linux-kernel - Re: [tip:x86/debug] x86/kdump: No need to disable ioapic/ lapic in crash path

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Message-ID: <20120213221258.GP9751@redhat.com>
Date:	Mon, 13 Feb 2012 17:12:58 -0500
From:	Don Zickus <dzickus@...hat.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...hat.com, hpa@...or.com,
	torvalds@...ux-foundation.org, kexec@...ts.infradead.org,
	vgoyal@...hat.com, ebiederm@...ssion.com,
	akpm@...ux-foundation.org, tglx@...utronix.de, mingo@...e.hu,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/debug] x86/kdump: No need to disable ioapic/ lapic in
 crash path

On Mon, Feb 13, 2012 at 08:52:19AM -0800, Yinghai Lu wrote:
> On Mon, Feb 13, 2012 at 7:28 AM, Don Zickus <dzickus@...hat.com> wrote:
> > On Sat, Feb 11, 2012 at 05:04:15PM -0800, Yinghai Lu wrote:
> >> >
> >> > v2: removed the disable lapic code too
> >>
> >> with this commit, kdump is not working anymore on my setups with
> >> Nehalem, Westmere, sandbridge.
> >> these setup all have VT-d enabled.
> >
> > Hi Yinghai,
> >
> > Thanks for the report.  Can you attach the .config you were using and what
> > vendor you were using for Nehalem, Westmere and Sandybridge.  I'll try to
> > reproduce it in my lab.
> 
> Sure, please check attached one

Looks like I can reproduce the hang with my original patch and things work
when we stick the disable_local_APIC() back in there.  I'll keep poking.

Cheers,
Don
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