linux-kernel - Re: [PATCH 3/5] iommu/vt-d: Remove SVM_FLAG_PRIVATE

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Date:   Tue, 23 Mar 2021 17:33:57 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        ashok.raj@...el.com, kevin.tian@...el.com, jacob.jun.pan@...el.com,
        yi.l.liu@...el.com, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] iommu/vt-d: Remove SVM_FLAG_PRIVATE_PASID

On Tue, Mar 23, 2021 at 09:05:58AM +0800, Lu Baolu wrote:
> The SVM_FLAG_PRIVATE_PASID has never been referenced in the tree, and
> there's no plan to have anything to use it. So cleanup it.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>

Looks good,

Reviewed-by: Christoph Hellwig <hch@....de>

But can we take this a little further?  SVM_FLAG_GUEST_PASID is unused
as well.  SVM_FLAG_GUEST_MODE is only used in drivers/iommu/intel/svm.c,
and SVM_FLAG_SUPERVISOR_MODE is actually used as an API flag to
iommu_sva_bind_device.  So IMHO the latter should be elevated to an
IOMMU API level flag, and then include/linux/intel-svm.h can go away
entirely or at least be moved to drivers/iommu/intel/.