[PATCH RFC v4 33/44] KVM: selftests: Test that conversion to private does not support ZERO

[Ackerley Tng]

Test that conversion to private specifying the
KVM_SET_MEMORY_ATTRIBUTES2_ZERO flag returns -1 and sets errno to
EOPNOTSUPP.

Signed-off-by: Ackerley Tng <ackerley...@google.com>
---
 .../testing/selftests/kvm/guest_memfd_conversions_test.c  | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/tools/testing/selftests/kvm/guest_memfd_conversions_test.c 
b/tools/testing/selftests/kvm/guest_memfd_conversions_test.c
index 4ccd3d515bb26..c0abc69f15332 100644
--- a/tools/testing/selftests/kvm/guest_memfd_conversions_test.c
+++ b/tools/testing/selftests/kvm/guest_memfd_conversions_test.c
@@ -488,6 +488,21 @@ 
GMEM_CONVERSION_MULTIPAGE_TEST_INIT_SHARED(elevated_refcount, 4)
        }
 }
 
+GMEM_CONVERSION_TEST_INIT_SHARED(convert_to_private_does_not_support_zero)
+{
+       const loff_t start_offset = 0;
+       loff_t error_offset = -1ul;
+       int ret;
+
+       ret = __gmem_set_private(t->gmem_fd, start_offset, nr_pages * page_size,
+                                &error_offset,
+                                KVM_SET_MEMORY_ATTRIBUTES2_ZERO);
+
+       TEST_ASSERT_EQ(ret, -1);
+       TEST_ASSERT_EQ(errno, EOPNOTSUPP);
+       TEST_ASSERT_EQ(error_offset, start_offset);
+}
+
 int main(int argc, char *argv[])
 {
        TEST_REQUIRE(kvm_check_cap(KVM_CAP_VM_TYPES) & 
BIT(KVM_X86_SW_PROTECTED_VM));

-- 
2.53.0.1018.g2bb0e51243-goog