[Qemu-devel] [PATCH v5 00/21] 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 "protocol feature negotiation" series proposed
earlier by Michael S. Tsirkinm and "vhost user: Add live migration"
series from Thibaut Collet .

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 (18):
  configure: probe for memfd
  util: add linux-only memfd fallback
  util: add memfd helpers
  vhost: alloc shareable log
  vhost: document log resizing
  vhost: add vhost_set_log_base op
  vhost-user: send log shm fd along with log_base
  vhost-user: add a migration blocker
  vhost: use a function for each call
  vhost: only use shared log if in use by backend
  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 (2):
  vhost user: add support of live migration
  vhost user: add rarp sending after live migration for legacy guest

 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            | 571 ++++++++++++++++++++++++--------------
 hw/virtio/vhost.c                 | 101 ++++---
 include/hw/virtio/vhost-backend.h |  77 ++++-
 include/hw/virtio/vhost.h         |  15 +-
 include/net/vhost_net.h           |   1 +
 include/qemu/memfd.h              |  24 ++
 net/vhost-user.c                  |  34 ++-
 tests/vhost-user-test.c           | 390 ++++++++++++++++++++++----
 trace-events                      |   3 +
 util/Makefile.objs                |   2 +-
 util/memfd.c                      | 126 +++++++++
 16 files changed, 1260 insertions(+), 329 deletions(-)
 create mode 100644 include/qemu/memfd.h
 create mode 100644 util/memfd.c

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2.4.3