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]>
CachyOS · Dec 29, 2022 · 2c106f2 · 2c106f2
1 parent e4aa7f8
commit 2c106f2
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/virt/kvm/kvm_main.c b/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;