Re: [PATCH RFC v3 04/12] iommu/sva: Basic data structures for SVA

[Lu Baolu]

On 2022/4/12 14:49, Tian, Kevin wrote:
> > From: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
> > Sent: Sunday, April 10, 2022 6:25 PM
> >
> > Use below data structures for SVA implementation in the IOMMU core:
> >
> > - struct iommu_sva_ioas
> >    Represent the I/O address space shared with an application CPU address
> >    space. This structure has a 1:1 relationship with an mm_struct. It
> >    graps a "mm->mm_count" refcount during creation and drop it on release.
> >
> > - struct iommu_domain (IOMMU_DOMAIN_SVA type)
> >    Represent a hardware pagetable that the IOMMU hardware could use for
> >    SVA translation. Multiple iommu domains could be bound with an SVA ioas
> >    and each graps a refcount from ioas in order to make sure ioas could
> >    only be freed after all domains have been unbound.
> >
> > - struct iommu_sva
> >    Represent a bond relationship between an SVA ioas and an iommu domain.
> >    If a bond already exists, it's reused and a reference is taken.
> >
> > Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
>
> This should be patch07. None of following patches touch those structures
> until hitting patch08.

The iommu_sva_domain_mm() helper will be used in the following patches.

Best regards,
baolu