KVM: Ensure CPU is stable during low level hardware enable/disable

Use the non-raw smp_processor_id() in the low hardware enable/disable
helpers as KVM absolutely relies on the CPU being stable, e.g. KVM would
end up with incorrect state if the task were migrated between accessing
cpus_hardware_enabled and actually enabling/disabling hardware.

Signed-off-by: Sean Christopherson <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>

Author: sean-jc

virt/kvm/kvm_main.c

@@ -5097,7 +5097,7 @@ static struct miscdevice kvm_dev = {
 
 static void hardware_enable_nolock(void *junk)
 {
-	int cpu = raw_smp_processor_id();
+	int cpu = smp_processor_id();
 	int r;
 
 	if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
@@ -5139,7 +5139,7 @@ static int kvm_online_cpu(unsigned int cpu)
 
 static void hardware_disable_nolock(void *junk)
 {
-	int cpu = raw_smp_processor_id();
+	int cpu = smp_processor_id();
 
 	if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
 		return;