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

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Date:	Thu, 09 Aug 2007 08:09:16 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Andi Kleen <ak@...e.de>,
	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

Steven Rostedt wrote:
> --
> 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.
>   

Hm, I can't say the idea thrills me.  Lets get the thing working first,
and then worry about having special per-pvop calling conventions.

    J
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