -with the hardware. This means that memory must be physically resident -before the hardware can transmit that memory to another machine. -If this is not acceptable for your application or product, then the use -of RDMA migration may in fact be harmful to co-located VMs or other -software on the machine if there is not sufficient memory available to -relocate the entire footprint of the virtual machine. If so, then the -use of RDMA is discouraged and it is recommended to use standard TCP migration. - -Experimental: Next, decide if you want dynamic page registration. -For example, if you have an 8GB RAM virtual machine, but only 1GB -is in active use, then enabling this feature will cause all 8GB to -be pinned and resident in memory. This feature mostly affects the -bulk-phase round of the migration and can be enabled for extremely -high-performance RDMA hardware using the following command: - -QEMU Monitor Command: -$ migrate_set_capability rdma-pin-all on # disabled by default - -Performing this action will cause all 8GB to be pinned, so if that's -not what you want, then please ignore this step altogether. - -On the other hand, this will also significantly speed up the bulk round -of the migration, which can greatly reduce the "total" time of your migration. -Example performance of this using an idle VM in the previous example -can be found in the "Performance" section. - -Note: for very large virtual machines (hundreds of GBs), pinning all -*all* of the memory of your virtual machine in the kernel is very expensive -may extend the initial bulk iteration time by many seconds, -and thus extending the total migration time. However, this will not -affect the determinism or predictability of your migration you will -still gain from the benefits of advanced pinning with RDMA. - -RUNNING: -======== - -First, set the migration speed to match your hardware's capabilities: - -QEMU Monitor Command: -$ migrate_set_parameter max-bandwidth 40g # or whatever is the MAX of your RDMA device - -Next, on the destination machine, add the following to the QEMU command line: - -qemu ..... -incoming rdma:host:port - -Finally, perform the actual migration on the source machine: - -QEMU Monitor Command: -$ migrate -d rdma:host:port - -PERFORMANCE -=========== - -Here is a brief summary of total migration time and downtime using RDMA: -Using a 40gbps infiniband link performing a worst-case stress test, -using an 8GB RAM virtual machine: - -Using the following command: -$ apt-get install stress -$ stress --vm-bytes 7500M --vm 1 --vm-keep - -1. Migration throughput: 26 gigabits/second. -2. Downtime (stop time) varies between 15 and 100 milliseconds. - -EFFECTS of memory registration on bulk phase round: - -For example, in the same 8GB RAM example with all 8GB of memory in -active use and the VM itself is completely idle using the same 40 gbps -infiniband link: - -1. rdma-pin-all disabled total time: approximately 7.5 seconds @ 9.5 Gbps -2. rdma-pin-all enabled total time: approximately 4 seconds @ 26 Gbps - -These numbers would of course scale up to whatever size virtual machine -you have to migrate using RDMA. - -Enabling this feature does *not* have any measurable affect on -migration *downtime*. This is because, without this feature, all of the -memory will have already been registered already in advance during -the bulk round and does not need to be re-registered during the successive -iteration rounds. - -RDMA Protocol Description: -========================== - -Migration with RDMA is separated into two parts: - -1. The transmission of the pages using RDMA -2. Everything else (a control channel is introduced) - -"Everything else" is transmitted using a formal -protocol now, consisting of infiniband SEND messages. - -An infiniband SEND message is the standard ibverbs -message used by applications of infiniband hardware. -The only difference between a SEND message and an RDMA -message is that SEND messages cause notifications -to be posted to the completion queue (CQ) on the -infiniband receiver side, whereas RDMA messages (used -for VM's ram) do not (to behave like an actual DMA). - -Messages in infiniband require two things: - -1. registration of the memory that will be transmitted -2. (SEND only) work requests to be posted on both - sides of the network before the actual transmission - can occur. - -RDMA messages are much easier to deal with. Once the memory -on the receiver side is registered and pinned, we're -basically done. All that is required is for the sender -side to start dumping bytes onto the link. - -(Memory is not released from pinning until the migration -completes, given that RDMA migrations are very fast.) - -SEND messages require more coordination because the -receiver must have reserved space (using a receive -work request) on the receive queue (RQ) before QEMUFileRDMA -can start using them to carry all the bytes as -a control transport for migration of device state. - -To begin the migration, the initial connection setup is -as follows (migration-rdma.c): - -1. Receiver and Sender are started (command line or libvirt): -2. Both sides post two RQ work requests -3. Receiver does listen() -4. Sender does connect() -5. Receiver accept() -6. Check versioning and capabilities (described later) - -At this point, we define a control channel on top of SEND messages -which is described by a formal protocol. Each SEND message has a -header portion and a data portion (but together are transmitted -as a single SEND message). - -Header: - * Length (of the data portion, uint32, network byte order) - * Type (what command to perform, uint32, network byte order) - * Repeat (Number of commands in data portion, same type only) - -The 'Repeat' field is here to support future multiple page registrations -in a single message without any need to change the protocol itself -so that the protocol is compatible against multiple versions of QEMU. -Version #1 requires that all server implementations of the protocol must -check this field and register all requests found in the array of commands located -in the data portion and return an equal number of results in the response. -The maximum number of repeats is hard-coded to 4096. This is a conservative -limit based on the maximum size of a SEND message along with empirical -observations on the maximum future benefit of simultaneous page registrations. - -The 'type' field has 12 different command values: - 1. Unused - 2. Error (sent to the source during bad things) - 3. Ready (control-channel is available) - 4. QEMU File (for sending non-live device state) - 5. RAM Blocks request (used right after connection setup) - 6. RAM Blocks result (used right after connection setup) - 7. Compress page (zap zero page and skip registration) - 8. Register request (dynamic chunk registration) - 9. Register result ('rkey' to be used by sender) - 10. Register finished (registration for current iteration finished) - 11. Unregister request (unpin previously registered memory) - 12. Unregister finished (confirmation that unpin completed) - -A single control message, as hinted above, can contain within the data -portion an array of many commands of the same type. If there is more than -one command, then the 'repeat' field will be greater than 1. - -After connection setup, message 5 & 6 are used to exchange ram block -information and optionally pin all the memory if requested by the user. - -After ram block exchange is completed, we have two protocol-level -functions, responsible for communicating control-channel commands -using the above list of values: - -Logically: - -qemu_rdma_exchange_recv(header, expected command type) - -1. We transmit a READY command to let the sender know that - we are *ready* to receive some data bytes on the control channel. -2. Before attempting to receive the expected command, we post another - RQ work request to replace the one we just used up. -3. Block on a CQ event channel and wait for the SEND to arrive. -4. When the send arrives, librdmacm will unblock us. -5. Verify that the command-type and version received matches the one we expected. - -qemu_rdma_exchange_send(header, data, optional response header & data): - -1. Block on the CQ event channel waiting for a READY command - from the receiver to tell us that the receiver - is *ready* for us to transmit some new bytes. -2. Optionally: if we are expecting a response from the command - (that we have not yet transmitted), let's post an RQ - work request to receive that data a few moments later. -3. When the READY arrives, librdmacm will - unblock us and we immediately post a RQ work request - to replace the one we just used up. -4. Now, we can actually post the work request to SEND - the requested command type of the header we were asked for. -5. Optionally, if we are expecting a response (as before), - we block again and wait for that response using the additional - work request we previously posted. (This is used to carry - 'Register result' commands #6 back to the sender which - hold the rkey need to perform RDMA. Note that the virtual address - corresponding to this rkey was already exchanged at the beginning - of the connection (described below). - -All of the remaining command types (not including 'ready') -described above all use the aforementioned two functions to do the hard work: - -1. After connection setup, RAMBlock information is exchanged using - this protocol before the actual migration begins. This information includes - a description of each RAMBlock on the server side as well as the virtual addresses - and lengths of each RAMBlock. This is used by the client to determine the - start and stop locations of chunks and how to register them dynamically - before performing the RDMA operations. -2. During runtime, once a 'chunk' becomes full of pages ready to - be sent with RDMA, the registration commands are used to ask the - other side to register the memory for this chunk and respond - with the result (rkey) of the registration. -3. Also, the QEMUFile interfaces also call these functions (described below) - when transmitting non-live state, such as devices or to send - its own protocol information during the migration process. -4. Finally, zero pages are only checked if a page has not yet been registered - using chunk registration (or not checked at all and unconditionally - written if chunk registration is disabled. This is accomplished using - the "Compress" command listed above. If the page *has* been registered - then we check the entire chunk for zero. Only if the entire chunk is - zero, then we send a compress command to zap the page on the other side. - -Versioning and Capabilities -=========================== -Current version of the protocol is version #1. - -The same version applies to both for protocol traffic and capabilities -negotiation. (i.e. There is only one version number that is referred to -by all communication). - -librdmacm provides the user with a 'private data' area to be exchanged -at connection-setup time before any infiniband traffic is generated. - -Header: - * Version (protocol version validated before send/recv occurs), - uint32, network byte order - * Flags (bitwise OR of each capability), - uint32, network byte order - -There is no data portion of this header right now, so there is -no length field. The maximum size of the 'private data' section -is only 192 bytes per the Infiniband specification, so it's not -very useful for data anyway. This structure needs to remain small. - -This private data area is a convenient place to check for protocol -versioning because the user does not need to register memory to -transmit a few bytes of version information. - -This is also a convenient place to negotiate capabilities -(like dynamic page registration). - -If the version is invalid, we throw an error. - -If the version is new, we only negotiate the capabilities that the -requested version is able to perform and ignore the rest. - -Currently there is only one capability in Version #1: dynamic page registration - -Finally: Negotiation happens with the Flags field: If the primary-VM -sets a flag, but the destination does not support this capability, it -will return a zero-bit for that flag and the primary-VM will understand -that as not being an available capability and will thus disable that -capability on the primary-VM side. - -QEMUFileRDMA Interface: -======================= - -QEMUFileRDMA introduces a couple of new functions: - -1. qemu_rdma_get_buffer() (QEMUFileOps rdma_read_ops) -2. qemu_rdma_put_buffer() (QEMUFileOps rdma_write_ops) - -These two functions are very short and simply use the protocol -describe above to deliver bytes without changing the upper-level -users of QEMUFile that depend on a bytestream abstraction. - -Finally, how do we handoff the actual bytes to get_buffer()? - -Again, because we're trying to "fake" a bytestream abstraction -using an analogy not unlike individual UDP frames, we have -to hold on to the bytes received from control-channel's SEND -messages in memory. - -Each time we receive a complete "QEMU File" control-channel -message, the bytes from SEND are copied into a small local holding area. - -Then, we return the number of bytes requested by get_buffer() -and leave the remaining bytes in the holding area until get_buffer() -comes around for another pass. - -If the buffer is empty, then we follow the same steps -listed above and issue another "QEMU File" protocol command, -asking for a new SEND message to re-fill the buffer. - -Migration of VM's ram: -==================== - -At the beginning of the migration, (migration-rdma.c), -the sender and the receiver populate the list of RAMBlocks -to be registered with each other into a structure. -Then, using the aforementioned protocol, they exchange a -description of these blocks with each other, to be used later -during the iteration of main memory. This description includes -a list of all the RAMBlocks, their offsets and lengths, virtual -addresses and possibly includes pre-registered RDMA keys in case dynamic -page registration was disabled on the server-side, otherwise not. - -Main memory is not migrated with the aforementioned protocol, -but is instead migrated with normal RDMA Write operations. - -Pages are migrated in "chunks" (hard-coded to 1 Megabyte right now). -Chunk size is not dynamic, but it could be in a future implementation. -There's nothing to indicate that this is useful right now. - -When a chunk is full (or a flush() occurs), the memory backed by -the chunk is registered with librdmacm is pinned in memory on -both sides using the aforementioned protocol. -After pinning, an RDMA Write is generated and transmitted -for the entire chunk. - -Chunks are also transmitted in batches: This means that we -do not request that the hardware signal the completion queue -for the completion of *every* chunk. The current batch size -is about 64 chunks (corresponding to 64 MB of memory). -Only the last chunk in a batch must be signaled. -This helps keep everything as asynchronous as possible -and helps keep the hardware busy performing RDMA operations. - -Error-handling: -=============== - -Infiniband has what is called a "Reliable, Connected" -link (one of 4 choices). This is the mode in which -we use for RDMA migration. - -If a *single* message fails, -the decision is to abort the migration entirely and -cleanup all the RDMA descriptors and unregister all -the memory. - -After cleanup, the Virtual Machine is returned to normal -operation the same way that would happen if the TCP -socket is broken during a non-RDMA based migration. - -TODO: -===== -1. Currently, 'ulimit -l' mlock() limits as well as cgroups swap limits - are not compatible with infiniband memory pinning and will result in - an aborted migration (but with the source VM left unaffected). -2. Use of the recent /proc/<pid>/pagemap would likely speed up - the use of KSM and ballooning while using RDMA. -3. Also, some form of balloon-device usage tracking would also - help alleviate some issues. -4. Use LRU to provide more fine-grained direction of UNREGISTER - requests for unpinning memory in an overcommitted environment. -5. Expose UNREGISTER support to the user by way of workload-specific - hints about application behavior. diff --git a/meson.build b/meson.build index 6386607144..3894f1f942 100644 --- a/meson.build +++ b/meson.build @@ -2425,12 +2425,6 @@ if rbd.found() dependencies: rbd, prefix: '#include <rbd/librbd.h>')) endif -if rdma.found() - config_host_data.set('HAVE_IBV_ADVISE_MR', - cc.has_function('ibv_advise_mr', - dependencies: rdma, - prefix: '#include <infiniband/verbs.h>')) -endif have_asan_fiber = false if get_option('sanitizers') and \ diff --git a/migration/meson.build b/migration/meson.build index bdc3244bce..4e8a9ccf3e 100644 --- a/migration/meson.build +++ b/migration/meson.build @@ -37,7 +37,6 @@ else system_ss.add(files('colo-stubs.c')) endif -system_ss.add(when: rdma, if_true: files('rdma.c')) system_ss.add(when: zstd, if_true: files('multifd-zstd.c')) specific_ss.add(when: 'CONFIG_SYSTEM_ONLY', diff --git a/migration/migration-stats.c b/migration/migration-stats.c index f690b98a03..9bc8d7018f 100644 --- a/migration/migration-stats.c +++ b/migration/migration-stats.c @@ -62,9 +62,8 @@ void migration_rate_reset(void) uint64_t migration_transferred_bytes(void) { uint64_t multifd = stat64_get(&mig_stats.multifd_bytes); - uint64_t rdma = stat64_get(&mig_stats.rdma_bytes); uint64_t qemu_file = stat64_get(&mig_stats.qemu_file_transferred); - trace_migration_transferred_bytes(qemu_file, multifd, rdma); - return qemu_file + multifd + rdma; + trace_migration_transferred_bytes(qemu_file, multifd); + return qemu_file + multifd; } diff --git a/migration/migration-stats.h b/migration/migration-stats.h index 05290ade76..6b87e133f1 100644 --- a/migration/migration-stats.h +++ b/migration/migration-stats.h @@ -93,10 +93,6 @@ typedef struct { * Maximum amount of data we can send in a cycle. */ Stat64 rate_limit_max; - /* - * Number of bytes sent through RDMA. - */ - Stat64 rdma_bytes; /* * Number of pages transferred that were full of zeros. */ diff --git a/migration/migration.c b/migration/migration.c index e1b269624c..6b9ad4ff5f 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -25,7 +25,6 @@ #include "sysemu/runstate.h" #include "sysemu/sysemu.h" #include "sysemu/cpu-throttle.h" -#include "rdma.h" #include "ram.h" #include "migration/global_state.h" #include "migration/misc.h" @@ -645,18 +644,6 @@ static void qemu_start_incoming_migration(const char *uri, bool has_channels, } else if (saddr->type == SOCKET_ADDRESS_TYPE_FD) { fd_start_incoming_migration(saddr->u.fd.str, errp); } -#ifdef CONFIG_RDMA - } else if (addr->transport == MIGRATION_ADDRESS_TYPE_RDMA) { - if (migrate_xbzrle()) { - error_setg(errp, "RDMA and XBZRLE can't be used together"); - return; - } - if (migrate_multifd()) { - error_setg(errp, "RDMA and multifd can't be used together"); - return; - } - rdma_start_incoming_migration(&addr->u.rdma, errp); -#endif } else if (addr->transport == MIGRATION_ADDRESS_TYPE_EXEC) { exec_start_incoming_migration(addr->u.exec.args, errp); } else if (addr->transport == MIGRATION_ADDRESS_TYPE_FILE) { @@ -744,9 +731,7 @@ process_incoming_migration_co(void *opaque) migrate_set_state(&mis->state, MIGRATION_STATUS_SETUP, MIGRATION_STATUS_ACTIVE); - mis->loadvm_co = qemu_coroutine_self(); ret = qemu_loadvm_state(mis->from_src_file); - mis->loadvm_co = NULL; trace_vmstate_downtime_checkpoint("dst-precopy-loadvm-completed"); @@ -1668,7 +1653,6 @@ int migrate_init(MigrationState *s, Error **errp) s->iteration_initial_bytes = 0; s->threshold_size = 0; s->switchover_acked = false; - s->rdma_migration = false; /* * set mig_stats memory to zero for a new migration */ @@ -2062,10 +2046,6 @@ void qmp_migrate(const char *uri, bool has_channels, } else if (saddr->type == SOCKET_ADDRESS_TYPE_FD) { fd_start_outgoing_migration(s, saddr->u.fd.str, &local_err); } -#ifdef CONFIG_RDMA - } else if (addr->transport == MIGRATION_ADDRESS_TYPE_RDMA) { - rdma_start_outgoing_migration(s, &addr->u.rdma, &local_err); -#endif } else if (addr->transport == MIGRATION_ADDRESS_TYPE_EXEC) { exec_start_outgoing_migration(s, addr->u.exec.args, &local_err); } else if (addr->transport == MIGRATION_ADDRESS_TYPE_FILE) { diff --git a/migration/migration.h b/migration/migration.h index 6af01362d4..714643fe7e 100644 --- a/migration/migration.h +++ b/migration/migration.h @@ -162,13 +162,6 @@ struct MigrationIncomingState { int state; - /* - * The incoming migration coroutine, non-NULL during qemu_loadvm_state(). - * Used to wake the migration incoming coroutine from rdma code. How much is - * it safe - it's a question. - */ - Coroutine *loadvm_co; - /* The coroutine we should enter (back) after failover */ Coroutine *colo_incoming_co; QemuSemaphore colo_incoming_sem; @@ -455,8 +448,6 @@ struct MigrationState { * switchover has been received. */ bool switchover_acked; - /* Is this a rdma migration */ - bool rdma_migration; }; void migrate_set_state(int *state, int old_state, int new_state); diff --git a/migration/options.c b/migration/options.c index 5ab5b6d85d..601cd712b7 100644 --- a/migration/options.c +++ b/migration/options.c @@ -165,7 +165,6 @@ Property migration_properties[] = { /* Migration capabilities */ DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE), - DEFINE_PROP_MIG_CAP("x-rdma-pin-all", MIGRATION_CAPABILITY_RDMA_PIN_ALL), DEFINE_PROP_MIG_CAP("x-auto-converge", MIGRATION_CAPABILITY_AUTO_CONVERGE), DEFINE_PROP_MIG_CAP("x-zero-blocks", MIGRATION_CAPABILITY_ZERO_BLOCKS), DEFINE_PROP_MIG_CAP("x-events", MIGRATION_CAPABILITY_EVENTS), @@ -287,13 +286,6 @@ bool migrate_postcopy_ram(void) return s->capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM]; } -bool migrate_rdma_pin_all(void) -{ - MigrationState *s = migrate_get_current(); - - return s->capabilities[MIGRATION_CAPABILITY_RDMA_PIN_ALL]; -} - bool migrate_release_ram(void) { MigrationState *s = migrate_get_current(); @@ -357,13 +349,6 @@ bool migrate_postcopy(void) return migrate_postcopy_ram() || migrate_dirty_bitmaps(); } -bool migrate_rdma(void) -{ - MigrationState *s = migrate_get_current(); - - return s->rdma_migration; -} - bool migrate_tls(void) { MigrationState *s = migrate_get_current(); @@ -422,7 +407,6 @@ INITIALIZE_MIGRATE_CAPS_SET(check_caps_background_snapshot, MIGRATION_CAPABILITY_PAUSE_BEFORE_SWITCHOVER, MIGRATION_CAPABILITY_AUTO_CONVERGE, MIGRATION_CAPABILITY_RELEASE_RAM, - MIGRATION_CAPABILITY_RDMA_PIN_ALL, MIGRATION_CAPABILITY_XBZRLE, MIGRATION_CAPABILITY_X_COLO, MIGRATION_CAPABILITY_VALIDATE_UUID, diff --git a/migration/options.h b/migration/options.h index 4b21cc2669..cb26708ebf 100644 --- a/migration/options.h +++ b/migration/options.h @@ -35,7 +35,6 @@ bool migrate_multifd(void); bool migrate_pause_before_switchover(void); bool migrate_postcopy_blocktime(void); bool migrate_postcopy_preempt(void); -bool migrate_rdma_pin_all(void); bool migrate_release_ram(void); bool migrate_return_path(void); bool migrate_validate_uuid(void); @@ -52,7 +51,6 @@ bool migrate_zero_copy_send(void); bool migrate_multifd_flush_after_each_section(void); bool migrate_postcopy(void); -bool migrate_rdma(void); bool migrate_tls(void); /* capabilities helpers */ diff --git a/migration/qemu-file.c b/migration/qemu-file.c index b6d2f588bd..09fdfc2b4d 100644 --- a/migration/qemu-file.c +++ b/migration/qemu-file.c @@ -31,7 +31,6 @@ #include "trace.h" #include "options.h" #include "qapi/error.h" -#include "rdma.h" #include "io/channel-file.h" #define IO_BUF_SIZE 32768 diff --git a/migration/ram.c b/migration/ram.c index ceea586b06..6b027c7fd7 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -57,7 +57,6 @@ #include "qemu/iov.h" #include "multifd.h" #include "sysemu/runstate.h" -#include "rdma.h" #include "options.h" #include "sysemu/dirtylimit.h" #include "sysemu/kvm.h" @@ -88,7 +87,6 @@ #define RAM_SAVE_FLAG_EOS 0x10 #define RAM_SAVE_FLAG_CONTINUE 0x20 #define RAM_SAVE_FLAG_XBZRLE 0x40 -/* 0x80 is reserved in rdma.h for RAM_SAVE_FLAG_HOOK */ #define RAM_SAVE_FLAG_MULTIFD_FLUSH 0x200 /* We can't use any flag that is bigger than 0x200 */ @@ -1168,32 +1166,6 @@ static int save_zero_page(RAMState *rs, PageSearchStatus *pss, return len; } -/* - * @pages: the number of pages written by the control path, - * < 0 - error - * > 0 - number of pages written - * - * Return true if the pages has been saved, otherwise false is returned. - */ -static bool control_save_page(PageSearchStatus *pss, - ram_addr_t offset, int *pages) -{ - int ret; - - ret = rdma_control_save_page(pss->pss_channel, pss->block->offset, offset, - TARGET_PAGE_SIZE); - if (ret == RAM_SAVE_CONTROL_NOT_SUPP) { - return false; - } - - if (ret == RAM_SAVE_CONTROL_DELAYED) { - *pages = 1; - return true; - } - *pages = ret; - return true; -} - /* * directly send the page to the stream * @@ -1997,11 +1969,6 @@ int ram_save_queue_pages(const char *rbname, ram_addr_t start, ram_addr_t len, static int ram_save_target_page_legacy(RAMState *rs, PageSearchStatus *pss) { ram_addr_t offset = ((ram_addr_t)pss->page) << TARGET_PAGE_BITS; - int res; - - if (control_save_page(pss, offset, &res)) { - return res; - } if (save_zero_page(rs, pss, offset)) { return 1; @@ -3041,20 +3008,6 @@ static int ram_save_setup(QEMUFile *f, void *opaque, Error **errp) } } - ret = rdma_registration_start(f, RAM_CONTROL_SETUP); - if (ret < 0) { - error_setg(errp, "%s: failed to start RDMA registration", __func__); - qemu_file_set_error(f, ret); - return ret; - } - - ret = rdma_registration_stop(f, RAM_CONTROL_SETUP); - if (ret < 0) { - error_setg(errp, "%s: failed to stop RDMA registration", __func__); - qemu_file_set_error(f, ret); - return ret; - } - migration_ops = g_malloc0(sizeof(MigrationOps)); if (migrate_multifd()) { @@ -3148,12 +3101,6 @@ static int ram_save_iterate(QEMUFile *f, void *opaque) /* Read version before ram_list.blocks */ smp_rmb(); - ret = rdma_registration_start(f, RAM_CONTROL_ROUND); - if (ret < 0) { - qemu_file_set_error(f, ret); - goto out; - } - t0 = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); i = 0; while ((ret = migration_rate_exceeded(f)) == 0 || @@ -3197,16 +3144,6 @@ static int ram_save_iterate(QEMUFile *f, void *opaque) } } - /* - * Must occur before EOS (or any QEMUFile operation) - * because of RDMA protocol. - */ - ret = rdma_registration_stop(f, RAM_CONTROL_ROUND); - if (ret < 0) { - qemu_file_set_error(f, ret); - } - -out: if (ret >= 0 && migration_is_setup_or_active()) { if (migrate_multifd() && migrate_multifd_flush_after_each_section() && @@ -3251,12 +3188,6 @@ static int ram_save_complete(QEMUFile *f, void *opaque) migration_bitmap_sync_precopy(rs, true); } - ret = rdma_registration_start(f, RAM_CONTROL_FINISH); - if (ret < 0) { - qemu_file_set_error(f, ret); - return ret; - } - /* try transferring iterative blocks of memory */ /* flush all remaining blocks regardless of rate limiting */ @@ -3275,12 +3206,6 @@ static int ram_save_complete(QEMUFile *f, void *opaque) } } qemu_mutex_unlock(&rs->bitmap_mutex); - - ret = rdma_registration_stop(f, RAM_CONTROL_FINISH); - if (ret < 0) { - qemu_file_set_error(f, ret); - return ret; - } } ret = multifd_send_sync_main(); @@ -3493,8 +3418,7 @@ static inline void *colo_cache_from_block_offset(RAMBlock *block, /** * ram_handle_zero: handle the zero page case * - * If a page (or a whole RDMA chunk) has been - * determined to be zero, then zap it. + * If a page has been determined to be zero, then zap it. * * @host: host address for the zero page * @ch: what the page is filled from. We only support zero @@ -4071,10 +3995,6 @@ static int parse_ramblock(QEMUFile *f, RAMBlock *block, ram_addr_t length) return -EINVAL; } } - ret = rdma_block_notification_handle(f, block->idstr); - if (ret < 0) { - qemu_file_set_error(f, ret); - } return ret; } @@ -4124,7 +4044,7 @@ static int ram_load_precopy(QEMUFile *f) int flags = 0, ret = 0, invalid_flags = 0, i = 0; if (migrate_mapped_ram()) { - invalid_flags |= (RAM_SAVE_FLAG_HOOK | RAM_SAVE_FLAG_MULTIFD_FLUSH | + invalid_flags |= (RAM_SAVE_FLAG_MULTIFD_FLUSH | RAM_SAVE_FLAG_PAGE | RAM_SAVE_FLAG_XBZRLE | RAM_SAVE_FLAG_ZERO); } @@ -4255,12 +4175,6 @@ static int ram_load_precopy(QEMUFile *f) multifd_recv_sync_main(); } break; - case RAM_SAVE_FLAG_HOOK: - ret = rdma_registration_handle(f); - if (ret < 0) { - qemu_file_set_error(f, ret); - } - break; default: error_report("Unknown combination of migration flags: 0x%x", flags); ret = -EINVAL; diff --git a/migration/rdma.c b/migration/rdma.c deleted file mode 100644 index 855753c671..0000000000 --- a/migration/rdma.c +++ /dev/null @@ -1,4184 +0,0 @@ -/* - * RDMA protocol and interfaces - * - * Copyright IBM, Corp. 2010-2013 - * Copyright Red Hat, Inc. 2015-2016 - * - * Authors: - * Michael R. Hines <mrhines@xxxxxxxxxx> - * Jiuxing Liu <jl@xxxxxxxxxx> - * Daniel P. Berrange <berrange@xxxxxxxxxx> - * - * This work is licensed under the terms of the GNU GPL, version 2 or - * later. See the COPYING file in the top-level directory. - * - */ - -#include "qemu/osdep.h" -#include "qapi/error.h" -#include "qemu/cutils.h" -#include "exec/target_page.h" -#include "rdma.h" -#include "migration.h" -#include "migration-stats.h" -#include "qemu-file.h" -#include "ram.h" -#include "qemu/error-report.h" -#include "qemu/main-loop.h" -#include "qemu/module.h" -#include "qemu/rcu.h" -#include "qemu/sockets.h" -#include "qemu/bitmap.h" -#include "qemu/coroutine.h" -#include "exec/memory.h" -#include <sys/socket.h> -#include <netdb.h> -#include <arpa/inet.h> -#include <rdma/rdma_cma.h> -#include "trace.h" -#include "qom/object.h" -#include "options.h" -#include <poll.h> - -#define RDMA_RESOLVE_TIMEOUT_MS 10000 - -/* Do not merge data if larger than this. */ -#define RDMA_MERGE_MAX (2 * 1024 * 1024) -#define RDMA_SIGNALED_SEND_MAX (RDMA_MERGE_MAX / 4096) - -#define RDMA_REG_CHUNK_SHIFT 20 /* 1 MB */ - -/* - * This is only for non-live state being migrated. - * Instead of RDMA_WRITE messages, we use RDMA_SEND - * messages for that state, which requires a different - * delivery design than main memory. - */ -#define RDMA_SEND_INCREMENT 32768 - -/* - * Maximum size infiniband SEND message - */ -#define RDMA_CONTROL_MAX_BUFFER (512 * 1024) -#define RDMA_CONTROL_MAX_COMMANDS_PER_MESSAGE 4096 - -#define RDMA_CONTROL_VERSION_CURRENT 1 -/* - * Capabilities for negotiation. - */ -#define RDMA_CAPABILITY_PIN_ALL 0x01 - -/* - * Add the other flags above to this list of known capabilities - * as they are introduced. - */ -static uint32_t known_capabilities = RDMA_CAPABILITY_PIN_ALL; - -/* - * A work request ID is 64-bits and we split up these bits - * into 3 parts: - * - * bits 0-15 : type of control message, 2^16 - * bits 16-29: ram block index, 2^14 - * bits 30-63: ram block chunk number, 2^34 - * - * The last two bit ranges are only used for RDMA writes, - * in order to track their completion and potentially - * also track unregistration status of the message. - */ -#define RDMA_WRID_TYPE_SHIFT 0UL -#define RDMA_WRID_BLOCK_SHIFT 16UL -#define RDMA_WRID_CHUNK_SHIFT 30UL - -#define RDMA_WRID_TYPE_MASK \ - ((1UL << RDMA_WRID_BLOCK_SHIFT) - 1UL) - -#define RDMA_WRID_BLOCK_MASK \ - (~RDMA_WRID_TYPE_MASK & ((1UL << RDMA_WRID_CHUNK_SHIFT) - 1UL)) - -#define RDMA_WRID_CHUNK_MASK (~RDMA_WRID_BLOCK_MASK & ~RDMA_WRID_TYPE_MASK) - -/* - * RDMA migration protocol: - * 1. RDMA Writes (data messages, i.e. RAM) - * 2. IB Send/Recv (control channel messages) - */ -enum { - RDMA_WRID_NONE = 0, - RDMA_WRID_RDMA_WRITE = 1, - RDMA_WRID_SEND_CONTROL = 2000, - RDMA_WRID_RECV_CONTROL = 4000, -}; - -/* - * Work request IDs for IB SEND messages only (not RDMA writes). - * This is used by the migration protocol to transmit - * control messages (such as device state and registration commands) - * - * We could use more WRs, but we have enough for now. - */ -enum { - RDMA_WRID_READY = 0, - RDMA_WRID_DATA, - RDMA_WRID_CONTROL, - RDMA_WRID_MAX, -}; - -/* - * SEND/RECV IB Control Messages. - */ -enum { - RDMA_CONTROL_NONE = 0, - RDMA_CONTROL_ERROR, - RDMA_CONTROL_READY, /* ready to receive */ - RDMA_CONTROL_QEMU_FILE, /* QEMUFile-transmitted bytes */ - RDMA_CONTROL_RAM_BLOCKS_REQUEST, /* RAMBlock synchronization */ - RDMA_CONTROL_RAM_BLOCKS_RESULT, /* RAMBlock synchronization */ - RDMA_CONTROL_COMPRESS, /* page contains repeat values */ - RDMA_CONTROL_REGISTER_REQUEST, /* dynamic page registration */ - RDMA_CONTROL_REGISTER_RESULT, /* key to use after registration */ - RDMA_CONTROL_REGISTER_FINISHED, /* current iteration finished */ - RDMA_CONTROL_UNREGISTER_REQUEST, /* dynamic UN-registration */ - RDMA_CONTROL_UNREGISTER_FINISHED, /* unpinning finished */ -}; - - -/* - * Memory and MR structures used to represent an IB Send/Recv work request. - * This is *not* used for RDMA writes, only IB Send/Recv. - */ -typedef struct { - uint8_t control[RDMA_CONTROL_MAX_BUFFER]; /* actual buffer to register */ - struct ibv_mr *control_mr; /* registration metadata */ - size_t control_len; /* length of the message */ - uint8_t *control_curr; /* start of unconsumed bytes */ -} RDMAWorkRequestData; - -/* - * Negotiate RDMA capabilities during connection-setup time. - */ -typedef struct { - uint32_t version; - uint32_t flags; -} RDMACapabilities; - -static void caps_to_network(RDMACapabilities *cap) -{ - cap->version = htonl(cap->version); - cap->flags = htonl(cap->flags); -} - -static void network_to_caps(RDMACapabilities *cap) -{ - cap->version = ntohl(cap->version); - cap->flags = ntohl(cap->flags); -} - -/* - * Representation of a RAMBlock from an RDMA perspective. - * This is not transmitted, only local. - * This and subsequent structures cannot be linked lists - * because we're using a single IB message to transmit - * the information. It's small anyway, so a list is overkill. - */ -typedef struct RDMALocalBlock { - char *block_name; - uint8_t *local_host_addr; /* local virtual address */ - uint64_t remote_host_addr; /* remote virtual address */ - uint64_t offset; - uint64_t length; - struct ibv_mr **pmr; /* MRs for chunk-level registration */ - struct ibv_mr *mr; /* MR for non-chunk-level registration */ - uint32_t *remote_keys; /* rkeys for chunk-level registration */ - uint32_t remote_rkey; /* rkeys for non-chunk-level registration */ - int index; /* which block are we */ - unsigned int src_index; /* (Only used on dest) */ - bool is_ram_block; - int nb_chunks; - unsigned long *transit_bitmap; - unsigned long *unregister_bitmap; -} RDMALocalBlock; - -/* - * Also represents a RAMblock, but only on the dest. - * This gets transmitted by the dest during connection-time - * to the source VM and then is used to populate the - * corresponding RDMALocalBlock with - * the information needed to perform the actual RDMA. - */ -typedef struct QEMU_PACKED RDMADestBlock { - uint64_t remote_host_addr; - uint64_t offset; - uint64_t length; - uint32_t remote_rkey; - uint32_t padding; -} RDMADestBlock; - -static const char *control_desc(unsigned int rdma_control) -{ - static const char *strs[] = { - [RDMA_CONTROL_NONE] = "NONE", - [RDMA_CONTROL_ERROR] = "ERROR", - [RDMA_CONTROL_READY] = "READY", - [RDMA_CONTROL_QEMU_FILE] = "QEMU FILE", - [RDMA_CONTROL_RAM_BLOCKS_REQUEST] = "RAM BLOCKS REQUEST", - [RDMA_CONTROL_RAM_BLOCKS_RESULT] = "RAM BLOCKS RESULT", - [RDMA_CONTROL_COMPRESS] = "COMPRESS", - [RDMA_CONTROL_REGISTER_REQUEST] = "REGISTER REQUEST", - [RDMA_CONTROL_REGISTER_RESULT] = "REGISTER RESULT", - [RDMA_CONTROL_REGISTER_FINISHED] = "REGISTER FINISHED", - [RDMA_CONTROL_UNREGISTER_REQUEST] = "UNREGISTER REQUEST", - [RDMA_CONTROL_UNREGISTER_FINISHED] = "UNREGISTER FINISHED", - }; - - if (rdma_control > RDMA_CONTROL_UNREGISTER_FINISHED) { - return "??BAD CONTROL VALUE??"; - } - - return strs[rdma_control]; -} - -#if !defined(htonll) -static uint64_t htonll(uint64_t v) -{ - union { uint32_t lv[2]; uint64_t llv; } u; - u.lv[0] = htonl(v >> 32); - u.lv[1] = htonl(v & 0xFFFFFFFFULL); - return u.llv; -} -#endif - -#if !defined(ntohll) -static uint64_t ntohll(uint64_t v) -{ - union { uint32_t lv[2]; uint64_t llv; } u; - u.llv = v; - return ((uint64_t)ntohl(u.lv[0]) << 32) | (uint64_t) ntohl(u.lv[1]); -} -#endif - -static void dest_block_to_network(RDMADestBlock *db) -{ - db->remote_host_addr = htonll(db->remote_host_addr); - db->offset = htonll(db->offset); - db->length = htonll(db->length); - db->remote_rkey = htonl(db->remote_rkey); -} - -static void network_to_dest_block(RDMADestBlock *db) -{ - db->remote_host_addr = ntohll(db->remote_host_addr); - db->offset = ntohll(db->offset); - db->length = ntohll(db->length); - db->remote_rkey = ntohl(db->remote_rkey); -} - -/* - * Virtual address of the above structures used for transmitting - * the RAMBlock descriptions at connection-time. - * This structure is *not* transmitted. - */ -typedef struct RDMALocalBlocks { - int nb_blocks; - bool init; /* main memory init complete */ - RDMALocalBlock *block; -} RDMALocalBlocks; - -/* - * Main data structure for RDMA state. - * While there is only one copy of this structure being allocated right now, - * this is the place where one would start if you wanted to consider - * having more than one RDMA connection open at the same time. - */ -typedef struct RDMAContext { - char *host; - int port; - - RDMAWorkRequestData wr_data[RDMA_WRID_MAX]; - - /* - * This is used by *_exchange_send() to figure out whether or not - * the initial "READY" message has already been received or not. - * This is because other functions may potentially