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kselftest/arm64: Cover disabling streaming mode without SVE in fp-ptrace 

On a system which support SME but not SVE we can now disable streaming mode
via ptrace by writing FPSIMD formatted data through NT_ARM_SVE with a VL of
0. Extend fp-ptrace to cover rather than skip these cases, relax the check
for SVE writes of FPSIMD format data to not skip if SME is supported and
accept 0 as the VL when performing the ptrace write.

Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Mark Brown 2025-10-15 18:56:38 +01:00 committed by Catalin Marinas
parent eb9df6d69a
commit a0245b42f8
1 changed files with 1 additions and 4 deletions
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5
tools/testing/selftests/arm64/fp/fp-ptrace.c
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@ -1071,7 +1071,7 @@ static bool sve_write_supported(struct test_config *config)
static bool sve_write_fpsimd_supported(struct test_config *config)
{
if (!sve_supported())
if (!sve_supported() && !sme_supported())
return false;
if ((config->svcr_in & SVCR_ZA) != (config->svcr_expected & SVCR_ZA))
@ -1231,9 +1231,6 @@ static void sve_write_fpsimd(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_SIZE(vq, SVE_PT_REGS_FPSIMD);
iov.iov_base = malloc(iov.iov_len);
if (!iov.iov_base) {