diff options
| author | Xin Li <xin3.li@intel.com> | 2023-12-05 02:49:50 -0800 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2024-01-25 19:10:29 +0100 |
| commit | a4cb5ece145828cae35503857debf3d49c9d1c5f (patch) | |
| tree | c6fdc9b00cc4efc65f4ff43574809df8e7fa3d0f /arch/x86/lib | |
| parent | 6613476e225e090cc9aad49be7fa504e290dd33d (diff) | |
| download | linux-a4cb5ece145828cae35503857debf3d49c9d1c5f.tar.gz linux-a4cb5ece145828cae35503857debf3d49c9d1c5f.tar.bz2 linux-a4cb5ece145828cae35503857debf3d49c9d1c5f.zip | |
x86/cpufeatures,opcode,msr: Add the WRMSRNS instruction support
WRMSRNS is an instruction that behaves exactly like WRMSR, with
the only difference being that it is not a serializing instruction
by default. Under certain conditions, WRMSRNS may replace WRMSR to
improve performance.
Add its CPU feature bit, opcode to the x86 opcode map, and an
always inline API __wrmsrns() to embed WRMSRNS into the code.
Signed-off-by: Xin Li <xin3.li@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Shan Kang <shan.kang@intel.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Acked-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20231205105030.8698-2-xin3.li@intel.com
Diffstat (limited to 'arch/x86/lib')
| -rw-r--r-- | arch/x86/lib/x86-opcode-map.txt | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/lib/x86-opcode-map.txt b/arch/x86/lib/x86-opcode-map.txt index 5168ee0360b2..1efe1d9bf5ce 100644 --- a/arch/x86/lib/x86-opcode-map.txt +++ b/arch/x86/lib/x86-opcode-map.txt @@ -1051,7 +1051,7 @@ GrpTable: Grp6 EndTable GrpTable: Grp7 -0: SGDT Ms | VMCALL (001),(11B) | VMLAUNCH (010),(11B) | VMRESUME (011),(11B) | VMXOFF (100),(11B) | PCONFIG (101),(11B) | ENCLV (000),(11B) +0: SGDT Ms | VMCALL (001),(11B) | VMLAUNCH (010),(11B) | VMRESUME (011),(11B) | VMXOFF (100),(11B) | PCONFIG (101),(11B) | ENCLV (000),(11B) | WRMSRNS (110),(11B) 1: SIDT Ms | MONITOR (000),(11B) | MWAIT (001),(11B) | CLAC (010),(11B) | STAC (011),(11B) | ENCLS (111),(11B) 2: LGDT Ms | XGETBV (000),(11B) | XSETBV (001),(11B) | VMFUNC (100),(11B) | XEND (101)(11B) | XTEST (110)(11B) | ENCLU (111),(11B) 3: LIDT Ms |