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Re: [Xen-devel] VMM detection

To: Jun Koi <junkoi2004@xxxxxxxxx>, Wu Bingzheng <wubingzheng@xxxxxxx>
Subject: Re: [Xen-devel] VMM detection
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Fri, 06 Mar 2009 08:21:00 +0000
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On 06/03/2009 02:04, "Jun Koi" <junkoi2004@xxxxxxxxx> wrote:

>> No, they behave 'natively' when running as an HVM guest. The guest cannot
>> easily tell it is running on a VMM.
> It is not difficult if you look else where. For ex, HVM uses Bochs
> BIOS, and that is a clear evidence.
> There are already a lot of papers proved that it is impossible to hide
> the fact that your machine is virtual. You can search on Usenix
> website, for example.

I believe it will always be trivial as a kernel. As an application less so.
Certainly the specific '17 unvirtualisable instructions' the OP asked about
are handled undetectably by HVM.

 -- Keir

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