Messages in this thread | | | Subject | Re: [PATCH v1 4/9] iommu/vt-d: Add bounce buffer API for domain map/unmap | From | Lu Baolu <> | Date | Thu, 14 Mar 2019 09:01:16 +0800 |
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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
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