File 0156-virtio-recalculate-vq-inuse-after-m.patch of Package qemu.10254

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File 0156-virtio-recalculate-vq-inuse-after-m.patch of Package qemu.10254

From 5af59db215ddd9af8c940a24a64643dbdfb999a6 Mon Sep 17 00:00:00 2001
From: Stefan Hajnoczi <stefanha@redhat.com>
Date: Mon, 15 Aug 2016 13:54:15 +0100
Subject: [PATCH] virtio: recalculate vq->inuse after migration

The vq->inuse field is not migrated.  Many devices don't hold
VirtQueueElements across migration so it doesn't matter that vq->inuse
starts at 0 on the destination QEMU.

At least virtio-serial, virtio-blk, and virtio-balloon migrate while
holding VirtQueueElements.  For these devices we need to recalculate
vq->inuse upon load so the value is correct.

Cc: qemu-stable@nongnu.org
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit bccdef6b1a204db0f41ffb6e24ce373e4d7890d4)
[BR: BSC#1015048]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 hw/virtio/virtio.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 249a0085a0..4268988263 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -1106,6 +1106,21 @@ int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id)
                 return -1;
             }
             vdev->vq[i].used_idx = vring_used_idx(&vdev->vq[i]);
+
+            /*
+             * Some devices migrate VirtQueueElements that have been popped
+             * from the avail ring but not yet returned to the used ring.
+             */
+            vdev->vq[i].inuse = vdev->vq[i].last_avail_idx -
+                                vdev->vq[i].used_idx;
+            if (vdev->vq[i].inuse > vdev->vq[i].vring.num) {
+                error_report("VQ %d size 0x%x < last_avail_idx 0x%x - "
+                             "used_idx 0x%x",
+                             i, vdev->vq[i].vring.num,
+                             vdev->vq[i].last_avail_idx,
+                             vdev->vq[i].used_idx);
+                return -1;
+            }
         }
     }

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File 0156-virtio-recalculate-vq-inuse-after-m.patch of Package qemu.10254

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