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
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@ -667,6 +667,14 @@ hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n)
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return vdev->vq[n].pa;
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return vdev->vq[n].pa;
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}
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}
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void virtio_queue_set_num(VirtIODevice *vdev, int n, int num)
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{
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if (num <= VIRTQUEUE_MAX_SIZE) {
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vdev->vq[n].vring.num = num;
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virtqueue_init(&vdev->vq[n]);
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}
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}
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int virtio_queue_get_num(VirtIODevice *vdev, int n)
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int virtio_queue_get_num(VirtIODevice *vdev, int n)
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{
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{
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return vdev->vq[n].vring.num;
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return vdev->vq[n].vring.num;
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@ -200,6 +200,7 @@ void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data);
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void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data);
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void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data);
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void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr);
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void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr);
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hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n);
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hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n);
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void virtio_queue_set_num(VirtIODevice *vdev, int n, int num);
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int virtio_queue_get_num(VirtIODevice *vdev, int n);
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int virtio_queue_get_num(VirtIODevice *vdev, int n);
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void virtio_queue_notify(VirtIODevice *vdev, int n);
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void virtio_queue_notify(VirtIODevice *vdev, int n);
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uint16_t virtio_queue_vector(VirtIODevice *vdev, int n);
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uint16_t virtio_queue_vector(VirtIODevice *vdev, int n);
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