arm64: Add ARM64_HAS_LPA2 CPU capability

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Expose FEAT_LPA2 as a capability so that we can take advantage of
alternatives patching in the hypervisor.

Although FEAT_LPA2 presence is advertised separately for stage1 and
stage2, the expectation is that in practice both stages will either
support or not support it. Therefore, we combine both into a single
capability, allowing us to simplify the implementation. KVM requires
support in both stages in order to use LPA2 since the same library is
used for hyp stage 1 and guest stage 2 pgtables.

Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20231127111737.1897081-6-ryan.roberts@arm.com

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Ryan Roberts 2023-11-27 11:17:30 +00:00 • committed by Marc Zyngier

parent e477c8c483

commit b1366d21da

3 changed files with 45 additions and 0 deletions

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5

arch/arm64/include/asm/cpufeature.h

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arch/arm64/kernel/cpufeature.c

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arch/arm64/tools/cpucaps

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