KVM: selftests: Make vm_ioctl() a wrapper to pretty print ioctl name

Make vm_ioctl() a macro wrapper and print the _name_ of the ioctl on
failure instead of the number.

Deliberately do not use __stringify(), as that will expand the ioctl all
the way down to its numerical sequence.  Again the intent is to print the
name of the macro.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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

@@ -105,6 +105,27 @@ int open_kvm_dev_path_or_exit(void);
 int kvm_check_cap(long cap);
 int vm_check_cap(struct kvm_vm *vm, long cap);
 int vm_enable_cap(struct kvm_vm *vm, struct kvm_enable_cap *cap);
+
+#define __KVM_SYSCALL_ERROR(_name, _ret) \
+	"%s failed, rc: %i errno: %i (%s)", (_name), (_ret), errno, strerror(errno)
+
+#define __KVM_IOCTL_ERROR(_name, _ret)	__KVM_SYSCALL_ERROR(_name, _ret)
+#define KVM_IOCTL_ERROR(_ioctl, _ret) __KVM_IOCTL_ERROR(#_ioctl, _ret)
+
+int __kvm_ioctl(struct kvm_vm *vm, unsigned long cmd, void *arg);
+void kvm_ioctl(struct kvm_vm *vm, unsigned long cmd, void *arg);
+
+int __vm_ioctl(struct kvm_vm *vm, unsigned long cmd, void *arg);
+void _vm_ioctl(struct kvm_vm *vm, unsigned long cmd, const char *name, void *arg);
+#define vm_ioctl(vm, cmd, arg) _vm_ioctl(vm, cmd, #cmd, arg)
+
+int __vcpu_ioctl(struct kvm_vm *vm, uint32_t vcpuid, unsigned long cmd,
+		 void *arg);
+void _vcpu_ioctl(struct kvm_vm *vm, uint32_t vcpuid, unsigned long cmd,
+		 const char *name, void *arg);
+#define vcpu_ioctl(vm, vcpuid, cmd, arg) \
+	_vcpu_ioctl(vm, vcpuid, cmd, #cmd, arg)
+
 void vm_enable_dirty_ring(struct kvm_vm *vm, uint32_t ring_size);
 const char *vm_guest_mode_string(uint32_t i);
 
@@ -156,23 +177,6 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm,
 	uint64_t guest_paddr, uint32_t slot, uint64_t npages,
 	uint32_t flags);
 
-#define __KVM_SYSCALL_ERROR(_name, _ret) \
-	"%s failed, rc: %i errno: %i (%s)", (_name), (_ret), errno, strerror(errno)
-
-#define __KVM_IOCTL_ERROR(_name, _ret)	__KVM_SYSCALL_ERROR(_name, _ret)
-#define KVM_IOCTL_ERROR(_ioctl, _ret) __KVM_IOCTL_ERROR(#_ioctl, _ret)
-
-void _vcpu_ioctl(struct kvm_vm *vm, uint32_t vcpuid, unsigned long ioctl,
-		 const char *name, void *arg);
-int __vcpu_ioctl(struct kvm_vm *vm, uint32_t vcpuid, unsigned long ioctl,
-		 void *arg);
-#define vcpu_ioctl(vm, vcpuid, ioctl, arg) \
-	_vcpu_ioctl(vm, vcpuid, ioctl, #ioctl, arg)
-
-void vm_ioctl(struct kvm_vm *vm, unsigned long ioctl, void *arg);
-int __vm_ioctl(struct kvm_vm *vm, unsigned long cmd, void *arg);
-void kvm_ioctl(struct kvm_vm *vm, unsigned long ioctl, void *arg);
-int __kvm_ioctl(struct kvm_vm *vm, unsigned long ioctl, void *arg);
 void vm_mem_region_set_flags(struct kvm_vm *vm, uint32_t slot, uint32_t flags);
 void vm_mem_region_move(struct kvm_vm *vm, uint32_t slot, uint64_t new_gpa);
 void vm_mem_region_delete(struct kvm_vm *vm, uint32_t slot);

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

@@ -1690,30 +1690,16 @@ void *vcpu_map_dirty_ring(struct kvm_vm *vm, uint32_t vcpuid)
 	return vcpu->dirty_gfns;
 }
 
-/*
- * VM Ioctl
- *
- * Input Args:
- *   vm - Virtual Machine
- *   cmd - Ioctl number
- *   arg - Argument to pass to the ioctl
- *
- * Return: None
- *
- * Issues an arbitrary ioctl on a VM fd.
- */
-void vm_ioctl(struct kvm_vm *vm, unsigned long cmd, void *arg)
+int __vm_ioctl(struct kvm_vm *vm, unsigned long cmd, void *arg)
 {
-	int ret;
-
-	ret = __vm_ioctl(vm, cmd, arg);
-	TEST_ASSERT(ret == 0, "vm ioctl %lu failed, rc: %i errno: %i (%s)",
-		cmd, ret, errno, strerror(errno));
+	return ioctl(vm->fd, cmd, arg);
 }
 
-int __vm_ioctl(struct kvm_vm *vm, unsigned long cmd, void *arg)
+void _vm_ioctl(struct kvm_vm *vm, unsigned long cmd, const char *name, void *arg)
 {
-	return ioctl(vm->fd, cmd, arg);
+	int ret = __vm_ioctl(vm, cmd, arg);
+
+	TEST_ASSERT(!ret, __KVM_IOCTL_ERROR(name, ret));
 }
 
 /*