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migration: Inhibit virtio-balloon for the duration of background snapshot

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The same thing as for incoming postcopy - we cannot deal with concurrent
RAM discards when using background snapshot feature in outgoing migration.

Fixes: 8518278a6a (migration: implementation
  of background snapshot thread)
Signed-off-by: Andrey Gruzdev <andrey.gruzdev@virtuozzo.com>
Reported-by: David Hildenbrand <david@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Message-Id: <20210401092226.102804-3-andrey.gruzdev@virtuozzo.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Andrey Gruzdev 2021-04-01 12:22:24 +03:00 • committed by Dr. David Alan Gilbert
parent ecb23efea0
commit 1a8e44a89f
3 changed files with 16 additions and 2 deletions
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8
hw/virtio/virtio-balloon.c
View file

@ -66,8 +66,12 @@ static bool virtio_balloon_pbp_matches(PartiallyBalloonedPage *pbp,
static bool virtio_balloon_inhibited(void)
{
/* Postcopy cannot deal with concurrent discards, so it's special. */
return ram_block_discard_is_disabled() || migration_in_incoming_postcopy();
/*
* Postcopy cannot deal with concurrent discards,
* so it's special, as well as background snapshots.
*/
return ram_block_discard_is_disabled() || migration_in_incoming_postcopy() ||
migration_in_bg_snapshot();
}
static void balloon_inflate_page(VirtIOBalloon *balloon,