[PATCH v10 1/5] KVM: arm64: Add a vcpu flag to control ptrauth for guest
From: Amit Daniel Kachhap <hidden>
Date: 2019-04-23 04:43:00
Also in:
kvmarm, lkml
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
A per vcpu flag is added to check if pointer authentication is enabled for the vcpu or not. This flag may be enabled according to the necessary user policies and host capabilities. This patch also adds a helper to check the flag. Reviewed-by: Dave Martin <Dave.Martin@arm.com> Signed-off-by: Amit Daniel Kachhap <redacted> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Marc Zyngier <redacted> Cc: Christoffer Dall <redacted> Cc: kvmarm@lists.cs.columbia.edu --- Changes since v9: * Added ptrauth cpufeature static check in vcpu_has_ptrauth [Marc Zyngier]. arch/arm64/include/asm/kvm_host.h | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 7a096fd..7ccac42 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h@@ -355,10 +355,15 @@ struct kvm_vcpu_arch { #define KVM_ARM64_HOST_SVE_ENABLED (1 << 4) /* SVE enabled for EL0 */ #define KVM_ARM64_GUEST_HAS_SVE (1 << 5) /* SVE exposed to guest */ #define KVM_ARM64_VCPU_SVE_FINALIZED (1 << 6) /* SVE config completed */ +#define KVM_ARM64_GUEST_HAS_PTRAUTH (1 << 7) /* PTRAUTH exposed to guest */ #define vcpu_has_sve(vcpu) (system_supports_sve() && \ ((vcpu)->arch.flags & KVM_ARM64_GUEST_HAS_SVE)) +#define vcpu_has_ptrauth(vcpu) ((system_supports_address_auth() || \ + system_supports_generic_auth()) && \ + ((vcpu)->arch.flags & KVM_ARM64_GUEST_HAS_PTRAUTH)) + #define vcpu_gp_regs(v) (&(v)->arch.ctxt.gp_regs) /*
--
2.7.4
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