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 <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
---
Linus, please apply to -rc.
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
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