Re: [PATCH v4 10/18] PCI: Account for ACS egress control in isolation checks

[Leon Romanovsky]

On Mon, Aug 24, 2026 at 08:22:50PM -0300, Jason Gunthorpe wrote:
> > pci_acs_enabled() treats P2P Request Redirect as effective whenever its
> > control bit is set. PCIe r7.0, sec 6.12.3, table 6-11 lets an enabled
> > Egress Control Vector override it: a clear vector bit routes the request
> > directly.
> 
> This may well all be correct, but I'd prefer not to touch grouping in
> this series working on p2pdma.. The grouping logic is already not
> doing a good job with the spec and we can't change it because it
> creates regression.

The longer we wait, the harder it will be to address this deviation
from the PCI specification.

Thanks

> 
> -- 
> Jason