Re: [PATCH 0/3] iommupt/vtd: Support dirty tracking on PASID

[Jason Gunthorpe]

On Wed, Feb 04, 2026 at 09:34:01PM -0500, Zhenzhong Duan wrote:
> Hi,
> 
> When we add pasid support in QEMU for passthrough device, we found
> PASID attachment to a nested parent domain with dirty tracking failed.
> 
> It's because PASID-level dirty tracking is not there yet, by adding it,
> we can enable PASID attachment to such domain.
> 
> Thanks
> Zhenzhong
> 
> 
> Zhenzhong Duan (3):
>   iommupt/vtd: Pass dmar_domain pointer to device_set_dirty_tracking()
>   iommupt/vtd: Support dirty tracking on PASID
>   iommufd/selftest: Test dirty tracking on PASID

I'm not sure why you marked this s iommupt? It isn't right?

Also only the second stage table supports dirty tracking so I'm
confused what is the issue? Is it trying to say that if a second stage
is written to a pasid entry on a !=0 pasid path it doesn't work right?
But it does work on a 0 pasid?

Huh?

That sounds like a systemic problem, the two flows shouldn't actually
be any different.

Jason