Recent kernels check for MSR_IA32_MISC_ENABLE_FAST_STRING in the MSR_IA32_MISC_ENABLE MSR before enabling reps/movs memcpy. So far we didn't set it, and got a slower memcpy and a warning: [ 0.000000] Disabled fast string operations This patch enables fast string operations. Signed-off-by: Sasha Levin <levinsasha928@xxxxxxxxx> --- tools/kvm/kvm-cpu.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/tools/kvm/kvm-cpu.c b/tools/kvm/kvm-cpu.c index fc0d6d4..d7ae5ce 100644 --- a/tools/kvm/kvm-cpu.c +++ b/tools/kvm/kvm-cpu.c @@ -142,6 +142,8 @@ static void kvm_cpu__setup_msrs(struct kvm_cpu *vcpu) vcpu->msrs->entries[ndx++] = KVM_MSR_ENTRY(MSR_LSTAR, 0x0); #endif vcpu->msrs->entries[ndx++] = KVM_MSR_ENTRY(MSR_IA32_TSC, 0x0); + vcpu->msrs->entries[ndx++] = KVM_MSR_ENTRY(MSR_IA32_MISC_ENABLE, + MSR_IA32_MISC_ENABLE_FAST_STRING); vcpu->msrs->nmsrs = ndx; -- 1.7.7 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
