KVM: selftests: Stop hardcoding vCPU IDs in vcpu_width_config

In preparation for taking a vCPU pointer in vCPU-scoped functions, grab
the vCPU(s) created by __vm_vcpu_add() and use the ID from the vCPU
object instead of hardcoding the ID in ioctl() invocations.

Rename init1/init2 => init0/init1 to avoid having odd/confusing code
where vcpu0 consumes init1 and vcpu1 consumes init2.

Note, this change could easily be done when the functions are converted
in the future, and/or the vcpu{0,1} vs. init{1,2} discrepancy could be
ignored, but then there would be no opportunity to poke fun at the
1-based counting scheme.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

tools/testing/selftests/kvm/aarch64/vcpu_width_config.c

@@ -15,24 +15,25 @@
 
 
 /*
- * Add a vCPU, run KVM_ARM_VCPU_INIT with @init1, and then
- * add another vCPU, and run KVM_ARM_VCPU_INIT with @init2.
+ * Add a vCPU, run KVM_ARM_VCPU_INIT with @init0, and then
+ * add another vCPU, and run KVM_ARM_VCPU_INIT with @init1.
  */
-static int add_init_2vcpus(struct kvm_vcpu_init *init1,
-			   struct kvm_vcpu_init *init2)
+static int add_init_2vcpus(struct kvm_vcpu_init *init0,
+			   struct kvm_vcpu_init *init1)
 {
+	struct kvm_vcpu *vcpu0, *vcpu1;
 	struct kvm_vm *vm;
 	int ret;
 
 	vm = vm_create_barebones();
 
-	__vm_vcpu_add(vm, 0);
-	ret = __vcpu_ioctl(vm, 0, KVM_ARM_VCPU_INIT, init1);
+	vcpu0 = __vm_vcpu_add(vm, 0);
+	ret = __vcpu_ioctl(vm, vcpu0->id, KVM_ARM_VCPU_INIT, init0);
 	if (ret)
 		goto free_exit;
 
-	__vm_vcpu_add(vm, 1);
-	ret = __vcpu_ioctl(vm, 1, KVM_ARM_VCPU_INIT, init2);
+	vcpu1 = __vm_vcpu_add(vm, 1);
+	ret = __vcpu_ioctl(vm, vcpu1->id, KVM_ARM_VCPU_INIT, init1);
 
 free_exit:
 	kvm_vm_free(vm);
@@ -40,25 +41,26 @@ static int add_init_2vcpus(struct kvm_vcpu_init *init1,
 }
 
 /*
- * Add two vCPUs, then run KVM_ARM_VCPU_INIT for one vCPU with @init1,
- * and run KVM_ARM_VCPU_INIT for another vCPU with @init2.
+ * Add two vCPUs, then run KVM_ARM_VCPU_INIT for one vCPU with @init0,
+ * and run KVM_ARM_VCPU_INIT for another vCPU with @init1.
  */
-static int add_2vcpus_init_2vcpus(struct kvm_vcpu_init *init1,
-				  struct kvm_vcpu_init *init2)
+static int add_2vcpus_init_2vcpus(struct kvm_vcpu_init *init0,
+				  struct kvm_vcpu_init *init1)
 {
+	struct kvm_vcpu *vcpu0, *vcpu1;
 	struct kvm_vm *vm;
 	int ret;
 
 	vm = vm_create_barebones();
 
-	__vm_vcpu_add(vm, 0);
-	__vm_vcpu_add(vm, 1);
+	vcpu0 = __vm_vcpu_add(vm, 0);
+	vcpu1 = __vm_vcpu_add(vm, 1);
 
-	ret = __vcpu_ioctl(vm, 0, KVM_ARM_VCPU_INIT, init1);
+	ret = __vcpu_ioctl(vm, vcpu0->id, KVM_ARM_VCPU_INIT, init0);
 	if (ret)
 		goto free_exit;
 
-	ret = __vcpu_ioctl(vm, 1, KVM_ARM_VCPU_INIT, init2);
+	ret = __vcpu_ioctl(vm, vcpu1->id, KVM_ARM_VCPU_INIT, init1);
 
 free_exit:
 	kvm_vm_free(vm);
@@ -76,7 +78,7 @@ static int add_2vcpus_init_2vcpus(struct kvm_vcpu_init *init1,
  */
 int main(void)
 {
-	struct kvm_vcpu_init init1, init2;
+	struct kvm_vcpu_init init0, init1;
 	struct kvm_vm *vm;
 	int ret;
 
@@ -85,36 +87,36 @@ int main(void)
 		exit(KSFT_SKIP);
 	}
 
-	/* Get the preferred target type and copy that to init2 for later use */
+	/* Get the preferred target type and copy that to init1 for later use */
 	vm = vm_create_barebones();
-	vm_ioctl(vm, KVM_ARM_PREFERRED_TARGET, &init1);
+	vm_ioctl(vm, KVM_ARM_PREFERRED_TARGET, &init0);
 	kvm_vm_free(vm);
-	init2 = init1;
+	init1 = init0;
 
 	/* Test with 64bit vCPUs */
-	ret = add_init_2vcpus(&init1, &init1);
+	ret = add_init_2vcpus(&init0, &init0);
 	TEST_ASSERT(ret == 0,
 		    "Configuring 64bit EL1 vCPUs failed unexpectedly");
-	ret = add_2vcpus_init_2vcpus(&init1, &init1);
+	ret = add_2vcpus_init_2vcpus(&init0, &init0);
 	TEST_ASSERT(ret == 0,
 		    "Configuring 64bit EL1 vCPUs failed unexpectedly");
 
 	/* Test with 32bit vCPUs */
-	init1.features[0] = (1 << KVM_ARM_VCPU_EL1_32BIT);
-	ret = add_init_2vcpus(&init1, &init1);
+	init0.features[0] = (1 << KVM_ARM_VCPU_EL1_32BIT);
+	ret = add_init_2vcpus(&init0, &init0);
 	TEST_ASSERT(ret == 0,
 		    "Configuring 32bit EL1 vCPUs failed unexpectedly");
-	ret = add_2vcpus_init_2vcpus(&init1, &init1);
+	ret = add_2vcpus_init_2vcpus(&init0, &init0);
 	TEST_ASSERT(ret == 0,
 		    "Configuring 32bit EL1 vCPUs failed unexpectedly");
 
 	/* Test with mixed-width vCPUs  */
-	init1.features[0] = 0;
-	init2.features[0] = (1 << KVM_ARM_VCPU_EL1_32BIT);
-	ret = add_init_2vcpus(&init1, &init2);
+	init0.features[0] = 0;
+	init1.features[0] = (1 << KVM_ARM_VCPU_EL1_32BIT);
+	ret = add_init_2vcpus(&init0, &init1);
 	TEST_ASSERT(ret != 0,
 		    "Configuring mixed-width vCPUs worked unexpectedly");
-	ret = add_2vcpus_init_2vcpus(&init1, &init2);
+	ret = add_2vcpus_init_2vcpus(&init0, &init1);
 	TEST_ASSERT(ret != 0,
 		    "Configuring mixed-width vCPUs worked unexpectedly");