From: "Jan Beulich" <jbeulich@novell.com>
To: xen-devel@lists.xensource.com, Keir Fraser <keir@xensource.com>
Subject: Re: feature flags use
Date: Fri, 10 Nov 2006 15:59:27 +0100 [thread overview]
Message-ID: <4554A1DF.76E4.0078.0@novell.com> (raw)
In-Reply-To: <C17A3E57.449F%keir@xensource.com>
>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.
>Anyway, what feature flag do you want to add? Is this to distinguish PV PAE
>guest from PV 64-bit guest?
At this point I was thinking about that hypervisor_virt_start change that the
kernel needs to advertise it can deal with.
Jan
next prev parent reply other threads:[~2006-11-10 14:59 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-10 14:16 feature flags use Jan Beulich
2006-11-10 14:52 ` Gerd Hoffmann
2006-11-10 15:01 ` Jan Beulich
2006-11-10 15:09 ` Gerd Hoffmann
[not found] ` <C17A3E57.449F%keir@xensource.com>
2006-11-10 14:59 ` Jan Beulich [this message]
2006-11-10 15:07 ` Ian Pratt
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