Re: [kvm-devel] [PATCH]: Fix MSR_K7_EVNTSEL{0,3} for SVM

[Chris L. <cla...@re...>]

Avi Kivity wrote:
> 
>>     1811:	8d 86 00 00 ff 3f    	lea    0x3fff0000(%rsi),%eax
>>     1817:	83 f8 03             	cmp    $0x3,%eax
>>     181a:	0f 87 e2 01 00 00    	ja     1a02 <svm_set_msr+0x27f>
> Now it uses %rsi instead of %esi, and any junk in the upper bits will 
> cause the ja to be taken.
> 
> We need to get a reduced testcase to the gcc folks, this is a serious 
> bug.  Any changes in the code to work around this would be fragile.
> 

Ouch, I missed this on my reading of it.  I'll try to come up with a standalone
program that shows this.

Thanks, Avi.

Chris Lalancette