> From: Jason Gunthorpe <j...@ziepe.ca>
> Sent: Saturday, May 11, 2024 12:29 AM
>
> On Fri, May 10, 2024 at 10:30:10PM +0800, Baolu Lu wrote:
>
> > diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> > index 35ae9a6f73d3..09b4e671dcee 100644
> > --- a/include/linux/iommu.h
> > +++ b/include/linux/iommu.h
> > @@ -173,6 +173,8 @@ struct iommu_domain_geometry {
> >
> > #define __IOMMU_DOMAIN_NESTED (1U << 6) /* User-managed address
> space
> > nested
> > on a stage-2 translation
> > */
> > +#define __IOMMU_DOMAIN_PASID (1U << 7) /* User-managed domain
> for a
> > + specific PASID*/
> >
> > #define IOMMU_DOMAIN_ALLOC_FLAGS ~__IOMMU_DOMAIN_DMA_FQ
> > /*
> > @@ -204,6 +206,9 @@ struct iommu_domain_geometry {
> > #define IOMMU_DOMAIN_SVA (__IOMMU_DOMAIN_SVA)
> > #define IOMMU_DOMAIN_PLATFORM (__IOMMU_DOMAIN_PLATFORM)
> > #define IOMMU_DOMAIN_NESTED (__IOMMU_DOMAIN_NESTED)
> > +#define IOMMU_DOMAIN_NESTED_PASID \
> > + (__IOMMU_DOMAIN_NESTED | \
> > + __IOMMU_DOMAIN_PASID)
>
> Yeah, something like that, I don't know about naming though..
>
> How about
>
> DOMAIN_NESTED = Attachment to RID or PASID
> DOMAIN_NESTED_PASID_TABLE = RID and the entire PASID space
>
this sounds clearer
