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| author | Fenghua Yu <fenghua.yu@intel.com> | 2020-09-15 09:30:08 -0700 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2020-09-17 20:03:54 +0200 |
| commit | ff4f82816dff28ffaaff96d1409bb3811d345514 (patch) | |
| tree | 8c6817d993966cc57c5c545c625c75c179dd8cbf /arch/x86/include/asm | |
| parent | 4e7b11567d946ebe14a3d10b697b078971a9da89 (diff) | |
| download | lwn-ff4f82816dff28ffaaff96d1409bb3811d345514.tar.gz lwn-ff4f82816dff28ffaaff96d1409bb3811d345514.zip | |
x86/cpufeatures: Enumerate ENQCMD and ENQCMDS instructions
Work submission instruction comes in two flavors. ENQCMD can be called
both in ring 3 and ring 0 and always uses the contents of a PASID MSR
when shipping the command to the device. ENQCMDS allows a kernel driver
to submit commands on behalf of a user process. The driver supplies the
PASID value in ENQCMDS. There isn't any usage of ENQCMD in the kernel as
of now.
The CPU feature flag is shown as "enqcmd" in /proc/cpuinfo.
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Link: https://lkml.kernel.org/r/1600187413-163670-5-git-send-email-fenghua.yu@intel.com
Diffstat (limited to 'arch/x86/include/asm')
| -rw-r--r-- | arch/x86/include/asm/cpufeatures.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h index 2901d5df4366..fea10d04d05f 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -353,6 +353,7 @@ #define X86_FEATURE_CLDEMOTE (16*32+25) /* CLDEMOTE instruction */ #define X86_FEATURE_MOVDIRI (16*32+27) /* MOVDIRI instruction */ #define X86_FEATURE_MOVDIR64B (16*32+28) /* MOVDIR64B instruction */ +#define X86_FEATURE_ENQCMD (16*32+29) /* ENQCMD and ENQCMDS instructions */ /* AMD-defined CPU features, CPUID level 0x80000007 (EBX), word 17 */ #define X86_FEATURE_OVERFLOW_RECOV (17*32+ 0) /* MCA overflow recovery support */ |