Re: [PATCH 1/1] iommu/vt-d: Only handle IOPF for SVA when PRI is supported

[Baolu Lu]

On 3/10/2026 3:55 PM, Lu Baolu wrote:
> In intel_svm_set_dev_pasid(), the driver unconditionally manages the IOPF
> handling during a domain transition. However, commit a86fb7717320
> ("iommu/vt-d: Allow SVA with device-specific IOPF") introduced support for
> SVA on devices that handle page faults internally without utilizing the
> PCI PRI. On such devices, the IOMMU-side IOPF infrastructure is not
> required. Calling iopf_for_domain_replace() on these devices is incorrect
> and can lead to unexpected failures during PASID attachment or unwinding.
>
> Add a check for info->pri_supported to ensure that the IOPF queue logic
> is only invoked for devices that actually rely on the IOMMU's PRI-based
> fault handling.
>
> Fixes: 17fce9d2336d ("iommu/vt-d: Put iopf enablement in domain attach path")
> Cc:stable@xxxxxxxxxxxxxxx
> Suggested-by: Kevin Tian<kevin.tian@xxxxxxxxx>
> Signed-off-by: Lu Baolu<baolu.lu@xxxxxxxxxxxxxxx>
> ---
>   drivers/iommu/intel/svm.c | 12 ++++++++----
>   1 file changed, 8 insertions(+), 4 deletions(-)

Queued for v7.0-rc.