arm64: cpufeature: Add helper to test for CPU feature overrides

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Add some helpers to extract and apply feature overrides to the bare
idreg values. This involves inspecting the value and mask of the
specific field that we are interested in, given that an override
value/mask pair might be invalid for one field but valid for another.

Then, wire up the new helper for the hVHE test - note that we can drop
the sysreg test here, as the override will be invalid when trying to
enable hVHE on non-VHE capable hardware.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20240214122845.2033971-55-ardb+git@google.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Ard Biesheuvel 2024-02-14 13:28:56 +01:00 • committed by Catalin Marinas

parent 8a6e40e1f6

commit 35876f35f4

2 changed files with 40 additions and 8 deletions

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39

arch/arm64/include/asm/cpufeature.h

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9

arch/arm64/kernel/cpufeature.c

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