* [PATCH] KVM: Enable "fast string operations" in MSR_IA32_MISC_ENABLE
@ 2011-09-22 12:03 Avi Kivity
2011-09-23 14:56 ` Marcelo Tosatti
0 siblings, 1 reply; 3+ messages in thread
From: Avi Kivity @ 2011-09-22 12:03 UTC (permalink / raw)
To: Marcelo Tosatti, kvm
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@redhat.com>
---
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
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH] KVM: Enable "fast string operations" in MSR_IA32_MISC_ENABLE
2011-09-22 12:03 [PATCH] KVM: Enable "fast string operations" in MSR_IA32_MISC_ENABLE Avi Kivity
@ 2011-09-23 14:56 ` Marcelo Tosatti
2011-10-04 14:15 ` Avi Kivity
0 siblings, 1 reply; 3+ messages in thread
From: Marcelo Tosatti @ 2011-09-23 14:56 UTC (permalink / raw)
To: Avi Kivity; +Cc: kvm
On Thu, Sep 22, 2011 at 03:03:02PM +0300, Avi Kivity wrote:
> 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@redhat.com>
Belongs to userspace.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] KVM: Enable "fast string operations" in MSR_IA32_MISC_ENABLE
2011-09-23 14:56 ` Marcelo Tosatti
@ 2011-10-04 14:15 ` Avi Kivity
0 siblings, 0 replies; 3+ messages in thread
From: Avi Kivity @ 2011-10-04 14:15 UTC (permalink / raw)
To: Marcelo Tosatti; +Cc: kvm
On 09/23/2011 05:56 PM, Marcelo Tosatti wrote:
> On Thu, Sep 22, 2011 at 03:03:02PM +0300, Avi Kivity wrote:
> > 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@redhat.com>
>
> Belongs to userspace.
>
Right - patch coming up.
--
error compiling committee.c: too many arguments to function
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2011-10-04 14:15 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2011-09-22 12:03 [PATCH] KVM: Enable "fast string operations" in MSR_IA32_MISC_ENABLE Avi Kivity
2011-09-23 14:56 ` Marcelo Tosatti
2011-10-04 14:15 ` Avi Kivity
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