Re: [Xen-users] PV 32-in-64 ? Howto ?

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

> D'oh!  My mistake!!  You can run 32 bit HVM guests no problem on a 64
> bit dom0, but you can't run 32 bit PV guests on a 64 bit dom0.

Since 3.1 you can run 32-bit PV guests on a 64-bit Xen.  You can even run a 
32-bit dom0 on a 64-bit Xen and still have 64-bit domUs running.  The 32-bit 
guests have to use PAE, though.

32-bit PV guests on Xen are, from what I've heard, better peforming than the 
64-bit PV guests...

> I really want to make a grid to add to the faq:

So now we have:

                               Xen
                   -----------------------------------------
                   32bit   32-bit/PAE   64bit
 
 Dom0 32-bit       yes     no           no
 Dom0 32-bit PAE   no      yes          yes
 Dom0 64-bit       no      no           yes


 dU 32bit PV       yes     no           no
 dU 32-bit PAE PV  no      yes          yes
 dU 64bit PV       no      no           yes

 dU 32bit HVM      yes     yes          yes
 dU 32-bit PAE HVM no      yes          yes
 dU 64bit HVM      no      no           yes


> Does anyone have anything to add/fix about that grid?  Especially
> if/when you can run a 64bit domU on a 32bit dom0?

How's that? ;-)

Cheers,
Mark

> -Dylan
>
> > > But I must Install  a 32bits PAE kernel in dom0 and setup properly in
> > > the config file isn't it ?
> > > When I try to instal 32bits kernel package dom0 tell me that the
> > > architecture is incorrect.
> > >
> > > If I run the 32 bits domU with the dom0 kernel  and uname -a return
> > > x86_64 inside the domU.
> > > In reality I just need to install a 32 bits domU to compile a 32bits
> > > kernel for another application.
> > >
> > > make menuconfig  detect that I'm on 64bits architecture so I can't
> > > choose 32bits processor.
> > >
> > > Mark Williamson escribió:
> > >>> I believe you just install the 32 bit OS.  It's like running 32 bit
> > >>> linux on a 64bit box.  You don't need to tell the box it's running a
> > >>> 32 bit OS.
> > >>>
> > >>> Of course, I could be wrong...
> > >>
> > >> If you install a 32-bit filesystem and boot it using a 32-bit PAE
> > >> XenLinux kernel, Xen will recognise that it's a 32-bit guest and set
> > >> things up appropriately.
> > >>
> > >> Cheers,
> > >> Mark
> > >>
> > >>> -Dylan
> > >>>
> > >>>> Hello,
> > >>>>
> > >>>> Does anyone know which is the setup to run paravirtualized domu
> > >>>> 32bits inside a dom0 64bits...
> > >>>> I've got Xen 3.1
> > >>>>
> > >>>> Do I must add something to the config file ?
> > >>>> Do I should install 32bits kernel ?
> > >>>>
> > >>>> Regards
> > >>>>
> > >>>>
> > >>>> _______________________________________________
> > >>>> Xen-users mailing list
> > >>>> Xen-users@xxxxxxxxxxxxxxxxxxx
> > >>>> http://lists.xensource.com/xen-users
> > >>>
> > >>> _______________________________________________
> > >>> Xen-users mailing list
> > >>> Xen-users@xxxxxxxxxxxxxxxxxxx
> > >>> http://lists.xensource.com/xen-users
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users



-- 
Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users