Re: [PATCH v3 5/5] pci: Suspend iommu function prior to resetting a device

Jason Gunthorpe
2025-08-21T13:07:49Z

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...

Arguably if the PF is reset the VFs should have their translations
blocked too.

Jason