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kvm tools: Enable fast string operations

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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>
This commit is contained in:
Sasha Levin
2015-06-01 16:39:48 +01:00
committed by Will Deacon
parent 076e946ec2
commit f705405977
1 changed files with 2 additions and 0 deletions
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kvm-cpu.c
+2
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@@ -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;