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vhost: Add Shadow VirtQueue call forwarding capabilities

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This will make qemu aware of the device used buffers, allowing it to
write the guest memory with its contents if needed.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Eugenio Pérez 2022-03-14 18:34:43 +01:00 • committed by Jason Wang
parent dff4426fa6
commit a8ac88585d
3 changed files with 71 additions and 2 deletions
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31
hw/virtio/vhost-vdpa.c
View file

@ -725,6 +725,13 @@ static int vhost_vdpa_set_vring_dev_kick(struct vhost_dev *dev,
return vhost_vdpa_call(dev, VHOST_SET_VRING_KICK, file);
}
static int vhost_vdpa_set_vring_dev_call(struct vhost_dev *dev,
struct vhost_vring_file *file)
{
trace_vhost_vdpa_set_vring_call(dev, file->index, file->fd);
return vhost_vdpa_call(dev, VHOST_SET_VRING_CALL, file);
}
/**
* Set the shadow virtqueue descriptors to the device
*
@ -732,6 +739,9 @@ static int vhost_vdpa_set_vring_dev_kick(struct vhost_dev *dev,
* @svq: The shadow virtqueue
* @idx: The index of the virtqueue in the vhost device
* @errp: Error
*
* Note that this function does not rewind kick file descriptor if cannot set
* call one.
*/
static bool vhost_vdpa_svq_setup(struct vhost_dev *dev,
VhostShadowVirtqueue *svq, unsigned idx,
@ -747,6 +757,14 @@ static bool vhost_vdpa_svq_setup(struct vhost_dev *dev,
r = vhost_vdpa_set_vring_dev_kick(dev, &file);
if (unlikely(r != 0)) {
error_setg_errno(errp, -r, "Can't set device kick fd");
return false;
}
event_notifier = &svq->hdev_call;
file.fd = event_notifier_get_fd(event_notifier);
r = vhost_vdpa_set_vring_dev_call(dev, &file);
if (unlikely(r != 0)) {
error_setg_errno(errp, -r, "Can't set device call fd");
}
return r == 0;
@ -872,8 +890,17 @@ static int vhost_vdpa_set_vring_kick(struct vhost_dev *dev,
static int vhost_vdpa_set_vring_call(struct vhost_dev *dev,
struct vhost_vring_file *file)
{
trace_vhost_vdpa_set_vring_call(dev, file->index, file->fd);
return vhost_vdpa_call(dev, VHOST_SET_VRING_CALL, file);
struct vhost_vdpa *v = dev->opaque;
if (v->shadow_vqs_enabled) {
int vdpa_idx = file->index - dev->vq_index;
VhostShadowVirtqueue *svq = g_ptr_array_index(v->shadow_vqs, vdpa_idx);
vhost_svq_set_svq_call_fd(svq, file->fd);
return 0;
} else {
return vhost_vdpa_set_vring_dev_call(dev, file);
}
}
static int vhost_vdpa_get_features(struct vhost_dev *dev,