Re: 2.6.32.22 (amd64) domU Kernel doesnt boot - kernel panic

[Jeremy Fitzhardinge <jeremy@goop.org>]

 On 09/21/2010 03:02 AM, Giovanni Bellac wrote:
> Hello
>
> I have used my 2.6.32.20 config and compiled now a 2.6.32.22 from
> kernel.org.
> 2.6.32.22 has the important security fix (local user can be root with
> a exploit).

Does this help?

Thanks,
    J

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Date: Wed, 22 Sep 2010 15:28:52 -0700
Subject: [PATCH] xen: set up IRQ before binding virq to evtchn

Make sure the irq is set up before binding a virq event channel to it.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 3132a5e..cd17f86 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -426,6 +426,11 @@ static int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
 	irq = per_cpu(virq_to_irq, cpu)[virq];
 
 	if (irq == -1) {
+		irq = find_unbound_irq();
+
+		set_irq_chip_and_handler_name(irq, &xen_percpu_chip,
+					      handle_percpu_irq, "virq");
+
 		bind_virq.virq = virq;
 		bind_virq.vcpu = cpu;
 		if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq,
@@ -433,11 +438,6 @@ static int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
 			BUG();
 		evtchn = bind_virq.port;
 
-		irq = find_unbound_irq();
-
-		set_irq_chip_and_handler_name(irq, &xen_percpu_chip,
-					      handle_percpu_irq, "virq");
-
 		evtchn_to_irq[evtchn] = irq;
 		irq_info[irq] = mk_virq_info(evtchn, virq);