>From a8c346b28695b938018f4bafd458f6d3e70c36e3 Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Sun, 19 Aug 2007 13:51:00 +0300 Subject: [PATCH] KVM: Avoid calling smp_call_function_single() with interrupts disabled When taking a cpu down, we need to hardware_disable() it. Unfortunately, the CPU_DYING notifier is called with interrupts disabled, which means we can't use smp_call_function_single(). Fortunately, the CPU_DYING notifier is always called on the dying cpu, so we don't need to use the function at all and can simply call hardware_disable() directly. Signed-off-by: Avi Kivity --- drivers/kvm/kvm_main.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index 9685609..cd05579 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -2974,6 +2974,10 @@ static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, switch (val) { case CPU_DYING: case CPU_DYING_FROZEN: + printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", + cpu); + hardware_disable(NULL); + break; case CPU_UP_CANCELED: case CPU_UP_CANCELED_FROZEN: printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", -- 1.5.2.4