[Qemu-devel] [PATCH v6 00/24] vhost-user: add migration support

[marcandre.lureau@redhat.com]

From: Marc-André Lureau <marcandre.lureau@redhat.com>

Hi,

The following series implement shareable log for vhost-user to support
memory tracking during live migration. On qemu-side, the solution is
fairly straightfoward since vhost already supports the dirty log, only
vhost-user couldn't access the log memory until then.

The series includes "vhost user: Add live migration" patches from
Thibaut Collet.

v5->v6:
- rebased
- fix protocol feature mask update
- add a patch from Thibault Collet using enum for features, and
  compute mask
- add unistd.h linux headers to help building memfd if missing on
  build host. Hopefully will be useful for other syscalls some day
- reorder/merge patches to share-allocate the log only if needed
- split the memfd helper to allow to drop the fallback code
- allow to call qemu_memfd_free() even if alloc failed
- add some missing spaces

v4->v5:
- rebase on top of last Michael S. Tsirkin PULL request
- block live migration if !PROTOCOL_F_LOG_SHMFD
- wait for a reply after SET_LOG_BASE
- split vhost_set_log_base from the rest of vhost_call refactoring
- use a seperate global vhost_log_shm

v3->v4:
- add the proto negotiation & the migration series
- replace the varargs vhost_call() approach for callbacks
- only share-allocate when the backend needs it

v2->v3:
- changed some patch summary
- added migration tests
- added a patch to replace error message with a trace

The development branch I used is:
https://github.com/elmarco/qemu branch "vhost-user"

Marc-André Lureau (20):
  configure: probe for memfd
  linux-headers: add unistd.h
  util: add linux-only memfd fallback
  util: add memfd helpers
  memfd: add fallback for memfd
  vhost: document log resizing
  vhost: add vhost_set_log_base op
  vhost-user: add vhost_user_requires_shm_log()
  vhost: alloc shareable log
  vhost-user: send log shm fd along with log_base
  vhost-user: add a migration blocker
  vhost: use a function for each call
  vhost-user: document migration log
  net: add trace_vhost_user_event
  vhost-user-test: move wait_for_fds() out
  vhost-user-test: remove useless static check
  vhost-user-test: wrap server in TestServer struct
  vhost-user-test: learn to tweak various qemu arguments
  vhost-user-test: add live-migration test
  vhost-user-test: check ownership during migration

Michael S. Tsirkin (1):
  vhost-user: unit test for new messages

Thibaut Collet (3):
  vhost user: add support of live migration
  vhost user: add rarp sending after live migration for legacy guest
  vhost-user: use an enum helper for features mask

 configure                          |   19 +
 docs/specs/vhost-user.txt          |   63 ++-
 hw/net/vhost_net.c                 |   35 +-
 hw/scsi/vhost-scsi.c               |    7 +-
 hw/virtio/vhost-backend.c          |  121 +++-
 hw/virtio/vhost-user.c             |  576 ++++++++++++-------
 hw/virtio/vhost.c                  |  102 ++--
 include/hw/virtio/vhost-backend.h  |   77 ++-
 include/hw/virtio/vhost.h          |   15 +-
 include/net/vhost_net.h            |    1 +
 include/qemu/memfd.h               |   24 +
 linux-headers/asm-arm/unistd.h     |  448 +++++++++++++++
 linux-headers/asm-arm64/kvm.h      |   37 +-
 linux-headers/asm-arm64/unistd.h   |   16 +
 linux-headers/asm-mips/unistd.h    | 1063 ++++++++++++++++++++++++++++++++++++
 linux-headers/asm-powerpc/unistd.h |  392 +++++++++++++
 linux-headers/asm-s390/unistd.h    |  404 ++++++++++++++
 linux-headers/asm-x86/unistd.h     |   15 +
 linux-headers/asm-x86/unistd_32.h  |  377 +++++++++++++
 linux-headers/asm-x86/unistd_64.h  |  330 +++++++++++
 linux-headers/asm-x86/unistd_x32.h |  319 +++++++++++
 net/vhost-user.c                   |   34 +-
 scripts/update-linux-headers.sh    |    7 +-
 tests/vhost-user-test.c            |  390 +++++++++++--
 trace-events                       |    3 +
 util/Makefile.objs                 |    2 +-
 util/memfd.c                       |  129 +++++
 27 files changed, 4673 insertions(+), 333 deletions(-)
 create mode 100644 include/qemu/memfd.h
 create mode 100644 linux-headers/asm-arm/unistd.h
 create mode 100644 linux-headers/asm-arm64/unistd.h
 create mode 100644 linux-headers/asm-mips/unistd.h
 create mode 100644 linux-headers/asm-powerpc/unistd.h
 create mode 100644 linux-headers/asm-s390/unistd.h
 create mode 100644 linux-headers/asm-x86/unistd.h
 create mode 100644 linux-headers/asm-x86/unistd_32.h
 create mode 100644 linux-headers/asm-x86/unistd_64.h
 create mode 100644 linux-headers/asm-x86/unistd_x32.h
 create mode 100644 util/memfd.c

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2.4.3