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vhost: allow per device message handler

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This patch allow device to register its own message handler during
vhost_dev_init(). vDPA device will use it to implement its own DMA
mapping logic.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20200326140125.19794-3-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang
2020-03-26 22:01:18 +08:00
committed by Michael S. Tsirkin
parent 20c384f1ea
commit 792a4f2ed2
5 changed files with 19 additions and 6 deletions
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12
drivers/vhost/vhost.c
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@@ -457,7 +457,9 @@ static size_t vhost_get_desc_size(struct vhost_virtqueue *vq,
void vhost_dev_init(struct vhost_dev *dev,
struct vhost_virtqueue **vqs, int nvqs,
int iov_limit, int weight, int byte_weight)
int iov_limit, int weight, int byte_weight,
int (*msg_handler)(struct vhost_dev *dev,
struct vhost_iotlb_msg *msg))
{
struct vhost_virtqueue *vq;
int i;
@@ -473,6 +475,7 @@ void vhost_dev_init(struct vhost_dev *dev,
dev->iov_limit = iov_limit;
dev->weight = weight;
dev->byte_weight = byte_weight;
dev->msg_handler = msg_handler;
init_llist_head(&dev->work_list);
init_waitqueue_head(&dev->wait);
INIT_LIST_HEAD(&dev->read_list);
@@ -1178,7 +1181,12 @@ ssize_t vhost_chr_write_iter(struct vhost_dev *dev,
ret = -EINVAL;
goto done;
}
if (vhost_process_iotlb_msg(dev, &msg)) {
if (dev->msg_handler)
ret = dev->msg_handler(dev, &msg);
else
ret = vhost_process_iotlb_msg(dev, &msg);
if (ret) {
ret = -EFAULT;
goto done;
}