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Re: [PATCH V2] virtio-pci: fix queue_enable write
From: |
Stefano Garzarella |
Subject: |
Re: [PATCH V2] virtio-pci: fix queue_enable write |
Date: |
Wed, 10 Jun 2020 10:57:26 +0200 |
On Wed, Jun 10, 2020 at 01:43:51PM +0800, Jason Wang wrote:
> Spec said: The driver uses this to selectively prevent the device from
> executing requests from this virtqueue. 1 - enabled; 0 - disabled.
>
> Though write 0 to queue_enable is forbidden by the spec, we should not
> assume that the value is 1.
>
> Fix this by ignore the write value other than 1.
>
> Signed-off-by: Jason Wang <jasowang@redhat.com>
> ---
> Changes from V1:
> - fix typo
> - warn wrong value through virtio_error
> ---
> hw/virtio/virtio-pci.c | 12 ++++++++----
> 1 file changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
> index d028c17c24..7bc8c1c056 100644
> --- a/hw/virtio/virtio-pci.c
> +++ b/hw/virtio/virtio-pci.c
> @@ -1273,16 +1273,20 @@ static void virtio_pci_common_write(void *opaque,
> hwaddr addr,
> virtio_queue_set_vector(vdev, vdev->queue_sel, val);
> break;
> case VIRTIO_PCI_COMMON_Q_ENABLE:
> - virtio_queue_set_num(vdev, vdev->queue_sel,
> - proxy->vqs[vdev->queue_sel].num);
> - virtio_queue_set_rings(vdev, vdev->queue_sel,
> + if (val == 1) {
Does it have to be 1 or can it be any value other than 0?
Thanks,
Stefano
> + virtio_queue_set_num(vdev, vdev->queue_sel,
> + proxy->vqs[vdev->queue_sel].num);
> + virtio_queue_set_rings(vdev, vdev->queue_sel,
> ((uint64_t)proxy->vqs[vdev->queue_sel].desc[1]) << 32
> |
> proxy->vqs[vdev->queue_sel].desc[0],
> ((uint64_t)proxy->vqs[vdev->queue_sel].avail[1]) <<
> 32 |
> proxy->vqs[vdev->queue_sel].avail[0],
> ((uint64_t)proxy->vqs[vdev->queue_sel].used[1]) << 32
> |
> proxy->vqs[vdev->queue_sel].used[0]);
> - proxy->vqs[vdev->queue_sel].enabled = 1;
> + proxy->vqs[vdev->queue_sel].enabled = 1;
> + } else {
> + virtio_error(vdev, "wrong value for queue_enable %"PRIx64, val);
> + }
> break;
> case VIRTIO_PCI_COMMON_Q_DESCLO:
> proxy->vqs[vdev->queue_sel].desc[0] = val;
> --
> 2.20.1
>
>