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KVM: cleanup (physical) CPU hotplug 

Remove the useless argument, and do not do anything if there are no
VMs running at the time of the hotplug.

Cc: kvm@vger.kernel.org
Cc: gleb@redhat.com
Cc: jan.kiszka@siemens.com
Reviewed-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-09-10 12:57:17 +02:00
parent feaf0c7dc4
commit 4fa92fb25a
1 changed files with 8 additions and 9 deletions
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17
virt/kvm/kvm_main.c
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@ -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);
}
@ -2748,20 +2750,17 @@ static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
{
int cpu = (long)v;
if (!kvm_usage_count)
return NOTIFY_OK;
val &= ~CPU_TASKS_FROZEN;
switch (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;