Re: [Xen-users] Dumb 32 on 64 question

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

> I'm unclear about what 32 on 64 means and how one uses it.
>
> I have a 64 bit box running a 64 bit Xen 3.1.0 and a 64 bit dom0.
>
> I want to install a 32 bin HVM domU.  Do I need to do anything
> special?

Not that I know of...  32-on-64 is specifically a feature for PV guests; HVM 
has been able to run 32-bit OSes on a 64-bit platform for ages.

> The new 32-on-64 features in 3.1.0 are only for PV guests and not for
> HVM, right?

I *think* that 32-on-64 might enable you to use paravirtualised devices in 
your 32-bit HVM guests where previously you couldn't.  I'm not 100% on this 
though.

> Will it just act like I was running a 32 bit OS on 64 bit hardware or
> will it pretend to be 32 bit hardware?

Yep, I reckon that'll work.

> Will it use more memory like an OS in 64 bits?

It'll be running in 32-bit mode, so this shouldn't be the case.

Cheers,
Mark

-- 
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!

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