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[RFC,v1,13/28] iommu/amd: AMD IOMMU support for SEV

Message ID 147190837333.9523.16962214308407411754.stgit@brijesh-build-machine (mailing list archive)
State Not Applicable
Delegated to: Herbert Xu
Headers show

Commit Message

Brijesh Singh Aug. 22, 2016, 11:26 p.m. UTC 
From: Tom Lendacky <thomas.lendacky@amd.com>

DMA must be performed to memory that is not mapped encrypted when running
with SEV active. So if SEV is active, do not return the encryption mask
to the IOMMU.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
---
 arch/x86/mm/mem_encrypt.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)


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diff mbox

Patch

diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
index ce6e3ea..d6e9f96 100644
--- a/arch/x86/mm/mem_encrypt.c
+++ b/arch/x86/mm/mem_encrypt.c
@@ -237,7 +237,7 @@  void __init mem_encrypt_init(void)
 
 unsigned long amd_iommu_get_me_mask(void)
 {
-	return sme_me_mask;
+	return sev_active ? 0 : sme_me_mask;
 }
 
 unsigned long swiotlb_get_me_mask(void)