Re: [Qemu-devel] [PATCH] virtio-pci: Add subsystem-vendor-id property

[Michael S. Tsirkin]

On Wed, Dec 13, 2017 at 10:07:12AM +0000, Stefan Hajnoczi wrote:
> On Wed, Dec 13, 2017 at 12:26:44AM -0800, Ben Warren via Qemu-devel wrote:
> > From: Ben Warren <address@hidden>
> > 
> > Now that virtio-win guest drivers provided by non-Redhat vendors need to
> > use a different Subsystem Vendor ID value, a way is needed to set this
> > parameter on the host.  This works with all of the PCI-based devices,
> > such as NetKVM, viostor, vioscsi, vioserial and balloon.
> > 
> > Signed-off-by: Ben Warren <address@hidden>
> > ---
> >  hw/virtio/virtio-pci.c | 5 +++++
> >  hw/virtio/virtio-pci.h | 1 +
> >  2 files changed, 6 insertions(+)
> 
> Is it possible to put this property in hw/pci/pci.c:pci_props[] so that
> users can override the Subsystem Vendor ID for any PCI adapter, not just
> virtio-pci?

The difficulty is that some devices override the ID you would set,
and there's no way for management to find out.
So I think virtio is preferable for now.