64bit Hypervisor on 32bit OS

[thewird]

I've been reading about how to make Xen show more then
16GB of ram and still support 32bit but so far all my
attempts have not worked. FC7 was supposed to be able
to run 32bit guests on its 64bit OS but because of a
feature freeze, this was not possible even though it
still says you can do it in the release notes which I
find ridiculous.

Anyway, someone told me if I replace the hypervisor
with the 64bit counterpart, then I should be able to
see more the 16GB of memory and be able to run 32bit
guests. I did this by extracting the files from the
64bit RPM and replaced the xen.gz-2.6.20-2925.11.fc7
file with the one from the 64bit RPM and rebooted. The
OS booted fine, however, when I tried
running/installing a 32bit domU the console would not
load or would lock up almost immediately.

I can't think of anything else to try and any help
would be greatly appreciated.

thewird

[Richard W.M. Jones]

thewird wrote:
>  I've been reading about how to make Xen show more then
>  16GB of ram and still support 32bit but so far all my
>  attempts have not worked. FC7 was supposed to be able
>  to run 32bit guests on its 64bit OS but because of a
>  feature freeze, this was not possible even though it
>  still says you can do it in the release notes which I
>  find ridiculous. 
Are you sure?  FC7 runs 32 bit fullvirt guests fine for me (on 64 bit 
hardware/hypervisor).  I didn't yet try to run a 32 bit paravirt guest 
though.

Rich.

-- 
Emerging Technologies, Red Hat - http://et.redhat.com/~rjones/
Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod
Street, Windsor, Berkshire, SL4 1TE, United Kingdom.  Registered in
England and Wales under Company Registration No. 03798903

[thewird]

What files did you replace to convert the hypervisor
to 64bit?

thewird

--- "Richard W.M. Jones" <rjones(a)redhat.com&gt; wrote:

>  thewird wrote:
>  > I've been reading about how to make Xen show more
>  then
>  > 16GB of ram and still support 32bit but so far all
>  my
>  > attempts have not worked. FC7 was supposed to be
>  able
>  > to run 32bit guests on its 64bit OS but because of
>  a
>  > feature freeze, this was not possible even though
>  it
>  > still says you can do it in the release notes
>  which I
>  > find ridiculous.
>  
>  Are you sure?  FC7 runs 32 bit fullvirt guests fine
>  for me (on 64 bit 
>  hardware/hypervisor).  I didn't yet try to run a 32
>  bit paravirt guest 
>  though.
>  
>  Rich.
>  
>  -- 
>  Emerging Technologies, Red Hat -
>  http://et.redhat.com/~rjones/
>  Registered Address: Red Hat UK Ltd, Amberley Place,
>  107-111 Peascod
>  Street, Windsor, Berkshire, SL4 1TE, United Kingdom.
>   Registered in
>  England and Wales under Company Registration No.
>  03798903
>

[Richard W.M. Jones]

thewird wrote:
>  What files did you replace to convert the hypervisor
>  to 64bit? 
I'm just using a 64 bit F7 as the dom0.  We must be talked at crossed 
purposes now.

Rich.

-- 
Emerging Technologies, Red Hat - http://et.redhat.com/~rjones/
Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod
Street, Windsor, Berkshire, SL4 1TE, United Kingdom.  Registered in
England and Wales under Company Registration No. 03798903