Re: Migrating from x86 to amd64 Dom0 with x86 DomUs

[Steven Bellovin <smb%cs.columbia.edu@localhost>]

On Mar 13, 2010, at 10:11 AM, Marcin M. Jessa wrote:

> Den 13.03.2010 15:00, skrev Steven Bellovin:
>> On Mar 13, 2010, at 8:07 AM, Marcin M. Jessa wrote:
>> 
>>   
>>> Hi guys.
>>> 
>>> I've a Dom0 which runs on Intel x86 without virtualization on NetBSD 5.0 
>>> STABLE.
>>> The version of XEN I'm using is 3.1.4
>>> 
>>> I want to move my setup to a server with dual AMD Opterons which don't 
>>> support AMD-V™.
>>> 
>>> 
>>> My questions are:
>>> 
>>> - Can I upgrade my XEN 3.1.4?
>>> - Will I need a PAE kernel for my Dom0 ?
>>> - Can I run the 32 bit DomUs on a 64 bit Dom0? And if it's possible, what 
>>> kernels would I need then (PAE, non-PAE)?
>>> 
>>>     
>> I contemplated doing that, but decided to replace my disks as well, so I 
>> just built a new system elsewhere instead.  I can probably dig up the advice 
>> I received if you want.
>> 
>> I think, though, that if you switch to an amd64 kernel you'll need an amd64 
>> userland as well.
>>   
> Maybe I was not clear enough. The new system with Dom0 will be installed from 
> cratch with amd64 userland and kernel.
> I just want to keep my i386 DomUs which I have running on a 32-bit system now.

You may need to use a 386 PAE DomU kernel, but I think the rest of it should 
work.  (I was originally going to go that route, but I decided to switch my 
domUs to amd64 at the same time.  Probably, that was a mistake, but I survived 
it...)

                --Steve Bellovin, http://www.cs.columbia.edu/~smb