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Re: [Xen-devel] x86_64 smp kernel panic

To: "Nakajima, Jun" <jun.nakajima@xxxxxxxxx>
Subject: Re: [Xen-devel] x86_64 smp kernel panic
From: Steven Hand <Steven.Hand@xxxxxxxxxxxx>
Date: Tue, 07 Feb 2006 17:45:36 +0000
Cc: Ryan Grimm <grimm@xxxxxxxxxx>, Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx>
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In-reply-to: Message from "Nakajima, Jun" <jun.nakajima@xxxxxxxxx> of "Tue, 07 Feb 2006 09:13:58 PST." <7F740D512C7C1046AB53446D3720017306CEAE3B@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
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> Stephen C. Tweedie wrote:
> > Hi,
> > 
> > On Fri, 2006-02-03 at 09:44 -0600, Ryan Grimm wrote:
> > 
> >> I tried the patch you pointed out but still get the same result.  I
> >> turned off 'detect_soft_lockups', and get the message below.
> > 
> > I'm also completely unable to get x86_64 to work at all from any tree
> > with CONFIG_SMP set.  I get a cpu_up notifier chain panic if
> > CONFIG_HOTPLUG_CPU is not set; with CONFIG_HOTPLUG_CPU=y, it doesn't
> > even compile.  Replacing one missing function in setup64-xen.c fixes
> > that for dom0 but domU is more complex.
> > 
> > If nobody's working on this, I'll take a stab at trying to sort things
> > out so that at least one config set works for x86_64 SMP.  It's
> > really a rather important use case!
> > 
> > --Stephen
> > 
> > 
> Restoring x86_64 SMP is high priority, and you should be very welcome.
> Please take a look at Christian's latest fix 8775; it may have fixed
> that. I'm working on other things now.

I can confirm that 8775 fixes SMP dom0 on 64 for me (the main problem 
was the cpu_possible_map which is why CONFIG_HOTPLUG_CPU worked - it 
prefills the possible_map to NR_CPUs)



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