Re: [Xen-devel] AMD64

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

That could be made to work, but at least one of the kernels would need
to be in a more virtualised environment (e.g., shadow page tables,
shadow segment tables, ...). Either that or Xen itself would need to
schizophrenic and be able to switch between 32- and 64-bit modes to
match the running guest kernel. Ther problem is that Xen makes
underlying hardware structures visible to the guest, and these are
diffreent layouts in 32- and 64-bit mode.

It's something we're thinking about - we need things like shadow page
table anyway so we may be able to get 32-bit kernel on 64-bit Xen
working. 

 -- Keir

> What about using one 64 bit kernel and one 32 bit kernel?  I have an
> AMD64 laptop with an 802.11g wireless nic, and it would be handy to be
> able to run 64 bit apps while still  using ndiswrapper (32 bit kernel
> required) to drive the nic.
> 
> 
> On Mon, 8 Nov 2004 13:04:38 -0000, Ian Pratt <m+ian.pratt@xxxxxxxxxxxx> wrote:
> > 
> > > I've got an AMD64 and am currently dual-booting Gentoo 64-bit
> > > and SuSE 32-bit.
> > > Would it be possible to run them simultniously using xen?
> > 
> > Xen currently doesn't support AMD64/EM64T in 64 bit mode, but an x86_64
> > port is in the pipeline.
> > 
> > The first aim of the port will be to allow multiple x86_64 OS'es to run.
> > It should then be possible to use a 64bit capable arch-Xen OS that has
> > an all-32 bit userspace if so desired.
> > 
> > Ian
> > 
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> 
> 
> -- 
> Puer Misellus Triste
> 
> 
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 -=- MIME -=- 
What about using one 64 bit kernel and one 32 bit kernel?  I have an
AMD64 laptop with an 802.11g wireless nic, and it would be handy to be
able to run 64 bit apps while still  using ndiswrapper (32 bit kernel
required) to drive the nic.


On Mon, 8 Nov 2004 13:04:38 -0000, Ian Pratt <m+ian.pratt@xxxxxxxxxxxx> wro=
te:
>=20
> > I've got an AMD64 and am currently dual-booting Gentoo 64-bit
> > and SuSE 32-bit.
> > Would it be possible to run them simultniously using xen?
>=20
> Xen currently doesn't support AMD64/EM64T in 64 bit mode, but an x86_64
> port is in the pipeline.
>=20
> The first aim of the port will be to allow multiple x86_64 OS'es to run.
> It should then be possible to use a 64bit capable arch-Xen OS that has
> an all-32 bit userspace if so desired.
>=20
> Ian
>=20
> -------------------------------------------------------
> This SF.Net email is sponsored by:
> Sybase ASE Linux Express Edition - download now for FREE
> LinuxWorld Reader's Choice Award Winner for best database on Linux.
> http://ads.osdn.com/?ad_idU88&alloc_id=12065&opclick
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxxxx
> https://lists.sourceforge.net/lists/listinfo/xen-devel
>=20


--=20
Puer Misellus Triste


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