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

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Message-ID: <20070305082251.GA23366@elte.hu>
Date:	Mon, 5 Mar 2007 09:22:51 +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>, git@...r.kernel.org
Subject: Re: [patch] KVM: T60 resume fix


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

> > my T60 laptop does not resume correctly due to KVM attempting to 
> > send an IPI to a CPU that might be down (or not up yet). (Doing so 
> > also triggers the send_IPI_mask_bitmask() warning in 
> > arch/i386/kernel/smp.c, line 732.)
> >
> >with this fix applied my laptop does not hang during resume.
> >
> >[ KVM will have to disable/enable virtualization on the CPU itself 
> >  that goes down / comes up, not via an IPI sent from the requesting
> > CPU. ]

> 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?)

	Ingo
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