Re: [Xen-devel] Testing status of HVM (Intel VT) on 64bit XENunstable c/s 11616

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 27/9/06 13:30, "Li, Xin B" <xin.b.li@xxxxxxxxx> wrote:

>> 11626 has a possible fix for this and at least will print out
>> some more info
>> (even on production builds ;-) if the MSR_EFER write fails.
>> 
> 
> Can't understand your patch, can you explain more?
> And why it's a possible fix?

long_mode_do_msr_write() was not taking just the low 32 bits of EAX to form
the 64-bit MSR value. If the high 32 bits of RAX had garbage then this would
lead to garbage in the MSR value.

 -- Keir



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