Commit f7b803b3 authored by Peter Maydell's avatar Peter Maydell
Browse files

hw/virtio/virtio-mmio: Make QueueNumMax read 0 for unavailable queues 



The virtio-mmio spec says that QueueNumMax must read zero for queues
which are unavailable; implement this, rather than always returning
VIRTQUEUE_MAX_SIZE.

Signed-off-by: default avatarPeter Maydell <peter.maydell@linaro.org>
Message-id: 1374853288-9912-3-git-send-email-peter.maydell@linaro.org
Reviewed-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent f6049f44

hw/virtio/virtio-mmio.c

+3 −0
Original line number Diff line number Diff line
@@ -151,6 +151,9 @@ static uint64_t virtio_mmio_read(void *opaque, hwaddr offset, unsigned size) 
        }

        return proxy->host_features;

    case VIRTIO_MMIO_QUEUENUMMAX:

        if (!virtio_queue_get_num(vdev, vdev->queue_sel)) {

            return 0;

        }

        return VIRTQUEUE_MAX_SIZE;

    case VIRTIO_MMIO_QUEUEPFN:

        return virtio_queue_get_addr(vdev, vdev->queue_sel)