# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1274265548 -3600
# Node ID a6f24be72f667b2a339b6412dcebe72d94d757a9
# Parent abc9f8e809e555b00d16a94fa4a1635803591fc9
x86 nmi: Enable/disable dynamically on each CPU during hotplug.
Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
---
xen/arch/x86/nmi.c | 33 +++++++++++++++++++++++++++++----
1 files changed, 29 insertions(+), 4 deletions(-)
diff -r abc9f8e809e5 -r a6f24be72f66 xen/arch/x86/nmi.c
--- a/xen/arch/x86/nmi.c Wed May 19 11:15:26 2010 +0100
+++ b/xen/arch/x86/nmi.c Wed May 19 11:39:08 2010 +0100
@@ -24,6 +24,7 @@
#include <xen/console.h>
#include <xen/smp.h>
#include <xen/keyhandler.h>
+#include <xen/cpu.h>
#include <asm/current.h>
#include <asm/mc146818rtc.h>
#include <asm/msr.h>
@@ -353,6 +354,32 @@ void __pminit setup_apic_nmi_watchdog(vo
nmi_active = 1;
}
+static int cpu_nmi_callback(
+ struct notifier_block *nfb, unsigned long action, void *hcpu)
+{
+ unsigned int cpu = (unsigned long)hcpu;
+
+ switch ( action )
+ {
+ case CPU_UP_PREPARE:
+ init_timer(&per_cpu(nmi_timer, cpu), nmi_timer_fn, NULL, cpu);
+ set_timer(&per_cpu(nmi_timer, cpu), NOW());
+ break;
+ case CPU_UP_CANCELED:
+ case CPU_DEAD:
+ kill_timer(&per_cpu(nmi_timer, cpu));
+ break;
+ default:
+ break;
+ }
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block cpu_nmi_nfb = {
+ .notifier_call = cpu_nmi_callback
+};
+
static DEFINE_PER_CPU(unsigned int, last_irq_sums);
static DEFINE_PER_CPU(unsigned int, alert_counter);
@@ -377,10 +404,8 @@ void watchdog_enable(void)
* setup because the timer infrastructure is not available.
*/
for_each_online_cpu ( cpu )
- {
- init_timer(&per_cpu(nmi_timer, cpu), nmi_timer_fn, NULL, cpu);
- set_timer(&per_cpu(nmi_timer, cpu), NOW());
- }
+ cpu_nmi_callback(&cpu_nmi_nfb, CPU_UP_PREPARE, (void *)(long)cpu);
+ register_cpu_notifier(&cpu_nmi_nfb);
}
void nmi_watchdog_tick(struct cpu_user_regs * regs)
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