Messages in this thread Patch in this message | | | From | Thomas Hellström (VMware) <> | Subject | [PATCH 2/2] dma-mapping: Fix dma_pgprot() for unencrypted coherent pages | Date | Tue, 10 Sep 2019 15:35:42 +0200 |
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From: Thomas Hellstrom <thellstrom@vmware.com>
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.
Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Christian König <christian.koenig@amd.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Cc: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> --- kernel/dma/mapping.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index b0038ca3aa92..2b499dcae74f 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -157,6 +157,8 @@ EXPORT_SYMBOL(dma_get_sgtable_attrs); */ pgprot_t dma_pgprot(struct device *dev, pgprot_t prot, unsigned long attrs) { + if (force_dma_unencrypted(dev)) + prot = pgprot_decrypted(prot); if (dev_is_dma_coherent(dev) || (IS_ENABLED(CONFIG_DMA_NONCOHERENT_CACHE_SYNC) && (attrs & DMA_ATTR_NON_CONSISTENT))) -- 2.20.1
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