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RE: [Xen-devel] feature flags use

from [Ian Pratt]

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To:	"Jan Beulich" <jbeulich@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Keir Fraser" <keir@xxxxxxxxxxxxx>
Subject:	RE: [Xen-devel] feature flags use
From:	"Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date:	Fri, 10 Nov 2006 15:07:18 -0000
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Thread-topic:	[Xen-devel] feature flags use

> >That flag is treated oddly. Actually we detect if the kernel uses Elf
> notes
> >or whether it has the string PAE=yes[extended]. In either case we
notify
> the
> >hypervisor via *vm_assist*! This then decides whether or not we
advertise
> >the XENFEAT flag to the domU.
> 
> I was talking about XENFEAT_pae_pgdir_above_4gb - this flag appears to
be
> be useless.
> Also, regardless of whether you advertise support for the feature to a
> domU,
> the code inside Xen doesn't treat the two cases (kernel with and
without
> this
> flag set) differently.

The xc_linux_restore code in the tools library needs to be able to read
the feature flag from Xen.

Ian

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