RE: [PATCH v2 3/4] iommupt/vtd: Support dirty tracking on PASID

[Tian, Kevin]

> From: Duan, Zhenzhong <zhenzhong.duan@xxxxxxxxx>
> Sent: Monday, March 30, 2026 6:11 PM
> 
> In order to support passthrough device with PASID capability in QEMU,
> e.g., DSA device, kernel needs to support attaching PASID to a domain.
> 
> But attaching is not allowed if the domain is a second stage domain or
> nested domain with dirty tracking.
> 
> The reason is kernel lacking support for dirty tracking on such domain
> attached to PASID. By adding dirty tracking on PASID, the check can be
> removed.
> 
> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@xxxxxxxxx>
> Reviewed-by: Yi Liu <yi.l.liu@xxxxxxxxx>

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