linux-kernel - Re: [PATCH 3/3] x86, platform, kconfig: add virtconfig defconfig helper

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Date:	Tue, 10 Jun 2014 09:35:39 +0100
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	"Luis R. Rodriguez" <mcgrof@...e.com>
CC:	Borislav Petkov <bp@...e.de>,
	"Luis R. Rodriguez" <mcgrof@...not-panic.com>,
	<tglx@...utronix.de>, <mingo@...hat.com>, <hpa@...or.com>,
	<x86@...nel.org>, <linux-kernel@...r.kernel.org>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Michal Marek <mmarek@...e.cz>,
	Randy Dunlap <rdunlap@...radead.org>,
	<levinsasha928@...il.com>, <mtosatti@...hat.com>,
	<fengguang.wu@...el.com>, David Vrabel <david.vrabel@...rix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	<xen-devel@...ts.xenproject.org>
Subject: Re: [PATCH 3/3] x86, platform, kconfig: add virtconfig defconfig
 helper

On Mon, 2014-06-09 at 19:15 +0200, Luis R. Rodriguez wrote:
> On Sat, Jun 07, 2014 at 11:04:30AM +0200, Borislav Petkov wrote:
> > On Fri, Jun 06, 2014 at 04:11:09PM -0700, Luis R. Rodriguez wrote:
> > > From: "Luis R. Rodriguez" <mcgrof@...e.com>
> > > 
> > > This lets you use:
> > > 
> > >    make virtconfig
> > > 
> > > to merge you current kernel configuration with options to
> > > enable both kvm and xen (dom0 and guest) requirements.
> > 
> > What would be the use case for that?
> 
> This was based on a recommendation on xen-devel after review of
> the xen RFC,

Actually what I meant was to *replace* kvmconfig with virtconfig and
then add the Xen stuff to it, i.e. to have a single thing to maintain
for all virt platforms, rather than end up with all 3 options.

I think the overhead of having some Xen stuff enabled in .config when
running on KVM and vice versa is small.

Ian.

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