linux-kernel - Re: [tip:x86/urgent] x86/kconfig: Add a Kconfig shortcut for building working KVM guest kernels

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Date:	Fri, 03 May 2013 17:10:15 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Randy Dunlap <rdunlap@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	David Rientjes <rientjes@...gle.com>, hpa@...or.com,
	linux-kernel@...r.kernel.org, penberg@...nel.org,
	levinsasha928@...il.com, mtosatti@...hat.com, tglx@...utronix.de,
	bp@...e.de, fengguang.wu@...el.com,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/urgent] x86/kconfig:  Add a Kconfig shortcut for building
 working KVM guest kernels

On 3.5.2013 17:08, Borislav Petkov wrote:
> On Fri, May 03, 2013 at 07:54:36AM -0700, Randy Dunlap wrote:
>> Could you alternately have a kvm_guest.config that should always work
>> for you?
> 
> I could, and I do. The idea, however, is to have this option upstream
> so that people don't have to go search for every relevant option for
> running the kernel a kvm guest.
> 
> Which reminds me: Pekka had a 'make kvmconfig' functionality in
> the kvmtool too. Which, TBH, is even better than having a Kconfig
> option with a bunch of selects. So, come to think of it, after all
> the controversy with such an option, having a 'make kvmconfig' do
> scripts/config -e <option> where <option> is in that list we select
> would be much better.
> 
> This won't break randconfigs at all, btw. :-)

You still risk that you miss some new dependency, but for a normal
configs as a base, this won't be an issue in most cases. Whether this is
implemented as a series of scripts/config calls or if there is a
kvm_guest.config does not matter much, as long as randconfig does not
see it ;).

Michal
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