KVM: selftests: Use vm_create_with_vcpus() in max_guest_memory_test

Use vm_create_with_vcpus() in max_guest_memory_test and reference vCPUs
by their 'struct kvm_vcpu' object instead of their ID.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

tools/testing/selftests/kvm/max_guest_memory_test.c

@@ -28,8 +28,7 @@ static void guest_code(uint64_t start_gpa, uint64_t end_gpa, uint64_t stride)
 }
 
 struct vcpu_info {
-	struct kvm_vm *vm;
-	uint32_t id;
+	struct kvm_vcpu *vcpu;
 	uint64_t start_gpa;
 	uint64_t end_gpa;
 };
@@ -60,12 +59,13 @@ static void run_vcpu(struct kvm_vm *vm, uint32_t vcpu_id)
 
 static void *vcpu_worker(void *data)
 {
-	struct vcpu_info *vcpu = data;
+	struct vcpu_info *info = data;
+	struct kvm_vcpu *vcpu = info->vcpu;
 	struct kvm_vm *vm = vcpu->vm;
 	struct kvm_sregs sregs;
 	struct kvm_regs regs;
 
-	vcpu_args_set(vm, vcpu->id, 3, vcpu->start_gpa, vcpu->end_gpa,
+	vcpu_args_set(vm, vcpu->id, 3, info->start_gpa, info->end_gpa,
 		      vm_get_page_size(vm));
 
 	/* Snapshot regs before the first run. */
@@ -89,8 +89,8 @@ static void *vcpu_worker(void *data)
 	return NULL;
 }
 
-static pthread_t *spawn_workers(struct kvm_vm *vm, uint64_t start_gpa,
-				uint64_t end_gpa)
+static pthread_t *spawn_workers(struct kvm_vm *vm, struct kvm_vcpu **vcpus,
+				uint64_t start_gpa, uint64_t end_gpa)
 {
 	struct vcpu_info *info;
 	uint64_t gpa, nr_bytes;
@@ -108,8 +108,7 @@ static pthread_t *spawn_workers(struct kvm_vm *vm, uint64_t start_gpa,
 	TEST_ASSERT(nr_bytes, "C'mon, no way you have %d CPUs", nr_vcpus);
 
 	for (i = 0, gpa = start_gpa; i < nr_vcpus; i++, gpa += nr_bytes) {
-		info[i].vm = vm;
-		info[i].id = i;
+		info[i].vcpu = vcpus[i];
 		info[i].start_gpa = gpa;
 		info[i].end_gpa = gpa + nr_bytes;
 		pthread_create(&threads[i], NULL, vcpu_worker, &info[i]);
@@ -172,6 +171,7 @@ int main(int argc, char *argv[])
 	uint64_t max_gpa, gpa, slot_size, max_mem, i;
 	int max_slots, slot, opt, fd;
 	bool hugepages = false;
+	struct kvm_vcpu **vcpus;
 	pthread_t *threads;
 	struct kvm_vm *vm;
 	void *mem;
@@ -215,7 +215,10 @@ int main(int argc, char *argv[])
 		}
 	}
 
-	vm = vm_create_default_with_vcpus(nr_vcpus, 0, 0, guest_code, NULL);
+	vcpus = malloc(nr_vcpus * sizeof(*vcpus));
+	TEST_ASSERT(vcpus, "Failed to allocate vCPU array");
+
+	vm = vm_create_with_vcpus(nr_vcpus, guest_code, vcpus);
 
 	max_gpa = vm_get_max_gfn(vm) << vm_get_page_shift(vm);
 	TEST_ASSERT(max_gpa > (4 * slot_size), "MAXPHYADDR <4gb ");
@@ -252,7 +255,10 @@ int main(int argc, char *argv[])
 	}
 
 	atomic_set(&rendezvous, nr_vcpus + 1);
-	threads = spawn_workers(vm, start_gpa, gpa);
+	threads = spawn_workers(vm, vcpus, start_gpa, gpa);
+
+	free(vcpus);
+	vcpus = NULL;
 
 	pr_info("Running with %lugb of guest memory and %u vCPUs\n",
 		(gpa - start_gpa) / size_1gb, nr_vcpus);