[Xen-devel] Re: STGI #UD exception

[Anthony Liguori <aliguori@xxxxxxxxxx>]

mythbuster wrote:
> Hello all,
>
> AMD manual states about STGI instruction:
>
> "This instruction generates a #UD exception is SVM is not enabled."
>
> However, if I execute in ring-0 the STGI instruction in my system with
> EFER.SVME == 0, I receive a #GP exception instead of a #UD exception.
> In other test, I just set the SVME bit to 1 and now I receive a #UD
> exception! 
So SVM doesn't work at all?  Have you checked to see if it's disabled in 
your BIOS?
Regards,

Anthony Liguori

> Is the manual wrong?
>
> P.S.: My CPU obviously has the SVM extensions (AMD X2 4600+ AM2)

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