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: Peter Maydell <[email protected]> Message-id: [email protected] Reviewed-by: Michael S. Tsirkin <[email protected]> --- hw/virtio/virtio-mmio.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/hw/virtio/virtio-mmio.c b/hw/virtio/virtio-mmio.c index 88cf994..4bd2953 100644 --- a/hw/virtio/virtio-mmio.c +++ b/hw/virtio/virtio-mmio.c @@ -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) -- 1.7.9.5
