diff options
authorPeter Maydell <peter.maydell@linaro.org>2012-01-06 16:44:19 +0000
committerPeter Maydell <peter.maydell@linaro.org>2012-03-03 21:47:32 +0000
commit116364bd8e654646aaf79591077ac0c4b9b7c3fa (patch)
parent41e37c33fc5897ff8015af8e0e3f5eb13c394b51 (diff)
virtio: Add support for guest setting of queue size
The MMIO virtio transport spec allows the guest to tell the host how large the queue size is. Add virtio_queue_set_num() function which implements this in the QEMU common virtio support code. Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2 files changed, 7 insertions, 0 deletions
diff --git a/hw/virtio.c b/hw/virtio.c
index 064aecf553..22ea8181c0 100644
--- a/hw/virtio.c
+++ b/hw/virtio.c
@@ -619,6 +619,12 @@ target_phys_addr_t virtio_queue_get_addr(VirtIODevice *vdev, int n)
return vdev->vq[n].pa;
+void virtio_queue_set_num(VirtIODevice *vdev, int n, int num)
+ vdev->vq[n].vring.num = num;
+ virtqueue_init(&vdev->vq[n]);
int virtio_queue_get_num(VirtIODevice *vdev, int n)
return vdev->vq[n].vring.num;
diff --git a/hw/virtio.h b/hw/virtio.h
index 400c092c95..1f5aa57075 100644
--- a/hw/virtio.h
+++ b/hw/virtio.h
@@ -178,6 +178,7 @@ void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data);
void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data);
void virtio_queue_set_addr(VirtIODevice *vdev, int n, target_phys_addr_t addr);
target_phys_addr_t virtio_queue_get_addr(VirtIODevice *vdev, int n);
+void virtio_queue_set_num(VirtIODevice *vdev, int n, int num);
int virtio_queue_get_num(VirtIODevice *vdev, int n);
void virtio_queue_notify(VirtIODevice *vdev, int n);
uint16_t virtio_queue_vector(VirtIODevice *vdev, int n);