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[Xen-devel] Re: STGI #UD exception

from [Anthony Liguori]

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To:	mythbuster <embarbosa@xxxxxxxxx>
Subject:	[Xen-devel] Re: STGI #UD exception
From:	Anthony Liguori <aliguori@xxxxxxxxxx>
Date:	Thu, 21 Jun 2007 12:46:17 -0500
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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 inyour 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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