linux-kernel - Re: [Qemu-devel] [PATCH] KVM: Add wrapper script around QEMU to test kernels

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Message-ID: <alpine.LFD.2.02.1111072204370.3082@tux.localdomain>
Date:	Mon, 7 Nov 2011 22:09:34 +0200 (EET)
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	"Frank Ch. Eigler" <fche@...hat.com>
cc:	Ingo Molnar <mingo@...e.hu>, Vince Weaver <vince@...ter.net>,
	Ted Ts'o <tytso@....edu>, Pekka Enberg <penberg@...nel.org>,
	Anthony Liguori <anthony@...emonkey.ws>,
	Avi Kivity <avi@...hat.com>,
	"kvm@...r.kernel.org list" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
	qemu-devel Developers <qemu-devel@...gnu.org>,
	Alexander Graf <agraf@...e.de>,
	Blue Swirl <blauwirbel@...il.com>,
	Américo Wang <xiyou.wangcong@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [Qemu-devel] [PATCH] KVM: Add wrapper script around QEMU to test
 kernels

On Mon, 7 Nov 2011, Frank Ch. Eigler wrote:
>> The ABI design allows for that kind of flexible extensibility, and
>> it's one of its major advantages.
>>
>> What we *cannot* protect against is you relying on obscure details of
>> the ABI [...]
>
> Is there some documentation that clearly spells out which parts of the
> perf syscall userspace ABI are "obscure" and thus presumably
> changeable?

That's actually something the KVM and virtio folks have done a great job 
with IMHO. Both ABIs are documented pretty extensively and the specs are 
kept up to date.

I guess for perf ABI, "perf test" is the closest thing to a specification 
so if your application is using something that's not covered by it, you 
might be in trouble.

 			Pekka
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