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From: "Michael S. Tsirkin" <mst@redhat.com>
To: qemu-devel@nongnu.org
Subject: [PATCH] virtio: update queue size on guest write
Date: Fri, 13 Dec 2019 09:24:03 -0500	[thread overview]
Message-ID: <20191213142358.345301-1-mst@redhat.com> (raw)

Some guests read back queue size after writing it.
Update the size immediatly upon write otherwise
they get confused.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/virtio/virtio-pci.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index c6b47a9c73..e5c759e19e 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -1256,6 +1256,8 @@ static void virtio_pci_common_write(void *opaque, hwaddr addr,
         break;
     case VIRTIO_PCI_COMMON_Q_SIZE:
         proxy->vqs[vdev->queue_sel].num = val;
+        virtio_queue_set_num(vdev, vdev->queue_sel,
+                             proxy->vqs[vdev->queue_sel].num);
         break;
     case VIRTIO_PCI_COMMON_Q_MSIX:
         msix_vector_unuse(&proxy->pci_dev,
-- 
MST



             reply	other threads:[~2019-12-13 21:27 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-13 14:24 Michael S. Tsirkin [this message]
2019-12-16  8:50 ` [PATCH] virtio: update queue size on guest write Stefano Garzarella
2019-12-16 10:52   ` Michael S. Tsirkin

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