From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ingo Molnar <mingo@elte.hu>
Subject: Re: [patch] KVM: T60 resume fix
Date: Mon, 5 Mar 2007 09:22:51 +0100
Message-ID: <20070305082251.GA23366@elte.hu>
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To: Avi Kivity <avi@qumranet.com>
Cc: Daniel Walker <dwalker@mvista.com>, Michal Piotrowski <michal.k.k.piotrowski@gmail.com>, linux-pm@lists.osdl.org, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Adrian Bunk <bunk@stusta.de>, Pavel Machek <pavel@ucw.cz>, Jens Axboe <jens.axboe@oracle.com>, "Michael S. Tsirkin" <mst@mellanox.co.il>, Thomas Gleixner <tglx@linutronix.de>, Linus Torvalds <torvalds@linux-foundation.org>, Andrew Morton <akpm@linux-foundation.org>, git@vger.kernel.org
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* Avi Kivity <avi@qumranet.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