On Fri, May 23, 2025 at 04:27:14PM +0100, Mark Brown wrote:
> Since f916dd32a943 ("arm64/fpsimd: ptrace: Mandate SVE payload for
> streaming-mode state") we reject attempts to write to the streaming mode
> regset even if there is no register data supplied, causing the tests for
> setting vector lengths and setting SVE_VL_INHERIT in sve-ptrace to
> spuriously fail. Set the flag to avoid the issue, we still support not
> supplying register data.
>
> Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Mark.
> ---
> tools/testing/selftests/arm64/fp/sve-ptrace.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/arm64/fp/sve-ptrace.c b/tools/testing/selftests/arm64/fp/sve-ptrace.c
> index 7e259907805b..7f9b6a61d369 100644
> --- a/tools/testing/selftests/arm64/fp/sve-ptrace.c
> +++ b/tools/testing/selftests/arm64/fp/sve-ptrace.c
> @@ -170,7 +170,7 @@ static void ptrace_set_get_inherit(pid_t child, const struct vec_type *type)
> memset(&sve, 0, sizeof(sve));
> sve.size = sizeof(sve);
> sve.vl = sve_vl_from_vq(SVE_VQ_MIN);
> - sve.flags = SVE_PT_VL_INHERIT;
> + sve.flags = SVE_PT_VL_INHERIT | SVE_PT_REGS_SVE;
> ret = set_sve(child, type, &sve);
> if (ret != 0) {
> ksft_test_result_fail("Failed to set %s SVE_PT_VL_INHERIT\n",
> @@ -235,6 +235,7 @@ static void ptrace_set_get_vl(pid_t child, const struct vec_type *type,
> /* Set the VL by doing a set with no register payload */
> memset(&sve, 0, sizeof(sve));
> sve.size = sizeof(sve);
> + sve.flags = SVE_PT_REGS_SVE;
> sve.vl = vl;
> ret = set_sve(child, type, &sve);
> if (ret != 0) {
>
> --
> 2.39.5
>