arm64: Add hypervisor safe helper for checking constant capabilities

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The hypervisor may not have full access to the kernel data structures
and hence cannot safely use cpus_have_cap() helper for checking the
system capability. Add a safe helper for hypervisors to check a constant
system capability, which *doesn't* fall back to checking the bitmap
maintained by the kernel. With this, make the cpus_have_cap() only
check the bitmask and force constant cap checks to use the new API
for quicker checks.

Cc: Robert Ritcher <rritcher@cavium.com>
Cc: Tirumalesh Chalamarla <tchalamarla@cavium.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Suzuki K Poulose 2016-11-08 13:56:20 +00:00 • committed by Catalin Marinas

parent c02433dd6d

commit a4023f6827

4 changed files with 15 additions and 21 deletions

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19

arch/arm64/include/asm/cpufeature.h

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2

arch/arm64/kernel/cpufeature.c

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2

arch/arm64/kernel/process.c

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13

drivers/irqchip/irq-gic-v3.c

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