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| author | Yang, Wei <wei.y.yang@intel.com> | 2011-06-14 13:13:18 +0100 |
|---|---|---|
| committer | Yang, Wei <wei.y.yang@intel.com> | 2011-06-14 13:13:18 +0100 |
| commit | d3b35446fde62e77d97dc0c8edd9785b352f762c (patch) | |
| tree | 523c60aedf4084c57db0ca2b3d5c377e66ed592e /tools/libxc/xc_cpufeature.h | |
| parent | 4e9144664327f34764c5625734cc21d40201ebfb (diff) | |
| download | xen-d3b35446fde62e77d97dc0c8edd9785b352f762c.tar.gz xen-d3b35446fde62e77d97dc0c8edd9785b352f762c.tar.bz2 xen-d3b35446fde62e77d97dc0c8edd9785b352f762c.zip | |
x86: Pass through ERMS CPUID feature for HVM and PV guests
This patch exposes ERMS feature to HVM and PV guests.
The REP MOVSB/STOSB instruction can enhance fast strings attempts to
move as much of the data with larger size load/stores as possible.
Signed-off-by: Yang, Wei <wei.y.yang@intel.com>
Diffstat (limited to 'tools/libxc/xc_cpufeature.h')
| -rw-r--r-- | tools/libxc/xc_cpufeature.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/libxc/xc_cpufeature.h b/tools/libxc/xc_cpufeature.h index b1941f9956..96a44ff59f 100644 --- a/tools/libxc/xc_cpufeature.h +++ b/tools/libxc/xc_cpufeature.h @@ -126,5 +126,6 @@ /* Intel-defined CPU features, CPUID level 0x00000007:0 (ebx) */ #define X86_FEATURE_FSGSBASE 0 /* {RD,WR}{FS,GS}BASE instructions */ #define X86_FEATURE_SMEP 7 /* Supervisor Mode Execution Protection */ +#define X86_FEATURE_ERMS 9 /* Enhanced REP MOVSB/STOSB */ #endif /* __LIBXC_CPUFEATURE_H */ |