KVM: selftests: Add __vcpu_run() helper

Add __vcpu_run() so that tests that want to avoid asserts on KVM_RUN
failures don't need to open code the ioctl() call.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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

@@ -55,10 +55,8 @@ static void guest_code(void)
 static int run_vcpu(struct kvm_vm *vm, uint32_t vcpuid)
 {
 	ucall_init(vm, NULL);
-	int ret = __vcpu_ioctl(vm, vcpuid, KVM_RUN, NULL);
-	if (ret)
-		return -errno;
-	return 0;
+
+	return __vcpu_run(vm, vcpuid) ? -errno : 0;
 }
 
 static struct vm_gic vm_gic_create_with_vcpus(uint32_t gic_dev_type, uint32_t nr_vcpus)

tools/testing/selftests/kvm/dirty_log_test.c

@@ -509,7 +509,7 @@ static void generate_random_array(uint64_t *guest_array, uint64_t size)
 
 static void *vcpu_worker(void *data)
 {
-	int ret, vcpu_fd;
+	int ret;
 	struct kvm_vm *vm = data;
 	uint64_t *guest_array;
 	uint64_t pages_count = 0;
@@ -517,8 +517,6 @@ static void *vcpu_worker(void *data)
 						 + sizeof(sigset_t));
 	sigset_t *sigset = (sigset_t *) &sigmask->sigset;
 
-	vcpu_fd = vcpu_get_fd(vm, VCPU_ID);
-
 	/*
 	 * SIG_IPI is unblocked atomically while in KVM_RUN.  It causes the
 	 * ioctl to return with -EINTR, but it is still pending and we need
@@ -539,7 +537,7 @@ static void *vcpu_worker(void *data)
 		generate_random_array(guest_array, TEST_PAGES_PER_LOOP);
 		pages_count += TEST_PAGES_PER_LOOP;
 		/* Let the guest dirty the random pages */
-		ret = ioctl(vcpu_fd, KVM_RUN, NULL);
+		ret = __vcpu_run(vm, VCPU_ID);
 		if (ret == -1 && errno == EINTR) {
 			int sig = -1;
 			sigwait(sigset, &sig);

tools/testing/selftests/kvm/include/kvm_util_base.h

@@ -208,6 +208,12 @@ vm_paddr_t addr_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva);
 struct kvm_run *vcpu_state(struct kvm_vm *vm, uint32_t vcpuid);
 void vcpu_run(struct kvm_vm *vm, uint32_t vcpuid);
 int _vcpu_run(struct kvm_vm *vm, uint32_t vcpuid);
+
+static inline int __vcpu_run(struct kvm_vm *vm, uint32_t vcpuid)
+{
+	return __vcpu_ioctl(vm, vcpuid, KVM_RUN, NULL);
+}
+
 int vcpu_get_fd(struct kvm_vm *vm, uint32_t vcpuid);
 void vcpu_run_complete_io(struct kvm_vm *vm, uint32_t vcpuid);
 struct kvm_reg_list *vcpu_get_reg_list(struct kvm_vm *vm, uint32_t vcpuid);

tools/testing/selftests/kvm/lib/kvm_util.c

@@ -1597,12 +1597,10 @@ void vcpu_run(struct kvm_vm *vm, uint32_t vcpuid)
 
 int _vcpu_run(struct kvm_vm *vm, uint32_t vcpuid)
 {
-	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
 	int rc;
 
-	TEST_ASSERT(vcpu != NULL, "vcpu not found, vcpuid: %u", vcpuid);
 	do {
-		rc = ioctl(vcpu->fd, KVM_RUN, NULL);
+		rc = __vcpu_run(vm, vcpuid);
 	} while (rc == -1 && errno == EINTR);
 
 	assert_on_unhandled_exception(vm, vcpuid);
@@ -1627,7 +1625,7 @@ void vcpu_run_complete_io(struct kvm_vm *vm, uint32_t vcpuid)
 	TEST_ASSERT(vcpu != NULL, "vcpu not found, vcpuid: %u", vcpuid);
 
 	vcpu->state->immediate_exit = 1;
-	ret = ioctl(vcpu->fd, KVM_RUN, NULL);
+	ret = __vcpu_run(vm, vcpuid);
 	vcpu->state->immediate_exit = 0;
 
 	TEST_ASSERT(ret == -1 && errno == EINTR,