linux-kernel - Re: [PATCH] paravirt.h

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Message-ID: <44EC1563.90206@vmware.com>
Date:	Wed, 23 Aug 2006 01:44:19 -0700
From:	Zachary Amsden <zach@...are.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Andi Kleen <ak@...e.de>, virtualization@...ts.osdl.org,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Andrew Morton <akpm@...l.org>,
	Chris Wright <chrisw@...s-sol.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] paravirt.h

Arjan van de Ven wrote:
>> Since this code is so rather, um, custom, I was going to reimplement 
>> stop_machine in the module.
>>     
>
> that sounds like a big mistake. I assume you want your VMI module to be
> part of mainline for one.
>
> And this is the sort of thing that if we want to support it, we better
> support it inside the main kernel, eg provide an api to modules to use
> it, rather than having each module hack their own....
>   

Yes, after discussion with Rusty, it appears that beefing up 
stop_machine_run is the right way to go.  And it has benefits for 
non-paravirt code as well, such as allowing plug-in kprobes or oprofile 
extension modules to be loaded without having to deal with a debug 
exception or NMI during module load/unload.

Thanks,

Zach
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