Run Xen on HVM guest?

Run Xen on HVM guest?

[Wu Bingzheng]

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Hi men,

I installed a HVM guest on Xen. And the results of 'cat /proc/cpuinfo'
are different on Dom0 and DomU(HVM).

The CPU mode is right on both:
  model name      : Intel(R) Core(TM)2 Quad  CPU Q9300  @ 2.50GHz
However, on Dom0 'flags' contains 'vmx', which is the key of HVM,
but on DomU, it doesn'e contains 'vmx'.

Does it mean that HVM DomU dose not support 'vmx', so we can't install
another Xen on HVM DomU?

I want to know the reason why the DomU didnot have 'vmx':
1. Intel VT doesn't support 'vmx' on DomU
2. Intel VT supports, but Xen doesn't support (now)
3. Other reason

Thanks,
Wu

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Re: Run Xen on HVM guest?

[Keir Fraser]

On 19/03/2009 08:15, "Wu Bingzheng" <wubingzheng@163.com> wrote:

> I want to know the reason why the DomU didnot have 'vmx':
> 1. Intel VT doesn't support 'vmx' on DomU
> 2. Intel VT supports, but Xen doesn't support (now)
> 3. Other reason

It¹s not easy to support VMX in a domU. So we don¹t support it.

 -- Keir

RE: Run Xen on HVM guest?

[Dan Magenheimer]

But, yes, it IS possible to run Xen in an HVM, but the
Xen in the HVM is only able to run PV guests.

(Note "possible" doesn't mean that it will work on
any given version of Xen.)

> -----Original Message-----
> From: Keir Fraser [mailto:keir.fraser@eu.citrix.com]
> Sent: Thursday, March 19, 2009 2:35 AM
> To: Wu Bingzheng; xen-devel@lists.xensource.com
> Subject: Re: [Xen-devel] Run Xen on HVM guest?
> 
> 
> On 19/03/2009 08:15, "Wu Bingzheng" <wubingzheng@163.com> wrote:
> 
> > I want to know the reason why the DomU didnot have 'vmx':
> > 1. Intel VT doesn't support 'vmx' on DomU
> > 2. Intel VT supports, but Xen doesn't support (now)
> > 3. Other reason
> 
> It¹s not easy to support VMX in a domU. So we don¹t support it.
> 
>  -- Keir
> 
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
>

RE: Run Xen on HVM guest?

[Zhang, Xiantao]

>Does it mean that HVM DomU dose not support 'vmx', so we can't install
>another Xen on HVM DomU 

In theory, you can run Xen with dom0 and PV guests in hvm guest, but can't install HVM guest in HVM guest because it depends on nested VT support in Xen.
Xiantao