Re: [virtio-comment] Re: [PATCH V2 4/6] virtio-pci: implement VIRTIO_F_QUEUE_STATE

[Jason Wang <jasowang@redhat.com>]

On Wed, Nov 22, 2023 at 12:26âAM Parav Pandit <parav@nvidia.com> wrote:
>
>
> > From: Jason Wang <jasowang@redhat.com>
> > Sent: Tuesday, November 21, 2023 10:01 AM
> >
> > On Fri, Nov 17, 2023 at 6:06âPM Parav Pandit <parav@nvidia.com> wrote:
> > >
> > >

[...]

> > > Sorry, no virtio specification does not support device migration today.
> > > Nothing is broken by adding new features.
> > >
> > > Above [1] has the right proposal that Jason's paper pointed out. Please use
> > it.
> >
> > I was involved in the design in [1]. And I don't see a connection to the
> > dicussion here
> >
> > 1) It is based on vDPA in L0
> > 2) It doesn't address the nesting issue, it requires a proper design in the virtio
> > spec to support migration in the nesting layer.
>
> Nothing prevents [1] to be done without vdpa.

Well, Qemu has SR-IOV emulation for IGB. What's the point of the above
reply? If a hypervisor wishes, it can be done with any device on L0.

We discuss the possibility of migrating nested VMs, not the
possibility of emulating SR-IOV, no?

Thanks