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

Make kvm_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

@@ -110,8 +110,19 @@ int kvm_check_cap(long cap);
 #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);
+#define __kvm_ioctl(kvm_fd, cmd, arg) \
+	ioctl(kvm_fd, cmd, arg)
+
+static inline void _kvm_ioctl(int kvm_fd, unsigned long cmd, const char *name,
+			      void *arg)
+{
+	int ret = __kvm_ioctl(kvm_fd, cmd, arg);
+
+	TEST_ASSERT(!ret, __KVM_IOCTL_ERROR(name, ret));
+}
+
+#define kvm_ioctl(kvm_fd, cmd, arg) \
+	_kvm_ioctl(kvm_fd, cmd, #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);
@@ -492,6 +503,7 @@ unsigned int vm_get_page_size(struct kvm_vm *vm);
 unsigned int vm_get_page_shift(struct kvm_vm *vm);
 unsigned long vm_compute_max_gfn(struct kvm_vm *vm);
 uint64_t vm_get_max_gfn(struct kvm_vm *vm);
+int vm_get_kvm_fd(struct kvm_vm *vm);
 int vm_get_fd(struct kvm_vm *vm);
 
 unsigned int vm_calc_num_guest_pages(enum vm_guest_mode mode, size_t size);

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

@@ -1616,32 +1616,6 @@ void _vm_ioctl(struct kvm_vm *vm, unsigned long cmd, const char *name, void *arg
 	TEST_ASSERT(!ret, __KVM_IOCTL_ERROR(name, ret));
 }
 
-/*
- * KVM system ioctl
- *
- * Input Args:
- *   vm - Virtual Machine
- *   cmd - Ioctl number
- *   arg - Argument to pass to the ioctl
- *
- * Return: None
- *
- * Issues an arbitrary ioctl on a KVM fd.
- */
-void kvm_ioctl(struct kvm_vm *vm, unsigned long cmd, void *arg)
-{
-	int ret;
-
-	ret = ioctl(vm->kvm_fd, cmd, arg);
-	TEST_ASSERT(ret == 0, "KVM ioctl %lu failed, rc: %i errno: %i (%s)",
-		cmd, ret, errno, strerror(errno));
-}
-
-int __kvm_ioctl(struct kvm_vm *vm, unsigned long cmd, void *arg)
-{
-	return ioctl(vm->kvm_fd, cmd, arg);
-}
-
 /*
  * Device Ioctl
  */
@@ -2074,6 +2048,11 @@ uint64_t vm_get_max_gfn(struct kvm_vm *vm)
 	return vm->max_gfn;
 }
 
+int vm_get_kvm_fd(struct kvm_vm *vm)
+{
+	return vm->kvm_fd;
+}
+
 int vm_get_fd(struct kvm_vm *vm)
 {
 	return vm->fd;

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

@@ -123,7 +123,7 @@ void test_hv_cpuid_e2big(struct kvm_vm *vm, bool system)
 	if (!system)
 		ret = __vcpu_ioctl(vm, VCPU_ID, KVM_GET_SUPPORTED_HV_CPUID, &cpuid);
 	else
-		ret = __kvm_ioctl(vm, KVM_GET_SUPPORTED_HV_CPUID, &cpuid);
+		ret = __kvm_ioctl(vm_get_kvm_fd(vm), KVM_GET_SUPPORTED_HV_CPUID, &cpuid);
 
 	TEST_ASSERT(ret == -1 && errno == E2BIG,
 		    "%s KVM_GET_SUPPORTED_HV_CPUID didn't fail with -E2BIG when"