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

Parav Pandit
2023-04-11T14:07:34Z

> From: virtio-comment@lists.oasis-open.org <virtio-comment@lists.oasis-
> open.org> On Behalf Of Michael S. Tsirkin

> > >
> > > 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?
>
Existing virtio PCI capabilities which are in the PCI capabilities region in first 256 bytes of the PCI config space.

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