linux-kernel - Re: [Xen-devel] [PATCH V3 1/6]: PVH: basic and header changes, elfnote changes, ...

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Message-ID: <1350982301.2237.6.camel@zakaz.uk.xensource.com>
Date:	Tue, 23 Oct 2012 09:51:41 +0100
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	"Xen-devel@...ts.xensource.com" <Xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH V3 1/6]: PVH: basic and header changes,
 elfnote changes, ...

On Fri, 2012-10-19 at 14:17 +0100, Konrad Rzeszutek Wilk wrote:
> > > +config XEN_X86_PVH
> > > +	bool "Support for running as a PVH guest (EXPERIMENTAL)"
> > > +	depends on X86_64 && XEN && EXPERIMENTAL
> > > +	default n
> > > +	help
> > > +	   This option enables support for running as a PVH guest (PV guest
> > > +	   using hardware extensions) under a suitably capable hypervisor.
> > > +	   This option is EXPERIMENTAL because the hypervisor interfaces
> > > +	   which it uses are not yet considered stable therefore backwards and
> > > +	   forwards compatibility is not yet guaranteed.  If unsure, say N.
> > 
> > Do we really need the kconfig symbol? Why can't we have it always
> 
> Yes for right now. That is to make sure that we can test for regressions
> PV guests on a hypervisor without PVH extensions - or vice-versa:
> PVH hypervisors with an normal PV guest.

Also the "depends on X86_64" bit is currently quite important...

Ian.

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