From: Lu Baolu <baolu.lu-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
To: Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Cc: kevin.tian-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org,
mika.westerberg-VuQAYsv1563Yd54FQh9/CA@public.gmane.org,
ashok.raj-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org,
alan.cox-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
pengfei.xu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org,
jacob.jun.pan-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org,
David Woodhouse <dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Subject: Re: [PATCH v1 4/9] iommu/vt-d: Add bounce buffer API for domain map/unmap
Date: Thu, 14 Mar 2019 09:01:16 +0800 [thread overview]
Message-ID: <b3e88984-d2ff-c23d-c4bd-3248e4e9487d@linux.intel.com> (raw)
In-Reply-To: <20190313161029.GA23513-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Hi,
On 3/14/19 12:10 AM, Christoph Hellwig wrote:
> On Wed, Mar 13, 2019 at 10:31:52AM +0800, Lu Baolu wrote:
>> Hi again,
>>
>> On 3/13/19 10:04 AM, Lu Baolu wrote:
>>> Hi,
>>>
>>> On 3/13/19 12:38 AM, Christoph Hellwig wrote:
>>>> 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.
>>>>
>>
>> Just looked into the code again. At least we could reuse below
>> functions:
>>
>> swiotlb_tbl_map_single()
>> swiotlb_tbl_unmap_single()
>> swiotlb_tbl_sync_single()
>>
>> Anything else?
>
> Yes, that is probably about the level you want to reuse, given that the
> next higher layer already has hooks into the direct mapping code.
>
Okay. Thank you!
I will try to make this happen in v2.
Best regards,
Lu Baolu
next prev parent reply other threads:[~2019-03-14 1:01 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-12 5:59 [PATCH v1 0/9] Bounce buffer for untrusted devices Lu Baolu
2019-03-12 5:59 ` [PATCH v1 1/9] iommu/vt-d: Add trace events for domain map/unmap Lu Baolu
2019-03-12 5:59 ` [PATCH v1 2/9] iommu/vt-d: Add helpers for domain mapping/unmapping Lu Baolu
2019-03-12 5:59 ` [PATCH v1 3/9] iommu/vt-d: Add address walk helper Lu Baolu
[not found] ` <20190312060005.12189-1-baolu.lu-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2019-03-12 6:00 ` [PATCH v1 4/9] iommu/vt-d: Add bounce buffer API for domain map/unmap Lu Baolu
2019-03-12 16:38 ` Christoph Hellwig
2019-03-13 2:04 ` Lu Baolu
[not found] ` <e653341d-e001-7262-740b-2262842be06d-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2019-03-13 2:31 ` Lu Baolu
[not found] ` <c9fe7879-569e-b4f4-d6ec-47ab7e6fd443-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2019-03-13 16:10 ` Christoph Hellwig
[not found] ` <20190313161029.GA23513-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2019-03-14 1:01 ` Lu Baolu [this message]
2019-03-19 7:59 ` Lu Baolu
2019-03-19 11:21 ` Robin Murphy
2019-03-12 6:00 ` [PATCH v1 5/9] iommu/vt-d: Add bounce buffer API for dma sync Lu Baolu
2019-03-12 6:00 ` [PATCH v1 6/9] iommu/vt-d: Check whether device requires bounce buffer Lu Baolu
2019-03-12 6:00 ` [PATCH v1 7/9] iommu/vt-d: Add dma sync ops for untrusted devices Lu Baolu
2019-03-12 6:00 ` [PATCH v1 8/9] iommu/vt-d: Flush IOTLB for untrusted device in time Lu Baolu
2019-03-12 6:00 ` [PATCH v1 9/9] iommu/vt-d: Use bounce buffer for untrusted devices Lu Baolu
2019-03-12 6:07 ` [PATCH v1 0/9] Bounce " Lu Baolu
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