As far as I know, there is no special way to detect BIOS-disabled SVM. BIOS 
should always trap #GP on writing SVME bit. So the way you suggested should 
work.

Pär, are you sure that EFER.SVME bit has been set when the error happened? Our 
architecture design team confirmed that enabling EFER.SVME twice won't cause 
any problem (There will be some performance loss though). 

Regards,

-Wei


Avi Kivity wrote:
> Huang2, Wei wrote:
>> SVM looks available on your machine. If possible, could you provide
>> dmidecode information (type "dmidecode") for further verification? I
>> know that some vendors disabled SVM feature in BIOS last year. But
>> this was pretty rare. Maybe you can check whether BIOS has an option
>> for SVM.    
>> 
> 
> Is there a way to detect whether the bios has disabled svm?  If not,
> is trapping the #GP on wrmsr(EFER) a good way to do it? 



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