Re: [Xen-devel] 2.6.32.22 (amd64) domU Kernel doesnt boot - kernel panic

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

 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@xxxxxxxxxx>
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@xxxxxxxxxx>

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);
 



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