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

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Date:   Wed, 24 Mar 2021 15:25:55 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     baolu.lu@...ux.intel.com, 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

Hi Christoph,

On 3/24/21 1:33 AM, Christoph Hellwig wrote:
> 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>

Thank you!

> 
> 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/.
> 

Sure. I will consider it and make it in separated patches.

Best regards,
baolu