Recent (3.0+) Linux guests check for the fast string bit in
MSR_IA32_MISC_ENABLE before enabling rep/movs based memcpy and
related on fam 6/model 13+ processors.
Enable the bit by default, as required by the specification.
Signed-off-by: Avi Kivity <avi@xxxxxxxxxx>
---
arch/x86/kvm/x86.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 6b37f18..459f2bf 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6374,6 +6374,8 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
{
+ vcpu->arch.ia32_misc_enable_msr = MSR_IA32_MISC_ENABLE_FAST_STRING;
+
vcpu->arch.nmi_pending = false;
vcpu->arch.nmi_injected = false;
--
1.7.6.3
--
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