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[Qemu-devel] [PATCH] virtio-balloon: stats vq migration spec compliance
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] [PATCH] virtio-balloon: stats vq migration spec compliance |
Date: |
Tue, 16 Aug 2016 00:32:55 +0300 |
virtio spec says that devices must not touch VQs
before DRIVER_OK is set.
Additionally, balloon must not touch stats VQ
unless the stats feature bit has been negotiated.
Cc: Ladi Prosek <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
---
hw/virtio/virtio-balloon.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/hw/virtio/virtio-balloon.c b/hw/virtio/virtio-balloon.c
index 65457e9..7189260 100644
--- a/hw/virtio/virtio-balloon.c
+++ b/hw/virtio/virtio-balloon.c
@@ -427,6 +427,7 @@ static void virtio_balloon_vmstate_cb(void *opaque, int
running,
RunState state)
{
VirtIOBalloon *s = opaque;
+ VirtIODevice *vdev = VIRTIO_DEVICE(s);
if (!running) {
/* put the stats element back if the VM is not running */
@@ -436,7 +437,8 @@ static void virtio_balloon_vmstate_cb(void *opaque, int
running,
s->stats_vq_elem = NULL;
}
- } else {
+ } else if (balloon_stats_supported(s) &&
+ (vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
/* poll stats queue for the element we may have discarded
* when the VM was stopped */
virtio_balloon_receive_stats(VIRTIO_DEVICE(s), s->svq);
--
MST
- [Qemu-devel] [PATCH] virtio-balloon: stats vq migration spec compliance,
Michael S. Tsirkin <=