commit f705405977c8166158b05706194501f2de30d09c
author Sasha Levin <levinsasha928@gmail.com> Fri Oct 14 09:36:09 2011 +0200
committer Will Deacon <will.deacon@arm.com> Mon Jun 01 16:39:48 2015 +0100
tree d42988bd3b875c3f1959e367c3da89afd2b46e37
parent 076e946ec2bc56a346e87b255693e37c582b0299

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>

kvm-cpu.c

diff --git a/kvm-cpu.c b/kvm-cpu.c
index fc0d6d4..d7ae5ce 100644
--- a/kvm-cpu.c
+++ b/kvm-cpu.c
@@ -142,6 +142,8 @@
 	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;