在 2022/1/31 下午11:34, Eugenio Perez Martin 写道:
On Sat, Jan 29, 2022 at 9:06 AM Jason Wang <jasowang@xxxxxxxxxx> wrote:
在 2022/1/22 上午4:27, Eugenio Pérez 写道:
Signed-off-by: Eugenio Pérez <eperezma@xxxxxxxxxx>
---
hw/virtio/vhost-vdpa.c | 20 ++++++++++++++++++--
1 file changed, 18 insertions(+), 2 deletions(-)
diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index 18de14f0fb..029f98feee 100644
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -687,13 +687,29 @@ 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)
+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);
}
+static int vhost_vdpa_set_vring_call(struct vhost_dev *dev,
+ struct vhost_vring_file *file)
+{
+ struct vhost_vdpa *v = dev->opaque;
+
+ if (v->shadow_vqs_enabled) {
+ int vdpa_idx = vhost_vdpa_get_vq_index(dev, file->index);
+ VhostShadowVirtqueue *svq = g_ptr_array_index(v->shadow_vqs, vdpa_idx);
+
+ vhost_svq_set_guest_call_notifier(svq, file->fd);
Two questions here (had similar questions for vring kick):
1) Any reason that we setup the eventfd for vhost-vdpa in
vhost_vdpa_svq_setup() not here?
I'm not sure what you mean.
The guest->SVQ call and kick fds are set here and at
vhost_vdpa_set_vring_kick. The event notifier handler of the guest ->
SVQ kick_fd is set at vhost_vdpa_set_vring_kick /
vhost_svq_set_svq_kick_fd. The guest -> SVQ call fd has no event
notifier handler since we don't poll it.
On the other hand, the connection SVQ <-> device uses the same fds
from the beginning to the end, and they will not change with, for
example, call fd masking. That's why it's setup from
vhost_vdpa_svq_setup. Delaying to vhost_vdpa_set_vring_call would make
us add way more logic there.
More logic in general shadow vq code but less codes for vhost-vdpa
specific code I think.
E.g for we can move the kick set logic from vhost_vdpa_svq_set_fds() to
here.
Thanks
2) The call could be disabled by using -1 as the fd, I don't see any
code to deal with that.
Right, I didn't take that into account. vhost-kernel takes also -1 as
kick_fd to unbind, so SVQ can be reworked to take that into account
for sure.
Thanks!
Thanks
+ return 0;
+ } else {
+ return vhost_vdpa_set_vring_dev_call(dev, file);
+ }
+}
+
/**
* Set shadow virtqueue descriptors to the device
*
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