Re: [kvm-commits] KVM: VMX: Use shadow TPR/cr8 for 64-bits guests

Re: [kvm-commits] KVM: VMX: Use shadow TPR/cr8 for 64-bits guests

[Gregory Haskins]

On Thu, 2007-08-23 at 10:46 +0300, Avi Kivity wrote:
> repository: /home/avi/kvm/linux-2.6
> branch: lapic5
> commit 8ed05c33d82a394c90b5dd830513416e59ffcf68
> Author: Yang, Sheng <sheng.yang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> Date:   Wed Aug 22 15:03:15 2007 +0300
> 
>     KVM: VMX: Use shadow TPR/cr8 for 64-bits guests
>     
>     This patch enables TPR shadow of VMX on CR8 access. 64bit Windows using
>     CR8 access TPR frequently. The TPR shadow can improve the performance of
>     access TPR by not causing vmexit.
>     

I remember when I added something similar to the lapic series that both
of my C2D systems (Merom + Woodcrest) reported that they didn't support
the feature in the HW.  Since those were fairly new, which ones *do*
support this (out of curiosity), or is there a microcode update floating
around out there ;).

-Greg


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Re: [kvm-commits] KVM: VMX: Use shadow TPR/cr8 for 64-bits guests

[Andi Kleen]

> I remember when I added something similar to the lapic series that both
> of my C2D systems (Merom + Woodcrest) reported that they didn't support
> the feature in the HW.  Since those were fairly new, which ones *do*
> support this (out of curiosity), or is there a microcode update floating
> around out there ;).

It's only supported in Penryn (upcomming 45nm Core2 shrink) AFAIK
Intel made a press release about this recently.

-Andi

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Re: [kvm-commits] KVM: VMX: Use shadow TPR/cr8 for64-bits guests

[Dong, Eddie]

kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org wrote:
>> I remember when I added something similar to the lapic series that
>> both of my C2D systems (Merom + Woodcrest) reported that they didn't
>> support the feature in the HW.  Since those were fairly new, which
>> ones *do* support this (out of curiosity), or is there a microcode
>> update floating around out there ;).

Using latest microcode is always better :-)
You may see something amazing.

thx,eddie

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