| Date | Mon, 7 Jun 2021 08:43:12 +0200 | From | Christoph Hellwig <> | Subject | Re: [RFC PATCH V3 08/11] swiotlb: Add bounce buffer remap address setting function |
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On Sun, May 30, 2021 at 11:06:25AM -0400, Tianyu Lan wrote: > From: Tianyu Lan <Tianyu.Lan@microsoft.com> > > For Hyper-V isolation VM with AMD SEV SNP, the bounce buffer(shared memory) > needs to be accessed via extra address space(e.g address above bit39). > Hyper-V code may remap extra address space outside of swiotlb. swiotlb_ > bounce() needs to use remap virtual address to copy data from/to bounce > buffer. Add new interface swiotlb_set_bounce_remap() to do that.
Why can't you use the bus_dma_region ranges to remap to your preferred address?
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