[RFC,0/2] vhost-user-fs: Stateful migration

Message

Hanna Czenczek March 13, 2023, 5:48 p.m. UTC

Hi,

Patch 1 of this RFC series adds virtio-fs-specific operations to vhost
for transferring a binary blob of back-end-internal state, and
implements those for vhost-user.

Patch 2 uses those operations to implement stateful migration for
vhost-user-fs devices, assuming the back-end (virtiofsd) supports it.

This is an RFC for multiple reasons, most notably:
- Patch 1 proposes yet undiscussed changes to the vhost protocol, which
  makes it RFC by default.
- Without much experience in the fields of migration or vhost (on the
  qemu side), I hope marking this as an RFC leads to extra scrutiny on
  the reviewer’s side. O:)


Hanna Czenczek (2):
  vhost-user: Add interface for virtio-fs migration
  vhost-user-fs: Implement stateful migration

 include/hw/virtio/vhost-backend.h |   9 ++
 include/hw/virtio/vhost.h         |  68 ++++++++++++
 hw/virtio/vhost-user-fs.c         | 171 +++++++++++++++++++++++++++++-
 hw/virtio/vhost-user.c            | 138 ++++++++++++++++++++++++
 hw/virtio/vhost.c                 |  29 +++++
 5 files changed, 414 insertions(+), 1 deletion(-)