From 6ec8a856e4097d42ece9b0b9459bbca1586f13d7 Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Sun, 19 Aug 2007 15:57:26 +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. Tested-by: Paolo Ornati Signed-off-by: Avi Kivity Signed-off-by: Linus Torvalds --- drivers/kvm/kvm_main.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index 96856097d15..cd0557954e5 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", -- 2.20.1