Re: [virtio-comment] [PATCH requirements 1/7] net-features: Add requirements document for release 1.4

["Michael S. Tsirkin" <mst@redhat.com>]

On Wed, Jun 07, 2023 at 08:39:11PM +0000, Parav Pandit wrote:
> 
> 
> > From: Michael S. Tsirkin <mst@redhat.com>
> > Sent: Wednesday, June 7, 2023 4:36 PM
> > 
> > On Tue, Jun 06, 2023 at 11:08:12PM +0000, Parav Pandit wrote:
> > > We can debate and change from cvq to new cfgvq as part of the journey.
> > > It is fine.
> > 
> > Just to stress, cvq has a bunch of drawbacks. For example it is hard to access
> > from the hypervisor since it's DMA from VF.
> > This is why I think our direction should be to add a vq transport that does all
> > config accesses over admin commands.
> We debate this before, so will write is below.
> > Or maybe I'm wrong.
> > 
> 
> > But, let's distinguish between requirements, and between requirements and
> > design. Getting supported counters is a requirement.
> > Doing this over cvq is a design. Reducing MMIO registers is a requirement. OK?
> 
> Yes, I would write it as reducing MMIO and accessing it over vq of the own device is a requirement.

reducing mmio is a requirement (unrelated to counters btw, it's
general). access over vq is a design point I think.

-- 
MST


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