poll() and detect - * the READY message before send() does, in which case we need to - * know if it completed. - */ - int control_ready_expected; - - /* number of outstanding writes */ - int nb_sent; - - /* store info about current buffer so that we can - merge it with future sends */ - uint64_t current_addr; - uint64_t current_length; - /* index of ram block the current buffer belongs to */ - int current_index; - /* index of the chunk in the current ram block */ - int current_chunk; - - bool pin_all; - - /* - * infiniband-specific variables for opening the device - * and maintaining connection state and so forth. - * - * cm_id also has ibv_context, rdma_event_channel, and ibv_qp in - * cm_id->verbs, cm_id->channel, and cm_id->qp. - */ - struct rdma_cm_id *cm_id; /* connection manager ID */ - struct rdma_cm_id *listen_id; - bool connected; - - struct ibv_context *verbs; - struct rdma_event_channel *channel; - struct ibv_qp *qp; /* queue pair */ - struct ibv_comp_channel *recv_comp_channel; /* recv completion channel */ - struct ibv_comp_channel *send_comp_channel; /* send completion channel */ - struct ibv_pd *pd; /* protection domain */ - struct ibv_cq *recv_cq; /* recvieve completion queue */ - struct ibv_cq *send_cq; /* send completion queue */ - - /* - * If a previous write failed (perhaps because of a failed - * memory registration, then do not attempt any future work - * and remember the error state. - */ - bool errored; - bool error_reported; - bool received_error; - - /* - * Description of ram blocks used throughout the code. - */ - RDMALocalBlocks local_ram_blocks; - RDMADestBlock *dest_blocks; - - /* Index of the next RAMBlock received during block registration */ - unsigned int next_src_index; - - /* - * Migration on *destination* started. - * Then use coroutine yield function. - * Source runs in a thread, so we don't care. - */ - int migration_started_on_destination; - - int total_registrations; - int total_writes; - - int unregister_current, unregister_next; - uint64_t unregistrations[RDMA_SIGNALED_SEND_MAX]; - - GHashTable *blockmap; - - /* the RDMAContext for return path */ - struct RDMAContext *return_path; - bool is_return_path; -} RDMAContext; - -#define TYPE_QIO_CHANNEL_RDMA "qio-channel-rdma" -OBJECT_DECLARE_SIMPLE_TYPE(QIOChannelRDMA, QIO_CHANNEL_RDMA) - - - -struct QIOChannelRDMA { - QIOChannel parent; - RDMAContext *rdmain; - RDMAContext *rdmaout; - QEMUFile *file; - bool blocking; /* XXX we don't actually honour this yet */ -}; - -/* - * Main structure for IB Send/Recv control messages. - * This gets prepended at the beginning of every Send/Recv. - */ -typedef struct QEMU_PACKED { - uint32_t len; /* Total length of data portion */ - uint32_t type; /* which control command to perform */ - uint32_t repeat; /* number of commands in data portion of same type */ - uint32_t padding; -} RDMAControlHeader; - -static void control_to_network(RDMAControlHeader *control) -{ - control->type = htonl(control->type); - control->len = htonl(control->len); - control->repeat = htonl(control->repeat); -} - -static void network_to_control(RDMAControlHeader *control) -{ - control->type = ntohl(control->type); - control->len = ntohl(control->len); - control->repeat = ntohl(control->repeat); -} - -/* - * Register a single Chunk. - * Information sent by the source VM to inform the dest - * to register an single chunk of memory before we can perform - * the actual RDMA operation. - */ -typedef struct QEMU_PACKED { - union QEMU_PACKED { - uint64_t current_addr; /* offset into the ram_addr_t space */ - uint64_t chunk; /* chunk to lookup if unregistering */ - } key; - uint32_t current_index; /* which ramblock the chunk belongs to */ - uint32_t padding; - uint64_t chunks; /* how many sequential chunks to register */ -} RDMARegister; - -static bool rdma_errored(RDMAContext *rdma) -{ - if (rdma->errored && !rdma->error_reported) { - error_report("RDMA is in an error state waiting migration" - " to abort!"); - rdma->error_reported = true; - } - return rdma->errored; -} - -static void register_to_network(RDMAContext *rdma, RDMARegister *reg) -{ - RDMALocalBlock *local_block; - local_block = &rdma->local_ram_blocks.block[reg->current_index]; - - if (local_block->is_ram_block) { - /* - * current_addr as passed in is an address in the local ram_addr_t - * space, we need to translate this for the destination - */ - reg->key.current_addr -= local_block->offset; - reg->key.current_addr += rdma->dest_blocks[reg->current_index].offset; - } - reg->key.current_addr = htonll(reg->key.current_addr); - reg->current_index = htonl(reg->current_index); - reg->chunks = htonll(reg->chunks); -} - -static void network_to_register(RDMARegister *reg) -{ - reg->key.current_addr = ntohll(reg->key.current_addr); - reg->current_index = ntohl(reg->current_index); - reg->chunks = ntohll(reg->chunks); -} - -typedef struct QEMU_PACKED { - uint32_t value; /* if zero, we will madvise() */ - uint32_t block_idx; /* which ram block index */ - uint64_t offset; /* Address in remote ram_addr_t space */ - uint64_t length; /* length of the chunk */ -} RDMACompress; - -static void compress_to_network(RDMAContext *rdma, RDMACompress *comp) -{ - comp->value = htonl(comp->value); - /* - * comp->offset as passed in is an address in the local ram_addr_t - * space, we need to translate this for the destination - */ - comp->offset -= rdma->local_ram_blocks.block[comp->block_idx].offset; - comp->offset += rdma->dest_blocks[comp->block_idx].offset; - comp->block_idx = htonl(comp->block_idx); - comp->offset = htonll(comp->offset); - comp->length = htonll(comp->length); -} - -static void network_to_compress(RDMACompress *comp) -{ - comp->value = ntohl(comp->value); - comp->block_idx = ntohl(comp->block_idx); - comp->offset = ntohll(comp->offset); - comp->length = ntohll(comp->length); -} - -/* - * The result of the dest's memory registration produces an "rkey" - * which the source VM must reference in order to perform - * the RDMA operation. - */ -typedef struct QEMU_PACKED { - uint32_t rkey; - uint32_t padding; - uint64_t host_addr; -} RDMARegisterResult; - -static void result_to_network(RDMARegisterResult *result) -{ - result->rkey = htonl(result->rkey); - result->host_addr = htonll(result->host_addr); -}; - -static void network_to_result(RDMARegisterResult *result) -{ - result->rkey = ntohl(result->rkey); - result->host_addr = ntohll(result->host_addr); -}; - -static int qemu_rdma_exchange_send(RDMAContext *rdma, RDMAControlHeader *head, - uint8_t *data, RDMAControlHeader *resp, - int *resp_idx, - int (*callback)(RDMAContext *rdma, - Error **errp), - Error **errp); - -static inline uint64_t ram_chunk_index(const uint8_t *start, - const uint8_t *host) -{ - return ((uintptr_t) host - (uintptr_t) start) >> RDMA_REG_CHUNK_SHIFT; -} - -static inline uint8_t *ram_chunk_start(const RDMALocalBlock *rdma_ram_block, - uint64_t i) -{ - return (uint8_t *)(uintptr_t)(rdma_ram_block->local_host_addr + - (i << RDMA_REG_CHUNK_SHIFT)); -} - -static inline uint8_t *ram_chunk_end(const RDMALocalBlock *rdma_ram_block, - uint64_t i) -{ - uint8_t *result = ram_chunk_start(rdma_ram_block, i) + - (1UL << RDMA_REG_CHUNK_SHIFT); - - if (result > (rdma_ram_block->local_host_addr + rdma_ram_block->length)) { - result = rdma_ram_block->local_host_addr + rdma_ram_block->length; - } - - return result; -} - -static void rdma_add_block(RDMAContext *rdma, const char *block_name, - void *host_addr, - ram_addr_t block_offset, uint64_t length) -{ - RDMALocalBlocks *local = &rdma->local_ram_blocks; - RDMALocalBlock *block; - RDMALocalBlock *old = local->block; - - local->block = g_new0(RDMALocalBlock, local->nb_blocks + 1); - - if (local->nb_blocks) { - if (rdma->blockmap) { - for (int x = 0; x < local->nb_blocks; x++) { - g_hash_table_remove(rdma->blockmap, - (void *)(uintptr_t)old[x].offset); - g_hash_table_insert(rdma->blockmap, - (void *)(uintptr_t)old[x].offset, - &local->block[x]); - } - } - memcpy(local->block, old, sizeof(RDMALocalBlock) * local->nb_blocks); - g_free(old); - } - - block = &local->block[local->nb_blocks]; - - block->block_name = g_strdup(block_name); - block->local_host_addr = host_addr; - block->offset = block_offset; - block->length = length; - block->index = local->nb_blocks; - block->src_index = ~0U; /* Filled in by the receipt of the block list */ - block->nb_chunks = ram_chunk_index(host_addr, host_addr + length) + 1UL; - block->transit_bitmap = bitmap_new(block->nb_chunks); - bitmap_clear(block->transit_bitmap, 0, block->nb_chunks); - block->unregister_bitmap = bitmap_new(block->nb_chunks); - bitmap_clear(block->unregister_bitmap, 0, block->nb_chunks); - block->remote_keys = g_new0(uint32_t, block->nb_chunks); - - block->is_ram_block = local->init ? false : true; - - if (rdma->blockmap) { - g_hash_table_insert(rdma->blockmap, (void *)(uintptr_t)block_offset, block); - } - - trace_rdma_add_block(block_name, local->nb_blocks, - (uintptr_t) block->local_host_addr, - block->offset, block->length, - (uintptr_t) (block->local_host_addr + block->length), - BITS_TO_LONGS(block->nb_chunks) * - sizeof(unsigned long) * 8, - block->nb_chunks); - - local->nb_blocks++; -} - -/* - * Memory regions need to be registered with the device and queue pairs setup - * in advanced before the migration starts. This tells us where the RAM blocks - * are so that we can register them individually. - */ -static int qemu_rdma_init_one_block(RAMBlock *rb, void *opaque) -{ - const char *block_name = qemu_ram_get_idstr(rb); - void *host_addr = qemu_ram_get_host_addr(rb); - ram_addr_t block_offset = qemu_ram_get_offset(rb); - ram_addr_t length = qemu_ram_get_used_length(rb); - rdma_add_block(opaque, block_name, host_addr, block_offset, length); - return 0; -} - -/* - * Identify the RAMBlocks and their quantity. They will be references to - * identify chunk boundaries inside each RAMBlock and also be referenced - * during dynamic page registration. - */ -static void qemu_rdma_init_ram_blocks(RDMAContext *rdma) -{ - RDMALocalBlocks *local = &rdma->local_ram_blocks; - int ret; - - assert(rdma->blockmap == NULL); - memset(local, 0, sizeof *local); - ret = foreach_not_ignored_block(qemu_rdma_init_one_block, rdma); - assert(!ret); - trace_qemu_rdma_init_ram_blocks(local->nb_blocks); - rdma->dest_blocks = g_new0(RDMADestBlock, - rdma->local_ram_blocks.nb_blocks); - local->init = true; -} - -/* - * Note: If used outside of cleanup, the caller must ensure that the destination - * block structures are also updated - */ -static void rdma_delete_block(RDMAContext *rdma, RDMALocalBlock *block) -{ - RDMALocalBlocks *local = &rdma->local_ram_blocks; - RDMALocalBlock *old = local->block; - - if (rdma->blockmap) { - g_hash_table_remove(rdma->blockmap, (void *)(uintptr_t)block->offset); - } - if (block->pmr) { - for (int j = 0; j < block->nb_chunks; j++) { - if (!block->pmr[j]) { - continue; - } - ibv_dereg_mr(block->pmr[j]); - rdma->total_registrations--; - } - g_free(block->pmr); - block->pmr = NULL; - } - - if (block->mr) { - ibv_dereg_mr(block->mr); - rdma->total_registrations--; - block->mr = NULL; - } - - g_free(block->transit_bitmap); - block->transit_bitmap = NULL; - - g_free(block->unregister_bitmap); - block->unregister_bitmap = NULL; - - g_free(block->remote_keys); - block->remote_keys = NULL; - - g_free(block->block_name); - block->block_name = NULL; - - if (rdma->blockmap) { - for (int x = 0; x < local->nb_blocks; x++) { - g_hash_table_remove(rdma->blockmap, - (void *)(uintptr_t)old[x].offset); - } - } - - if (local->nb_blocks > 1) { - - local->block = g_new0(RDMALocalBlock, local->nb_blocks - 1); - - if (block->index) { - memcpy(local->block, old, sizeof(RDMALocalBlock) * block->index); - } - - if (block->index < (local->nb_blocks - 1)) { - memcpy(local->block + block->index, old + (block->index + 1), - sizeof(RDMALocalBlock) * - (local->nb_blocks - (block->index + 1))); - for (int x = block->index; x < local->nb_blocks - 1; x++) { - local->block[x].index--; - } - } - } else { - assert(block == local->block); - local->block = NULL; - } - - trace_rdma_delete_block(block, (uintptr_t)block->local_host_addr, - block->offset, block->length, - (uintptr_t)(block->local_host_addr + block->length), - BITS_TO_LONGS(block->nb_chunks) * - sizeof(unsigned long) * 8, block->nb_chunks); - - g_free(old); - - local->nb_blocks--; - - if (local->nb_blocks && rdma->blockmap) { - for (int x = 0; x < local->nb_blocks; x++) { - g_hash_table_insert(rdma->blockmap, - (void *)(uintptr_t)local->block[x].offset, - &local->block[x]); - } - } -} - -/* - * Trace RDMA device open, with device details. - */ -static void qemu_rdma_dump_id(const char *who, struct ibv_context *verbs) -{ - struct ibv_port_attr port; - - if (ibv_query_port(verbs, 1, &port)) { - trace_qemu_rdma_dump_id_failed(who); - return; - } - - trace_qemu_rdma_dump_id(who, - verbs->device->name, - verbs->device->dev_name, - verbs->device->dev_path, - verbs->device->ibdev_path, - port.link_layer, - port.link_layer == IBV_LINK_LAYER_INFINIBAND ? "Infiniband" - : port.link_layer == IBV_LINK_LAYER_ETHERNET ? "Ethernet" - : "Unknown"); -} - -/* - * Trace RDMA gid addressing information. - * Useful for understanding the RDMA device hierarchy in the kernel. - */ -static void qemu_rdma_dump_gid(const char *who, struct rdma_cm_id *id) -{ - char sgid[33]; - char dgid[33]; - inet_ntop(AF_INET6, &id->route.addr.addr.ibaddr.sgid, sgid, sizeof sgid); - inet_ntop(AF_INET6, &id->route.addr.addr.ibaddr.dgid, dgid, sizeof dgid); - trace_qemu_rdma_dump_gid(who, sgid, dgid); -} - -/* - * As of now, IPv6 over RoCE / iWARP is not supported by linux. - * We will try the next addrinfo struct, and fail if there are - * no other valid addresses to bind against. - * - * If user is listening on '[::]', then we will not have a opened a device - * yet and have no way of verifying if the device is RoCE or not. - * - * In this case, the source VM will throw an error for ALL types of - * connections (both IPv4 and IPv6) if the destination machine does not have - * a regular infiniband network available for use. - * - * The only way to guarantee that an error is thrown for broken kernels is - * for the management software to choose a *specific* interface at bind time - * and validate what time of hardware it is. - * - * Unfortunately, this puts the user in a fix: - * - * If the source VM connects with an IPv4 address without knowing that the - * destination has bound to '[::]' the migration will unconditionally fail - * unless the management software is explicitly listening on the IPv4 - * address while using a RoCE-based device. - * - * If the source VM connects with an IPv6 address, then we're OK because we can - * throw an error on the source (and similarly on the destination). - * - * But in mixed environments, this will be broken for a while until it is fixed - * inside linux. - * - * We do provide a *tiny* bit of help in this function: We can list all of the - * devices in the system and check to see if all the devices are RoCE or - * Infiniband. - * - * If we detect that we have a *pure* RoCE environment, then we can safely - * thrown an error even if the management software has specified '[::]' as the - * bind address. - * - * However, if there is are multiple hetergeneous devices, then we cannot make - * this assumption and the user just has to be sure they know what they are - * doing. - * - * Patches are being reviewed on linux-rdma. - */ -static int qemu_rdma_broken_ipv6_kernel(struct ibv_context *verbs, Error **errp) -{ - /* This bug only exists in linux, to our knowledge. */ -#ifdef CONFIG_LINUX - struct ibv_port_attr port_attr; - - /* - * Verbs are only NULL if management has bound to '[::]'. - * - * Let's iterate through all the devices and see if there any pure IB - * devices (non-ethernet). - * - * If not, then we can safely proceed with the migration. - * Otherwise, there are no guarantees until the bug is fixed in linux. - */ - if (!verbs) { - int num_devices; - struct ibv_device **dev_list = ibv_get_device_list(&num_devices); - bool roce_found = false; - bool ib_found = false; - - for (int x = 0; x < num_devices; x++) { - verbs = ibv_open_device(dev_list[x]); - /* - * ibv_open_device() is not documented to set errno. If - * it does, it's somebody else's doc bug. If it doesn't, - * the use of errno below is wrong. - * TODO Find out whether ibv_open_device() sets errno. - */ - if (!verbs) { - if (errno == EPERM) { - continue; - } else { - error_setg_errno(errp, errno, - "could not open RDMA device context"); - return -1; - } - } - - if (ibv_query_port(verbs, 1, &port_attr)) { - ibv_close_device(verbs); - error_setg(errp, - "RDMA ERROR: Could not query initial IB port"); - return -1; - } - - if (port_attr.link_layer == IBV_LINK_LAYER_INFINIBAND) { - ib_found = true; - } else if (port_attr.link_layer == IBV_LINK_LAYER_ETHERNET) { - roce_found = true; - } - - ibv_close_device(verbs); - - } - - if (roce_found) { - if (ib_found) { - warn_report("migrations may fail:" - " IPv6 over RoCE / iWARP in linux" - " is broken. But since you appear to have a" - " mixed RoCE / IB environment, be sure to only" - " migrate over the IB fabric until the kernel " - " fixes the bug."); - } else { - error_setg(errp, "RDMA ERROR: " - "You only have RoCE / iWARP devices in your systems" - " and your management software has specified '[::]'" - ", but IPv6 over RoCE / iWARP is not supported in Linux."); - return -1; - } - } - - return 0; - } - - /* - * If we have a verbs context, that means that some other than '[::]' was - * used by the management software for binding. In which case we can - * actually warn the user about a potentially broken kernel. - */ - - /* IB ports start with 1, not 0 */ - if (ibv_query_port(verbs, 1, &port_attr)) { - error_setg(errp, "RDMA ERROR: Could not query initial IB port"); - return -1; - } - - if (port_attr.link_layer == IBV_LINK_LAYER_ETHERNET) { - error_setg(errp, "RDMA ERROR: " - "Linux kernel's RoCE / iWARP does not support IPv6 " - "(but patches on linux-rdma in progress)"); - return -1; - } - -#endif - - return 0; -} - -/* - * Figure out which RDMA device corresponds to the requested IP hostname - * Also create the initial connection manager identifiers for opening - * the connection. - */ -static int qemu_rdma_resolve_host(RDMAContext *rdma, Error **errp) -{ - Error *err = NULL; - int ret; - struct rdma_addrinfo *res; - char port_str[16]; - struct rdma_cm_event *cm_event; - char ip[40] = "unknown"; - - if (rdma->host == NULL || !strcmp(rdma->host, "")) { - error_setg(errp, "RDMA ERROR: RDMA hostname has not been set"); - return -1; - } - - /* create CM channel */ - rdma->channel = rdma_create_event_channel(); - if (!rdma->channel) { - error_setg(errp, "RDMA ERROR: could not