diff options
| author | Sean Christopherson <seanjc@google.com> | 2025-10-03 16:26:03 -0700 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2025-10-10 14:25:28 -0700 |
| commit | 505c953009ec8260870d41ef8109bb4c7e208e6f (patch) | |
| tree | 3edcbad3510ce52a1759f42e4b63090717faf499 /tools | |
| parent | 61cee97f40180312dcca9580a5be0b0aa2217f6e (diff) | |
KVM: selftests: Isolate the guest_memfd Copy-on-Write negative testcase
Move the guest_memfd Copy-on-Write (CoW) testcase to its own function to
better separate positive testcases from negative testcases.
No functional change intended.
Suggested-by: Ackerley Tng <ackerleytng@google.com>
Reviewed-by: Ackerley Tng <ackerleytng@google.com>
Tested-by: Ackerley Tng <ackerleytng@google.com>
Link: https://lore.kernel.org/r/20251003232606.4070510-11-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/testing/selftests/kvm/guest_memfd_test.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/tools/testing/selftests/kvm/guest_memfd_test.c b/tools/testing/selftests/kvm/guest_memfd_test.c index 319fda4f5d53..640636c76eb9 100644 --- a/tools/testing/selftests/kvm/guest_memfd_test.c +++ b/tools/testing/selftests/kvm/guest_memfd_test.c @@ -40,6 +40,14 @@ static void test_file_read_write(int fd, size_t total_size) "pwrite on a guest_mem fd should fail"); } +static void test_mmap_cow(int fd, size_t size) +{ + void *mem; + + mem = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0); + TEST_ASSERT(mem == MAP_FAILED, "Copy-on-write not allowed by guest_memfd."); +} + static void test_mmap_supported(int fd, size_t total_size) { const char val = 0xaa; @@ -47,9 +55,6 @@ static void test_mmap_supported(int fd, size_t total_size) size_t i; int ret; - mem = mmap(NULL, total_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0); - TEST_ASSERT(mem == MAP_FAILED, "Copy-on-write not allowed by guest_memfd."); - mem = kvm_mmap(total_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd); memset(mem, val, total_size); @@ -272,6 +277,7 @@ static void __test_guest_memfd(struct kvm_vm *vm, uint64_t flags) if (flags & GUEST_MEMFD_FLAG_MMAP) { gmem_test(mmap_supported, vm, flags); + gmem_test(mmap_cow, vm, flags); gmem_test(fault_overflow, vm, flags); } else { gmem_test(mmap_not_supported, vm, flags); |