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Re: [Xen-devel] VMM detection
| To: | Wu Bingzheng <wubingzheng@xxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] VMM detection |
| From: | Jun Koi <junkoi2004@xxxxxxxxx> |
| Date: | Fri, 6 Mar 2009 11:04:22 +0900 |
| Cc: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Thu, 05 Mar 2009 18:04:47 -0800 |
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On Thu, Mar 5, 2009 at 5:37 PM, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> wrote: > On 05/03/2009 03:15, "Wu Bingzheng" <wubingzheng@xxxxxxx> wrote: > >> So do you mean that in HVM guest, the SGDT will get the GDT of guest, but not >> Xen? >> >> It lists 17 instructions in Pentium instruction set, which is virtualization >> sensitive >> and unprivileged, including SGDT, at paper named >> Analysis of the IntelPentium's Ability to Support aSecure Virtual Machine >> Monitor >> <http://www.usenix.org/events/sec00/full_papers/robin/robin_html/index.html>. >> Using these instructions, we can detect VMM on a PV guest. >> >> I want to know if we can use these instructions to detect VMM on a HVM guest. > > 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. Thanks, J _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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