create CM channel"); - return -1; - } - - /* create CM id */ - ret = rdma_create_id(rdma->channel, &rdma->cm_id, NULL, RDMA_PS_TCP); - if (ret < 0) { - error_setg(errp, "RDMA ERROR: could not create channel id"); - goto err_resolve_create_id; - } - - snprintf(port_str, 16, "%d", rdma->port); - port_str[15] = '\0'; - - ret = rdma_getaddrinfo(rdma->host, port_str, NULL, &res); - if (ret) { - error_setg(errp, "RDMA ERROR: could not rdma_getaddrinfo address %s", - rdma->host); - goto err_resolve_get_addr; - } - - /* Try all addresses, saving the first error in @err */ - for (struct rdma_addrinfo *e = res; e != NULL; e = e->ai_next) { - Error **local_errp = err ? NULL : &err; - - inet_ntop(e->ai_family, - &((struct sockaddr_in *) e->ai_dst_addr)->sin_addr, ip, sizeof ip); - trace_qemu_rdma_resolve_host_trying(rdma->host, ip); - - ret = rdma_resolve_addr(rdma->cm_id, NULL, e->ai_dst_addr, - RDMA_RESOLVE_TIMEOUT_MS); - if (ret >= 0) { - if (e->ai_family == AF_INET6) { - ret = qemu_rdma_broken_ipv6_kernel(rdma->cm_id->verbs, - local_errp); - if (ret < 0) { - continue; - } - } - error_free(err); - goto route; - } - } - - rdma_freeaddrinfo(res); - if (err) { - error_propagate(errp, err); - } else { - error_setg(errp, "RDMA ERROR: could not resolve address %s", - rdma->host); - } - goto err_resolve_get_addr; - -route: - rdma_freeaddrinfo(res); - qemu_rdma_dump_gid("source_resolve_addr", rdma->cm_id); - - ret = rdma_get_cm_event(rdma->channel, &cm_event); - if (ret < 0) { - error_setg(errp, "RDMA ERROR: could not perform event_addr_resolved"); - goto err_resolve_get_addr; - } - - if (cm_event->event != RDMA_CM_EVENT_ADDR_RESOLVED) { - error_setg(errp, - "RDMA ERROR: result not equal to event_addr_resolved %s", - rdma_event_str(cm_event->event)); - rdma_ack_cm_event(cm_event); - goto err_resolve_get_addr; - } - rdma_ack_cm_event(cm_event); - - /* resolve route */ - ret = rdma_resolve_route(rdma->cm_id, RDMA_RESOLVE_TIMEOUT_MS); - if (ret < 0) { - error_setg(errp, "RDMA ERROR: could not resolve rdma route"); - goto err_resolve_get_addr; - } - - ret = rdma_get_cm_event(rdma->channel, &cm_event); - if (ret < 0) { - error_setg(errp, "RDMA ERROR: could not perform event_route_resolved"); - goto err_resolve_get_addr; - } - if (cm_event->event != RDMA_CM_EVENT_ROUTE_RESOLVED) { - error_setg(errp, "RDMA ERROR: " - "result not equal to event_route_resolved: %s", - rdma_event_str(cm_event->event)); - rdma_ack_cm_event(cm_event); - goto err_resolve_get_addr; - } - rdma_ack_cm_event(cm_event); - rdma->verbs = rdma->cm_id->verbs; - qemu_rdma_dump_id("source_resolve_host", rdma->cm_id->verbs); - qemu_rdma_dump_gid("source_resolve_host", rdma->cm_id); - return 0; - -err_resolve_get_addr: - rdma_destroy_id(rdma->cm_id); - rdma->cm_id = NULL; -err_resolve_create_id: - rdma_destroy_event_channel(rdma->channel); - rdma->channel = NULL; - return -1; -} - -/* - * Create protection domain and completion queues - */ -static int qemu_rdma_alloc_pd_cq(RDMAContext *rdma, Error **errp) -{ - /* allocate pd */ - rdma->pd = ibv_alloc_pd(rdma->verbs); - if (!rdma->pd) { - error_setg(errp, "failed to allocate protection domain"); - return -1; - } - - /* create receive completion channel */ - rdma->recv_comp_channel = ibv_create_comp_channel(rdma->verbs); - if (!rdma->recv_comp_channel) { - error_setg(errp, "failed to allocate receive completion channel"); - goto err_alloc_pd_cq; - } - - /* - * Completion queue can be filled by read work requests. - */ - rdma->recv_cq = ibv_create_cq(rdma->verbs, (RDMA_SIGNALED_SEND_MAX * 3), - NULL, rdma->recv_comp_channel, 0); - if (!rdma->recv_cq) { - error_setg(errp, "failed to allocate receive completion queue"); - goto err_alloc_pd_cq; - } - - /* create send completion channel */ - rdma->send_comp_channel = ibv_create_comp_channel(rdma->verbs); - if (!rdma->send_comp_channel) { - error_setg(errp, "failed to allocate send completion channel"); - goto err_alloc_pd_cq; - } - - rdma->send_cq = ibv_create_cq(rdma->verbs, (RDMA_SIGNALED_SEND_MAX * 3), - NULL, rdma->send_comp_channel, 0); - if (!rdma->send_cq) { - error_setg(errp, "failed to allocate send completion queue"); - goto err_alloc_pd_cq; - } - - return 0; - -err_alloc_pd_cq: - if (rdma->pd) { - ibv_dealloc_pd(rdma->pd); - } - if (rdma->recv_comp_channel) { - ibv_destroy_comp_channel(rdma->recv_comp_channel); - } - if (rdma->send_comp_channel) { - ibv_destroy_comp_channel(rdma->send_comp_channel); - } - if (rdma->recv_cq) { - ibv_destroy_cq(rdma->recv_cq); - rdma->recv_cq = NULL; - } - rdma->pd = NULL; - rdma->recv_comp_channel = NULL; - rdma->send_comp_channel = NULL; - return -1; - -} - -/* - * Create queue pairs. - */ -static int qemu_rdma_alloc_qp(RDMAContext *rdma) -{ - struct ibv_qp_init_attr attr = { 0 }; - - attr.cap.max_send_wr = RDMA_SIGNALED_SEND_MAX; - attr.cap.max_recv_wr = 3; - attr.cap.max_send_sge = 1; - attr.cap.max_recv_sge = 1; - attr.send_cq = rdma->send_cq; - attr.recv_cq = rdma->recv_cq; - attr.qp_type = IBV_QPT_RC; - - if (rdma_create_qp(rdma->cm_id, rdma->pd, &attr) < 0) { - return -1; - } - - rdma->qp = rdma->cm_id->qp; - return 0; -} - -/* Check whether On-Demand Paging is supported by RDAM device */ -static bool rdma_support_odp(struct ibv_context *dev) -{ - struct ibv_device_attr_ex attr = {0}; - - if (ibv_query_device_ex(dev, NULL, &attr)) { - return false; - } - - if (attr.odp_caps.general_caps & IBV_ODP_SUPPORT) { - return true; - } - - return false; -} - -/* - * ibv_advise_mr to avoid RNR NAK error as far as possible. - * The responder mr registering with ODP will sent RNR NAK back to - * the requester in the face of the page fault. - */ -static void qemu_rdma_advise_prefetch_mr(struct ibv_pd *pd, uint64_t addr, - uint32_t len, uint32_t lkey, - const char *name, bool wr) -{ -#ifdef HAVE_IBV_ADVISE_MR - int ret; - int advice = wr ? IBV_ADVISE_MR_ADVICE_PREFETCH_WRITE : - IBV_ADVISE_MR_ADVICE_PREFETCH; - struct ibv_sge sg_list = {.lkey = lkey, .addr = addr, .length = len}; - - ret = ibv_advise_mr(pd, advice, - IBV_ADVISE_MR_FLAG_FLUSH, &sg_list, 1); - /* ignore the error */ - trace_qemu_rdma_advise_mr(name, len, addr, strerror(ret)); -#endif -} - -static int qemu_rdma_reg_whole_ram_blocks(RDMAContext *rdma, Error **errp) -{ - int i; - RDMALocalBlocks *local = &rdma->local_ram_blocks; - - for (i = 0; i < local->nb_blocks; i++) { - int access = IBV_ACCESS_LOCAL_WRITE | IBV_ACCESS_REMOTE_WRITE; - - local->block[i].mr = - ibv_reg_mr(rdma->pd, - local->block[i].local_host_addr, - local->block[i].length, access - ); - /* - * ibv_reg_mr() is not documented to set errno. If it does, - * it's somebody else's doc bug. If it doesn't, the use of - * errno below is wrong. - * TODO Find out whether ibv_reg_mr() sets errno. - */ - if (!local->block[i].mr && - errno == ENOTSUP && rdma_support_odp(rdma->verbs)) { - access |= IBV_ACCESS_ON_DEMAND; - /* register ODP mr */ - local->block[i].mr = - ibv_reg_mr(rdma->pd, - local->block[i].local_host_addr, - local->block[i].length, access); - trace_qemu_rdma_register_odp_mr(local->block[i].block_name); - - if (local->block[i].mr) { - qemu_rdma_advise_prefetch_mr(rdma->pd, - (uintptr_t)local->block[i].local_host_addr, - local->block[i].length, - local->block[i].mr->lkey, - local->block[i].block_name, - true); - } - } - - if (!local->block[i].mr) { - error_setg_errno(errp, errno, - "Failed to register local dest ram block!"); - goto err; - } - rdma->total_registrations++; - } - - return 0; - -err: - for (i--; i >= 0; i--) { - ibv_dereg_mr(local->block[i].mr); - local->block[i].mr = NULL; - rdma->total_registrations--; - } - - return -1; - -} - -/* - * Find the ram block that corresponds to the page requested to be - * transmitted by QEMU. - * - * Once the block is found, also identify which 'chunk' within that - * block that the page belongs to. - */ -static void qemu_rdma_search_ram_block(RDMAContext *rdma, - uintptr_t block_offset, - uint64_t offset, - uint64_t length, - uint64_t *block_index, - uint64_t *chunk_index) -{ - uint64_t current_addr = block_offset + offset; - RDMALocalBlock *block = g_hash_table_lookup(rdma->blockmap, - (void *) block_offset); - assert(block); - assert(current_addr >= block->offset); - assert((current_addr + length) <= (block->offset + block->length)); - - *block_index = block->index; - *chunk_index = ram_chunk_index(block->local_host_addr, - block->local_host_addr + (current_addr - block->offset)); -} - -/* - * Register a chunk with IB. If the chunk was already registered - * previously, then skip. - * - * Also return the keys associated with the registration needed - * to perform the actual RDMA operation. - */ -static int qemu_rdma_register_and_get_keys(RDMAContext *rdma, - RDMALocalBlock *block, uintptr_t host_addr, - uint32_t *lkey, uint32_t *rkey, int chunk, - uint8_t *chunk_start, uint8_t *chunk_end) -{ - if (block->mr) { - if (lkey) { - *lkey = block->mr->lkey; - } - if (rkey) { - *rkey = block->mr->rkey; - } - return 0; - } - - /* allocate memory to store chunk MRs */ - if (!block->pmr) { - block->pmr = g_new0(struct ibv_mr *, block->nb_chunks); - } - - /* - * If 'rkey', then we're the destination, so grant access to the source. - * - * If 'lkey', then we're the source VM, so grant access only to ourselves. - */ - if (!block->pmr[chunk]) { - uint64_t len = chunk_end - chunk_start; - int access = rkey ? IBV_ACCESS_LOCAL_WRITE | IBV_ACCESS_REMOTE_WRITE : - 0; - - trace_qemu_rdma_register_and_get_keys(len, chunk_start); - - block->pmr[chunk] = ibv_reg_mr(rdma->pd, chunk_start, len, access); - /* - * ibv_reg_mr() is not documented to set errno. If it does, - * it's somebody else's doc bug. If it doesn't, the use of - * errno below is wrong. - * TODO Find out whether ibv_reg_mr() sets errno. - */ - if (!block->pmr[chunk] && - errno == ENOTSUP && rdma_support_odp(rdma->verbs)) { - access |= IBV_ACCESS_ON_DEMAND; - /* register ODP mr */ - block->pmr[chunk] = ibv_reg_mr(rdma->pd, chunk_start, len, access); - trace_qemu_rdma_register_odp_mr(block->block_name); - - if (block->pmr[chunk]) { - qemu_rdma_advise_prefetch_mr(rdma->pd, (uintptr_t)chunk_start, - len, block->pmr[chunk]->lkey, - block->block_name, rkey); - - } - } - } - if (!block->pmr[chunk]) { - return -1; - } - rdma->total_registrations++; - - if (lkey) { - *lkey = block->pmr[chunk]->lkey; - } - if (rkey) { - *rkey = block->pmr[chunk]->rkey; - } - return 0; -} - -/* - * Register (at connection time) the memory used for control - * channel messages. - */ -static int qemu_rdma_reg_control(RDMAContext *rdma, int idx) -{ - rdma->wr_data[idx].control_mr = ibv_reg_mr(rdma->pd, - rdma->wr_data[idx].control, RDMA_CONTROL_MAX_BUFFER, - IBV_ACCESS_LOCAL_WRITE | IBV_ACCESS_REMOTE_WRITE); - if (rdma->wr_data[idx].control_mr) { - rdma->total_registrations++; - return 0; - } - return -1; -} - -/* - * Perform a non-optimized memory unregistration after every transfer - * for demonstration purposes, only if pin-all is not requested. - * - * Potential optimizations: - * 1. Start a new thread to run this function continuously - - for bit clearing - - and for receipt of unregister messages - * 2. Use an LRU. - * 3. Use workload hints. - */ -static int qemu_rdma_unregister_waiting(RDMAContext *rdma) -{ - Error *err = NULL; - - while (rdma->unregistrations[rdma->unregister_current]) { - int ret; - uint64_t wr_id = rdma->unregistrations[rdma->unregister_current]; - uint64_t chunk = - (wr_id & RDMA_WRID_CHUNK_MASK) >> RDMA_WRID_CHUNK_SHIFT; - uint64_t index = - (wr_id & RDMA_WRID_BLOCK_MASK) >> RDMA_WRID_BLOCK_SHIFT; - RDMALocalBlock *block = - &(rdma->local_ram_blocks.block[index]); - RDMARegister reg = { .current_index = index }; - RDMAControlHeader resp = { .type = RDMA_CONTROL_UNREGISTER_FINISHED, - }; - RDMAControlHeader head = { .len = sizeof(RDMARegister), - .type = RDMA_CONTROL_UNREGISTER_REQUEST, - .repeat = 1, - }; - - trace_qemu_rdma_unregister_waiting_proc(chunk, - rdma->unregister_current); - - rdma->unregistrations[rdma->unregister_current] = 0; - rdma->unregister_current++; - - if (rdma->unregister_current == RDMA_SIGNALED_SEND_MAX) { - rdma->unregister_current = 0; - } - - - /* - * Unregistration is speculative (because migration is single-threaded - * and we cannot break the protocol's inifinband message ordering). - * Thus, if the memory is currently being used for transmission, - * then abort the attempt to unregister and try again - * later the next time a completion is received for this memory. - */ - clear_bit(chunk, block->unregister_bitmap); - - if (test_bit(chunk, block->transit_bitmap)) { - trace_qemu_rdma_unregister_waiting_inflight(chunk); - continue; - } - - trace_qemu_rdma_unregister_waiting_send(chunk); - - ret = ibv_dereg_mr(block->pmr[chunk]); - block->pmr[chunk] = NULL; - block->remote_keys[chunk] = 0; - - if (ret != 0) { - error_report("unregistration chunk failed: %s", - strerror(ret)); - return -1; - } - rdma->total_registrations--; - - reg.key.chunk = chunk; - register_to_network(rdma, ®); - ret = qemu_rdma_exchange_send(rdma, &head, (uint8_t *) ®, - &resp, NULL, NULL, &err); - if (ret < 0) { - error_report_err(err); - return -1; - } - - trace_qemu_rdma_unregister_waiting_complete(chunk); - } - - return 0; -} - -static uint64_t qemu_rdma_make_wrid(uint64_t wr_id, uint64_t index, - uint64_t chunk) -{ - uint64_t result = wr_id & RDMA_WRID_TYPE_MASK; - - result |= (index << RDMA_WRID_BLOCK_SHIFT); - result |= (chunk << RDMA_WRID_CHUNK_SHIFT); - - return result; -} - -/* - * Consult the connection manager to see a work request - * (of any kind) has completed. - * Return the work request ID that completed. - */ -static int qemu_rdma_poll(RDMAContext *rdma, struct ibv_cq *cq, - uint64_t *wr_id_out, uint32_t *byte_len) -{ - int ret; - struct ibv_wc wc; - uint64_t wr_id; - - ret = ibv_poll_cq(cq, 1, &wc); - - if (!ret) { - *wr_id_out = RDMA_WRID_NONE; - return 0; - } - - if (ret < 0) { - return -1; - } - - wr_id = wc.wr_id & RDMA_WRID_TYPE_MASK; - - if (wc.status != IBV_WC_SUCCESS) { - return -1; - } - - if (rdma->control_ready_expected && - (wr_id >= RDMA_WRID_RECV_CONTROL)) { - trace_qemu_rdma_poll_recv(wr_id - RDMA_WRID_RECV_CONTROL, wr_id, - rdma->nb_sent); - rdma->control_ready_expected = 0; - } - - if (wr_id == RDMA_WRID_RDMA_WRITE) { - uint64_t chunk = - (wc.wr_id & RDMA_WRID_CHUNK_MASK) >> RDMA_WRID_CHUNK_SHIFT; - uint64_t index = - (wc.wr_id & RDMA_WRID_BLOCK_MASK) >> RDMA_WRID_BLOCK_SHIFT; - RDMALocalBlock *block = &(rdma->local_ram_blocks.block[index]); - - trace_qemu_rdma_poll_write(wr_id, rdma->nb_sent, - index, chunk, block->local_host_addr, - (void *)(uintptr_t)block->remote_host_addr); - - clear_bit(chunk, block->transit_bitmap); - - if (rdma->nb_sent > 0) { - rdma->nb_sent--; - } - } else { - trace_qemu_rdma_poll_other(wr_id, rdma->nb_sent); - } - - *wr_id_out = wc.wr_id; - if (byte_len) { - *byte_len = wc.byte_len; - } - - return 0; -} - -/* Wait for activity on the completion channel. - * Returns 0 on success, none-0 on error. - */ -static int qemu_rdma_wait_comp_channel(RDMAContext *rdma, - struct ibv_comp_channel *comp_channel) -{ - struct rdma_cm_event *cm_event; - - /* - * Coroutine doesn't start until migration_fd_process_incoming() - * so don't yield unless we know we're running inside of a coroutine. - */ - if (rdma->migration_started_on_destination && - migration_incoming_get_current()->state == MIGRATION_STATUS_ACTIVE) { - yield_until_fd_readable(comp_channel->fd); - } else { - /* This is the source side, we're in a separate thread - * or destination prior to migration_fd_process_incoming() - * after postcopy, the destination also in a separate thread. - * we can't yield; so we have to poll the fd. - * But we need to be able to handle 'cancel' or an error - * without hanging forever. - */ - while (!rdma->errored && !rdma->received_error) { - GPollFD pfds[2]; - pfds[0].fd = comp_channel->fd; - pfds[0].events = G_IO_IN | G_IO_HUP | G_IO_ERR; - pfds[0].revents = 0; - - pfds[1].fd = rdma->channel->fd; - pfds[1].events = G_IO_IN | G_IO_HUP | G_IO_ERR; - pfds[1].revents = 0; - - /* 0.1s timeout, should be fine for a 'cancel' */ - switch (qemu_poll_ns(pfds, 2, 100 * 1000 * 1000)) { - case 2: - case 1: /* fd active */ - if (pfds[0].revents) { - return 0; - } - - if (pfds[1].revents) { - if (rdma_get_cm_event(rdma->channel, &cm_event) < 0) { - return -1; - } - - if (cm_event->event == RDMA_CM_EVENT_DISCONNECTED || - cm_event->event == RDMA_CM_EVENT_DEVICE_REMOVAL) { - rdma_ack_cm_event(cm_event); - return -1; - } - rdma_ack_cm_event(cm_event); - } - break; - - case 0: /* Timeout, go around again */ - break; - - default: /* Error of some type - - * I don't trust errno from qemu_poll_ns - */ - return -1; - } - - if (migrate_get_current()->state == MIGRATION_STATUS_CANCELLING) { - /* Bail out and let the cancellation happen */ - return -1; - } - } - } - - if (rdma->received_error) { - return -1; - } - return -rdma->errored; -} - -static struct ibv_comp_channel *to_channel(RDMAContext *rdma, uint64_t wrid) -{ - return wrid < RDMA_WRID_RECV_CONTROL ? rdma->send_comp_channel : - rdma->recv_comp_channel; -} - -static struct ibv_cq *to_cq(RDMAContext *rdma, uint64_t wrid) -{ - return wrid < RDMA_WRID_RECV_CONTROL ? rdma->send_cq : rdma->recv_cq; -} - -/* - * Block until the next work request has completed. - * - * First poll to see if a work request has already completed, - * otherwise block. - * - * If we encounter completed work requests for IDs other than - * the one we're interested in, then that's generally an error. - * - * The only exception is actual RDMA Write completions. These - * completions only need to be recorded, but do not actually - * need further processing. - */ -static int qemu_rdma_block_for_wrid(RDMAContext *rdma, - uint64_t wrid_requested, - uint32_t *byte_len) -{ - int num_cq_events = 0, ret; - struct ibv_cq *cq; - void *cq_ctx; - uint64_t wr_id = RDMA_WRID_NONE, wr_id_in; - struct ibv_comp_channel *ch = to_channel(rdma, wrid_requested); - struct ibv_cq *poll_cq = to_cq(rdma, wrid_requested); - - if (ibv_req_notify_cq(poll_cq, 0)) { - return -1; - } - /* poll cq first */ - while (wr_id != wrid_requested) { - ret = qemu_rdma_poll(rdma, poll_cq, &wr_id_in, byte_len); - if (ret < 0) { - return -1; - } - - wr_id = wr_id_in & RDMA_WRID_TYPE_MASK; - - if (wr_id == RDMA_WRID_NONE) { - break; - } - if (wr_id != wrid_requested) { - trace_qemu_rdma_block_for_wrid_miss(wrid_requested, wr_id); - } - } - - if (wr_id == wrid_requested) { - return 0; - } - - while (1) { - ret = qemu_rdma_wait_comp_channel(rdma, ch); - if (ret < 0) { - goto err_block_for_wrid; - } - - ret = ibv_get_cq_event(ch, &cq, &cq_ctx); - if (ret < 0) { - goto err_block_for_wrid; - } - - num_cq_events++; - - if (ibv_req_notify_cq(cq, 0)) { - goto err_block_for_wrid; - } - - while (wr_id != wrid_requested) { - ret = qemu_rdma_poll(rdma, poll_cq, &wr_id_in, byte_len); - if (ret < 0) { - goto err_block_for_wrid; - } - - wr_id = wr_id_in & RDMA_WRID_TYPE_MASK; - - if (wr_id == RDMA_WRID_NONE) { - break; - } - if (wr_id != wrid_requested) { - trace_qemu_rdma_block_for_wrid_miss(wrid_requested, wr_id); - } - } - - if (wr_id == wrid_requested) { - goto success_block_for_wrid; - } - } - -success_block_for_wrid: - if (num_cq_events) { - ibv_ack_cq_events(cq, num_cq_events); - } - return 0; - -err_block_for_wrid: - if (num_cq_events) { - ibv_ack_cq_events(cq, num_cq_events); - } - - rdma->errored = true; - return -1; -} - -/* - * Post a SEND message work request for the control channel - * containing some data and block until the post completes. - */ -static int qemu_rdma_post_send_control(RDMAContext *rdma, uint8_t *buf, - RDMAControlHeader *head, - Error **errp) -{ - int ret; - RDMAWorkRequestData *wr = &rdma->wr_data[RDMA_WRID_CONTROL]; - struct ibv_send_wr *bad_wr; - struct ibv_sge sge = { - .addr = (uintptr_t)(wr->control), - .length = head->len + sizeof(RDMAControlHeader), - .lkey = wr->control_mr->lkey, - }; - struct ibv_send_wr send_wr = { - .wr_id = RDMA_WRID_SEND_CONTROL, - .opcode = IBV_WR_SEND, - .send_flags = IBV_SEND_SIGNALED, - .sg_list = &sge, - .num_sge = 1, - }; - - trace_qemu_rdma_post_send_control(control_desc(head->type)); - - /* - * We don't actually need to do a memcpy() in here if we used - * the "sge" properly, but since we're only sending control messages - * (not RAM in a performance-critical path), then its OK for now. - * - * The copy makes the RDMAControlHeader simpler to manipulate - * for the time being. - */ - assert(head->len <= RDMA_CONTROL_MAX_BUFFER - sizeof(*head)); - memcpy(wr->control, head, sizeof(RDMAControlHeader)); - control_to_network((void *) wr->control); - - if (buf) { - memcpy(wr->control + sizeof(RDMAControlHeader), buf, head->len); - } - - - ret = ibv_post_send(rdma->qp, &send_wr, &bad_wr); - - if (ret > 0) { - error_setg(errp, "Failed to use post IB SEND for control"); - return -1; - } - - ret = qemu_rdma_block_for_wrid(rdma, RDMA_WRID_SEND_CONTROL, NULL); - if (ret < 0) { - error_setg(errp, "rdma migration: send polling control error"); - return -1; - } - - return 0; -} - -/* - * Post a RECV work request in anticipation of some future receipt - * of data on the control channel. - */ -static int qemu_rdma_post_recv_control(RDMAContext *rdma, int idx, - Error **errp) -{ - struct ibv_recv_wr *bad_wr; - struct ibv_sge sge = { - .addr = (uintptr_t)(rdma->wr_data[idx].control), - .length = RDMA_CONTROL_MAX_BUFFER, - .lkey = rdma->wr_data[idx].control_mr->lkey, - }; - - struct ibv_recv_wr recv_wr = { - .wr_id = RDMA_WRID_RECV_CONTROL + idx, - .sg_list = &sge, - .num_sge = 1, - }; - - - if (ibv_post_recv(rdma->qp, &recv_wr, &bad_wr)) { - error_setg(errp, "error posting control recv"); - return -1; - } - - return 0; -} - -/* - * Block and wait for a RECV control channel message to arrive. - */ -static int qemu_rdma_exchange_get_response(RDMAContext *rdma, - RDMAControlHeader *head, uint32_t expecting, int idx, - Error **errp) -{ - uint32_t byte_len; - int ret = qemu_rdma_block_for_wrid(rdma, RDMA_WRID_RECV_CONTROL + idx, - &byte_len); - - if (ret < 0) { - error_setg(errp, "rdma migration: recv polling control error!"); - return -1; - } - - network_to_control((void *) rdma->wr_data[idx].control); - memcpy(head, rdma->wr_data[idx].control, sizeof(RDMAControlHeader)); - - trace_qemu_rdma_exchange_get_response_start(control_desc(expecting)); - - if (expecting == RDMA_CONTROL_NONE) { - trace_qemu_rdma_exchange_get_response_none(control_desc(head->type), - head->type); - } else if (head->type != expecting || head->type == RDMA_CONTROL_ERROR) { - error_setg(errp, "Was expecting a %s (%d) control message" - ", but got: %s (%d), length: %d", - control_desc(expecting), expecting, - control_desc(head->type), head->type, head->len); - if (head->type == RDMA_CONTROL_ERROR) { - rdma->received_error = true; - } - return -1; - } - if (head->len > RDMA_CONTROL_MAX_BUFFER - sizeof(*head)) { - error_setg(errp, "too long length: %d", head->len); - return -1; - } - if (sizeof(*head) + head->len != byte_len) { - error_setg(errp, "Malformed length: %d byte_len %d", - head->len, byte_len); - return -1; - } - - return 0; -} - -/* - * When a RECV work request has completed, the work request's - * buffer is pointed at the header. - * - * This will advance the pointer to the data portion - * of the control message of the work request's buffer that - * was populated after the work request finished. - */ -static void qemu_rdma_move_header(RDMAContext *rdma, int idx, - RDMAControlHeader *head) -{ - rdma->wr_data[idx].control_len = head->len; - rdma->wr_data[idx].control_curr = - rdma->wr_data[idx].control + sizeof(RDMAControlHeader); -} - -/* - * This is an 'atomic' high-level operation to deliver a single, unified - * control-channel message. - * - * Additionally, if the user is expecting some kind of reply to this message, - * they can request a 'resp' response message be filled in by posting an - * additional work request on behalf of the user and waiting for an additional - * completion. - * - * The extra (optional) response is used during registration to us from having - * to perform an *additional* exchange of message just to provide a response by - * instead piggy-backing on the acknowledgement. - */ -static int qemu_rdma_exchange_send(RDMAContext *rdma, RDMAControlHeader *head, - uint8_t *data, RDMAControlHeader *resp, - int *resp_idx, - int (*callback)(RDMAContext *rdma, - Error **errp), - Error **errp) -{ - int ret; - - /* - * Wait until the dest is ready before attempting to deliver the message - * by waiting for a READY message. - */ - if (rdma->control_ready_expected) { - RDMAControlHeader resp_ignored; - - ret = qemu_rdma_exchange_get_response(rdma, &resp_ignored, - RDMA_CONTROL_READY, - RDMA_WRID_READY, errp); - if (ret < 0) { - return -1; - } - } - - /* - * If the user is expecting a response, post a WR in anticipation of it. - */ - if (resp) { - ret = qemu_rdma_post_recv_control(rdma, RDMA_WRID_DATA, errp); - if (ret < 0) { - return -1; - } - } - - /* - * Post a WR to replace the one we just consumed for the READY message. - */ - ret = qemu_rdma_post_recv_control(rdma, RDMA_WRID_READY, errp); - if (ret < 0) { - return -1; - } - - /* - * Deliver the control message that was requested. - */ - ret = qemu_rdma_post_send_control(rdma, data, head, errp); - - if (ret < 0) { - return -1; - } - - /* - * If we're expecting a response, block and wait for it. - */ - if (resp) { - if (callback) { - trace_qemu_rdma_exchange_send_issue_callback(); - ret = callback(rdma, errp); - if (ret < 0) { - return -1; - } - } - - trace_qemu_rdma_exchange_send_waiting(control_desc(resp->type)); - ret = qemu_rdma_exchange_get_response(rdma, resp, - resp->type, RDMA_WRID_DATA, - errp); - - if (ret < 0) { - return -1; - } - - qemu_rdma_move_header(rdma, RDMA_WRID_DATA, resp); - if (resp_idx) { - *resp_idx = RDMA_WRID_DATA; - } - trace_qemu_rdma_exchange_send_received(control_desc(resp->type)); - } - - rdma->control_ready_expected = 1; - - return 0; -} - -/* - * This is an 'atomic' high-level operation to receive a single, unified - * control-channel message. - */ -static int qemu_rdma_exchange_recv(RDMAContext *rdma, RDMAControlHeader *head, - uint32_t expecting, Error **errp) -{ - RDMAControlHeader ready = { - .len = 0, - .type = RDMA_CONTROL_READY, - .repeat = 1, - }; - int ret; - - /* - * Inform the source that we're ready to receive a message. - */ - ret = qemu_rdma_post_send_control(rdma, NULL, &ready, errp); - - if (ret < 0) { - return -1; - } - - /* - * Block and wait for the message. - */ - ret = qemu_rdma_exchange_get_response(rdma, head, - expecting, RDMA_WRID_READY, errp); - - if (ret < 0) { - return -1; - } - - qemu_rdma_move_header(rdma, RDMA_WRID_READY, head); - - /* - * Post a new RECV work request to replace the one we just consumed. - */ - ret = qemu_rdma_post_recv_control(rdma, RDMA_WRID_READY, errp); - if (ret < 0) { - return -1; - } - - return 0; -} - -/* - * Write an actual chunk of memory using RDMA. - * - * If we're using dynamic registration on the dest-side, we have to - * send a registration command first. - */ -static int qemu_rdma_write_one(RDMAContext *rdma, - int current_index, uint64_t current_addr, - uint64_t length, Error **errp) -{ - struct ibv_sge sge; - struct ibv_send_wr send_wr = { 0 }; - struct ibv_send_wr *bad_wr; - int reg_result_idx, ret, count = 0; - uint64_t chunk, chunks; - uint8_t *chunk_start, *chunk_end; - RDMALocalBlock *block = &(rdma->local_ram_blocks.block[current_index]); - RDMARegister reg; - RDMARegisterResult *reg_result; - RDMAControlHeader resp = { .type = RDMA_CONTROL_REGISTER_RESULT }; - RDMAControlHeader head = { .len = sizeof(RDMARegister), - .type = RDMA_CONTROL_REGISTER_REQUEST, - .repeat = 1, - }; - -retry: - sge.addr = (uintptr_t)(block->local_host_addr + - (current_addr - block->offset)); - sge.length = length; - - chunk = ram_chunk_index(block->local_host_addr, - (uint8_t *)(uintptr_t)sge.addr); - chunk_start = ram_chunk_start(block, chunk); - - if (block->is_ram_block) { - chunks = length / (1UL << RDMA_REG_CHUNK_SHIFT); - - if (chunks && ((length % (1UL << RDMA_REG_CHUNK_SHIFT)) == 0)) { - chunks--; - } - } else { - chunks = block->length / (1UL << RDMA_REG_CHUNK_SHIFT); - - if (chunks && ((block->length % (1UL << RDMA_REG_CHUNK_SHIFT)) == 0)) { - chunks--; - } - } - - trace_qemu_rdma_write_one_top(chunks + 1, - (chunks + 1) * - (1UL << RDMA_REG_CHUNK_SHIFT) / 1024 / 1024); - - chunk_end = ram_chunk_end(block, chunk + chunks); - - - while (test_bit(chunk, block->transit_bitmap)) { - (void)count; - trace_qemu_rdma_write_one_block(count++, current_index, chunk, - sge.addr, length, rdma->nb_sent, block->nb_chunks); - - ret = qemu_rdma_block_for_wrid(rdma, RDMA_WRID_RDMA_WRITE, NULL); - - if (ret < 0) { - error_setg(errp, "Failed to Wait for previous write to complete " - "block %d chunk %" PRIu64 - " current %" PRIu64 " len %" PRIu64 " %d", - current_index, chunk, sge.addr, length, rdma->nb_sent); - return -1; - } - } - - if (!rdma->pin_all || !block->is_ram_block) { - if (!block->remote_keys[chunk]) { - /* - * This chunk has not yet been registered, so first check to see - * if the entire chunk is zero. If so, tell the other size to - * memset() + madvise() the entire chunk without RDMA. - */ - - if (buffer_is_zero((void *)(uintptr_t)sge.addr, length)) { - RDMACompress comp = { - .offset = current_addr, - .value = 0, - .block_idx = current_index, - .length = length, - }; - - head.len = sizeof(comp); - head.type = RDMA_CONTROL_COMPRESS; - - trace_qemu_rdma_write_one_zero(chunk, sge.length, - current_index, current_addr); - - compress_to_network(rdma, &comp); - ret = qemu_rdma_exchange_send(rdma, &head, - (uint8_t *) &comp, NULL, NULL, NULL, errp); - - if (ret < 0) { - return -1; - } - - /* - * TODO: Here we are sending something, but we are not - * accounting for anything transferred. The following is wrong: - * - * stat64_add(&mig_stats.rdma_bytes, sge.length); - * - * because we are using some kind of compression. I - * would think that head.len would be the more similar - * thing to a correct value. - */ - stat64_add(&mig_stats.zero_pages, - sge.length / qemu_target_page_size()); - return 1; - } - - /* - * Otherwise, tell other side to register. - */ - reg.current_index = current_index; - if (block->is_ram_block) { - reg.key.current_addr = current_addr; - } else { - reg.key.chunk = chunk; - } - reg.chunks = chunks; - - trace_qemu_rdma_write_one_sendreg(chunk, sge.length, current_index, - current_addr); - - register_to_network(rdma, ®); - ret = qemu_rdma_exchange_send(rdma, &head, (uint8_t *) ®, - &resp, ®_result_idx, NULL, errp); - if (ret < 0) { - return -1; - } - - /* try to overlap this single registration with the one we sent. */ - if (qemu_rdma_register_and_get_keys(rdma, block, sge.addr, - &sge.lkey, NULL, chunk, - chunk_start, chunk_end)) { - error_setg(errp, "cannot get lkey"); - return -1; - } - - reg_result = (RDMARegisterResult *) - rdma->wr_data[reg_result_idx].control_curr; - - network_to_result(reg_result); - - trace_qemu_rdma_write_one_recvregres(block->remote_keys[chunk], - reg_result->rkey, chunk); - - block->remote_keys[chunk] = reg_result->rkey; - block->remote_host_addr = reg_result->host_addr; - } else { - /* already registered before */ - if (qemu_rdma_register_and_get_keys(rdma, block, sge.addr, - &sge.lkey, NULL, chunk, - chunk_start, chunk_end)) { - error_setg(errp, "cannot get lkey!"); - return -1; - } - } - - send_wr.wr.rdma.rkey = block->remote_keys[chunk]; - } else { - send_wr.wr.rdma.rkey = block->remote_rkey; - - if (qemu_rdma_register_and_get_keys(rdma, block, sge.addr, - &sge.lkey, NULL, chunk, - chunk_start, chunk_end)) { - error_setg(errp, "cannot get lkey!"); - return -1; - } - } - - /* - * Encode the ram block index and chunk within this wrid. - * We will use this information at the time of completion - * to figure out which bitmap to check against and then which - * chunk in the bitmap to look for. - */ - send_wr.wr_id = qemu_rdma_make_wrid(RDMA_WRID_RDMA_WRITE, - current_index, chunk); - - send_wr.opcode = IBV_WR_RDMA_WRITE; - send_wr.send_flags = IBV_SEND_SIGNALED; - send_wr.sg_list = &sge; - send_wr.num_sge = 1; - send_wr.wr.rdma.remote_addr = block->remote_host_addr + - (current_addr - block->offset); - - trace_qemu_rdma_write_one_post(chunk, sge.addr, send_wr.wr.rdma.remote_addr, - sge.length); - - /* - * ibv_post_send() does not return negative error numbers, - * per the specification they are positive - no idea why. - */ - ret = ibv_post_send(rdma->qp, &send_wr, &bad_wr); - - if (ret == ENOMEM) { - trace_qemu_rdma_write_one_queue_full(); - ret = qemu_rdma_block_for_wrid(rdma, RDMA_WRID_RDMA_WRITE, NULL); - if (ret < 0) { - error_setg(errp, "rdma migration: failed to make " - "room in full send queue!"); - return -1; - } - - goto retry; - - } else if (ret > 0) { - error_setg_errno(errp, ret, - "rdma migration: post rdma write failed"); - return -1; - } - - set_bit(chunk, block->transit_bitmap); - stat64_add(&mig_stats.normal_pages, sge.length / qemu_target_page_size()); - /* - * We are adding to transferred the amount of data written, but no - * overhead at all. I will assume that RDMA is magicaly and don't - * need to transfer (at least) the addresses where it wants to - * write the pages. Here it looks like it should be something - * like: - * sizeof(send_wr) + sge.length - * but this being RDMA, who knows. - */ - stat64_add(&mig_stats.rdma_bytes, sge.length); - ram_transferred_add(sge.length); - rdma->total_writes++; - - return 0; -} - -/* - * Push out any unwritten RDMA operations. - * - * We support sending out multiple chunks at the same time. - * Not all of them need to get signaled in the completion queue. - */ -static int qemu_rdma_write_flush(RDMAContext *rdma, Error **errp) -{ - int ret; - - if (!rdma->current_length) { - return 0; - } - - ret = qemu_rdma_write_one(rdma, rdma->current_index, rdma->current_addr, - rdma->current_length, errp); - - if (ret < 0) { - return -1; - } - - if (ret == 0) { - rdma->nb_sent++; - trace_qemu_rdma_write_flush(rdma->nb_sent); - } - - rdma->current_length = 0; - rdma->current_addr = 0; - - return 0; -} - -static inline bool qemu_rdma_buffer_mergeable(RDMAContext *rdma, - uint64_t offset, uint64_t len) -{ - RDMALocalBlock *block; - uint8_t *host_addr; - uint8_t *chunk_end; - - if (rdma->current_index < 0) { - return false; - } - - if (rdma->current_chunk < 0) { - return false; - } - - block = &(rdma->local_ram_blocks.block[rdma->current_index]); - host_addr = block->local_host_addr + (offset - block->offset); - chunk_end = ram_chunk_end(block, rdma->current_chunk); - - if (rdma->current_length == 0) { - return false; - } - - /* - * Only merge into chunk sequentially. - */ - if (offset != (rdma->current_addr + rdma->current_length)) { - return false; - } - - if (offset < block->offset) { - return false; - } - - if ((offset + len) > (block->offset + block->length)) { - return false; - } - - if ((host_addr + len) > chunk_end) { - return false; - } - - return true; -} - -/* - * We're not actually writing here, but doing three things: - * - * 1. Identify the chunk the buffer belongs to. - * 2. If the chunk is full or the buffer doesn't belong to the current - * chunk, then start a new chunk and flush() the old chunk. - * 3. To keep the hardware busy, we also group chunks into batches - * and only require that a batch gets acknowledged in the completion - * queue instead of each individual chunk. - */ -static int qemu_rdma_write(RDMAContext *rdma, - uint64_t block_offset, uint64_t offset, - uint64_t len, Error **errp) -{ - uint64_t current_addr = block_offset + offset; - uint64_t index = rdma->current_index; - uint64_t chunk = rdma->current_chunk; - - /* If we cannot merge it, we flush the current buffer first. */ - if (!qemu_rdma_buffer_mergeable(rdma, current_addr, len)) { - if (qemu_rdma_write_flush(rdma, errp) < 0) { - return -1; - } - rdma->current_length = 0; - rdma->current_addr = current_addr; - - qemu_rdma_search_ram_block(rdma, block_offset, - offset, len, &index, &chunk); - rdma->current_index = index; - rdma->current_chunk = chunk; - } - - /* merge it */ - rdma->current_length += len; - - /* flush it if buffer is too large */ - if (rdma->current_length >= RDMA_MERGE_MAX) { - return qemu_rdma_write_flush(rdma, errp); - } - - return 0; -} - -static void qemu_rdma_cleanup(RDMAContext *rdma) -{ - Error *err = NULL; - - if (rdma->cm_id && rdma->connected) { - if ((rdma->errored || - migrate_get_current()->state == MIGRATION_STATUS_CANCELLING) && - !rdma->received_error) { - RDMAControlHeader head = { .len = 0, - .type = RDMA_CONTROL_ERROR, - .repeat = 1, - }; - warn_report("Early error. Sending error."); - if (qemu_rdma_post_send_control(rdma, NULL, &head, &err) < 0) { - warn_report_err(err); - } - } - - rdma_disconnect(rdma->cm_id); - trace_qemu_rdma_cleanup_disconnect(); - rdma->connected = false; - } - - if (rdma->channel) { - qemu_set_fd_handler(rdma->channel->fd, NULL, NULL, NULL); - } - g_free(rdma->dest_blocks); - rdma->dest_blocks = NULL; - - for (int i = 0; i < RDMA_WRID_MAX; i++) { - if (rdma->wr_data[i].control_mr) { - rdma->total_registrations--; - ibv_dereg_mr(rdma->wr_data[i].control_mr); - } - rdma->wr_data[i].control_mr = NULL; - } - - if (rdma->local_ram_blocks.block) { - while (rdma->local_ram_blocks.nb_blocks) { - rdma_delete_block(rdma, &rdma->local_ram_blocks.block[0]); - } - } - - if (rdma->qp) { - rdma_destroy_qp(rdma->cm_id); - rdma->qp = NULL; - } - if (rdma->recv_cq) { - ibv_destroy_cq(rdma->recv_cq); - rdma->recv_cq = NULL; - } - if (rdma->send_cq) { - ibv_destroy_cq(rdma->send_cq); - rdma->send_cq = NULL; - } - if (rdma->recv_comp_channel) { - ibv_destroy_comp_channel(rdma->recv_comp_channel); - rdma->recv_comp_channel = NULL; - } - if (rdma->send_comp_channel) { - ibv_destroy_comp_channel(rdma->send_comp_channel); - rdma->send_comp_channel = NULL; - } - if (rdma->pd) { - ibv_dealloc_pd(rdma->pd); - rdma->pd = NULL; - } - if (rdma->cm_id) { - rdma_destroy_id(rdma->cm_id); - rdma->cm_id = NULL; - } - - /* the destination side, listen_id and channel is shared */ - if (rdma->listen_id) { - if (!rdma->is_return_path) { - rdma_destroy_id(rdma->listen_id); - } - rdma->listen_id = NULL; - - if (rdma->channel) { - if (!rdma->is_return_path) { - rdma_destroy_event_channel(rdma->channel); - } - rdma->channel = NULL; - } - } - - if (rdma->channel) { - rdma_destroy_event_channel(rdma->channel); - rdma->channel = NULL; - } - g_free(rdma->host); - rdma->host = NULL; -} - - -static int qemu_rdma_source_init(RDMAContext *rdma, bool pin_all, Error **errp) -{ - int ret; - - /* - * Will be validated against destination's actual capabilities - * after the connect() completes. - */ - rdma->pin_all = pin_all; - - ret = qemu_rdma_resolve_host(rdma, errp); - if (ret < 0) { - goto err_rdma_source_init; - } - - ret = qemu_rdma_alloc_pd_cq(rdma, errp); - if (ret < 0) { - goto err_rdma_source_init; - } - - ret = qemu_rdma_alloc_qp(rdma); - if (ret < 0) { - error_setg(errp, "RDMA ERROR: rdma migration: error allocating qp!"); - goto err_rdma_source_init; - } - - qemu_rdma_init_ram_blocks(rdma); - - /* Build the hash that maps from offset to RAMBlock */ - rdma->blockmap = g_hash_table_new(g_direct_hash, g_direct_equal); - for (int i = 0; i < rdma->local_ram_blocks.nb_blocks; i++) { - g_hash_table_insert(rdma->blockmap, - (void *)(uintptr_t)rdma->local_ram_blocks.block[i].offset, - &rdma->local_ram_blocks.block[i]); - } - - for (int i = 0; i < RDMA_WRID_MAX; i++) { - ret = qemu_rdma_reg_control(rdma, i); - if (ret < 0) { - error_setg(errp, "RDMA ERROR: rdma migration: error " - "registering %d control!", i); - goto err_rdma_source_init; - } - } - - return 0; - -err_rdma_source_init: - qemu_rdma_cleanup(rdma); - return -1; -} - -static int qemu_get_cm_event_timeout(RDMAContext *rdma, - struct rdma_cm_event **cm_event, - long msec, Error **errp) -{ - int ret; - struct pollfd poll_fd = { - .fd = rdma->channel->fd, - .events = POLLIN, - .revents = 0 - }; - - do { - ret = poll(&poll_fd, 1, msec); - } while (ret < 0 && errno == EINTR); - - if (ret == 0) { - error_setg(errp, "RDMA ERROR: poll cm event timeout"); - return -1; - } else if (ret < 0) { - error_setg(errp, "RDMA ERROR: failed to poll cm event, errno=%i", - errno); - return -1; - } else if (poll_fd.revents & POLLIN) { - if (rdma_get_cm_event(rdma->channel, cm_event) < 0) { - error_setg(errp, "RDMA ERROR: failed to get cm event"); - return -1; - } - return 0; - } else { - error_setg(errp, "RDMA ERROR: no POLLIN event, revent=%x", - poll_fd.revents); - return -1; - } -} - -static int qemu_rdma_connect(RDMAContext *rdma, bool return_path, - Error **errp) -{ - RDMACapabilities cap = { - .version = RDMA_CONTROL_VERSION_CURRENT, - .flags = 0, - }; - struct rdma_conn_param conn_param = { .initiator_depth = 2, - .retry_count = 5, - .private_data = &cap, - .private_data_len = sizeof(cap), - }; - struct rdma_cm_event *cm_event; - int ret; - - /* - * Only negotiate the capability with destination if the user - * on the source first requested the capability. - */ - if (rdma->pin_all) { - trace_qemu_rdma_connect_pin_all_requested(); - cap.flags |= RDMA_CAPABILITY_PIN_ALL; - } - - caps_to_network(&cap); - - ret = qemu_rdma_post_recv_control(rdma, RDMA_WRID_READY, errp); - if (ret < 0) { - goto err_rdma_source_connect; - } - - ret = rdma_connect(rdma->cm_id, &conn_param); - if (ret < 0) { - error_setg_errno(errp, errno, - "RDMA ERROR: connecting to destination!"); - goto err_rdma_source_connect; - } - - if (return_path) { - ret = qemu_get_cm_event_timeout(rdma, &cm_event, 5000, errp); - } else { - ret = rdma_get_cm_event(rdma->channel, &cm_event); - if (ret < 0) { - error_setg_errno(errp, errno, - "RDMA ERROR: failed to get cm event"); - } - } - if (ret < 0) { - goto err_rdma_source_connect; - } - - if (cm_event->event != RDMA_CM_EVENT_ESTABLISHED) { - error_setg(errp, "RDMA ERROR: connecting to destination!"); - rdma_ack_cm_event(cm_event); - goto err_rdma_source_connect; - } - rdma->connected = true; - - memcpy(&cap, cm_event->param.conn.private_data, sizeof(cap)); - network_to_caps(&cap); - - /* - * Verify that the *requested* capabilities are supported by the destination - * and disable them otherwise. - */ - if (rdma->pin_all && !(cap.flags & RDMA_CAPABILITY_PIN_ALL)) { - warn_report("RDMA: Server cannot support pinning all memory. " - "Will register memory dynamically."); - rdma->pin_all = false; - } - - trace_qemu_rdma_connect_pin_all_outcome(rdma->pin_all); - - rdma_ack_cm_event(cm_event); - - rdma->control_ready_expected = 1; - rdma->nb_sent = 0; - return 0; - -err_rdma_source_connect: - qemu_rdma_cleanup(rdma); - return -1; -} - -static int qemu_rdma_dest_init(RDMAContext *rdma, Error **errp) -{ - Error *err = NULL; - int ret; - struct rdma_cm_id *listen_id; - char ip[40] = "unknown"; - struct rdma_addrinfo *res, *e; - char port_str[16]; - int reuse = 1; - - for (int i = 0; i < RDMA_WRID_MAX; i++) { - rdma->wr_data[i].control_len = 0; - rdma->wr_data[i].control_curr = NULL; - } - - if (!rdma->host || !rdma->host[0]) { - error_setg(errp, "RDMA ERROR: RDMA host is not set!"); - rdma->errored = true; - return -1; - } - /* create CM channel */ - rdma->channel = rdma_create_event_channel(); - if (!rdma->channel) { - error_setg(errp, "RDMA ERROR: could not create rdma event channel"); - rdma->errored = true; - return -1; - } - - /* create CM id */ - ret = rdma_create_id(rdma->channel, &listen_id, NULL, RDMA_PS_TCP); - if (ret < 0) { - error_setg(errp, "RDMA ERROR: could not create cm_id!"); - goto err_dest_init_create_listen_id; - } - - snprintf(port_str, 16, "%d", rdma->port); - port_str[15] = '\0'; - - ret = rdma_getaddrinfo(rdma->host, port_str, NULL, &res); - if (ret) { - error_setg(errp, "RDMA ERROR: could not rdma_getaddrinfo address %s", - rdma->host); - goto err_dest_init_bind_addr; - } - - ret = rdma_set_option(listen_id, RDMA_OPTION_ID, RDMA_OPTION_ID_REUSEADDR, - &reuse, sizeof reuse); - if (ret < 0) { - error_setg(errp, "RDMA ERROR: Error: could not set REUSEADDR option"); - goto err_dest_init_bind_addr; - } - - /* Try all addresses, saving the first error in @err */ - for (e = res; e != NULL; e = e->ai_next) { - Error **local_errp = err ? NULL : &err; - - inet_ntop(e->ai_family, - &((struct sockaddr_in *) e->ai_dst_addr)->sin_addr, ip, sizeof ip); - trace_qemu_rdma_dest_init_trying(rdma->host, ip); - ret = rdma_bind_addr(listen_id, e->ai_dst_addr); - if (ret < 0) { - continue; - } - if (e->ai_family == AF_INET6) { - ret = qemu_rdma_broken_ipv6_kernel(listen_id->verbs, - local_errp); - if (ret < 0) { - continue; - } - } - error_free(err); - break; - } - - rdma_freeaddrinfo(res); - if (!e) { - if (err) { - error_propagate(errp, err); - } else { - error_setg(errp, "RDMA ERROR: Error: could not rdma_bind_addr!"); - } - goto err_dest_init_bind_addr; - } - - rdma->listen_id = listen_id; - qemu_rdma_dump_gid("dest_init", listen_id); - return 0; - -err_dest_init_bind_addr: - rdma_destroy_id(listen_id); -err_dest_init_create_listen_id: - rdma_destroy_event_channel(rdma->channel); - rdma->channel = NULL; - rdma->errored = true; - return -1; - -} - -static void qemu_rdma_return_path_dest_init(RDMAContext *rdma_return_path, - RDMAContext *rdma) -{ - for (int i = 0; i < RDMA_WRID_MAX; i++) { - rdma_return_path->wr_data[i].control_len = 0; - rdma_return_path->wr_data[i].control_curr = NULL; - } - - /*the CM channel and CM id is shared*/ - rdma_return_path->channel = rdma->channel; - rdma_return_path->listen_id = rdma->listen_id; - - rdma->return_path = rdma_return_path; - rdma_return_path->return_path = rdma; - rdma_return_path->is_return_path = true; -} - -static RDMAContext *qemu_rdma_data_init(InetSocketAddress *saddr, Error **errp) -{ - RDMAContext *rdma = NULL; - - rdma = g_new0(RDMAContext, 1); - rdma->current_index = -1; - rdma->current_chunk = -1; - - rdma->host = g_strdup(saddr->host); - rdma->port = atoi(saddr->port); - return rdma; -} - -/* - * QEMUFile interface to the control channel. - * SEND messages for control only. - * VM's ram is handled with regular RDMA messages. - */ -static ssize_t qio_channel_rdma_writev(QIOChannel *ioc, - const struct iovec *iov, - size_t niov, - int *fds, - size_t nfds, - int flags, - Error **errp) -{ - QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc); - RDMAContext *rdma; - int ret; - ssize_t done = 0; - size_t len; - - RCU_READ_LOCK_GUARD(); - rdma = qatomic_rcu_read(&rioc->rdmaout); - - if (!rdma) { - error_setg(errp, "RDMA control channel output is not set"); - return -1; - } - - if (rdma->errored) { - error_setg(errp, - "RDMA is in an error state waiting migration to abort!"); - return -1; - } - - /* - * Push out any writes that - * we're queued up for VM's ram. - */ - ret = qemu_rdma_write_flush(rdma, errp); - if (ret < 0) { - rdma->errored = true; - return -1; - } - - for (int i = 0; i < niov; i++) { - size_t remaining = iov[i].iov_len; - uint8_t * data = (void *)iov[i].iov_base; - while (remaining) { - RDMAControlHeader head = {}; - - len = MIN(remaining, RDMA_SEND_INCREMENT); - remaining -= len; - - head.len = len; - head.type = RDMA_CONTROL_QEMU_FILE; - - ret = qemu_rdma_exchange_send(rdma, &head, - data, NULL, NULL, NULL, errp); - - if (ret < 0) { - rdma->errored = true; - return -1; - } - - data += len; - done += len; - } - } - - return done; -} - -static size_t qemu_rdma_fill(RDMAContext *rdma, uint8_t *buf, - size_t size, int idx) -{ - size_t len = 0; - - if (rdma->wr_data[idx].control_len) { - trace_qemu_rdma_fill(rdma->wr_data[idx].control_len, size); - - len = MIN(size, rdma->wr_data[idx].control_len); - memcpy(buf, rdma->wr_data[idx].control_curr, len); - rdma->wr_data[idx].control_curr += len; - rdma->wr_data[idx].control_len -= len; - } - - return len; -} - -/* - * QEMUFile interface to the control channel. - * RDMA links don't use bytestreams, so we have to - * return bytes to QEMUFile opportunistically. - */ -static ssize_t qio_channel_rdma_readv(QIOChannel *ioc, - const struct iovec *iov, - size_t niov, - int **fds, - size_t *nfds, - int flags, - Error **errp) -{ - QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc); - RDMAContext *rdma; - RDMAControlHeader head; - int ret; - ssize_t done = 0; - size_t len; - - RCU_READ_LOCK_GUARD(); - rdma = qatomic_rcu_read(&rioc->rdmain); - - if (!rdma) { - error_setg(errp, "RDMA control channel input is not set"); - return -1; - } - - if (rdma->errored) { - error_setg(errp, - "RDMA is in an error state waiting migration to abort!"); - return -1; - } - - for (int i = 0; i < niov; i++) { - size_t want = iov[i].iov_len; - uint8_t *data = (void *)iov[i].iov_base; - - /* - * First, we hold on to the last SEND message we - * were given and dish out the bytes until we run - * out of bytes. - */ - len = qemu_rdma_fill(rdma, data, want, 0); - done += len; - want -= len; - /* Got what we needed, so go to next iovec */ - if (want == 0) { - continue; - } - - /* If we got any data so far, then don't wait - * for more, just return what we have */ - if (done > 0) { - break; - } - - - /* We've got nothing at all, so lets wait for - * more to arrive - */ - ret = qemu_rdma_exchange_recv(rdma, &head, RDMA_CONTROL_QEMU_FILE, - errp); - - if (ret < 0) { - rdma->errored = true; - return -1; - } - - /* - * SEND was received with new bytes, now try again. - */ - len = qemu_rdma_fill(rdma, data, want, 0); - done += len; - want -= len; - - /* Still didn't get enough, so lets just return */ - if (want) { - if (done == 0) { - return QIO_CHANNEL_ERR_BLOCK; - } else { - break; - } - } - } - return done; -} - -/* - * Block until all the outstanding chunks have been delivered by the hardware. - */ -static int qemu_rdma_drain_cq(RDMAContext *rdma) -{ - Error *err = NULL; - - if (qemu_rdma_write_flush(rdma, &err) < 0) { - error_report_err(err); - return -1; - } - - while (rdma->nb_sent) { - if (qemu_rdma_block_for_wrid(rdma, RDMA_WRID_RDMA_WRITE, NULL) < 0) { - error_report("rdma migration: complete polling error!"); - return -1; - } - } - - qemu_rdma_unregister_waiting(rdma); - - return 0; -} - - -static int qio_channel_rdma_set_blocking(QIOChannel *ioc, - bool blocking, - Error **errp) -{ - QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc); - /* XXX we should make readv/writev actually honour this :-) */ - rioc->blocking = blocking; - return 0; -} - - -typedef struct QIOChannelRDMASource QIOChannelRDMASource; -struct QIOChannelRDMASource { - GSource parent; - QIOChannelRDMA *rioc; - GIOCondition condition; -}; - -static gboolean -qio_channel_rdma_source_prepare(GSource *source, - gint *timeout) -{ - QIOChannelRDMASource *rsource = (QIOChannelRDMASource *)source; - RDMAContext *rdma; - GIOCondition cond = 0; - *timeout = -1; - - RCU_READ_LOCK_GUARD(); - if (rsource->condition == G_IO_IN) { - rdma = qatomic_rcu_read(&rsource->rioc->rdmain); - } else { - rdma = qatomic_rcu_read(&rsource->rioc->rdmaout); - } - - if (!rdma) { - error_report("RDMAContext is NULL when prepare Gsource"); - return FALSE; - } - - if (rdma->wr_data[0].control_len) { - cond |= G_IO_IN; - } - cond |= G_IO_OUT; - - return cond & rsource->condition; -} - -static gboolean -qio_channel_rdma_source_check(GSource *source) -{ - QIOChannelRDMASource *rsource = (QIOChannelRDMASource *)source; - RDMAContext *rdma; - GIOCondition cond = 0; - - RCU_READ_LOCK_GUARD(); - if (rsource->condition == G_IO_IN) { - rdma = qatomic_rcu_read(&rsource->rioc->rdmain); - } else { - rdma = qatomic_rcu_read(&rsource->rioc->rdmaout); - } - - if (!rdma) { - error_report("RDMAContext is NULL when check Gsource"); - return FALSE; - } - - if (rdma->wr_data[0].control_len) { - cond |= G_IO_IN; - } - cond |= G_IO_OUT; - - return cond & rsource->condition; -} - -static gboolean -qio_channel_rdma_source_dispatch(GSource *source, - GSourceFunc callback, - gpointer user_data) -{ - QIOChannelFunc func = (QIOChannelFunc)callback; - QIOChannelRDMASource *rsource = (QIOChannelRDMASource *)source; - RDMAContext *rdma; - GIOCondition cond = 0; - - RCU_READ_LOCK_GUARD(); - if (rsource->condition == G_IO_IN) { - rdma = qatomic_rcu_read(&rsource->rioc->rdmain); - } else { - rdma = qatomic_rcu_read(&rsource->rioc->rdmaout); - } - - if (!rdma) { - error_report("RDMAContext is NULL when dispatch Gsource"); - return FALSE; - } - - if (rdma->wr_data[0].control_len) { - cond |= G_IO_IN; - } - cond |= G_IO_OUT; - - return (*func)(QIO_CHANNEL(rsource->rioc), - (cond & rsource->condition), - user_data); -} - -static void -qio_channel_rdma_source_finalize(GSource *source) -{ - QIOChannelRDMASource *ssource = (QIOChannelRDMASource *)source; - - object_unref(OBJECT(ssource->rioc)); -} - -static GSourceFuncs qio_channel_rdma_source_funcs = { - qio_channel_rdma_source_prepare, - qio_channel_rdma_source_check, - qio_channel_rdma_source_dispatch, - qio_channel_rdma_source_finalize -}; - -static GSource *qio_channel_rdma_create_watch(QIOChannel *ioc, - GIOCondition condition) -{ - QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc); - QIOChannelRDMASource *ssource; - GSource *source; - - source = g_source_new(&qio_channel_rdma_source_funcs, - sizeof(QIOChannelRDMASource)); - ssource = (QIOChannelRDMASource *)source; - - ssource->rioc = rioc; - object_ref(OBJECT(rioc)); - - ssource->condition = condition; - - return source; -} - -static void qio_channel_rdma_set_aio_fd_handler(QIOChannel *ioc, - AioContext *read_ctx, - IOHandler *io_read, - AioContext *write_ctx, - IOHandler *io_write, - void *opaque) -{ - QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc); - if (io_read) { - aio_set_fd_handler(read_ctx, rioc->rdmain->recv_comp_channel->fd, - io_read, io_write, NULL, NULL, opaque); - aio_set_fd_handler(read_ctx, rioc->rdmain->send_comp_channel->fd, - io_read, io_write, NULL, NULL, opaque); - } else { - aio_set_fd_handler(write_ctx, rioc->rdmaout->recv_comp_channel->fd, - io_read, io_write, NULL, NULL, opaque); - aio_set_fd_handler(write_ctx, rioc->rdmaout->send_comp_channel->fd, - io_read, io_write, NULL, NULL, opaque); - } -} - -struct rdma_close_rcu { - struct rcu_head rcu; - RDMAContext *rdmain; - RDMAContext *rdmaout; -}; - -/* callback from qio_channel_rdma_close via call_rcu */ -static void qio_channel_rdma_close_rcu(struct rdma_close_rcu *rcu) -{ - if (rcu->rdmain) { - qemu_rdma_cleanup(rcu->rdmain); - } - - if (rcu->rdmaout) { - qemu_rdma_cleanup(rcu->rdmaout); - } - - g_free(rcu->rdmain); - g_free(rcu->rdmaout); - g_free(rcu); -} - -static int qio_channel_rdma_close(QIOChannel *ioc, - Error **errp) -{ - QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc); - RDMAContext *rdmain, *rdmaout; - struct rdma_close_rcu *rcu = g_new(struct rdma_close_rcu, 1); - - trace_qemu_rdma_close(); - - rdmain = rioc->rdmain; - if (rdmain) { - qatomic_rcu_set(&rioc->rdmain, NULL); - } - - rdmaout = rioc->rdmaout; - if (rdmaout) { - qatomic_rcu_set(&rioc->rdmaout, NULL); - } - - rcu->rdmain = rdmain; - rcu->rdmaout = rdmaout; - call_rcu(rcu, qio_channel_rdma_close_rcu, rcu); - - return 0; -} - -static int -qio_channel_rdma_shutdown(QIOChannel *ioc, - QIOChannelShutdown how, - Error **errp) -{ - QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc); - RDMAContext *rdmain, *rdmaout; - - RCU_READ_LOCK_GUARD(); - - rdmain = qatomic_rcu_read(&rioc->rdmain); - rdmaout = qatomic_rcu_read(&rioc->rdmain); - - switch (how) { - case QIO_CHANNEL_SHUTDOWN_READ: - if (rdmain) { - rdmain->errored = true; - } - break; - case QIO_CHANNEL_SHUTDOWN_WRITE: - if (rdmaout) { - rdmaout->errored = true; - } - break; - case QIO_CHANNEL_SHUTDOWN_BOTH: - default: - if (rdmain) { - rdmain->errored = true; - } - if (rdmaout) { - rdmaout->errored = true; - } - break; - } - - return 0; -} - -/* - * Parameters: - * @offset == 0 : - * This means that 'block_offset' is a full virtual address that does not - * belong to a RAMBlock of the virtual machine and instead - * represents a private malloc'd memory area that the caller wishes to - * transfer. - * - * @offset != 0 : - * Offset is an offset to be added to block_offset and used - * to also lookup the corresponding RAMBlock. - * - * @size : Number of bytes to transfer - * - * @pages_sent : User-specificed pointer to indicate how many pages were - * sent. Usually, this will not be more than a few bytes of - * the protocol because most transfers are sent asynchronously. - */ -static int qemu_rdma_save_page(QEMUFile *f, ram_addr_t block_offset, - ram_addr_t offset, size_t size) -{ - QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(qemu_file_get_ioc(f)); - Error *err = NULL; - RDMAContext *rdma; - int ret; - - RCU_READ_LOCK_GUARD(); - rdma = qatomic_rcu_read(&rioc->rdmaout); - - if (!rdma) { - return -1; - } - - if (rdma_errored(rdma)) { - return -1; - } - - qemu_fflush(f); - - /* - * Add this page to the current 'chunk'. If the chunk - * is full, or the page doesn't belong to the current chunk, - * an actual RDMA write will occur and a new chunk will be formed. - */ - ret = qemu_rdma_write(rdma, block_offset, offset, size, &err); - if (ret < 0) { - error_report_err(err); - goto err; - } - - /* - * Drain the Completion Queue if possible, but do not block, - * just poll. - * - * If nothing to poll, the end of the iteration will do this - * again to make sure we don't overflow the request queue. - */ - while (1) { - uint64_t wr_id, wr_id_in; - ret = qemu_rdma_poll(rdma, rdma->recv_cq, &wr_id_in, NULL); - - if (ret < 0) { - error_report("rdma migration: polling error"); - goto err; - } - - wr_id = wr_id_in & RDMA_WRID_TYPE_MASK; - - if (wr_id == RDMA_WRID_NONE) { - break; - } - } - - while (1) { - uint64_t wr_id, wr_id_in; - ret = qemu_rdma_poll(rdma, rdma->send_cq, &wr_id_in, NULL); - - if (ret < 0) { - error_report("rdma migration: polling error"); - goto err; - } - - wr_id = wr_id_in & RDMA_WRID_TYPE_MASK; - - if (wr_id == RDMA_WRID_NONE) { - break; - } - } - - return RAM_SAVE_CONTROL_DELAYED; - -err: - rdma->errored = true; - return -1; -} - -int rdma_control_save_page(QEMUFile *f, ram_addr_t block_offset, - ram_addr_t offset, size_t size) -{ - if (!migrate_rdma() || migration_in_postcopy()) { - return RAM_SAVE_CONTROL_NOT_SUPP; - } - - int ret = qemu_rdma_save_page(f, block_offset, offset, size); - - if (ret != RAM_SAVE_CONTROL_DELAYED && - ret != RAM_SAVE_CONTROL_NOT_SUPP) { - if (ret < 0) { - qemu_file_set_error(f, ret); - } - } - return ret; -} - -static void rdma_accept_incoming_migration(void *opaque); - -static void rdma_cm_poll_handler(void *opaque) -{ - RDMAContext *rdma = opaque; - struct rdma_cm_event *cm_event; - MigrationIncomingState *mis = migration_incoming_get_current(); - - if (rdma_get_cm_event(rdma->channel, &cm_event) < 0) { - error_report("get_cm_event failed %d", errno); - return; - } - - if (cm_event->event == RDMA_CM_EVENT_DISCONNECTED || - cm_event->event == RDMA_CM_EVENT_DEVICE_REMOVAL) { - if (!rdma->errored && - migration_incoming_get_current()->state != - MIGRATION_STATUS_COMPLETED) { - error_report("receive cm event, cm event is %d", cm_event->event); - rdma->errored = true; - if (rdma->return_path) { - rdma->return_path->errored = true; - } - } - rdma_ack_cm_event(cm_event); - if (mis->loadvm_co) { - qemu_coroutine_enter(mis->loadvm_co); - } - return; - } - rdma_ack_cm_event(cm_event); -} - -static int qemu_rdma_accept(RDMAContext *rdma) -{ - Error *err = NULL; - RDMACapabilities cap; - struct rdma_conn_param conn_param = { - .responder_resources = 2, - .private_data = &cap, - .private_data_len = sizeof(cap), - }; - RDMAContext *rdma_return_path = NULL; - g_autoptr(InetSocketAddress) isock = g_new0(InetSocketAddress, 1); - struct rdma_cm_event *cm_event; - struct ibv_context *verbs; - int ret; - - ret = rdma_get_cm_event(rdma->channel, &cm_event); - if (ret < 0) { - goto err_rdma_dest_wait; - } - - if (cm_event->event != RDMA_CM_EVENT_CONNECT_REQUEST) { - rdma_ack_cm_event(cm_event); - goto err_rdma_dest_wait; - } - - isock->host = g_strdup(rdma->host); - isock->port = g_strdup_printf("%d", rdma->port); - - /* - * initialize the RDMAContext for return path for postcopy after first - * connection request reached. - */ - if ((migrate_postcopy() || migrate_return_path()) - && !rdma->is_return_path) { - rdma_return_path = qemu_rdma_data_init(isock, NULL); - if (rdma_return_path == NULL) { - rdma_ack_cm_event(cm_event); - goto err_rdma_dest_wait; - } - - qemu_rdma_return_path_dest_init(rdma_return_path, rdma); - } - - memcpy(&cap, cm_event->param.conn.private_data, sizeof(cap)); - - network_to_caps(&cap); - - if (cap.version < 1 || cap.version > RDMA_CONTROL_VERSION_CURRENT) { - error_report("Unknown source RDMA version: %d, bailing...", - cap.version); - rdma_ack_cm_event(cm_event); - goto err_rdma_dest_wait; - } - - /* - * Respond with only the capabilities this version of QEMU knows about. - */ - cap.flags &= known_capabilities; - - /* - * Enable the ones that we do know about. - * Add other checks here as new ones are introduced. - */ - if (cap.flags & RDMA_CAPABILITY_PIN_ALL) { - rdma->pin_all = true; - } - - rdma->cm_id = cm_event->id; - verbs = cm_event->id->verbs; - - rdma_ack_cm_event(cm_event); - - trace_qemu_rdma_accept_pin_state(rdma->pin_all); - - caps_to_network(&cap); - - trace_qemu_rdma_accept_pin_verbsc(verbs); - - if (!rdma->verbs) { - rdma->verbs = verbs; - } else if (rdma->verbs != verbs) { - error_report("ibv context not matching %p, %p!", rdma->verbs, - verbs); - goto err_rdma_dest_wait; - } - - qemu_rdma_dump_id("dest_init", verbs); - - ret = qemu_rdma_alloc_pd_cq(rdma, &err); - if (ret < 0) { - error_report_err(err); - goto err_rdma_dest_wait; - } - - ret = qemu_rdma_alloc_qp(rdma); - if (ret < 0) { - error_report("rdma migration: error allocating qp!"); - goto err_rdma_dest_wait; - } - - qemu_rdma_init_ram_blocks(rdma); - - for (int i = 0; i < RDMA_WRID_MAX; i++) { - ret = qemu_rdma_reg_control(rdma, i); - if (ret < 0) { - error_report("rdma: error registering %d control", i); - goto err_rdma_dest_wait; - } - } - - /* Accept the second connection request for return path */ - if ((migrate_postcopy() || migrate_return_path()) - && !rdma->is_return_path) { - qemu_set_fd_handler(rdma->channel->fd, rdma_accept_incoming_migration, - NULL, - (void *)(intptr_t)rdma->return_path); - } else { - qemu_set_fd_handler(rdma->channel->fd, rdma_cm_poll_handler, - NULL, rdma); - } - - ret = rdma_accept(rdma->cm_id, &conn_param); - if (ret < 0) { - error_report("rdma_accept failed"); - goto err_rdma_dest_wait; - } - - ret = rdma_get_cm_event(rdma->channel, &cm_event); - if (ret < 0) { - error_report("rdma_accept get_cm_event failed"); - goto err_rdma_dest_wait; - } - - if (cm_event->event != RDMA_CM_EVENT_ESTABLISHED) { - error_report("rdma_accept not event established"); - rdma_ack_cm_event(cm_event); - goto err_rdma_dest_wait; - } - - rdma_ack_cm_event(cm_event); - rdma->connected = true; - - ret = qemu_rdma_post_recv_control(rdma, RDMA_WRID_READY, &err); - if (ret < 0) { - error_report_err(err); - goto err_rdma_dest_wait; - } - - qemu_rdma_dump_gid("dest_connect", rdma->cm_id); - - return 0; - -err_rdma_dest_wait: - rdma->errored = true; - qemu_rdma_cleanup(rdma); - g_free(rdma_return_path); - return -1; -} - -static int dest_ram_sort_func(const void *a, const void *b) -{ - unsigned int a_index = ((const RDMALocalBlock *)a)->src_index; - unsigned int b_index = ((const RDMALocalBlock *)b)->src_index; - - return (a_index < b_index) ? -1 : (a_index != b_index); -} - -/* - * During each iteration of the migration, we listen for instructions - * by the source VM to perform dynamic page registrations before they - * can perform RDMA operations. - * - * We respond with the 'rkey'. - * - * Keep doing this until the source tells us to stop. - */ -int rdma_registration_handle(QEMUFile *f) -{ - RDMAControlHeader reg_resp = { .len = sizeof(RDMARegisterResult), - .type = RDMA_CONTROL_REGISTER_RESULT, - .repeat = 0, - }; - RDMAControlHeader unreg_resp = { .len = 0, - .type = RDMA_CONTROL_UNREGISTER_FINISHED, - .repeat = 0, - }; - RDMAControlHeader blocks = { .type = RDMA_CONTROL_RAM_BLOCKS_RESULT, - .repeat = 1 }; - QIOChannelRDMA *rioc; - Error *err = NULL; - RDMAContext *rdma; - RDMALocalBlocks *local; - RDMAControlHeader head; - RDMARegister *reg, *registers; - RDMACompress *comp; - RDMARegisterResult *reg_result; - static RDMARegisterResult results[RDMA_CONTROL_MAX_COMMANDS_PER_MESSAGE]; - RDMALocalBlock *block; - void *host_addr; - int ret; - int idx = 0; - - if (!migrate_rdma()) { - return 0; - } - - RCU_READ_LOCK_GUARD(); - rioc = QIO_CHANNEL_RDMA(qemu_file_get_ioc(f)); - rdma = qatomic_rcu_read(&rioc->rdmain); - - if (!rdma) { - return -1; - } - - if (rdma_errored(rdma)) { - return -1; - } - - local = &rdma->local_ram_blocks; - do { - trace_rdma_registration_handle_wait(); - - ret = qemu_rdma_exchange_recv(rdma, &head, RDMA_CONTROL_NONE, &err); - - if (ret < 0) { - error_report_err(err); - break; - } - - if (head.repeat > RDMA_CONTROL_MAX_COMMANDS_PER_MESSAGE) { - error_report("rdma: Too many requests in this message (%d)." - "Bailing.", head.repeat); - break; - } - - switch (head.type) { - case RDMA_CONTROL_COMPRESS: - comp = (RDMACompress *) rdma->wr_data[idx].control_curr; - network_to_compress(comp); - - trace_rdma_registration_handle_compress(comp->length, - comp->block_idx, - comp->offset); - if (comp->block_idx >= rdma->local_ram_blocks.nb_blocks) { - error_report("rdma: 'compress' bad block index %u (vs %d)", - (unsigned int)comp->block_idx, - rdma->local_ram_blocks.nb_blocks); - goto err; - } - block = &(rdma->local_ram_blocks.block[comp->block_idx]); - - host_addr = block->local_host_addr + - (comp->offset - block->offset); - if (comp->value) { - error_report("rdma: Zero page with non-zero (%d) value", - comp->value); - goto err; - } - ram_handle_zero(host_addr, comp->length); - break; - - case RDMA_CONTROL_REGISTER_FINISHED: - trace_rdma_registration_handle_finished(); - return 0; - - case RDMA_CONTROL_RAM_BLOCKS_REQUEST: - trace_rdma_registration_handle_ram_blocks(); - - /* Sort our local RAM Block list so it's the same as the source, - * we can do this since we've filled in a src_index in the list - * as we received the RAMBlock list earlier. - */ - qsort(rdma->local_ram_blocks.block, - rdma->local_ram_blocks.nb_blocks, - sizeof(RDMALocalBlock), dest_ram_sort_func); - for (int i = 0; i < local->nb_blocks; i++) { - local->block[i].index = i; - } - - if (rdma->pin_all) { - ret = qemu_rdma_reg_whole_ram_blocks(rdma, &err); - if (ret < 0) { - error_report_err(err); - goto err; - } - } - - /* - * Dest uses this to prepare to transmit the RAMBlock descriptions - * to the source VM after connection setup. - * Both sides use the "remote" structure to communicate and update - * their "local" descriptions with what was sent. - */ - for (int i = 0; i < local->nb_blocks; i++) { - rdma->dest_blocks[i].remote_host_addr = - (uintptr_t)(local->block[i].local_host_addr); - - if (rdma->pin_all) { - rdma->dest_blocks[i].remote_rkey = local->block[i].mr->rkey; - } - - rdma->dest_blocks[i].offset = local->block[i].offset; - rdma->dest_blocks[i].length = local->block[i].length; - - dest_block_to_network(&rdma->dest_blocks[i]); - trace_rdma_registration_handle_ram_blocks_loop( - local->block[i].block_name, - local->block[i].offset, - local->block[i].length, - local->block[i].local_host_addr, - local->block[i].src_index); - } - - blocks.len = rdma->local_ram_blocks.nb_blocks - * sizeof(RDMADestBlock); - - - ret = qemu_rdma_post_send_control(rdma, - (uint8_t *) rdma->dest_blocks, &blocks, - &err); - - if (ret < 0) { - error_report_err(err); - goto err; - } - - break; - case RDMA_CONTROL_REGISTER_REQUEST: - trace_rdma_registration_handle_register(head.repeat); - - reg_resp.repeat = head.repeat; - registers = (RDMARegister *) rdma->wr_data[idx].control_curr; - - for (int count = 0; count < head.repeat; count++) { - uint64_t chunk; - uint8_t *chunk_start, *chunk_end; - - reg = ®isters[count]; - network_to_register(reg); - - reg_result = &results[count]; - - trace_rdma_registration_handle_register_loop(count, - reg->current_index, reg->key.current_addr, reg->chunks); - - if (reg->current_index >= rdma->local_ram_blocks.nb_blocks) { - error_report("rdma: 'register' bad block index %u (vs %d)", - (unsigned int)reg->current_index, - rdma->local_ram_blocks.nb_blocks); - goto err; - } - block = &(rdma->local_ram_blocks.block[reg->current_index]); - if (block->is_ram_block) { - if (block->offset > reg->key.current_addr) { - error_report("rdma: bad register address for block %s" - " offset: %" PRIx64 " current_addr: %" PRIx64, - block->block_name, block->offset, - reg->key.current_addr); - goto err; - } - host_addr = (block->local_host_addr + - (reg->key.current_addr - block->offset)); - chunk = ram_chunk_index(block->local_host_addr, - (uint8_t *) host_addr); - } else { - chunk = reg->key.chunk; - host_addr = block->local_host_addr + - (reg->key.chunk * (1UL << RDMA_REG_CHUNK_SHIFT)); - /* Check for particularly bad chunk value */ - if (host_addr < (void *)block->local_host_addr) { - error_report("rdma: bad chunk for block %s" - " chunk: %" PRIx64, - block->block_name, reg->key.chunk); - goto err; - } - } - chunk_start = ram_chunk_start(block, chunk); - chunk_end = ram_chunk_end(block, chunk + reg->chunks); - /* avoid "-Waddress-of-packed-member" warning */ - uint32_t tmp_rkey = 0; - if (qemu_rdma_register_and_get_keys(rdma, block, - (uintptr_t)host_addr, NULL, &tmp_rkey, - chunk, chunk_start, chunk_end)) { - error_report("cannot get rkey"); - goto err; - } - reg_result->rkey = tmp_rkey; - - reg_result->host_addr = (uintptr_t)block->local_host_addr; - - trace_rdma_registration_handle_register_rkey(reg_result->rkey); - - result_to_network(reg_result); - } - - ret = qemu_rdma_post_send_control(rdma, - (uint8_t *) results, ®_resp, &err); - - if (ret < 0) { - error_report_err(err); - goto err; - } - break; - case RDMA_CONTROL_UNREGISTER_REQUEST: - trace_rdma_registration_handle_unregister(head.repeat); - unreg_resp.repeat = head.repeat; - registers = (RDMARegister *) rdma->wr_data[idx].control_curr; - - for (int count = 0; count < head.repeat; count++) { - reg = ®isters[count]; - network_to_register(reg); - - trace_rdma_registration_handle_unregister_loop(count, - reg->current_index, reg->key.chunk); - - block = &(rdma->local_ram_blocks.block[reg->current_index]); - - ret = ibv_dereg_mr(block->pmr[reg->key.chunk]); - block->pmr[reg->key.chunk] = NULL; - - if (ret != 0) { - error_report("rdma unregistration chunk failed: %s", - strerror(errno)); - goto err; - } - - rdma->total_registrations--; - - trace_rdma_registration_handle_unregister_success(reg->key.chunk); - } - - ret = qemu_rdma_post_send_control(rdma, NULL, &unreg_resp, &err); - - if (ret < 0) { - error_report_err(err); - goto err; - } - break; - case RDMA_CONTROL_REGISTER_RESULT: - error_report("Invalid RESULT message at dest."); - goto err; - default: - error_report("Unknown control message %s", control_desc(head.type)); - goto err; - } - } while (1); - -err: - rdma->errored = true; - return -1; -} - -/* Destination: - * Called during the initial RAM load section which lists the - * RAMBlocks by name. This lets us know the order of the RAMBlocks on - * the source. We've already built our local RAMBlock list, but not - * yet sent the list to the source. - */ -int rdma_block_notification_handle(QEMUFile *f, const char *name) -{ - int curr; - int found = -1; - - if (!migrate_rdma()) { - return 0; - } - - RCU_READ_LOCK_GUARD(); - QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(qemu_file_get_ioc(f)); - RDMAContext *rdma = qatomic_rcu_read(&rioc->rdmain); - - if (!rdma) { - return -1; - } - - /* Find the matching RAMBlock in our local list */ - for (curr = 0; curr < rdma->local_ram_blocks.nb_blocks; curr++) { - if (!strcmp(rdma->local_ram_blocks.block[curr].block_name, name)) { - found = curr; - break; - } - } - - if (found == -1) { - error_report("RAMBlock '%s' not found on destination", name); - return -1; - } - - rdma->local_ram_blocks.block[curr].src_index = rdma->next_src_index; - trace_rdma_block_notification_handle(name, rdma->next_src_index); - rdma->next_src_index++; - - return 0; -} - -int rdma_registration_start(QEMUFile *f, uint64_t flags) -{ - if (!migrate_rdma() || migration_in_postcopy()) { - return 0; - } - - QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(qemu_file_get_ioc(f)); - RCU_READ_LOCK_GUARD(); - RDMAContext *rdma = qatomic_rcu_read(&rioc->rdmaout); - if (!rdma) { - return -1; - } - - if (rdma_errored(rdma)) { - return -1; - } - - trace_rdma_registration_start(flags); - qemu_put_be64(f, RAM_SAVE_FLAG_HOOK); - return qemu_fflush(f); -} - -/* - * Inform dest that dynamic registrations are done for now. - * First, flush writes, if any. - */ -int rdma_registration_stop(QEMUFile *f, uint64_t flags) -{ - QIOChannelRDMA *rioc; - Error *err = NULL; - RDMAContext *rdma; - RDMAControlHeader head = { .len = 0, .repeat = 1 }; - int ret; - - if (!migrate_rdma() || migration_in_postcopy()) { - return 0; - } - - RCU_READ_LOCK_GUARD(); - rioc = QIO_CHANNEL_RDMA(qemu_file_get_ioc(f)); - rdma = qatomic_rcu_read(&rioc->rdmaout); - if (!rdma) { - return -1; - } - - if (rdma_errored(rdma)) { - return -1; - } - - qemu_fflush(f); - ret = qemu_rdma_drain_cq(rdma); - - if (ret < 0) { - goto err; - } - - if (flags == RAM_CONTROL_SETUP) { - RDMAControlHeader resp = {.type = RDMA_CONTROL_RAM_BLOCKS_RESULT }; - RDMALocalBlocks *local = &rdma->local_ram_blocks; - int reg_result_idx, nb_dest_blocks; - - head.type = RDMA_CONTROL_RAM_BLOCKS_REQUEST; - trace_rdma_registration_stop_ram(); - - /* - * Make sure that we parallelize the pinning on both sides. - * For very large guests, doing this serially takes a really - * long time, so we have to 'interleave' the pinning locally - * with the control messages by performing the pinning on this - * side before we receive the control response from the other - * side that the pinning has completed. - */ - ret = qemu_rdma_exchange_send(rdma, &head, NULL, &resp, - ®_result_idx, rdma->pin_all ? - qemu_rdma_reg_whole_ram_blocks : NULL, - &err); - if (ret < 0) { - error_report_err(err); - return -1; - } - - nb_dest_blocks = resp.len / sizeof(RDMADestBlock); - - /* - * The protocol uses two different sets of rkeys (mutually exclusive): - * 1. One key to represent the virtual address of the entire ram block. - * (dynamic chunk registration disabled - pin everything with one rkey.) - * 2. One to represent individual chunks within a ram block. - * (dynamic chunk registration enabled - pin individual chunks.) - * - * Once the capability is successfully negotiated, the destination transmits - * the keys to use (or sends them later) including the virtual addresses - * and then propagates the remote ram block descriptions to his local copy. - */ - - if (local->nb_blocks != nb_dest_blocks) { - error_report("ram blocks mismatch (Number of blocks %d vs %d)", - local->nb_blocks, nb_dest_blocks); - error_printf("Your QEMU command line parameters are probably " - "not identical on both the source and destination."); - rdma->errored = true; - return -1; - } - - qemu_rdma_move_header(rdma, reg_result_idx, &resp); - memcpy(rdma->dest_blocks, - rdma->wr_data[reg_result_idx].control_curr, resp.len); - for (int i = 0; i < nb_dest_blocks; i++) { - network_to_dest_block(&rdma->dest_blocks[i]); - - /* We require that the blocks are in the same order */ - if (rdma->dest_blocks[i].length != local->block[i].length) { - error_report("Block %s/%d has a different length %" PRIu64 - "vs %" PRIu64, - local->block[i].block_name, i, - local->block[i].length, - rdma->dest_blocks[i].length); - rdma->errored = true; - return -1; - } - local->block[i].remote_host_addr = - rdma->dest_blocks[i].remote_host_addr; - local->block[i].remote_rkey = rdma->dest_blocks[i].remote_rkey; - } - } - - trace_rdma_registration_stop(flags); - - head.type = RDMA_CONTROL_REGISTER_FINISHED; - ret = qemu_rdma_exchange_send(rdma, &head, NULL, NULL, NULL, NULL, &err); - - if (ret < 0) { - error_report_err(err); - goto err; - } - - return 0; -err: - rdma->errored = true; - return -1; -} - -static void qio_channel_rdma_finalize(Object *obj) -{ - QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(obj); - if (rioc->rdmain) { - qemu_rdma_cleanup(rioc->rdmain); - g_free(rioc->rdmain); - rioc->rdmain = NULL; - } - if (rioc->rdmaout) { - qemu_rdma_cleanup(rioc->rdmaout); - g_free(rioc->rdmaout); - rioc->rdmaout = NULL; - } -} - -static void qio_channel_rdma_class_init(ObjectClass *klass, - void *class_data G_GNUC_UNUSED) -{ - QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass); - - ioc_klass->io_writev = qio_channel_rdma_writev; - ioc_klass->io_readv = qio_channel_rdma_readv; - ioc_klass->io_set_blocking = qio_channel_rdma_set_blocking; - ioc_klass->io_close = qio_channel_rdma_close; - ioc_klass->io_create_watch = qio_channel_rdma_create_watch; - ioc_klass->io_set_aio_fd_handler = qio_channel_rdma_set_aio_fd_handler; - ioc_klass->io_shutdown = qio_channel_rdma_shutdown; -} - -static const TypeInfo qio_channel_rdma_info = { - .parent = TYPE_QIO_CHANNEL, - .name = TYPE_QIO_CHANNEL_RDMA, - .instance_size = sizeof(QIOChannelRDMA), - .instance_finalize = qio_channel_rdma_finalize, - .class_init = qio_channel_rdma_class_init, -}; - -static void qio_channel_rdma_register_types(void) -{ - type_register_static(&qio_channel_rdma_info); -} - -type_init(qio_channel_rdma_register_types); - -static QEMUFile *rdma_new_input(RDMAContext *rdma) -{ - QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(object_new(TYPE_QIO_CHANNEL_RDMA)); - - rioc->file = qemu_file_new_input(QIO_CHANNEL(rioc)); - rioc->rdmain = rdma; - rioc->rdmaout = rdma->return_path; - - return rioc->file; -} - -static QEMUFile *rdma_new_output(RDMAContext *rdma) -{ - QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(object_new(TYPE_QIO_CHANNEL_RDMA)); - - rioc->file = qemu_file_new_output(QIO_CHANNEL(rioc)); - rioc->rdmaout = rdma; - rioc->rdmain = rdma->return_path; - - return rioc->file; -} - -static void rdma_accept_incoming_migration(void *opaque) -{ - RDMAContext *rdma = opaque; - QEMUFile *f; - - trace_qemu_rdma_accept_incoming_migration(); - if (qemu_rdma_accept(rdma) < 0) { - error_report("RDMA ERROR: Migration initialization failed"); - return; - } - - trace_qemu_rdma_accept_incoming_migration_accepted(); - - if (rdma->is_return_path) { - return; - } - - f = rdma_new_input(rdma); - if (f == NULL) { - error_report("RDMA ERROR: could not open RDMA for input"); - qemu_rdma_cleanup(rdma); - return; - } - - rdma->migration_started_on_destination = 1; - migration_fd_process_incoming(f); -} - -void rdma_start_incoming_migration(InetSocketAddress *host_port, - Error **errp) -{ - MigrationState *s = migrate_get_current(); - int ret; - RDMAContext *rdma; - - trace_rdma_start_incoming_migration(); - - /* Avoid ram_block_discard_disable(), cannot change during migration. */ - if (ram_block_discard_is_required()) { - error_setg(errp, "RDMA: cannot disable RAM discard"); - return; - } - - rdma = qemu_rdma_data_init(host_port, errp); - if (rdma == NULL) { - goto err; - } - - ret = qemu_rdma_dest_init(rdma, errp); - if (ret < 0) { - goto err; - } - - trace_rdma_start_incoming_migration_after_dest_init(); - - ret = rdma_listen(rdma->listen_id, 5); - - if (ret < 0) { - error_setg(errp, "RDMA ERROR: listening on socket!"); - goto cleanup_rdma; - } - - trace_rdma_start_incoming_migration_after_rdma_listen(); - s->rdma_migration = true; - qemu_set_fd_handler(rdma->channel->fd, rdma_accept_incoming_migration, - NULL, (void *)(intptr_t)rdma); - return; - -cleanup_rdma: - qemu_rdma_cleanup(rdma); -err: - if (rdma) { - g_free(rdma->host); - } - g_free(rdma); -} - -void rdma_start_outgoing_migration(void *opaque, - InetSocketAddress *host_port, Error **errp) -{ - MigrationState *s = opaque; - RDMAContext *rdma_return_path = NULL; - RDMAContext *rdma; - int ret; - - /* Avoid ram_block_discard_disable(), cannot change during migration. */ - if (ram_block_discard_is_required()) { - error_setg(errp, "RDMA: cannot disable RAM discard"); - return; - } - - rdma = qemu_rdma_data_init(host_port, errp); - if (rdma == NULL) { - goto err; - } - - ret = qemu_rdma_source_init(rdma, migrate_rdma_pin_all(), errp); - - if (ret < 0) { - goto err; - } - - trace_rdma_start_outgoing_migration_after_rdma_source_init(); - ret = qemu_rdma_connect(rdma, false, errp); - - if (ret < 0) { - goto err; - } - - /* RDMA postcopy need a separate queue pair for return path */ - if (migrate_postcopy() || migrate_return_path()) { - rdma_return_path = qemu_rdma_data_init(host_port, errp); - - if (rdma_return_path == NULL) { - goto return_path_err; - } - - ret = qemu_rdma_source_init(rdma_return_path, - migrate_rdma_pin_all(), errp); - - if (ret < 0) { - goto return_path_err; - } - - ret = qemu_rdma_connect(rdma_return_path, true, errp); - - if (ret < 0) { - goto return_path_err; - } - - rdma->return_path = rdma_return_path; - rdma_return_path->return_path = rdma; - rdma_return_path->is_return_path = true; - } - - trace_rdma_start_outgoing_migration_after_rdma_connect(); - - s->to_dst_file = rdma_new_output(rdma); - s->rdma_migration = true; - migrate_fd_connect(s, NULL); - return; -return_path_err: - qemu_rdma_cleanup(rdma); -err: - g_free(rdma); - g_free(rdma_return_path); -} diff --git a/migration/rdma.h b/migration/rdma.h deleted file mode 100644 index a8d27f33b8..0000000000 --- a/migration/rdma.h +++ /dev/null @@ -1,69 +0,0 @@ -/* - * RDMA protocol and interfaces - * - * Copyright IBM, Corp. 2010-2013 - * Copyright Red Hat, Inc. 2015-2016 - * - * Authors: - * Michael R. Hines <mrhines@xxxxxxxxxx> - * Jiuxing Liu <jl@xxxxxxxxxx> - * Daniel P. Berrange <berrange@xxxxxxxxxx> - * - * This work is licensed under the terms of the GNU GPL, version 2 or - * later. See the COPYING file in the top-level directory. - * - */ - -#include "qemu/sockets.h" - -#ifndef QEMU_MIGRATION_RDMA_H -#define QEMU_MIGRATION_RDMA_H - -#include "exec/memory.h" - -void rdma_start_outgoing_migration(void *opaque, InetSocketAddress *host_port, - Error **errp); - -void rdma_start_incoming_migration(InetSocketAddress *host_port, Error **errp); - -/* - * Constants used by rdma return codes - */ -#define RAM_CONTROL_SETUP 0 -#define RAM_CONTROL_ROUND 1 -#define RAM_CONTROL_FINISH 3 - -/* - * Whenever this is found in the data stream, the flags - * will be passed to rdma functions in the incoming-migration - * side. - */ -#define RAM_SAVE_FLAG_HOOK 0x80 - -#define RAM_SAVE_CONTROL_NOT_SUPP -1000 -#define RAM_SAVE_CONTROL_DELAYED -2000 - -#ifdef CONFIG_RDMA -int rdma_registration_handle(QEMUFile *f); -int rdma_registration_start(QEMUFile *f, uint64_t flags); -int rdma_registration_stop(QEMUFile *f, uint64_t flags); -int rdma_block_notification_handle(QEMUFile *f, const char *name); -int rdma_control_save_page(QEMUFile *f, ram_addr_t block_offset, - ram_addr_t offset, size_t size); -#else -static inline -int rdma_registration_handle(QEMUFile *f) { return 0; } -static inline -int rdma_registration_start(QEMUFile *f, uint64_t flags) { return 0; } -static inline -int rdma_registration_stop(QEMUFile *f, uint64_t flags) { return 0; } -static inline -int rdma_block_notification_handle(QEMUFile *f, const char *name) { return 0; } -static inline -int rdma_control_save_page(QEMUFile *f, ram_addr_t block_offset, - ram_addr_t offset, size_t size) -{ - return RAM_SAVE_CONTROL_NOT_SUPP; -} -#endif -#endif diff --git a/migration/savevm.c b/migration/savevm.c index c621f2359b..3941d65693 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -2996,7 +2996,7 @@ int qemu_loadvm_state(QEMUFile *f) /* We've got to be careful; if we don't read the data and just shut the fd * then the sender can error if we close while it's still sending. - * We also mustn't read data that isn't there; some transports (RDMA) + * We also mustn't read data that isn't there; some transports * will stall waiting for that data when the source has already closed. */ if (ret == 0 && should_send_vmdesc()) { diff --git a/migration/trace-events b/migration/trace-events index 0b7c3324fb..72e0517f09 100644 --- a/migration/trace-events +++ b/migration/trace-events @@ -193,7 +193,7 @@ process_incoming_migration_co_postcopy_end_main(void) "" postcopy_preempt_enabled(bool value) "%d" # migration-stats -migration_transferred_bytes(uint64_t qemu_file, uint64_t multifd, uint64_t rdma) "qemu_file %" PRIu64 " multifd %" PRIu64 " RDMA %" PRIu64 +migration_transferred_bytes(uint64_t qemu_file, uint64_t multifd) "qemu_file %" PRIu64 " multifd %" PRIu64 # channel.c migration_set_incoming_channel(void *ioc, const char *ioctype) "ioc=%p ioctype=%s" @@ -204,72 +204,6 @@ migrate_state_too_big(void) "" migrate_global_state_post_load(const char *state) "loaded state: %s" migrate_global_state_pre_save(const char *state) "saved state: %s" -# rdma.c -qemu_rdma_accept_incoming_migration(void) "" -qemu_rdma_accept_incoming_migration_accepted(void) "" -qemu_rdma_accept_pin_state(bool pin) "%d" -qemu_rdma_accept_pin_verbsc(void *verbs) "Verbs context after listen: %p" -qemu_rdma_block_for_wrid_miss(uint64_t wcomp, uint64_t req) "A Wanted wrid %" PRIu64 " but got %" PRIu64 -qemu_rdma_cleanup_disconnect(void) "" -qemu_rdma_close(void) "" -qemu_rdma_connect_pin_all_requested(void) "" -qemu_rdma_connect_pin_all_outcome(bool pin) "%d" -qemu_rdma_dest_init_trying(const char *host, const char *ip) "%s => %s" -qemu_rdma_dump_id_failed(const char *who) "%s RDMA Device opened, but can't query port information" -qemu_rdma_dump_id(const char *who, const char *name, const char *dev_name, const char *dev_path, const char *ibdev_path, int transport, const char *transport_name) "%s RDMA Device opened: kernel name %s uverbs device name %s, infiniband_verbs class device path %s, infiniband class device path %s, transport: (%d) %s" -qemu_rdma_dump_gid(const char *who, const char *src, const char *dst) "%s Source GID: %s, Dest GID: %s" -qemu_rdma_exchange_get_response_start(const char *desc) "CONTROL: %s receiving..." -qemu_rdma_exchange_get_response_none(const char *desc, int type) "Surprise: got %s (%d)" -qemu_rdma_exchange_send_issue_callback(void) "" -qemu_rdma_exchange_send_waiting(const char *desc) "Waiting for response %s" -qemu_rdma_exchange_send_received(const char *desc) "Response %s received." -qemu_rdma_fill(size_t control_len, size_t size) "RDMA %zd of %zd bytes already in buffer" -qemu_rdma_init_ram_blocks(int blocks) "Allocated %d local ram block structures" -qemu_rdma_poll_recv(uint64_t comp, int64_t id, int sent) "completion %" PRIu64 " received (%" PRId64 ") left %d" -qemu_rdma_poll_write(uint64_t comp, int left, uint64_t block, uint64_t chunk, void *local, void *remote) "completions %" PRIu64 " left %d, block %" PRIu64 ", chunk: %" PRIu64 " %p %p" -qemu_rdma_poll_other(uint64_t comp, int left) "other completion %" PRIu64 " received left %d" -qemu_rdma_post_send_control(const char *desc) "CONTROL: sending %s.." -qemu_rdma_register_and_get_keys(uint64_t len, void *start) "Registering %" PRIu64 " bytes @ %p" -qemu_rdma_register_odp_mr(const char *name) "Try to register On-Demand Paging memory region: %s" -qemu_rdma_advise_mr(const char *name, uint32_t len, uint64_t addr, const char *res) "Try to advise block %s prefetch at %" PRIu32 "@0x%" PRIx64 ": %s" -qemu_rdma_resolve_host_trying(const char *host, const char *ip) "Trying %s => %s" -qemu_rdma_signal_unregister_append(uint64_t chunk, int pos) "Appending unregister chunk %" PRIu64 " at position %d" -qemu_rdma_signal_unregister_already(uint64_t chunk) "Unregister chunk %" PRIu64 " already in queue" -qemu_rdma_unregister_waiting_inflight(uint64_t chunk) "Cannot unregister inflight chunk: %" PRIu64 -qemu_rdma_unregister_waiting_proc(uint64_t chunk, int pos) "Processing unregister for chunk: %" PRIu64 " at position %d" -qemu_rdma_unregister_waiting_send(uint64_t chunk) "Sending unregister for chunk: %" PRIu64 -qemu_rdma_unregister_waiting_complete(uint64_t chunk) "Unregister for chunk: %" PRIu64 " complete." -qemu_rdma_write_flush(int sent) "sent total: %d" -qemu_rdma_write_one_block(int count, int block, uint64_t chunk, uint64_t current, uint64_t len, int nb_sent, int nb_chunks) "(%d) Not clobbering: block: %d chunk %" PRIu64 " current %" PRIu64 " len %" PRIu64 " %d %d" -qemu_rdma_write_one_post(uint64_t chunk, long addr, long remote, uint32_t len) "Posting chunk: %" PRIu64 ", addr: 0x%lx remote: 0x%lx, bytes %" PRIu32 -qemu_rdma_write_one_queue_full(void) "" -qemu_rdma_write_one_recvregres(int mykey, int theirkey, uint64_t chunk) "Received registration result: my key: 0x%x their key 0x%x, chunk %" PRIu64 -qemu_rdma_write_one_sendreg(uint64_t chunk, int len, int index, int64_t offset) "Sending registration request chunk %" PRIu64 " for %d bytes, index: %d, offset: %" PRId64 -qemu_rdma_write_one_top(uint64_t chunks, uint64_t size) "Writing %" PRIu64 " chunks, (%" PRIu64 " MB)" -qemu_rdma_write_one_zero(uint64_t chunk, int len, int index, int64_t offset) "Entire chunk is zero, sending compress: %" PRIu64 " for %d bytes, index: %d, offset: %" PRId64 -rdma_add_block(const char *block_name, int block, uint64_t addr, uint64_t offset, uint64_t len, uint64_t end, uint64_t bits, int chunks) "Added Block: '%s':%d, addr: %" PRIu64 ", offset: %" PRIu64 " length: %" PRIu64 " end: %" PRIu64 " bits %" PRIu64 " chunks %d" -rdma_block_notification_handle(const char *name, int index) "%s at %d" -rdma_delete_block(void *block, uint64_t addr, uint64_t offset, uint64_t len, uint64_t end, uint64_t bits, int chunks) "Deleted Block: %p, addr: %" PRIu64 ", offset: %" PRIu64 " length: %" PRIu64 " end: %" PRIu64 " bits %" PRIu64 " chunks %d" -rdma_registration_handle_compress(int64_t length, int index, int64_t offset) "Zapping zero chunk: %" PRId64 " bytes, index %d, offset %" PRId64 -rdma_registration_handle_finished(void) "" -rdma_registration_handle_ram_blocks(void) "" -rdma_registration_handle_ram_blocks_loop(const char *name, uint64_t offset, uint64_t length, void *local_host_addr, unsigned int src_index) "%s: @0x%" PRIx64 "/%" PRIu64 " host:@%p src_index: %u" -rdma_registration_handle_register(int requests) "%d requests" -rdma_registration_handle_register_loop(int req, int index, uint64_t addr, uint64_t chunks) "Registration request (%d): index %d, current_addr %" PRIu64 " chunks: %" PRIu64 -rdma_registration_handle_register_rkey(int rkey) "0x%x" -rdma_registration_handle_unregister(int requests) "%d requests" -rdma_registration_handle_unregister_loop(int count, int index, uint64_t chunk) "Unregistration request (%d): index %d, chunk %" PRIu64 -rdma_registration_handle_unregister_success(uint64_t chunk) "%" PRIu64 -rdma_registration_handle_wait(void) "" -rdma_registration_start(uint64_t flags) "%" PRIu64 -rdma_registration_stop(uint64_t flags) "%" PRIu64 -rdma_registration_stop_ram(void) "" -rdma_start_incoming_migration(void) "" -rdma_start_incoming_migration_after_dest_init(void) "" -rdma_start_incoming_migration_after_rdma_listen(void) "" -rdma_start_outgoing_migration_after_rdma_connect(void) "" -rdma_start_outgoing_migration_after_rdma_source_init(void) "" - # postcopy-ram.c postcopy_discard_send_finish(const char *ramblock, int nwords, int ncmds) "%s mask words sent=%d in %d commands" postcopy_discard_send_range(const char *ramblock, unsigned long start, unsigned long length) "%s:%lx/%lx" diff --git a/qapi/migration.json b/qapi/migration.json index a351fd3714..4d7d49bfec 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -210,9 +210,9 @@ # # @setup-time: amount of setup time in milliseconds *before* the # iterations begin but *after* the QMP command is issued. This is -# designed to provide an accounting of any activities (such as -# RDMA pinning) which may be expensive, but do not actually occur -# during the iterative migration rounds themselves. (since 1.6) +# designed to provide an accounting of any activities which may be +# expensive, but do not actually occur during the iterative migration +# rounds themselves. (since 1.6) # # @cpu-throttle-percentage: percentage of time guest cpus are being # throttled during auto-converge. This is only present when @@ -378,10 +378,6 @@ # for certain work loads, by sending compressed difference of the # pages # -# @rdma-pin-all: Controls whether or not the entire VM memory -# footprint is mlock()'d on demand or all at once. Refer to -# docs/rdma.txt for usage. Disabled by default. (since 2.0) -# # @zero-blocks: During storage migration encode blocks of zeroes # efficiently. This essentially saves 1MB of zeroes per block on # the wire. Enabling requires source and target VM to support @@ -476,7 +472,7 @@ # Since: 1.2 ## { 'enum': 'MigrationCapability', - 'data': ['xbzrle', 'rdma-pin-all', 'auto-converge', 'zero-blocks', + 'data': ['xbzrle', 'auto-converge', 'zero-blocks', 'events', 'postcopy-ram', { 'name': 'x-colo', 'features': [ 'unstable' ] }, 'release-ram', @@ -533,7 +529,6 @@ # -> { "execute": "query-migrate-capabilities" } # <- { "return": [ # {"state": false, "capability": "xbzrle"}, -# {"state": false, "capability": "rdma-pin-all"}, # {"state": false, "capability": "auto-converge"}, # {"state": false, "capability": "zero-blocks"}, # {"state": true, "capability": "events"}, diff --git a/scripts/analyze-migration.py b/scripts/analyze-migration.py index 8a254a5b6a..70e77622d3 100755 --- a/scripts/analyze-migration.py +++ b/scripts/analyze-migration.py @@ -110,7 +110,6 @@ class RamSection(object): RAM_SAVE_FLAG_EOS = 0x10 RAM_SAVE_FLAG_CONTINUE = 0x20 RAM_SAVE_FLAG_XBZRLE = 0x40 - RAM_SAVE_FLAG_HOOK = 0x80 RAM_SAVE_FLAG_COMPRESS_PAGE = 0x100 RAM_SAVE_FLAG_MULTIFD_FLUSH = 0x200 @@ -203,8 +202,6 @@ def read(self): flags &= ~self.RAM_SAVE_FLAG_PAGE elif flags & self.RAM_SAVE_FLAG_XBZRLE: raise Exception("XBZRLE RAM compression is not supported yet") - elif flags & self.RAM_SAVE_FLAG_HOOK: - raise Exception("RAM hooks don't make sense with files") if flags & self.RAM_SAVE_FLAG_MULTIFD_FLUSH: continue -- 2.43.0
