arm64/sve: In-kernel vector length availability query interface

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KVM will need to interrogate the set of SVE vector lengths
available on the system.

This patch exposes the relevant bits to the kernel, along with a
sve_vq_available() helper to check whether a particular vector
length is supported.

__vq_to_bit() and __bit_to_vq() are not intended for use outside
these functions: now that these are exposed outside fpsimd.c, they
are prefixed with __ in order to provide an extra hint that they
are not intended for general-purpose use.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: zhang.lei <zhang.lei@jp.fujitsu.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

...

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Dave Martin 2018-09-28 14:39:21 +01:00 • committed by Marc Zyngier

parent 8e3c54c8b6

commit ead9e430c0

2 changed files with 37 additions and 27 deletions

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29

arch/arm64/include/asm/fpsimd.h

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35

arch/arm64/kernel/fpsimd.c

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