RE: [Xen-devel] VMX: emulated guest use SYSENTER MSRs

["Li, Xin B" <xin.b.li@xxxxxxxxx>]

I will send out the patch soon.

-Xin 

>-----Original Message-----
>From: Keir Fraser [mailto:Keir.Fraser@xxxxxxxxxxxx] 
>Sent: Saturday, July 07, 2007 4:52 PM
>To: Li, Xin B; Jan Beulich; xen-devel@xxxxxxxxxxxxxxxxxxx
>Subject: Re: [Xen-devel] VMX: emulated guest use SYSENTER MSRs
>
>Since they are included in the VMCS, and read from there on 
>save/restore,
>the vmexit appears to be unnecessary.
>
> -- Keir
>
>On 7/7/07 08:48, "Li, Xin B" <xin.b.li@xxxxxxxxx> wrote:
>
>> 
>>> What is the reason for not simply clearing the MSR bitmap bits
>>> for these three MSRs, and rather handling the reads/writes 
>in software?
>> 
>> I haven't checked those MSRs, the original concern is we need
>> save/restore them when context switch, is this needed?
>> 
>> -Xin 
>> 
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>

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