linux-kernel - Re: [PATCH 25/25] [PATCH] add paravirtualization support for x86

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Message-ID: <Pine.LNX.4.58.0708091032300.32067@gandalf.stny.rr.com>
Date:	Thu, 9 Aug 2007 10:37:21 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Andi Kleen <ak@...e.de>
cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Glauber de Oliveira Costa <gcosta@...hat.com>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	rusty@...tcorp.com.au, mingo@...e.hu, chrisw@...s-sol.org,
	avi@...ranet.com, anthony@...emonkey.ws,
	virtualization@...ts.linux-foundation.org, lguest@...abs.org
Subject: Re: [PATCH 25/25] [PATCH] add paravirtualization support for x86_64

--
On Thu, 9 Aug 2007, Andi Kleen wrote:
>
> > This has to match the normal C calling convention though, doesn't it?
>
> Native cli/sti/save/restore_flags are all only assembly and can be easily
> (in fact more easily than in C) written as pure assembler functions. Then
> you can use whatever calling convention you want.

I agree.
Should we make a paravirt_ops_asm.S file that can implement these native
funcions, and so we can get rid of the C functions only doing asm?

>
> While some paravirt implementations may have more complicated implementations
> i guess it's still a reasonable requirement to make them simple enough
> in pure assembler. If not they can use a trampoline, but that's hopefully
> not needed.

It works for lguest64.  I'm sure it should be no problem with other HVs.

-- Steve

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