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arm64: KVM: Enable Common Not Private translations

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We rely on cpufeature framework to detect and enable CNP so for KVM we
need to patch hyp to set CNP bit just before TTBR0_EL2 gets written.

For the guest we encode CNP bit while building vttbr, so we don't need
to bother with that in a world switch.

Reviewed-by: James Morse <james.morse@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Vladimir Murzin
2018-07-31 14:08:57 +01:00
committed by Catalin Marinas
parent 5ffdfaedfa
commit ab510027dc
6 changed files with 17 additions and 2 deletions
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5
arch/arm64/include/asm/kvm_mmu.h
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@@ -517,5 +517,10 @@ static inline int hyp_map_aux_data(void)
#define kvm_phys_to_vttbr(addr) phys_to_ttbr(addr)
static inline bool kvm_cpu_has_cnp(void)
{
return system_supports_cnp();
}
#endif /* __ASSEMBLY__ */
#endif /* __ARM64_KVM_MMU_H__ */