[Xen-changelog] Force RTC driver to fail to load in domU by preventing it

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 420db20e103c77ea0dbf443eb551db5d58371fdd
# Parent  446aa56ca4fee7d3ea2badfb59e8bb3540b507ae
Force RTC driver to fail to load in domU by preventing it
from binding to IRQ8.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>

diff -r 446aa56ca4fe -r 420db20e103c 
linux-2.6-xen-sparse/arch/xen/kernel/evtchn.c
--- a/linux-2.6-xen-sparse/arch/xen/kernel/evtchn.c     Mon Oct 17 12:50:28 2005
+++ b/linux-2.6-xen-sparse/arch/xen/kernel/evtchn.c     Mon Oct 17 13:02:36 2005
@@ -42,6 +42,7 @@
 #include <asm-xen/xen-public/physdev.h>
 #include <asm/hypervisor.h>
 #include <asm-xen/evtchn.h>
+#include <linux/mc146818rtc.h> /* RTC_IRQ */
 
 /*
  * This lock protects updates to the following mapping and reference-count
@@ -744,6 +745,13 @@
        {
                irq_bindcount[pirq_to_irq(i)] = 1;
 
+#ifdef RTC_IRQ
+               /* If not domain 0, force our RTC driver to fail its probe. */
+               if ((i == RTC_IRQ) &&
+                   !(xen_start_info->flags & SIF_INITDOMAIN))
+                       continue;
+#endif
+
                irq_desc[pirq_to_irq(i)].status  = IRQ_DISABLED;
                irq_desc[pirq_to_irq(i)].action  = 0;
                irq_desc[pirq_to_irq(i)].depth   = 1;

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