[PATCH RFC v4 33/44] KVM: selftests: Test that conversion to private does not support ZERO
From: Ackerley Tng <hidden>
Date: 2026-03-26 22:25:32
Also in:
kvm, linux-kselftest, linux-mm, linux-trace-kernel, lkml
Subsystem:
kernel selftest framework, kernel virtual machine (kvm), the rest · Maintainers:
Shuah Khan, Paolo Bonzini, Linus Torvalds
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 <redacted> --- .../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));
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2.53.0.1018.g2bb0e51243-goog