Re: [Resend RFC PATCH V2 09/12] swiotlb: Add bounce buffer remap address setting function

On Wed, Apr 14, 2021 at 10:49:42AM -0400, Tianyu Lan wrote: > From: Tianyu Lan > > 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.

[Resend RFC PATCH V2 09/12] swiotlb: Add bounce buffer remap address setting function

From: Tianyu Lan 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