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Re: [Xen-devel] 2.6.37 dom0 under Xen 4.1 clocksource not working

To: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] 2.6.37 dom0 under Xen 4.1 clocksource not working
From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Date: Wed, 26 Jan 2011 17:07:27 +0000
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On Wed, 26 Jan 2011, Daniel De Graaf wrote:
> On 01/26/2011 10:40 AM, Jeremy Fitzhardinge wrote:
> > On 01/10/2011 07:06 AM, Daniel De Graaf wrote:
> >> When booting 2.6.37 (from kernel.org) under Xen 4.1, there are
> >> apparently issues with timer interrupts being delivered to the dom0.
> >> Repeatedly causing an interrupt (for example, the ACPI power button) will
> >> allow the system to boot, as does adding "clocksource=jiffies" to the
> >> kernel command line. This is only present under Xen, not when booting the
> >> same kernel on real hardware.
> > 
> > Ah, yes.  This is from the cpuidle stuff, I think.  Does booting with
> > "idle=halt" work?
> > 
> Yes, clocksource=xen idle=halt works.

I have a testbox that can reproduce this problem.
It seems to be caused by the cpuidle driver that overrides pm_idle
unless boot_option_idle_override is set to something other than the
This patch fixes the problem for me:


diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index a3d28a1..7e85979 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -353,6 +353,7 @@ void __init xen_arch_setup(void)
        boot_cpu_data.hlt_works_ok = 1;
        pm_idle = default_idle;
+       boot_option_idle_override = IDLE_HALT;

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