RE: [PATCH v5 3/9] iommu: Add attachment handle to struct iopf_group

[Tian, Kevin]

> From: Jason Gunthorpe <jgg@xxxxxxxx>
> 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