KVM: Enable ERMS feature support for KVM
Yang, Wei [Tue, 14 Jun 2011 07:19:06 +0000 (15:19 +0800)]
This patch exposes ERMS feature to KVM 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>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/kvm/x86.c

index 76c16a5..0b803f0 100644 (file)
@@ -2372,7 +2372,7 @@ static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
 
        /* cpuid 7.0.ebx */
        const u32 kvm_supported_word9_x86_features =
-               F(SMEP) | F(FSGSBASE);
+               F(SMEP) | F(FSGSBASE) | F(ERMS);
 
        /* all calls to cpuid_count() should be made on the same cpu */
        get_cpu();