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| author | Marc Zyngier <maz@kernel.org> | 2024-04-19 11:29:31 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2024-04-20 12:42:51 +0100 |
| commit | 719f5206a8fd8336d23ccda6fe2a3287fbfb4c92 (patch) | |
| tree | 09cbde41fcccd0498c600a0cf01e3b4795e138bd /arch/arm64/include | |
| parent | 15db034733e4df3ca8ab4bf0a593a8a9b4860541 (diff) | |
| download | linux-719f5206a8fd8336d23ccda6fe2a3287fbfb4c92.tar.gz linux-719f5206a8fd8336d23ccda6fe2a3287fbfb4c92.tar.bz2 linux-719f5206a8fd8336d23ccda6fe2a3287fbfb4c92.zip | |
KVM: arm64: nv: Add kvm_has_pauth() helper
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>
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/kvm_host.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 465cfd49cf7e..a6ba90daa195 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -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__ */ |