On Thu, Aug 21, 2025 at 10:07:41AM -0300, Jason Gunthorpe wrote: > On Tue, Aug 19, 2025 at 02:59:07PM -0700, Nicolin Chen wrote: > > c) multiple pci_devs with their own RIDs > > > > In this case, either FLR or IOMMU only resets the PF. That > > being said, VFs might be affected since PF is resetting? > > If there is an issue, I don't see it coming from the IOMMU- > > level reset.. > > It would still allow the ATS issue from the VF side. The VF could be > pushing an invalidation during the PF reset that will get clobbered. > > I haven't fully checked but I think Linux doesn't really (easially?) > allow resetting a PF while a VF is present... Hmm, what if the PF encountered some fault? Does Linux have a choice not to reset PF? > Arguably if the PF is reset the VFs should have their translations > blocked too. Yea, that sounds plausible to me. But, prior to that (an IOMMU-level reset), should VFs be first reset at the PCI level? Thanks Nicolin
