From: Marc Zyngier <maz@kernel.org> To: kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: James Morse <james.morse@arm.com>, Suzuki K Poulose <suzuki.poulose@arm.com>, Oliver Upton <oliver.upton@linux.dev>, Zenghui Yu <yuzenghui@huawei.com>, Joey Gouly <joey.gouly@arm.com>, Fuad Tabba <tabba@google.com>, Mostafa Saleh <smostafa@google.com>, Will Deacon <will@kernel.org>, Catalin Marinas <catalin.marinas@arm.com> Subject: [PATCH v4 11/15] KVM: arm64: nv: Add kvm_has_pauth() helper Date: Fri, 19 Apr 2024 11:29:31 +0100 [thread overview] Message-ID: <20240419102935.1935571-12-maz@kernel.org> (raw) In-Reply-To: <20240419102935.1935571-1-maz@kernel.org> 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). Signed-off-by: Marc Zyngier <maz@kernel.org> --- arch/arm64/include/asm/kvm_host.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 5566191d646a..ed4d82017b87 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__ */ -- 2.39.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
WARNING: multiple messages have this Message-ID (diff)
From: Marc Zyngier <maz@kernel.org> To: kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: James Morse <james.morse@arm.com>, Suzuki K Poulose <suzuki.poulose@arm.com>, Oliver Upton <oliver.upton@linux.dev>, Zenghui Yu <yuzenghui@huawei.com>, Joey Gouly <joey.gouly@arm.com>, Fuad Tabba <tabba@google.com>, Mostafa Saleh <smostafa@google.com>, Will Deacon <will@kernel.org>, Catalin Marinas <catalin.marinas@arm.com> Subject: [PATCH v4 11/15] KVM: arm64: nv: Add kvm_has_pauth() helper Date: Fri, 19 Apr 2024 11:29:31 +0100 [thread overview] Message-ID: <20240419102935.1935571-12-maz@kernel.org> (raw) In-Reply-To: <20240419102935.1935571-1-maz@kernel.org> 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). Signed-off-by: Marc Zyngier <maz@kernel.org> --- arch/arm64/include/asm/kvm_host.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 5566191d646a..ed4d82017b87 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__ */ -- 2.39.2
next prev parent reply other threads:[~2024-04-19 10:30 UTC|newest] Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-04-19 10:29 [PATCH v4 00/15] KVM/arm64: Add NV support for ERET and PAuth Marc Zyngier 2024-04-19 10:29 ` Marc Zyngier 2024-04-19 10:29 ` [PATCH v4 01/15] KVM: arm64: Harden __ctxt_sys_reg() against out-of-range values Marc Zyngier 2024-04-19 10:29 ` Marc Zyngier 2024-04-19 10:29 ` [PATCH v4 02/15] KVM: arm64: Add helpers for ESR_ELx_ERET_ISS_ERET* Marc Zyngier 2024-04-19 10:29 ` Marc Zyngier 2024-04-19 10:29 ` [PATCH v4 03/15] KVM: arm64: Constraint PAuth support to consistent implementations Marc Zyngier 2024-04-19 10:29 ` Marc Zyngier 2024-04-19 10:29 ` [PATCH v4 04/15] KVM: arm64: nv: Drop VCPU_HYP_CONTEXT flag Marc Zyngier 2024-04-19 10:29 ` Marc Zyngier 2024-04-19 10:29 ` [PATCH v4 05/15] KVM: arm64: nv: Configure HCR_EL2 for FEAT_NV2 Marc Zyngier 2024-04-19 10:29 ` Marc Zyngier 2024-04-19 10:29 ` [PATCH v4 06/15] KVM: arm64: nv: Add trap forwarding for ERET and SMC Marc Zyngier 2024-04-19 10:29 ` Marc Zyngier 2024-04-19 10:29 ` [PATCH v4 07/15] KVM: arm64: nv: Fast-track 'InHost' exception returns Marc Zyngier 2024-04-19 10:29 ` Marc Zyngier 2024-04-19 10:29 ` [PATCH v4 08/15] KVM: arm64: nv: Honor HFGITR_EL2.ERET being set Marc Zyngier 2024-04-19 10:29 ` Marc Zyngier 2024-04-19 10:29 ` [PATCH v4 09/15] KVM: arm64: nv: Handle HCR_EL2.{API,APK} independently Marc Zyngier 2024-04-19 10:29 ` Marc Zyngier 2024-04-19 10:29 ` [PATCH v4 10/15] KVM: arm64: nv: Reinject PAC exceptions caused by HCR_EL2.API==0 Marc Zyngier 2024-04-19 10:29 ` Marc Zyngier 2024-04-19 10:29 ` Marc Zyngier [this message] 2024-04-19 10:29 ` [PATCH v4 11/15] KVM: arm64: nv: Add kvm_has_pauth() helper Marc Zyngier 2024-04-19 10:29 ` [PATCH v4 12/15] KVM: arm64: nv: Add emulation for ERETAx instructions Marc Zyngier 2024-04-19 10:29 ` Marc Zyngier 2024-04-23 9:22 ` Jon Hunter 2024-04-23 9:22 ` Jon Hunter 2024-04-23 9:40 ` Zenghui Yu 2024-04-23 9:40 ` Zenghui Yu 2024-04-23 11:42 ` Marc Zyngier 2024-04-23 11:42 ` Marc Zyngier 2024-04-23 12:30 ` Jon Hunter 2024-04-23 12:30 ` Jon Hunter 2024-04-23 12:09 ` Jon Hunter 2024-04-23 12:09 ` Jon Hunter 2024-04-19 10:29 ` [PATCH v4 13/15] KVM: arm64: nv: Handle ERETA[AB] instructions Marc Zyngier 2024-04-19 10:29 ` Marc Zyngier 2024-04-19 10:29 ` [PATCH v4 14/15] KVM: arm64: nv: Advertise support for PAuth Marc Zyngier 2024-04-19 10:29 ` Marc Zyngier 2024-04-19 10:29 ` [PATCH v4 15/15] KVM: arm64: Drop trapping of PAuth instructions/keys Marc Zyngier 2024-04-19 10:29 ` Marc Zyngier 2024-04-19 17:59 ` [PATCH v4 00/15] KVM/arm64: Add NV support for ERET and PAuth Oliver Upton 2024-04-19 17:59 ` Oliver Upton 2024-04-20 11:49 ` Marc Zyngier 2024-04-20 11:49 ` Marc Zyngier 2024-04-20 12:18 ` Marc Zyngier 2024-04-20 12:18 ` Marc Zyngier
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