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

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Message-ID: <1402391628.29980.15.camel@kazak.uk.xensource.com>
Date:	Tue, 10 Jun 2014 10:13:48 +0100
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Borislav Petkov <bp@...e.de>
CC:	"Luis R. Rodriguez" <mcgrof@...e.com>,
	"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 Tue, 2014-06-10 at 11:01 +0200, Borislav Petkov wrote:
> On Tue, Jun 10, 2014 at 09:35:39AM +0100, Ian Campbell wrote:
> > 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.
> 
> Hmm, no. I'm running my kvm-enabled configs on baremetal too and I
> wouldn't want any overhead at all. So kvmconfig and xenconfig should be
> separate targets with separate config files please.

NB the overhead I meant was a few kbs of .text and modules, not runtime
overhead.

Ian.

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