arm64/sme: Save and restore streaming mode over EFI runtime calls

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When saving and restoring the floating point state over an EFI runtime
call ensure that we handle streaming mode, only handling FFR if we are not
in streaming mode and ensuring that we are in normal mode over the call
into runtime services.

We currently assume that ZA will not be modified by runtime services, the
specification is not yet finalised so this may need updating if that
changes.

Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20220419112247.711548-24-broonie@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Mark Brown 2022-04-19 12:22:31 +01:00 • committed by Catalin Marinas

parent d45d7ff704

commit e0838f6373

1 changed files with 42 additions and 6 deletions

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arch/arm64/kernel/fpsimd.c

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