From: Stefan Hajnoczi <stefanha@redhat.com>
To: Ladi Prosek <lprosek@redhat.com>
Cc: qemu-devel@nongnu.org, mst@redhat.com, rkagan@virtuozzo.com
Subject: Re: [Qemu-devel] [PATCH 3/3] virtio-balloon: fix stats vq migration
Date: Wed, 7 Sep 2016 14:02:20 -0400 [thread overview]
Message-ID: <20160907180220.GD18576@stefanha-x1.localdomain> (raw)
In-Reply-To: <1473261649-31465-4-git-send-email-lprosek@redhat.com>
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On Wed, Sep 07, 2016 at 05:20:49PM +0200, Ladi Prosek wrote:
> The statistics virtqueue is not migrated properly because virtio-balloon
> does not include s->stats_vq_elem in the migration stream.
>
> After migration the statistics virtqueue hangs because the host never
> completes the last element (s->stats_vq_elem is NULL on the destination
> QEMU). Therefore the guest never submits new elements and the virtqueue
> is hung.
>
> Instead of changing the migration stream format in an incompatible way,
> detect the migration case and rewind the virtqueue so the last element
> can be completed.
>
> Cc: Michael S. Tsirkin <mst@redhat.com>
> Cc: Roman Kagan <rkagan@virtuozzo.com>
> Cc: Stefan Hajnoczi <stefanha@redhat.com>
> Suggested-by: Roman Kagan <rkagan@virtuozzo.com>
> Signed-off-by: Ladi Prosek <lprosek@redhat.com>
> ---
> hw/virtio/virtio-balloon.c | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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next prev parent reply other threads:[~2016-09-07 18:02 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-07 15:20 [Qemu-devel] [PATCH 0/3] virtio-balloon: stats vq fixes Ladi Prosek
2016-09-07 15:20 ` [Qemu-devel] [PATCH 1/3] virtio-balloon: discard virtqueue element on reset Ladi Prosek
2016-09-07 17:48 ` Stefan Hajnoczi
2016-09-08 6:38 ` Roman Kagan
2016-09-07 15:20 ` [Qemu-devel] [PATCH 2/3] virtio: add virtqueue_rewind() Ladi Prosek
2016-09-08 6:44 ` Roman Kagan
2016-09-08 7:30 ` Ladi Prosek
2016-09-12 9:20 ` Stefan Hajnoczi
2016-09-07 15:20 ` [Qemu-devel] [PATCH 3/3] virtio-balloon: fix stats vq migration Ladi Prosek
2016-09-07 18:02 ` Stefan Hajnoczi [this message]
2016-09-08 6:47 ` Roman Kagan
2016-09-07 18:02 ` [Qemu-devel] [PATCH 0/3] virtio-balloon: stats vq fixes Stefan Hajnoczi
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