KVM: selftests: Convert kvm_pv_test away from VCPU_ID

Convert kvm_pv_test to use vm_create_with_one_vcpu() and pass arounda
'struct kvm_vcpu' object instead of using a global VCPU_ID.

Opportunistically use vcpu_run() instead of _vcpu_run() with an open
coded assert that KVM_RUN succeeded.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

tools/testing/selftests/kvm/x86_64/kvm_pv_test.c

@@ -171,24 +171,18 @@ static void handle_abort(struct ucall *uc)
 		  __FILE__, uc->args[1]);
 }
 
-#define VCPU_ID 0
-
-static void enter_guest(struct kvm_vm *vm)
+static void enter_guest(struct kvm_vcpu *vcpu)
 {
-	struct kvm_run *run;
+	struct kvm_run *run = vcpu->run;
 	struct ucall uc;
-	int r;
-
-	run = vcpu_state(vm, VCPU_ID);
 
 	while (true) {
-		r = _vcpu_run(vm, VCPU_ID);
-		TEST_ASSERT(!r, "vcpu_run failed: %d\n", r);
+		vcpu_run(vcpu->vm, vcpu->id);
 		TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
 			    "unexpected exit reason: %u (%s)",
 			    run->exit_reason, exit_reason_str(run->exit_reason));
 
-		switch (get_ucall(vm, VCPU_ID, &uc)) {
+		switch (get_ucall(vcpu->vm, vcpu->id, &uc)) {
 		case UCALL_PR_MSR:
 			pr_msr(&uc);
 			break;
@@ -207,6 +201,7 @@ static void enter_guest(struct kvm_vm *vm)
 int main(void)
 {
 	struct kvm_cpuid2 *best;
+	struct kvm_vcpu *vcpu;
 	struct kvm_vm *vm;
 
 	if (!kvm_check_cap(KVM_CAP_ENFORCE_PV_FEATURE_CPUID)) {
@@ -214,18 +209,18 @@ int main(void)
 		exit(KSFT_SKIP);
 	}
 
-	vm = vm_create_default(VCPU_ID, 0, guest_main);
+	vm = vm_create_with_one_vcpu(&vcpu, guest_main);
 
-	vcpu_enable_cap(vm, VCPU_ID, KVM_CAP_ENFORCE_PV_FEATURE_CPUID, 1);
+	vcpu_enable_cap(vm, vcpu->id, KVM_CAP_ENFORCE_PV_FEATURE_CPUID, 1);
 
 	best = kvm_get_supported_cpuid();
 	clear_kvm_cpuid_features(best);
-	vcpu_set_cpuid(vm, VCPU_ID, best);
+	vcpu_set_cpuid(vm, vcpu->id, best);
 
 	vm_init_descriptor_tables(vm);
-	vcpu_init_descriptor_tables(vm, VCPU_ID);
+	vcpu_init_descriptor_tables(vm, vcpu->id);
 	vm_install_exception_handler(vm, GP_VECTOR, guest_gp_handler);
 
-	enter_guest(vm);
+	enter_guest(vcpu);
 	kvm_vm_free(vm);
 }