Re: [Xen-devel] PAE requirement in config file for HVM guests

[Keir Fraser <keir@xxxxxxxxxxxxx>]

On 22/11/06 08:36, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:

> Could anyone explain why it was necessary in 3.0.3 to require config files
> for 32-bit/PAE or 64-bit x86 hvm guests on respective hypervisors to have
> an explicit 'pae = 1', whereas in 3.0.2 this wasn't needed? It would seem
> that the emulated CPUID feature flag should, as in 3.0.2, just be
> suppressed if the hypervisor really can't support PAE (i.e. 32-bit non-PAE
> build).

It's only to allow pae to be masked off. I think that you can specify pae=1
always and it won't be advertised to the guest if the host doesn't support
it. If this isn't the case it should be, and I'd take a patch to make it so.
:-)

Oh, and xend should default pae=1 if it doesn't do so already.

 -- Keir



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