Xen users - Jun 2007 - What governs the type of hvm created? 32/32p/64?

I''m sure i''ve seen the answer to this but can''t
remember or find it.

What governs the type of hvm that gets created? I''m using a 64 bit dom0
and hypervisor on an amd system... is it simply that the operating
system that boots is either 32, 32pae, or 64 bits? Or is there some
configuration parameter that sets that?

Thanks

James

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> -----Original Message-----
> From: xen-users-bounces@lists.xensource.com 
> [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of 
> James Harper
> Sent: 13 June 2007 13:33
> To: xen-users@lists.xensource.com
> Subject: [Xen-users] What governs the type of hvm created? 32/32p/64?
> 
> I''m sure i''ve seen the answer to this but can''t
remember or find it.
> 
> What governs the type of hvm that gets created? I''m using a 
> 64 bit dom0
> and hypervisor on an amd system... is it simply that the operating
> system that boots is either 32, 32pae, or 64 bits? Or is there some
> configuration parameter that sets that?
The mode of the guest is decided by the guest itself [and it may well
change during the runtime of the guest, e.g. a guest may boot in 32-bit
mode and then transition to 64-bit mode [in fact, it starts in REAL
MODE, just like a normal PC]].

However, note that there are some settings in the config file that may
prevent the mode from being reached (e.g. if you disable PAE, then the
guest can not run in 32p or 64-bit [as 64-bit is an extension to PAE]). 

--
Mats
> 
> Thanks
> 
> James
> 
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> 


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