Re: [Libvir] [PATCH] pae/nonpae capabilities for paravirt xen guests
On Sun, Mar 25, 2007 at 03:48:41PM +0100, Richard W.M. Jones wrote:
David Lutterkort wrote:
>I noticed that the guest capabilities on a xen dom0 always contain both
>the pae and nonpae feature - AFAIK, you can't mix pae/nonpae guests and
>hosts, and only one of the features should be there.
>
>The attached patch contains the obvious fix.
Actually, <pae/><nonpae/> was intentional, to indicate that both modes
of operation could be used. (Perhaps the error, then, is that if PAE is
not supported, <features><nonpae/></features> should be used?).
Anyway,
I don't really understand the specifics of selecting PAE and non-PAE for
Xen guests, so I'll punt on this to Dan.
Yes, as Rich says its perfectly valid to have both flags listed under the
same architecture. We're actually dealing with a tri-state here rather than
a boolean. Xen can support
- PAE only (Xen i686 paravirt)
- non-PAE only (Xen i686 paravirt)
- PAE & non-PAE (Xen i686/x86_64 fullyvirt)
That said, I'm not sure we've got the translation of Xen capabilities
into XML quite right - I'm going to do some verification of a couple
of other dev boxes with varying levels of Xen support / archicture mixes.
Dan.
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