linux-kernel - Re: [PATCH 2/2] iommu/vt-d: Replace intel SVM APIs with generic SVA APIs

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Message-ID: <20200226073127.GA438595@myrica>
Date:   Wed, 26 Feb 2020 08:31:27 +0100
From:   Jean-Philippe Brucker <jean-philippe@...aro.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>
Subject: Re: [PATCH 2/2] iommu/vt-d: Replace intel SVM APIs with generic SVA
 APIs

On Tue, Feb 25, 2020 at 11:10:34AM -0800, Christoph Hellwig wrote:
> On Mon, Feb 24, 2020 at 03:26:37PM -0800, Jacob Pan wrote:
> > This patch is an initial step to replace Intel SVM code with the
> > following IOMMU SVA ops:
> > intel_svm_bind_mm() => iommu_sva_bind_device()
> > intel_svm_unbind_mm() => iommu_sva_unbind_device()
> > intel_svm_is_pasid_valid() => iommu_sva_get_pasid()
> 
> How did either set APIs end up being added to the kernel without users
> to start with?
> 
> Please remove both the old intel and the iommu ones given that neither
> has any users.

The hisilicon crypto accelerator will be using the new API in v5.7
https://lore.kernel.org/linux-iommu/1581407665-13504-1-git-send-email-zhangfei.gao@linaro.org/

Thanks,
Jean