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KVM: arm64: nv: Add kvm_has_pauth() helper

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Pointer Authentication comes in many flavors, and a faithful emulation
relies on correctly handling the flavour implemented by the HW.

For this, provide a new kvm_has_pauth() that checks whether we
expose to the guest a particular level of support. This checks
across all 3 possible authentication algorithms (Q5, Q3 and IMPDEF).

Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20240419102935.1935571-12-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2024-04-19 11:29:31 +01:00
parent 15db034733
commit 719f5206a8
1 changed files with 15 additions and 0 deletions
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15
arch/arm64/include/asm/kvm_host.h
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@ -1336,4 +1336,19 @@ bool kvm_arm_vcpu_stopped(struct kvm_vcpu *vcpu);
(get_idreg_field((kvm), id, fld) >= expand_field_sign(id, fld, min) && \
get_idreg_field((kvm), id, fld) <= expand_field_sign(id, fld, max))
/* Check for a given level of PAuth support */
#define kvm_has_pauth(k, l) \
({ \
bool pa, pi, pa3; \
\
pa = kvm_has_feat((k), ID_AA64ISAR1_EL1, APA, l); \
pa &= kvm_has_feat((k), ID_AA64ISAR1_EL1, GPA, IMP); \
pi = kvm_has_feat((k), ID_AA64ISAR1_EL1, API, l); \
pi &= kvm_has_feat((k), ID_AA64ISAR1_EL1, GPI, IMP); \
pa3 = kvm_has_feat((k), ID_AA64ISAR2_EL1, APA3, l); \
pa3 &= kvm_has_feat((k), ID_AA64ISAR2_EL1, GPA3, IMP); \
\
(pa + pi + pa3) == 1; \
})
#endif /* __ARM64_KVM_HOST_H__ */