Remove the useless argument, and do not do anything if there are no
VMs running at the time of the hotplug.
Cc: stable@xxxxxxxxxxxxxxx
Cc: kvm@xxxxxxxxxxxxxxx
Cc: gleb@xxxxxxxxxx
Cc: jan.kiszka@xxxxxxxxxxx
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
virt/kvm/kvm_main.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 979bff4..75522b3 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2681,10 +2681,11 @@ static void hardware_enable_nolock(void *junk)
}
}
-static void hardware_enable(void *junk)
+static void hardware_enable(void)
{
raw_spin_lock(&kvm_lock);
- hardware_enable_nolock(junk);
+ if (kvm_usage_count)
+ hardware_enable_nolock(NULL);
raw_spin_unlock(&kvm_lock);
}
@@ -2698,10 +2699,11 @@ static void hardware_disable_nolock(void *junk)
kvm_arch_hardware_disable(NULL);
}
-static void hardware_disable(void *junk)
+static void hardware_disable(void)
{
raw_spin_lock(&kvm_lock);
- hardware_disable_nolock(junk);
+ if (kvm_usage_count)
+ hardware_disable_nolock(NULL);
raw_spin_unlock(&kvm_lock);
}
@@ -2756,12 +2758,12 @@ static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
case CPU_DYING:
printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
cpu);
- hardware_disable(NULL);
+ hardware_disable();
break;
case CPU_STARTING:
printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
cpu);
- hardware_enable(NULL);
+ hardware_enable();
break;
}
return NOTIFY_OK;
--
1.8.3.1
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