Thomas Hellstrom e88ee287fd dma-mapping: Fix dma_pgprot() for unencrypted coherent pages ... [ Upstream commit 17c4a2ae15 ] When dma_mmap_coherent() sets up a mapping to unencrypted coherent memory under SEV encryption and sometimes under SME encryption, it will actually set up an encrypted mapping rather than an unencrypted, causing devices that DMAs from that memory to read encrypted contents. Fix this. When force_dma_unencrypted() returns true, the linear kernel map of the coherent pages have had the encryption bit explicitly cleared and the page content is unencrypted. Make sure that any additional PTEs we set up to these pages also have the encryption bit cleared by having dma_pgprot() return a protection with the encryption bit cleared in this case. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Acked-by: Tom Lendacky <thomas.lendacky@amd.com> Link: https://lkml.kernel.org/r/20200304114527.3636-3-thomas_os@shipmail.org Signed-off-by: Sasha Levin <sashal@kernel.org>		2020-04-17 10:50:01 +02:00
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coherent.c	dma-mapping: fix handling of dma-ranges for reserved memory (again)	2020-01-04 19:17:00 +01:00
contiguous.c	dma-direct: fix zone selection after an unaddressable CMA allocation	2019-08-21 07:14:10 +09:00
debug.c	dma-debug: add a schedule point in debug_dma_dump_mappings()	2020-01-04 19:16:57 +01:00
direct.c	dma-direct: don't check swiotlb=force in dma_direct_map_resource	2020-01-26 10:01:08 +01:00
dummy.c	dma-mapping: factor out dummy DMA ops	2018-12-13 21:06:12 +01:00
Kconfig	dma-mapping: remove arch_dma_mmap_pgprot	2019-08-29 16:43:22 +02:00
Makefile	dma-mapping: improve selection of dma_declare_coherent availability	2019-02-20 07:26:35 -07:00
mapping.c	dma-mapping: Fix dma_pgprot() for unencrypted coherent pages	2020-04-17 10:50:01 +02:00
remap.c	dma-mapping: fix false positivse warnings in dma_common_free_remap()	2019-10-05 10:24:17 +02:00
swiotlb.c	powerpc updates for 5.4	2019-09-20 11:48:06 -07:00
virt.c	dma-mapping: zero memory returned from dma_alloc_*	2018-12-20 08:13:52 +01:00