kselftest/arm64: Add a test case for SVE VL changes with SME active
We just fixed an issue where changing the SVE VL while SME was active could result in us attempting to save the streaming mode SVE vectors without any backing storage. Add a test case which provokes that issue, ideally we should also verify that the contents of ZA are unaffected by any of what we did. Note that since we need to keep streaming mode enabled we can't use any syscalls to trigger the issue, we have to sit in a loop in usersapce and hope to be preempted. The chosen numbers trigger with defconfig on all the virtual platforms for me, this won't be 100% on all systems but avoid an overcomplicated test implementation. Signed-off-by:Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20230720-arm64-fix-sve-sme-vl-change-v2-2-8eea06b82d57@kernel.org Signed-off-by:
Will Deacon <will@kernel.org>
parent
6eaae198
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