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qemu-patch-raspberry4
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virtio-mmio: update queue size on guest write 

Some guests read back queue size after writing it.
Always update the on size write otherwise they might be confused.

Cc: qemu-stable@nongnu.org
Signed-off-by: Denis Plotnikov <dplotnikov@virtuozzo.com>
Message-Id: <20191224081446.17003-1-dplotnikov@virtuozzo.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit 1049f4c62c)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
stable-4.2
Denis Plotnikov 2019-12-24 11:14:46 +03:00 committed by Michael Roth
parent 2f4affb721
commit 0253531824
1 changed files with 2 additions and 1 deletions
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3
hw/virtio/virtio-mmio.c
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@ -295,8 +295,9 @@ static void virtio_mmio_write(void *opaque, hwaddr offset, uint64_t value,
break;
case VIRTIO_MMIO_QUEUE_NUM:
trace_virtio_mmio_queue_write(value, VIRTQUEUE_MAX_SIZE);
virtio_queue_set_num(vdev, vdev->queue_sel, value);
if (proxy->legacy) {
virtio_queue_set_num(vdev, vdev->queue_sel, value);
virtio_queue_update_rings(vdev, vdev->queue_sel);
} else {
proxy->vqs[vdev->queue_sel].num = value;