On Tue, 9 Jun 2020 18:05:59 +0200 Cornelia Huck <coh...@redhat.com> wrote:
> Which devices are compatible in the end? It seems the only ones that > are known to be working are virtio-ccw devices with IOMMU_PLATFORM on. > virtio-pci devices and non-virtio ccw (vfio-ccw, 3270) seem to be out, > as far as I understand it. What about non-ccw? PCI in general, vfio-ap? I've already answered how virtio is special. Regarding PCI, it is currently not supported in prot virt mode, and this is properly handled by the ultravisor: facility bits fenced and operation exceptions indicated if the guest were to try and do PCI instructions nevertheless. That also means we don't have to worry about virtio-pci for the moment. The status current of AP is analogous to that of PCI. So AFAIU all we have to worry about at the moment is ccw and virtio-ccw. Regards, Halil
