On 2020/6/2 下午1:09, Michael S. Tsirkin wrote:

On Fri, May 29, 2020 at 04:03:02PM +0800, Jason Wang wrote:

quoted

Note that since virtio specification does not support get/restore
virtqueue state. So we can not use this driver for VM. This can be
addressed by extending the virtio specification.

Looks like exactly the kind of hardware limitation VDPA is supposed to
paper over within guest. So I suggest we use this as
a litmus test, and find ways for VDPA to handle this without
spec changes.

Yes, and just to confirm, do you think it's beneficial to extend virtio 
specification to support state get/set?

Thanks