Xen devel - May 2009 - Can Xen catch the process switch in HVM guest?

Hi men,

Can Xen catch the process switch in HVM guest?

Does this depend on how the guest OS implements the process switch?

Can I catch the switch by the instrucion: `MOV to CR3`, or something else?

Thanks,
Wu


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Please take a look at sh_update_cr3.

-dulloor

2009/5/22 Wu Bingzheng <wubingzheng@163.com>
> Hi men,
>
> Can Xen catch the process switch in HVM guest?
>
> Does this depend on how the guest OS implements the process switch?
>
> Can I catch the switch by the instrucion: `MOV to CR3`, or something else?
>
> Thanks,
> Wu
>
> ------------------------------
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> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
>
>

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Why do you want to "catch the process switch in HVM guest"? What's
your exact need?
mov_to_cr3 of hvm guest can be intercepted by Xen if we don't consider the
case of HAP (e.g. EPT), but mov_to_cr3 doesn't mean necessarily process
switch and even an hvm guest may have no process at all (e.g., the DOS... :-)

BTW, if you could add a hypercall in your guest's process switch code,
things would be straightforward. :-)

Thanks,
-- Dexuan 

________________________________

From: xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Dulloor
Sent: 2009年5月22日 15:18
To: Wu Bingzheng
Cc: xen-devel
Subject: Re: [Xen-devel] Can Xen catch the process switch in HVM guest?


Please take a look at sh_update_cr3.

-dulloor


2009/5/22 Wu Bingzheng <wubingzheng@163.com>


	Hi men,
	
	Can Xen catch the process switch in HVM guest?
	
	Does this depend on how the guest OS implements the process switch?
	
	Can I catch the switch by the instrucion: `MOV to CR3`, or something else?
	
	Thanks,
	Wu
	



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