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

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commit ea64baacbc36a0d552aec0d87107182f40211131 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: 40a8e87bb328 ("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>
This commit is contained in:
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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10
arch/arm64/kernel/signal.c
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@ -922,6 +922,16 @@ static void setup_return(struct pt_regs *regs, struct k_sigaction *ka,
/* Signal handlers are invoked with ZA and streaming mode disabled */
if (system_supports_sme()) {
/*
* If we were in streaming mode the saved register
* state was SVE but we will exit SM and use the
* FPSIMD register state - flush the saved FPSIMD
* register state in case it gets loaded.
*/
if (current->thread.svcr & SVCR_SM_MASK)
memset(&current->thread.uw.fpsimd_state, 0,
sizeof(current->thread.uw.fpsimd_state));
current->thread.svcr &= ~(SVCR_ZA_MASK |
SVCR_SM_MASK);
sme_smstop();