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RE: [Xen-devel] VT-x and frontend/backend drivers

To: "Mark Ryden" <markryde@xxxxxxxxx>, "Xen Mailing List" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] VT-x and frontend/backend drivers
From: "Ling, Xiaofeng" <xiaofeng.ling@xxxxxxxxx>
Date: Tue, 10 Jan 2006 22:14:40 +0800
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We already have patches for para-dirver support sent to this list before, you 
search it if you need.

Mark Ryden <> wrote:
> Hello,
>   As I saw in this mailing list, there should be some
>       emulation solution for drivers when using VT-x processors.
> See for example :
> http://lists.xensource.com/archives/html/xen-devel/2005-12/msg00763.html
> My question is this;
>   As I understand, the VMX support in the new  VT-x processors
>  enables us to prevent Guest OSs from performing unwanted
>   instructions (HLT , for example). This is done by using the root
> and non-root VMX operation. Thus , we don't use paravirtualization
> and we can run unmodified guest. Is there a possibility or any
> intention of using the backend-frontend solution of Xen (maybe with
> some fixes) when using VT-x processors ? wouldn't it be much better
> in terms of performance than using hardware emulation (based on QEMU
> maybe)?      
> Regards,
>       --MR
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