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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Ackerley Tng wrote: > Ira Weiny writes: > > > Ackerley Tng wrote: > >> Test that GUEST_MEMFD_FLAG_INIT_PRIVATE is only valid when > >> GUEST_MEMFD_FLAG_SUPPORT_SHARED is set. > >> > >> Change-Id: I506e236a232047cfaee17bcaed02ee14c8d25bbb > >> Signed-off-by: Ackerley Tng > >> --- > >> .../testing/selftests/kvm/guest_memfd_test.c | 36 ++++++++++++------- > >> 1 file changed, 24 insertions(+), 12 deletions(-) > >> > >> diff --git a/tools/testing/selftests/kvm/guest_memfd_test.c b/tools/testing/selftests/kvm/guest_memfd_test.c > >> index 60aaba5808a5..bf2876cbd711 100644 > >> --- a/tools/testing/selftests/kvm/guest_memfd_test.c > >> +++ b/tools/testing/selftests/kvm/guest_memfd_test.c > >> @@ -401,13 +401,31 @@ static void test_with_type(unsigned long vm_type, uint64_t guest_memfd_flags, > >> kvm_vm_release(vm); > >> } > >> > >> +static void test_vm_with_gmem_flag(struct kvm_vm *vm, uint64_t flag, > >> + bool expect_valid) > >> +{ > >> + size_t page_size = getpagesize(); > >> + int fd; > >> + > >> + fd = __vm_create_guest_memfd(vm, page_size, flag); > >> + > >> + if (expect_valid) { > >> + TEST_ASSERT(fd > 0, > >> + "guest_memfd() with flag '0x%lx' should be valid", > >> + flag); > >> + close(fd); > >> + } else { > >> + TEST_ASSERT(fd == -1 && errno == EINVAL, > >> + "guest_memfd() with flag '0x%lx' should fail with EINVAL", > >> + flag); > >> + } > >> +} > >> + > >> static void test_vm_type_gmem_flag_validity(unsigned long vm_type, > >> uint64_t expected_valid_flags) > >> { > >> - size_t page_size = getpagesize(); > >> struct kvm_vm *vm; > >> uint64_t flag = 0; > >> - int fd; > >> > >> if (!(kvm_check_cap(KVM_CAP_VM_TYPES) & BIT(vm_type))) > >> return; > >> @@ -415,17 +433,11 @@ static void test_vm_type_gmem_flag_validity(unsigned long vm_type, > >> vm = vm_create_barebones_type(vm_type); > >> > >> for (flag = BIT(0); flag; flag <<= 1) { > >> - fd = __vm_create_guest_memfd(vm, page_size, flag); > >> + test_vm_with_gmem_flag(vm, flag, flag & expected_valid_flags); > >> > >> - if (flag & expected_valid_flags) { > >> - TEST_ASSERT(fd > 0, > >> - "guest_memfd() with flag '0x%lx' should be valid", > >> - flag); > >> - close(fd); > >> - } else { > >> - TEST_ASSERT(fd == -1 && errno == EINVAL, > >> - "guest_memfd() with flag '0x%lx' should fail with EINVAL", > >> - flag); > >> + if (flag == GUEST_MEMFD_FLAG_SUPPORT_SHARED) { > >> + test_vm_with_gmem_flag( > >> + vm, flag | GUEST_MEMFD_FLAG_INIT_PRIVATE, true); > > > > I don't understand the point of this check. In 2/51 we set > > GUEST_MEMFD_FLAG_INIT_PRIVATE when GUEST_MEMFD_FLAG_SUPPORT_SHARED is set. > > > > When can this check ever fail? > > > > Ira > > In 02/51, GUEST_MEMFD_FLAG_INIT_PRIVATE is not set by default, > GUEST_MEMFD_FLAG_INIT_PRIVATE is set as one of the valid_flags. Ah My mistake I read that too quickly. Thanks, Ira > > The intention is that GUEST_MEMFD_FLAG_INIT_PRIVATE is only valid if > GUEST_MEMFD_FLAG_SUPPORT_SHARED is requested by userspace. > > In this test, the earlier part before the if block calls > test_vm_with_gmem_flag() all valid flags, and that already tests > GUEST_MEMFD_FLAG_SUPPORT_SHARED individually. > > Specifically if GUEST_MEMFD_FLAG_SUPPORT_SHARED is set, this if block > adds a test for when both GUEST_MEMFD_FLAG_SUPPORT_SHARED and > GUEST_MEMFD_FLAG_INIT_PRIVATE are set, and sets that expect_valid is > true. > > This second test doesn't fail, it is meant to check that the kernel > allows the pair of flags to be set. Hope that makes sense.