Re: [PATCH v3 02/16] iommu: Introduce cache_invalidate API

Jean-Philippe Brucker
2019-05-13T17:10:15Z

On 13/05/2019 17:50, Auger Eric wrote:
>> struct iommu_inv_pasid_info {
>> #define IOMMU_INV_PASID_FLAGS_PASID (1 << 0)
>> #define IOMMU_INV_PASID_FLAGS_ARCHID (1 << 1)
>> __u32 flags;
>> __u32 archid;
>> __u64 pasid;
>> };
> I agree it does the job now. However it looks a bit strange to do a
> PASID based invalidation in my case - SMMUv3 nested stage - where I
> don't have any PASID involved.
>
> Couldn't we call it context based invalidation then? A context can be
> tagged by a PASID or/and an ARCHID.

I think calling it "context" would be confusing as well (I shouldn't
have used it earlier), since VT-d uses that name for device table
entries (=STE on Arm SMMU). Maybe "addr_space"?

Thanks,
Jean

>
> Domain invalidation would invalidate all the contexts belonging to that
> domain.
>
> Thanks
>
> Eric