KVM: Consolidate arch specific vcpu ioctl locking

Now that all arch specific ioctls have centralized locking, it is easy to
move it to the central dispatcher.
Signed-off-by: NAvi Kivity <avi@redhat.com>

arch/powerpc/kvm/powerpc.c

@@ -512,17 +512,16 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
 	void __user *argp = (void __user *)arg;
 	long r;
 
-	if (ioctl == KVM_INTERRUPT) {
+	switch (ioctl) {
+	case KVM_INTERRUPT: {
 		struct kvm_interrupt irq;
 		r = -EFAULT;
 		if (copy_from_user(&irq, argp, sizeof(irq)))
-			goto out_nolock;
+			goto out;
 		r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
-		goto out_nolock;
+		goto out;
 	}
 
-	vcpu_load(vcpu);
-	switch (ioctl) {
 	case KVM_ENABLE_CAP:
 	{
 		struct kvm_enable_cap cap;
@@ -537,8 +536,6 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
 	}
 
 out:
-	vcpu_put(vcpu);
-out_nolock:
 	return r;
 }
 

arch/s390/kvm/kvm-s390.c

@@ -638,16 +638,16 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
 	void __user *argp = (void __user *)arg;
 	long r;
 
-	if (ioctl == KVM_S390_INTERRUPT) {
+	switch (ioctl) {
+	case KVM_S390_INTERRUPT: {
 		struct kvm_s390_interrupt s390int;
 
+		r = -EFAULT;
 		if (copy_from_user(&s390int, argp, sizeof(s390int)))
-			return -EFAULT;
-		return kvm_s390_inject_vcpu(vcpu, &s390int);
+			break;
+		r = kvm_s390_inject_vcpu(vcpu, &s390int);
+		break;
 	}
-
-	vcpu_load(vcpu);
-	switch (ioctl) {
 	case KVM_S390_STORE_STATUS:
 		r = kvm_s390_vcpu_store_status(vcpu, arg);
 		break;
@@ -666,7 +666,6 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
 	default:
 		r = -EINVAL;
 	}
-	vcpu_put(vcpu);
 	return r;
 }
 

arch/x86/kvm/x86.c

@@ -2298,7 +2298,6 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
 	int r;
 	struct kvm_lapic_state *lapic = NULL;
 
-	vcpu_load(vcpu);
 	switch (ioctl) {
 	case KVM_GET_LAPIC: {
 		r = -EINVAL;
@@ -2496,7 +2495,6 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
 		r = -EINVAL;
 	}
 out:
-	vcpu_put(vcpu);
 	kfree(lapic);
 	return r;
 }

virt/kvm/kvm_main.c

@@ -1578,9 +1578,7 @@ static long kvm_vcpu_ioctl(struct file *filp,
 		break;
 	}
 	default:
-		vcpu_put(vcpu);
 		r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
-		vcpu_load(vcpu);
 	}
 out:
 	vcpu_put(vcpu);