Re: [virtio-dev] [PATCH 08/11] transport-pci: Introduce virtio extended capability

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

On Tue, Apr 11, 2023 at 09:47:50AM -0400, Parav Pandit wrote:
> 
> 
> On 4/11/2023 3:00 AM, Michael S. Tsirkin wrote:
> 
> > > I meant, it depends on the capability semantics. Both PASID and legacy
> > > MMIO don't need to be accessed by BIOS. We can't change legacy BIOS to
> > > use legacy MMIO bars.
> > > 
> > > Thanks
> > 
> > makes sense.
> > 
> > 
> > now, imagine someone building a new device. if existing drivers are not
> > a concern, it is possible to move capabilities all to extended space. is
> > that possible while keeping the bios working?
> > 
> unlikely as bios is looking in the legacy section.

what do you mean by the legacy section?

> New capabilities like legacy (and pasid) has no backward compat requirement
> from bios and drivers.
> so they can start from new.

sure.

-- 
MST