arm64/sme: Implement ZA signal handling

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Implement support for ZA in signal handling in a very similar way to how
we implement support for SVE registers, using a signal context structure
with optional register state after it. Where present this register state
stores the ZA matrix as a series of horizontal vectors numbered from 0 to
VL/8 in the endinanness independent format used for vectors.

As with SVE we do not allow changes in the vector length during signal
return but we do allow ZA to be enabled or disabled.

Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20220419112247.711548-20-broonie@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Mark Brown 2022-04-19 12:22:27 +01:00 • committed by Catalin Marinas

parent 85ed24dad2

commit 39782210eb

3 changed files with 180 additions and 3 deletions

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41

arch/arm64/include/uapi/asm/sigcontext.h

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3

arch/arm64/kernel/fpsimd.c

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139

arch/arm64/kernel/signal.c

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