arm64/signal: Flush FPSIMD register state when disabling streaming mode

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commit ea64baacbc upstream.

When handling a signal delivered to a context with streaming mode enabled
we will disable streaming mode for the signal handler, when doing so we
should also flush the saved FPSIMD register state like exiting streaming
mode in the hardware would do so that if that state is reloaded we get the
same behaviour. Without this we will reload whatever the last FPSIMD state
that was saved for the task was.

Fixes: 40a8e87bb3 ("arm64/sme: Disable ZA and streaming mode when handling signals")
Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20220817182324.638214-3-broonie@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Mark Brown 2022-08-17 19:23:22 +01:00 • committed by Greg Kroah-Hartman

parent f83cbd14c7

commit 913fe86ae9

1 changed files with 10 additions and 0 deletions

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arch/arm64/kernel/signal.c

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