linux-kernel - Re: [Xen-devel] Re: [patch 14/21] Xen-paravirt: Add XEN config options and disable unsupported config options.

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Message-ID: <45D58D88.5020801@vmware.com>
Date:	Fri, 16 Feb 2007 02:55:04 -0800
From:	Zachary Amsden <zach@...are.com>
To:	Keir Fraser <keir@...source.com>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>,
	xen-devel@...ts.xensource.com, Andi Kleen <ak@....de>,
	Dan Hecht <dhecht@...are.com>, linux-kernel@...r.kernel.org,
	Chris Wright <chrisw@...s-sol.org>,
	Ian Pratt <ian.pratt@...source.com>,
	virtualization@...ts.osdl.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Hand <steven.hand@...cam.ac.uk>
Subject: Re: [Xen-devel] Re: [patch 14/21] Xen-paravirt: Add XEN config options
 and disable unsupported config options.

Keir Fraser wrote:
> On 16/2/07 10:19, "Zachary Amsden" <zach@...are.com> wrote:
>
>   
>> Doesn't stop_machine_run already take care of getting you out of all
>> kernel threads?  So you can only be sleeping, not preempted, in which
>> case, this might not be an issue?
>>     
>
> It ensures that no (non-stopmachine) threads are running on any of the other
> CPUs, but it doesn't guarantee that all threads are at any form of quiescent
> point. They can certainly have private references to machine addresses.
>
> Otherwise, what would be the point of the process freezer? :-)
>   

Yeah, I was over-hoping on that one.  At least thought it was worth 
suggesting as a starting point.  I had similar issues considering 
loading VMI as a module at runtime.

Zach
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