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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
This commit is contained in:
Peter Maydell 2013-07-16 13:25:07 +01:00
parent 70976c41c1
commit e63c0ba1bc
2 changed files with 9 additions and 0 deletions
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8
hw/virtio/virtio.c
View File

@ -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;

1
include/hw/virtio/virtio.h
View File

@ -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);