On 5/6/24 12:43 PM, Jason Gunthorpe wrote: > On Sat, May 04, 2024 at 12:33:53AM +0530, Shivaprasad G Bhat wrote: >> We have legacy workloads using VFIO in userspace/kvm guests running >> on downstream distro kernels. We want these workloads to be able to >> continue running on our arch. > > It has been broken since 2018, I don't find this reasoning entirely > reasonable :\ > Raptor is currently working on an automated test runner setup to exercise the VFIO subsystem on PowerNV and (to a lesser extent) pSeries, so breakages like this going forward will hopefully be caught much more quickly. >> I firmly believe the refactoring in this patch series is a step in >> that direction. > > But fine, as long as we are going to fix it. PPC really needs this to > be resolved to keep working. > Agreed. Modernizing/de-cluttering PPC's IOMMU code in general is another task that we're working towards. As mentioned previously on the list, we're working towards a more standard IOMMU driver for PPC that can be used with dma_iommu, which I think will be a good step towards cleaning this up. Initially PowerNV is going to be our target, but to the extent that it is possible and useful, pSeries support could be brought in later. > Jason Thanks, Shawn
