RE: [PATCH v2 3/5] iommu/vt-d: Move iopf code from SVA to IOPF enabling path

[Tian, Kevin]

> From: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
> Sent: Thursday, March 9, 2023 10:57 AM
> 
> Generally enabling IOMMU_DEV_FEAT_SVA requires
> IOMMU_DEV_FEAT_IOPF, but
> some devices manage I/O Page Faults themselves instead of relying on the
> IOMMU. Move IOPF related code from SVA to IOPF enabling path.
> 
> For the device drivers that relies on the IOMMU for IOPF through PCI/PRI,
> IOMMU_DEV_FEAT_IOPF must be enabled before and disabled after
> IOMMU_DEV_FEAT_SVA.
> 
> Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>