On Wed, Jun 03, 2020 at 04:48:54PM +0200, David Hildenbrand wrote: > This is the very basic, initial version of virtio-mem. More info on > virtio-mem in general can be found in the Linux kernel driver v2 posting > [1] and in patch #10. The latest Linux driver v4 can be found at [2]. > > This series is based on [3]: > "[PATCH v1] pc: Support coldplugging of virtio-pmem-pci devices on all > buses" > > The patches can be found at: > https://github.com/davidhildenbrand/qemu.git virtio-mem-v3 So given we tweaked the config space a bit, this needs a respin. > "The basic idea of virtio-mem is to provide a flexible, > cross-architecture memory hot(un)plug solution that avoids many limitations > imposed by existing technologies, architectures, and interfaces." > > There are a lot of addons in the works (esp. protection of unplugged > memory, better hugepage support (esp. when reading unplugged memory), > resizeable memory backends, support for more architectures, ...), this is > the very basic version to get the ball rolling. > > The first 8 patches make sure we don't have any sudden surprises e.g., if > somebody tries to pin all memory in RAM blocks, resulting in a higher > memory consumption than desired. The remaining patches add basic virtio-mem > along with support for x86-64. > > > Note: Since commit 7d2ef6dcc1cf ("hmp: Simplify qom-set"), the behavior of > qom-set changed and we can no longer pass proper sizes (e.g., 300M). The > description in patch #10 is outdated - but I hope that we'll bring back the > old behaviour, so I kept it for now :) > > [1] https://lkml.kernel.org/r/20200311171422.10484-1-david@xxxxxxxxxx > [2] https://lkml.kernel.org/r/20200507140139.17083-1-david@xxxxxxxxxx > [3] https://lkml.kernel.org/r/20200525084511.51379-1-david@xxxxxxxxxx > > Cc: teawater <teawaterz@xxxxxxxxxxxxxxxxx> > Cc: Pankaj Gupta <pankaj.gupta.linux@xxxxxxxxx> > > v2 -> v3: > - Rebased on upstream/[3] > - "virtio-mem: Exclude unplugged memory during migration" > -- Added > - "virtio-mem: Paravirtualized memory hot(un)plug" > -- Simplify bitmap operations, find consecutive areas > -- Tweak error messages > -- Reshuffle some checks > -- Minor cleanups > - "accel/kvm: Convert to ram_block_discard_disable()" > - "target/i386: sev: Use ram_block_discard_disable()" > -- Keep asserts clean of functional things > > v1 -> v2: > - Rebased to object_property_*() changes > - "exec: Introduce ram_block_discard_(disable|require)()" > -- Change the function names and rephrase/add comments > - "virtio-balloon: Rip out qemu_balloon_inhibit()" > -- Add and use "migration_in_incoming_postcopy()" > - "migration/rdma: Use ram_block_discard_disable()" > -- Add a comment regarding pin_all vs. !pin_all > - "virtio-mem: Paravirtualized memory hot(un)plug" > -- Replace virtio_mem_discard_inhibited() by > migration_in_incoming_postcopy() > -- Drop some asserts > -- Drop virtio_mem_bad_request(), use virtio_error() directly, printing > more information > -- Replace "Note: Discarding should never fail ..." comments by > error_report() > -- Replace virtio_stw_p() by cpu_to_le16() > -- Drop migration_addr and migration_block_size > -- Minor cleanups > - "linux-headers: update to contain virtio-mem" > -- Updated to latest v4 in Linux > - General changes > -- Fixup the users of the renamed ram_block_discard_(disable|require) > -- Use "X: cannot disable RAM discard"-styled error messages > - Added > -- "virtio-mem: Migration sanity checks" > -- "virtio-mem: Add trace events" > > David Hildenbrand (20): > exec: Introduce ram_block_discard_(disable|require)() > vfio: Convert to ram_block_discard_disable() > accel/kvm: Convert to ram_block_discard_disable() > s390x/pv: Convert to ram_block_discard_disable() > virtio-balloon: Rip out qemu_balloon_inhibit() > target/i386: sev: Use ram_block_discard_disable() > migration/rdma: Use ram_block_discard_disable() > migration/colo: Use ram_block_discard_disable() > linux-headers: update to contain virtio-mem > virtio-mem: Paravirtualized memory hot(un)plug > virtio-pci: Proxy for virtio-mem > MAINTAINERS: Add myself as virtio-mem maintainer > hmp: Handle virtio-mem when printing memory device info > numa: Handle virtio-mem in NUMA stats > pc: Support for virtio-mem-pci > virtio-mem: Allow notifiers for size changes > virtio-pci: Send qapi events when the virtio-mem size changes > virtio-mem: Migration sanity checks > virtio-mem: Add trace events > virtio-mem: Exclude unplugged memory during migration > > MAINTAINERS | 8 + > accel/kvm/kvm-all.c | 4 +- > balloon.c | 17 - > exec.c | 52 ++ > hw/core/numa.c | 6 + > hw/i386/Kconfig | 1 + > hw/i386/pc.c | 49 +- > hw/s390x/s390-virtio-ccw.c | 22 +- > hw/vfio/ap.c | 10 +- > hw/vfio/ccw.c | 11 +- > hw/vfio/common.c | 53 +- > hw/vfio/pci.c | 6 +- > hw/virtio/Kconfig | 11 + > hw/virtio/Makefile.objs | 2 + > hw/virtio/trace-events | 10 + > hw/virtio/virtio-balloon.c | 8 +- > hw/virtio/virtio-mem-pci.c | 157 ++++ > hw/virtio/virtio-mem-pci.h | 34 + > hw/virtio/virtio-mem.c | 876 ++++++++++++++++++++ > include/exec/memory.h | 41 + > include/hw/pci/pci.h | 1 + > include/hw/vfio/vfio-common.h | 4 +- > include/hw/virtio/virtio-mem.h | 86 ++ > include/migration/colo.h | 2 +- > include/migration/misc.h | 2 + > include/standard-headers/linux/virtio_ids.h | 1 + > include/standard-headers/linux/virtio_mem.h | 211 +++++ > include/sysemu/balloon.h | 2 - > migration/migration.c | 15 +- > migration/postcopy-ram.c | 23 - > migration/rdma.c | 18 +- > migration/savevm.c | 11 +- > monitor/hmp-cmds.c | 16 + > monitor/monitor.c | 1 + > qapi/misc.json | 64 +- > target/i386/sev.c | 7 + > 36 files changed, 1721 insertions(+), 121 deletions(-) > create mode 100644 hw/virtio/virtio-mem-pci.c > create mode 100644 hw/virtio/virtio-mem-pci.h > create mode 100644 hw/virtio/virtio-mem.c > create mode 100644 include/hw/virtio/virtio-mem.h > create mode 100644 include/standard-headers/linux/virtio_mem.h > > -- > 2.25.4
