linux-kernel - Re: [PATCH v3 02/16] iommu: Introduce cache

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Date:   Mon, 13 May 2019 18:09:48 +0100
From:   Jean-Philippe Brucker <jean-philippe.brucker@....com>
To:     Auger Eric <eric.auger@...hat.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Alex Williamson <alex.williamson@...hat.com>
Cc:     "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Andriy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH v3 02/16] iommu: Introduce cache_invalidate API

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