On 05/11/2010 02:17 AM, Cam Macdonell wrote:
On Mon, May 10, 2010 at 5:59 AM, Avi Kivity<avi@xxxxxxxxxx> wrote:
On 04/21/2010 08:53 PM, Cam Macdonell wrote:
Support an inter-vm shared memory device that maps a shared-memory object
as a
PCI device in the guest. This patch also supports interrupts between
guest by
communicating over a unix domain socket. This patch applies to the
qemu-kvm
repository.
-device ivshmem,size=<size in format accepted by -m>[,shm=<shm name>]
Interrupts are supported between multiple VMs by using a shared memory
server
by using a chardev socket.
-device ivshmem,size=<size in format accepted by -m>[,shm=<shm name>]
[,chardev=<id>][,msi=on][,irqfd=on][,vectors=n]
-chardev socket,path=<path>,id=<id>
(shared memory server is qemu.git/contrib/ivshmem-server)
Sample programs and init scripts are in a git repo here:
+typedef struct EventfdEntry {
+ PCIDevice *pdev;
+ int vector;
+} EventfdEntry;
+
+typedef struct IVShmemState {
+ PCIDevice dev;
+ uint32_t intrmask;
+ uint32_t intrstatus;
+ uint32_t doorbell;
+
+ CharDriverState * chr;
+ CharDriverState ** eventfd_chr;
+ int ivshmem_mmio_io_addr;
+
+ pcibus_t mmio_addr;
+ unsigned long ivshmem_offset;
+ uint64_t ivshmem_size; /* size of shared memory region */
+ int shm_fd; /* shared memory file descriptor */
+
+ int nr_allocated_vms;
+ /* array of eventfds for each guest */
+ int ** eventfds;
+ /* keep track of # of eventfds for each guest*/
+ int * eventfds_posn_count;
More readable:
typedef struct Peer {
int nb_eventfds;
int *eventfds;
} Peer;
int nb_peers;
Peer *peers;
Does eventfd_chr need to be there as well?
No it does not, eventfd_chr store character devices for receiving
interrupts when irqfd is not available, so we only them for this
guest, not for our peers.
Ok.
Does this need to be part of the state?
They are because they're passed in as qdev properties from the
command-line so I thought they needed to be in the state struct to be
assigned via DEFINE_PROP_...
Well I'm not q-ualified to comment on qdev, so I'm fine either way with
this.
--
error compiling committee.c: too many arguments to function
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