Re: [virtio-dev] Re: [PATCH 0/5] virtio: introduce SUSPEND bit and vq state

Jason Wang
2023-09-21T04:02:43Z

On Thu, Sep 21, 2023 at 11:51 AM Parav Pandit <parav@nvidia.com> wrote:
>
>
>
> > From: Jason Wang <jasowang@redhat.com>
> > Sent: Thursday, September 21, 2023 8:45 AM
> > The main issue I see so far is that
> > you want to couple migration with admin commands but I don't see much
> > advantages to doing this.
> >
> The way I read above comment is, to draw a parallel line: descriptor posting in virtio spec is tied to virtqueues. What is the advantage of it?

Are you saying virtio can't live without admin commands? Again, let's
not shift concepts.

> Well, it is one way to achieve it.
> There may be different way to do all bulk data transfer without admin commands.

Why is virtqueue the only way to do bulk data transferring? Can't DMA
be initiated by other-way?

Thanks

> What it the advantage of it, please list down them in [1] for the command where you can find alternative.
>
> [1] https://lore.kernel.org/virtio-comment/20230909142911.524407-7-parav@nvidia.com/T/#md9fcfa1ba997463de8c7fb8c6d1786b224b0bead