[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v4 19/21] xen/arm: grant: Add another entry to map MFN 1:1 in dom0 p2m
On Tue, 2014-04-22 at 14:14 +0100, Julien Grall wrote: > Grant mapping can be used for DMA request. The dev_bus_addr returned by the > hypercall is the MFN (not the IPA). Currently Linux is using this address (via > swiotlb) to program the DMA. > When the device is protected by IOMMU the request will fail. We have to > add 1:1 mapping in the domain p2m to allow DMA request working. > > This is valid because DOM0 has its memory mapped 1:1. Go on to say: ... and therefore we know that RAM and devices cannot clash (or something). > Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx> With that: Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx> _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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