Messages in this thread | | | Date | Wed, 24 Apr 2019 16:45:32 +0200 | From | Christoph Hellwig <> | Subject | Re: [PATCH v3 02/10] swiotlb: Factor out slot allocation and free |
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On Tue, Apr 23, 2019 at 03:32:16PM +0800, Lu Baolu wrote: > When we add the bounce buffer between IOVA and physical buffer, the > bounced buffer must starts from the same offset in a page, otherwise, > IOMMU can't work here.
Why? Even with the odd hardware descriptors typical in Intel land that only allow offsets in the first page, not the following ones, having a zero offset where we previously had one should be fine.
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