[Qemu-devel] [PATCH 0/3] dataplane: virtio-blk live migration with x-data-plane=on

[Stefan Hajnoczi <stefanha@redhat.com>]

These patches add live migration support to -device virtio-blk-pci,x-data-plane=on.

Patch 1 has already been posted and merged into the block tree.  I have
included it for convenience.

Patches 2 & 3 implement a switch from dataplane mode back to regular virtio-blk
mode when migration starts.  This way live migration works.

If migration is cancelled or the guest accesses the virtio-blk device after
completion, dataplane starts again.

Since this approach is so small, it's more palatable for QEMU 1.6 than trying
to make vring.c log dirty memory.  It makes dataplane usable in situations
where live migration is a requirement.

Stefan Hajnoczi (3):
  dataplane: sync virtio.c and vring.c virtqueue state
  migration: notify migration state before starting thread
  dataplane: enable virtio-blk x-data-plane=on live migration

 hw/block/dataplane/virtio-blk.c     | 19 +++++++++----------
 hw/block/virtio-blk.c               | 32 ++++++++++++++++++++++++++++++++
 hw/virtio/dataplane/vring.c         |  8 +++++---
 include/hw/virtio/dataplane/vring.h |  2 +-
 include/hw/virtio/virtio-blk.h      |  1 +
 migration.c                         |  4 +++-
 6 files changed, 51 insertions(+), 15 deletions(-)

-- 
1.8.1.4