linux-kernel - Re: [PATCH v1 4/9] iommu/vt-d: Add bounce buffer API for domain map/unmap

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Date:   Tue, 12 Mar 2019 09:38:45 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Joerg Roedel <joro@...tes.org>, ashok.raj@...el.com,
        jacob.jun.pan@...el.com, alan.cox@...el.com, kevin.tian@...el.com,
        mika.westerberg@...ux.intel.com, pengfei.xu@...el.com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: Re: [PATCH v1 4/9] iommu/vt-d: Add bounce buffer API for domain
 map/unmap

On Tue, Mar 12, 2019 at 02:00:00PM +0800, Lu Baolu wrote:
> This adds the APIs for bounce buffer specified domain
> map() and unmap(). The start and end partial pages will
> be mapped with bounce buffered pages instead. This will
> enhance the security of DMA buffer by isolating the DMA
> attacks from malicious devices.

Please reuse the swiotlb code instead of reinventing it.