diff options
| author | Peter Maydell <peter.maydell@linaro.org> | 2013-07-16 13:25:07 +0100 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2013-07-19 12:58:46 +0100 |
| commit | e63c0ba1bce0b3cc7037c6c2d327267a585534ec (patch) | |
| tree | 7c6c535f6a0e555b601560e87d0b9148c0bd0faa | |
| parent | 70976c41c1def9d6e8b664c64cdf83b1ea0daa03 (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>
Message-id: 1373977512-28932-4-git-send-email-peter.maydell@linaro.org
| -rw-r--r-- | hw/virtio/virtio.c | 8 | ||||
| -rw-r--r-- | include/hw/virtio/virtio.h | 1 |
2 files changed, 9 insertions, 0 deletions
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index 8176c147e1..01b05f37e1 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -667,6 +667,14 @@ hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n) return vdev->vq[n].pa; } +void virtio_queue_set_num(VirtIODevice *vdev, int n, int num) +{ + if (num <= VIRTQUEUE_MAX_SIZE) { + 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/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h index 5d1d2be295..65f378d198 100644 --- a/include/hw/virtio/virtio.h +++ b/include/hw/virtio/virtio.h @@ -200,6 +200,7 @@ 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, hwaddr addr); hwaddr 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); |