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kselftest/arm64: Fix SVE write data generation for SME only systems 

fp-ptrace does not handle SME only systems correctly when generating data,
on SME only systems scenarios where we are not in streaming mode will not
have an expected vector length. This leads to attempts to do memcpy()s of
zero byte arrays which can crash, fix this by skipping generation of SVE
data for cases where we do not expect to have an active vector length.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250718-arm64-fp-ptrace-sme-only-v1-2-3b96dd19a503@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Mark Brown 2025-07-18 23:14:51 +01:00 committed by Catalin Marinas
parent b021f45d39
commit aa7d3c8bc2
1 changed files with 6 additions and 0 deletions
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6
tools/testing/selftests/arm64/fp/fp-ptrace.c
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@ -1151,6 +1151,9 @@ static void sve_write_expected(struct test_config *config)
int vl = vl_expected(config);
int sme_vq = __sve_vq_from_vl(config->sme_vl_expected);
if (!vl)
return;
fill_random(z_expected, __SVE_ZREGS_SIZE(__sve_vq_from_vl(vl)));
fill_random(p_expected, __SVE_PREGS_SIZE(__sve_vq_from_vl(vl)));
@ -1178,6 +1181,9 @@ static void sve_write_sve(pid_t child, struct test_config *config)
vl = vl_expected(config);
vq = __sve_vq_from_vl(vl);
if (!vl)
return;
iov.iov_len = SVE_PT_SVE_OFFSET + SVE_PT_SVE_SIZE(vq, SVE_PT_REGS_SVE);
iov.iov_base = malloc(iov.iov_len);
if (!iov.iov_base) {