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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_cpuid_x86.c | |
| 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_cpuid_x86.c')
| -rw-r--r-- | tools/libxc/xc_cpuid_x86.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/tools/libxc/xc_cpuid_x86.c b/tools/libxc/xc_cpuid_x86.c index 287b1e7789..d791691e69 100644 --- a/tools/libxc/xc_cpuid_x86.c +++ b/tools/libxc/xc_cpuid_x86.c @@ -355,7 +355,8 @@ static void xc_cpuid_hvm_policy( case 0x00000007: /* Intel-defined CPU features */ if ( input[1] == 0 ) { - regs[1] &= bitmaskof(X86_FEATURE_SMEP); + regs[1] &= (bitmaskof(X86_FEATURE_SMEP) | + bitmaskof(X86_FEATURE_ERMS)); } else regs[1] = 0; regs[0] = regs[2] = regs[3] = 0; @@ -478,7 +479,8 @@ static void xc_cpuid_pv_policy( case 7: if ( input[1] == 0 ) - regs[1] &= bitmaskof(X86_FEATURE_FSGSBASE); + regs[1] &= (bitmaskof(X86_FEATURE_FSGSBASE) | + bitmaskof(X86_FEATURE_ERMS)); else regs[1] = 0; regs[0] = regs[2] = regs[3] = 0; |