linux-kernel - Re: [patch] KVM: T60 resume fix

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Date:	Mon, 5 Mar 2007 09:44:49 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Avi Kivity <avi@...ranet.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Pavel Machek <pavel@....cz>, Adrian Bunk <bunk@...sta.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Michael S. Tsirkin" <mst@...lanox.co.il>,
	Thomas Gleixner <tglx@...utronix.de>, linux-pm@...ts.osdl.org,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	Daniel Walker <dwalker@...sta.com>, Len Brown <lenb@...nel.org>
Subject: Re: [patch] KVM: T60 resume fix


* Avi Kivity <avi@...ranet.com> wrote:

> >> That is already CPU_ONLINE in my tree (and in the pull request sent 
> >> to Linus a couple of days ago).
> >
> > that solves the resume problem - but doesnt solve the CPU_DEAD issue 
> > of sending an IPI to an already offline CPU. Might be a better idea 
> > to do it in CPU_DOWN_PREPARE? (and then to also add a 
> > CPU_DOWN_FAILED branch?)
> 
> Mainline now has DOWN_PREPARE and UP_CANCELED calling 
> ->hardware_disable(), and ONLINE calling ->hardware_enabled().  What 
> tree are you looking at?

oh, i just hand-fixed it. I'll check current-git now.

> [but I do see the need for DOWN_FAILED now. Off to find a resumable 
> machine...]

yeah, both DOWN_FAILED and UP_FAILED might trigger when some other bug 
prevents a resume.

	Ingo
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