Re: [PATCH v2 0/4] vfio-pci support pasid attach/detach

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On Wed, Apr 24, 2024 at 02:57:38AM +0000, Tian, Kevin wrote:
> Now those shared capabilities are enabled/disabled when the PF is
> attached to/detached from a domain, w/o counting the shared usage
> from VFs.


This looks broken in the kernel right now?

If you attach a SVA PASID to a VF then the iommu driver will call 
pci_enable_pri(vf) which will always fail:

	 * VFs must not implement the PRI Capability.  If their PF
	 * implements PRI, it is shared by the VFs, so if the PF PRI is
	 * enabled, it is also enabled for the VF.
	if (pdev->is_virtfn) {
		if (pci_physfn(pdev)->pri_enabled)
			return 0;
		return -EINVAL;

More to fix :(


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