On 02.05.23 15:36, Jason Gunthorpe wrote:
On Tue, May 02, 2023 at 03:28:40PM +0200, 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]
Not upstream they aren't.
Well, zPCI is special. I cannot immediately tell when we would trigger
long-term pinning.
zPCI uses the standard IOMMU stuff, so it uses a normal VFIO container
and the normal pin_user_pages() path.
@Christian, Matthew: would we pin all guest memory when starting the
domain (IIRC, like on x86-64) and fail early, or only when the guest
issues rpcit instructions to map individual pages?
--
Thanks,
David / dhildenb
