RE: [Xen-users] xen over quemu OR quemu in Xen domU on a system with HVM-capable CPU

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Igor Chubin
> Sent: 30 May 2007 17:13
> To: Igor Chubin
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] xen over quemu OR quemu in Xen domU 
> on a system with HVM-capable CPU
> 
> On Mi, Mai 30, 2007 at 07:09:55 +0300, Igor Chubin wrote:
> > 
> > 
> > Hello all, 
> > 
> > 
> > I know that the question:
> > 
> > Is it possible to run quemu inside Xen domU
> > or run Xen domain 0 on quemu have discussed 
> > earlier in this mail list.
> > 
> > As far as I remember this is possible
> > except such a configuration where kquemu acceleration is in use.
> > 
> > 
> > 
> > But what about HVM-capable systems?
> > 
> > 
> > Please tell me are there the same restrictions for the 
> hvm-capable systems?
> > 
> 
> 
> 
> 
> Actually, I want to run 
> 
> quemu + kquemu inside Xen Domain 0 on the HVM-capable system.

No, because kqemu is still requiring access to ring 0 protection level
(that's the highest privilege level), which is still not available to
anything other than the hypvervisor itself - you can get a "different"
ring 0 for guest domains, but that's not in Dom0. 

So the answer to this question is the same as for non-HVM capable
systems. 

I still don't quite understand what the purpose of running kqemu on top
of a HVM-capable system is, as it's almost certain to be no faster than
running a HVM domain itself. It may not be FASTER to run the HVM domain
either - depending on what's going on in the domain, but most cases it
probably is. 

--
Mats
> 
> Is it possible?
> 
> 
> > Thank you!
> > 
> > 
> > -- 
> > WBR, i.m.chubin
> > 
> > 
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
> 
> -- 
> WBR, i.m.chubin
> 
> 
> _______________________________________________
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> http://lists.xensource.com/xen-users
> 
> 
> 



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