Re: Windows XP internal Power error

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Michael Riepe wrote:
> Hi!
>
> I found this footnote in my Intel docs (22.4):
>
>   
>> Processing of an entry fails in any of the following cases:
>>     
> [...]
>   
>> • An attempt to write bits 127:64 to the MSR indexed by bits 31:0 of the entry
>> would cause a general-protection exception if executed via WRMSR with CPL =
>> 0.
>>     
>
> And there's a footnote that says:
>
>   
>> Note the following about processors that support Intel 64 architecture. If CR0.PG = 1, WRMSR to
>> the IA32_EFER MSR causes a general-protection exception if it would modify the LME bit. Since
>> CR0.PG is always 1 in VMX operation, the IA32_EFER MSR should not be included in the
>> VM-entry MSR-load area for the purpose of modifying the LME bit.
>>     
>
>   

Well spotted!  I must have read this half a dozen times and never 
spotted the footnote. (the footnote is on _a different page_ to the 
footnote marker, which doesn't help)


> Might that be the reason?
>   

Very likely.  Though I wonder why no one has hit this before.


-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.


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