RE: [virtio-comment] [PATCH 5/5] virtio-pci: implement VIRTIO_F_QUEUE_STATE

[Parav Pandit <parav@nvidia.com>]

> From: virtio-comment@lists.oasis-open.org <virtio-comment@lists.oasis-
> open.org> On Behalf Of Michael S. Tsirkin
> Sent: Wednesday, September 6, 2023 2:03 PM
> To: Zhu Lingshan <lingshan.zhu@intel.com>
> Cc: jasowang@redhat.com; eperezma@redhat.com; cohuck@redhat.com;
> stefanha@redhat.com; virtio-comment@lists.oasis-open.org; virtio-
> dev@lists.oasis-open.org
> Subject: Re: [virtio-comment] [PATCH 5/5] virtio-pci: implement
> VIRTIO_F_QUEUE_STATE
> 
> On Wed, Sep 06, 2023 at 04:16:37PM +0800, Zhu Lingshan wrote:
> > This patch adds two new le16 fields to common configuration structure
> > to support VIRTIO_F_QUEUE_STATE in PCI transport layer.
> >
> > Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com>
> 
> 
> I do not see why this would be pci specific at all.
> 
> But besides I thought work on live migration will use admin queue. This was
> explicitly one of the motivators.
> 
> Poking at the device from the driver to migrate it is not going to work if the
> driver lives within guest.

Exactly.
I was not paying attention to this thread as we have AQ based proposal for the passthrough device.
It leverages many idea of what Si-Wei presented in KVM forum 2022.
I will post the first draft in few days.