diff options
| author | Arvind Sankar <nivedita@alum.mit.edu> | 2020-11-11 19:09:45 +0300 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2020-12-10 14:28:06 +0300 |
| commit | 29ac40cbed2bc06fa218ca25d7f5e280d3d08a25 (patch) | |
| tree | c65f56747f027d92cd6ed6e9c4c484f6f2b8ed7c /arch/x86/mm | |
| parent | e45cdc71d1fa5ac3a57b23acc31eb959e4f60135 (diff) | |
| download | linux-29ac40cbed2bc06fa218ca25d7f5e280d3d08a25.tar.xz | |
x86/mm/mem_encrypt: Fix definition of PMD_FLAGS_DEC_WP
The PAT bit is in different locations for 4k and 2M/1G page table
entries.
Add a definition for _PAGE_LARGE_CACHE_MASK to represent the three
caching bits (PWT, PCD, PAT), similar to _PAGE_CACHE_MASK for 4k pages,
and use it in the definition of PMD_FLAGS_DEC_WP to get the correct PAT
index for write-protected pages.
Fixes: 6ebcb060713f ("x86/mm: Add support to encrypt the kernel in-place")
Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Signed-off-by: Borislav Petkov <bp@suse.de>
Tested-by: Tom Lendacky <thomas.lendacky@amd.com>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20201111160946.147341-1-nivedita@alum.mit.edu
Diffstat (limited to 'arch/x86/mm')
| -rw-r--r-- | arch/x86/mm/mem_encrypt_identity.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/mm/mem_encrypt_identity.c b/arch/x86/mm/mem_encrypt_identity.c index 733b983f3a89..6c5eb6f3f14f 100644 --- a/arch/x86/mm/mem_encrypt_identity.c +++ b/arch/x86/mm/mem_encrypt_identity.c @@ -45,8 +45,8 @@ #define PMD_FLAGS_LARGE (__PAGE_KERNEL_LARGE_EXEC & ~_PAGE_GLOBAL) #define PMD_FLAGS_DEC PMD_FLAGS_LARGE -#define PMD_FLAGS_DEC_WP ((PMD_FLAGS_DEC & ~_PAGE_CACHE_MASK) | \ - (_PAGE_PAT | _PAGE_PWT)) +#define PMD_FLAGS_DEC_WP ((PMD_FLAGS_DEC & ~_PAGE_LARGE_CACHE_MASK) | \ + (_PAGE_PAT_LARGE | _PAGE_PWT)) #define PMD_FLAGS_ENC (PMD_FLAGS_LARGE | _PAGE_ENC) |