>From f575e3d26dedce19ef9790c2ac0a5e7e17bcf2bd Mon Sep 17 00:00:00 2001 From: Peter Xu Date: Wed, 5 Apr 2023 14:20:18 -0400 Subject: [PATCH] selftests/mm: Add uffdio register ioctls test This new test tests against the returned ioctls from UFFDIO_REGISTER, where put into uffdio_register.ioctls. This also tests the expected failure cases of UFFDIO_REGISTER, aka: - Register with empty mode should fail with -EINVAL - Register anon without page cache (anon) should fail with -EINVAL Signed-off-by: Peter Xu --- tools/testing/selftests/mm/uffd-unit-tests.c | 111 ++++++++++++++++--- 1 file changed, 96 insertions(+), 15 deletions(-) diff --git a/tools/testing/selftests/mm/uffd-unit-tests.c b/tools/testing/selftests/mm/uffd-unit-tests.c index 37a844bafe19..88968ed5f57d 100644 --- a/tools/testing/selftests/mm/uffd-unit-tests.c +++ b/tools/testing/selftests/mm/uffd-unit-tests.c @@ -62,8 +62,14 @@ mem_type_t mem_types[] = { }, }; +/* Arguments to be passed over to each uffd unit test */ +struct uffd_test_args { + mem_type_t *mem_type; +}; +typedef struct uffd_test_args uffd_test_args_t; + /* Returns: UFFD_TEST_* */ -typedef void (*uffd_test_fn)(void); +typedef void (*uffd_test_fn)(uffd_test_args_t *); typedef struct { const char *name; @@ -172,8 +178,9 @@ static int test_uffd_api(bool use_dev) * This function initializes the global variables. TODO: remove global * vars and then remove this. */ -static int uffd_setup_environment(uffd_test_case_t *test, mem_type_t *mem_type, - const char **errmsg) +static int +uffd_setup_environment(uffd_test_args_t *args, uffd_test_case_t *test, + mem_type_t *mem_type, const char **errmsg) { map_shared = mem_type->shared; uffd_test_ops = mem_type->mem_ops; @@ -187,6 +194,9 @@ static int uffd_setup_environment(uffd_test_case_t *test, mem_type_t *mem_type, /* TODO: remove this global var.. it's so ugly */ nr_cpus = 1; + /* Initialize test arguments */ + args->mem_type = mem_type; + return uffd_test_ctx_init(test->uffd_feature_required, errmsg); } @@ -239,7 +249,7 @@ static int pagemap_test_fork(bool present) return result; } -static void uffd_wp_unpopulated_test(void) +static void uffd_wp_unpopulated_test(uffd_test_args_t *args) { uint64_t value; int pagemap_fd; @@ -285,7 +295,7 @@ static void uffd_wp_unpopulated_test(void) uffd_test_pass(); } -static void uffd_pagemap_test(void) +static void uffd_pagemap_test(uffd_test_args_t *args) { int pagemap_fd; uint64_t value; @@ -415,17 +425,17 @@ static void uffd_minor_test_common(bool test_collapse, bool test_wp) uffd_test_pass(); } -void uffd_minor_test(void) +void uffd_minor_test(uffd_test_args_t *args) { uffd_minor_test_common(false, false); } -void uffd_minor_wp_test(void) +void uffd_minor_wp_test(uffd_test_args_t *args) { uffd_minor_test_common(false, true); } -void uffd_minor_collapse_test(void) +void uffd_minor_collapse_test(uffd_test_args_t *args) { uffd_minor_test_common(true, false); } @@ -603,12 +613,12 @@ static void uffd_sigbus_test_common(bool wp) uffd_test_pass(); } -static void uffd_sigbus_test(void) +static void uffd_sigbus_test(uffd_test_args_t *args) { uffd_sigbus_test_common(false); } -static void uffd_sigbus_wp_test(void) +static void uffd_sigbus_wp_test(uffd_test_args_t *args) { uffd_sigbus_test_common(true); } @@ -651,12 +661,12 @@ static void uffd_events_test_common(bool wp) uffd_test_pass(); } -static void uffd_events_test(void) +static void uffd_events_test(uffd_test_args_t *args) { uffd_events_test_common(false); } -static void uffd_events_wp_test(void) +static void uffd_events_wp_test(uffd_test_args_t *args) { uffd_events_test_common(true); } @@ -724,7 +734,7 @@ uffd_register_detect_zp(int uffd, void *addr, uint64_t len) } /* exercise UFFDIO_ZEROPAGE */ -static void uffd_zeropage_test(void) +static void uffd_zeropage_test(uffd_test_args_t *args) { bool has_zeropage; int i; @@ -748,7 +758,76 @@ static void uffd_zeropage_test(void) uffd_test_pass(); } +/* + * Test the returned uffdio_register.ioctls with different register modes. + * Note that _UFFDIO_ZEROPAGE is tested separately in the zeropage test. + */ +static void +do_register_ioctls_test(uffd_test_args_t *args, bool miss, bool wp, bool minor) +{ + uint64_t ioctls = 0, expected = BIT_ULL(_UFFDIO_WAKE); + mem_type_t *mem_type = args->mem_type; + int ret; + + ret = uffd_register_with_ioctls(uffd, area_dst, page_size, + miss, wp, minor, &ioctls); + + /* + * Handle special cases of UFFDIO_REGISTER here where it should + * just fail with -EINVAL first.. + * + * Case 1: register MINOR on anon + * Case 2: register with no mode selected + */ + if ((minor && (mem_type->mem_flag == MEM_ANON)) || + (!miss && !wp && !minor)) { + if (ret != -EINVAL) + err("register (miss=%d, wp=%d, minor=%d) failed " + "with wrong errno=%d", miss, wp, minor, ret); + return; + } + + /* UFFDIO_REGISTER should succeed, then check ioctls returned */ + if (miss) + expected |= BIT_ULL(_UFFDIO_COPY); + if (wp) + expected |= BIT_ULL(_UFFDIO_WRITEPROTECT); + if (minor) + expected |= BIT_ULL(_UFFDIO_CONTINUE); + + if ((ioctls & expected) != expected) + err("unexpected uffdio_register.ioctls " + "(miss=%d, wp=%d, minor=%d): expected=0x%"PRIx64", " + "returned=0x%"PRIx64, miss, wp, minor, expected, ioctls); + + uffd_unregister(uffd, area_dst, page_size); +} + +static void uffd_register_ioctls_test(uffd_test_args_t *args) +{ + int miss, wp, minor; + + for (miss = 0; miss <= 1; miss++) + for (wp = 0; wp <= 1; wp++) + for (minor = 0; minor <= 1; minor++) + do_register_ioctls_test(args, miss, wp, minor); + + uffd_test_pass(); +} + uffd_test_case_t uffd_tests[] = { + { + /* Test returned uffdio_register.ioctls. */ + .name = "register-ioctls", + .uffd_fn = uffd_register_ioctls_test, + .mem_targets = MEM_ALL, + .uffd_feature_required = UFFD_FEATURE_MISSING_HUGETLBFS | + UFFD_FEATURE_MISSING_SHMEM | + UFFD_FEATURE_PAGEFAULT_FLAG_WP | + UFFD_FEATURE_WP_HUGETLBFS_SHMEM | + UFFD_FEATURE_MINOR_HUGETLBFS | + UFFD_FEATURE_MINOR_SHMEM, + }, { .name = "zeropage", .uffd_fn = uffd_zeropage_test, @@ -835,6 +914,7 @@ int main(int argc, char *argv[]) int n_mems = sizeof(mem_types) / sizeof(mem_type_t); uffd_test_case_t *test; mem_type_t *mem_type; + uffd_test_args_t args; char test_name[128]; const char *errmsg; int has_uffd; @@ -862,11 +942,12 @@ int main(int argc, char *argv[]) uffd_test_skip("feature missing"); continue; } - if (uffd_setup_environment(test, mem_type, &errmsg)) { + if (uffd_setup_environment(&args, test, mem_type, + &errmsg)) { uffd_test_skip(errmsg); continue; } - test->uffd_fn(); + test->uffd_fn(&args); } } -- 2.39.1