linux-kernel - Re: Xen domU kernel no longer shuts down (Was Linux 2.6.32.26)

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Message-ID: <AANLkTikFaxnO3_xYWGGW9gEA6XPVM0pMpMqz-hpEHN_6@mail.gmail.com>
Date:	Mon, 29 Nov 2010 13:37:56 -0800
From:	Alok Kataria <alokkataria1@...il.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	"Alan J. Wylie" <alan@...ie.me.uk>, Greg KH <gregkh@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Sander Eikelenboom <linux@...elenboom.it>, akataria@...are.com
Subject: Re: Xen domU kernel no longer shuts down (Was Linux 2.6.32.26)

[resending my reply, apologies if you get it twice]

On Mon, Nov 29, 2010 at 1:35 PM, Alok Kataria <alokkataria1@...il.com> wrote:
>
>
> On Fri, Nov 26, 2010 at 2:38 PM, Jeremy Fitzhardinge <jeremy@...p.org> wrote:
>>
>> On 11/26/2010 06:07 AM, Alan J. Wylie wrote:
>> > Greg KH <gregkh@...e.de> writes:
>> >
>> >> I'm announcing the release of the 2.6.32.26 kernel.
>> > ...
>> >
>> >> Alok Kataria (1):
>> >>       x86, kexec: Make sure to stop all CPUs before exiting the kernel
>> > This patch (ae832c21a08514fd11d2d1d6e217c8a537764bb0) stops my Xen DomU from
>> > shutting down iff vcpus in the xen config file is > 1.
>> >
>> > Simply reverting the commit gets things working properly again.
>>
>> Thanks for confirming this.  I had seen the same thing and suspected
>> this change, but hadn't investigated it yet.
>
>
> To get the old behavior back for Xen you can replace this call
> smp_call_function(stop_self, NULL, wait);
>
>  in  xen_stop_other_cpus with
>
> smp_call_function(stop_self, NULL, 0);
>
> That should fix your hang and fallback to the original behavior, though please note that there might still be a fundamental problem about why some of the AP's don't respond to stop_send IPI on XEN.
>
> Alok
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