[PATCH v4 1/5] PCI/ATS: Ensure pci_ats_supported() is PF-aware for VFs

[Nicolin Chen]

On Mon, May 25, 2026 at 06:43:43PM +0000, Pranjal Shrivastava wrote:
> Update pci_ats_supported() to additionally check the associated PF's
> status when called on a VF. This ensures that PF-level quirks and
> untrusted status are correctly propagated to VFs, providing a robust
> support check that aligns with the kernel's PF-centric ATS configuration
> model and is immune to the timing of VF-specific fixups.
> 
> Reviewed-by: Jason Gunthorpe <jgg at nvidia.com>
> Reviewed-by: Samiullah Khawaja <skhawaja at google.com>
> Signed-off-by: Pranjal Shrivastava <praan at google.com>

Reviewed-by: Nicolin Chen <nicolinc at nvidia.com>