kselftest/arm64: Specify SVE data when testing VL set in sve-ptrace

[ Upstream commit 9e8ebfe677f9101bbfe1f75d548a5aec581e8213 ]

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.

Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250609-kselftest-arm64-ssve-fixups-v2-3-998fcfa6f240@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/tools/testing/selftests/arm64/fp/sve-ptrace.c b/tools/testing/selftests/arm64/fp/sve-ptrace.c
index c6228176dd1a0c750d7fd94f82138766d88ec6b0..408fb1c5c2f856f53026371197cae8501024dafa 100644 (file)
--- a/tools/testing/selftests/arm64/fp/sve-ptrace.c
+++ b/tools/testing/selftests/arm64/fp/sve-ptrace.c
@@ -168,7 +168,7 @@ 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",
@@ -233,6 +233,7 @@ 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) {