Add a test that covers enabling and disabling of SVE vector length inheritance via the ptrace interface.

Signed-off-by: Mark Brown broonie@kernel.org --- tools/testing/selftests/arm64/fp/sve-ptrace.c | 55 ++++++++++++++++++- 1 file changed, 54 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/arm64/fp/sve-ptrace.c b/tools/testing/selftests/arm64/fp/sve-ptrace.c index ac0629f05365..c4417bc48d4f 100644 --- a/tools/testing/selftests/arm64/fp/sve-ptrace.c +++ b/tools/testing/selftests/arm64/fp/sve-ptrace.c @@ -22,7 +22,7 @@ #include "../../kselftest.h"

#define VL_TESTS (((SVE_VQ_MAX - SVE_VQ_MIN) + 1) * 3) -#define FPSIMD_TESTS 3 +#define FPSIMD_TESTS 5

#define EXPECTED_TESTS (VL_TESTS + FPSIMD_TESTS)

@@ -105,6 +105,56 @@ static int set_sve(pid_t pid, const struct user_sve_header *sve) return ptrace(PTRACE_SETREGSET, pid, NT_ARM_SVE, &iov); }

+/* Validate setting and getting the inherit flag */ +static void ptrace_set_get_inherit(pid_t child) +{ + struct user_sve_header sve; + struct user_sve_header *new_sve = NULL; + size_t new_sve_size = 0; + int ret; + + /* First set the flag */ + memset(&sve, 0, sizeof(sve)); + sve.size = sizeof(sve); + sve.vl = sve_vl_from_vq(SVE_VQ_MIN); + sve.flags = SVE_PT_VL_INHERIT; + ret = set_sve(child, &sve); + if (ret != 0) { + ksft_test_result_fail("Failed to set SVE_PT_VL_INHERIT\n"); + return; + } + + /* + * Read back the new register state and verify that we have + * set the flags we expected. + */ + if (!get_sve(child, (void **)&new_sve, &new_sve_size)) { + ksft_test_result_fail("Failed to read SVE flags\n"); + return; + } + + ksft_test_result(new_sve->flags & SVE_PT_VL_INHERIT, + "SVE_PT_VL_INHERIT set\n"); + + /* Now clear */ + sve.flags &= ~SVE_PT_VL_INHERIT; + ret = set_sve(child, &sve); + if (ret != 0) { + ksft_test_result_fail("Failed to clear SVE_PT_VL_INHERIT\n"); + return; + } + + if (!get_sve(child, (void **)&new_sve, &new_sve_size)) { + ksft_test_result_fail("Failed to read SVE flags\n"); + return; + } + + ksft_test_result(!(new_sve->flags & SVE_PT_VL_INHERIT), + "SVE_PT_VL_INHERIT cleared\n"); + + free(new_sve); +} + /* Validate attempting to set the specfied VL via ptrace */ static void ptrace_set_get_vl(pid_t child, unsigned int vl, bool *supported) { @@ -452,6 +502,9 @@ static int do_parent(pid_t child) /* FPSIMD via SVE regset */ ptrace_sve_fpsimd(child);

+ /* prctl() flags */ + ptrace_set_get_inherit(child); + /* Step through every possible VQ */ for (vq = SVE_VQ_MIN; vq <= SVE_VQ_MAX; vq++) { vl = sve_vl_from_vq(vq);