On 5/2/23 9:28 AM, David Hildenbrand wrote: > On 02.05.23 15:10, Jason Gunthorpe wrote: >> On Tue, May 02, 2023 at 03:04:27PM +0200, Christian Borntraeger wrote: >> \> > We can reintroduce a flag to permit exceptions if this is really broken, are you >>>> able to test? I don't have an s390 sat around :) >>> >>> Matt (Rosato on cc) probably can. In the end, it would mean having >>> <memoryBacking> >>> <source type="file"/> >>> </memoryBacking> >> >> This s390 code is the least of the problems, after this series VFIO >> won't startup at all with this configuration. > > Good question if the domain would fail to start. I recall that IOMMUs for zPCI are special on s390x. [1] Eh, well what you referenced there never merged. We will eventually do something like this, but via iommufd. But right now s390 is still using vfio type1 iommu > > Well, zPCI is special. I cannot immediately tell when we would trigger long-term pinning. Enabling a zPCI device in a QEMU guest when using zPCI interpretation facilities > > [1] https://www.mail-archive.com/qemu-devel@xxxxxxxxxx/msg875728.html >
