tree 5e5563d6e107fe73724af493f7025d181374c675
parent b681a1c73e15e08c70c10cccd9c9f5b65cca12e8
author Stefan Hajnoczi <stefanha@redhat.com> 1375102917 +0200
committer Stefan Hajnoczi <stefanha@redhat.com> 1375111134 +0200

migration: notify migration state before starting thread

The migration thread runs outside the QEMU global mutex when possible.
Therefore we must notify migration state change *before* starting the
migration thread.

This allows registered listeners to act before live migration iterations
begin.  Therefore they can get into a state that allows for live
migration.  When the migration thread starts everything will be ready.

Without this patch there is a race condition during migration setup,
depending on whether the migration thread has already transitioned from
SETUP to ACTIVE state.

Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>