From: Sasha Levin <levinsasha928@gmail.com>
Date: Fri, 14 Oct 2011 07:36:09 +0000 (+0200)
Subject: kvm tools: Enable fast string operations
X-Git-Tag: next-20111025~3^2~10
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=5a00c132e7c1943f7ffcf365f1f44e59479ddc1f;p=karo-tx-linux.git

kvm tools: Enable fast string operations

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@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
---

diff --git a/tools/kvm/kvm-cpu.c b/tools/kvm/kvm-cpu.c
index fc0d6d44d9af..d7ae5ce163e2 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;