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

[Jean-Philippe Brucker]

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