diff options
| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2023-03-12 14:25:58 +0300 |
|---|---|---|
| committer | Dave Hansen <dave.hansen@linux.intel.com> | 2023-03-16 23:08:39 +0300 |
| commit | 6449dcb0cac738219d13c618af7fd8664735f99d (patch) | |
| tree | 246add8daa2a0ee4ab493b3a91c81bb0a4063ebd /arch/x86/include/asm/processor-flags.h | |
| parent | 5ef495e55f07aa117fdd8e187c9901cefc02fe0a (diff) | |
| download | linux-6449dcb0cac738219d13c618af7fd8664735f99d.tar.xz | |
x86: CPUID and CR3/CR4 flags for Linear Address Masking
Enumerate Linear Address Masking and provide defines for CR3 and CR4
flags.
The new CONFIG_ADDRESS_MASKING option enables the feature support in
kernel.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Alexander Potapenko <glider@google.com>
Link: https://lore.kernel.org/all/20230312112612.31869-4-kirill.shutemov%40linux.intel.com
Diffstat (limited to 'arch/x86/include/asm/processor-flags.h')
| -rw-r--r-- | arch/x86/include/asm/processor-flags.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/include/asm/processor-flags.h b/arch/x86/include/asm/processor-flags.h index a7f3d9100adb..d8cccadc83a6 100644 --- a/arch/x86/include/asm/processor-flags.h +++ b/arch/x86/include/asm/processor-flags.h @@ -28,6 +28,8 @@ * On systems with SME, one bit (in a variable position!) is stolen to indicate * that the top-level paging structure is encrypted. * + * On systemms with LAM, bits 61 and 62 are used to indicate LAM mode. + * * All of the remaining bits indicate the physical address of the top-level * paging structure. * |