1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2012,2013 - ARM Ltd 4 * Author: Marc Zyngier <marc.zyngier@arm.com> 5 */ 6 7 #ifndef __KVM_ARM_PSCI_H__ 8 #define __KVM_ARM_PSCI_H__ 9 10 #include <linux/kvm_host.h> 11 #include <uapi/linux/psci.h> 12 13 #define KVM_ARM_PSCI_0_1 PSCI_VERSION(0, 1) 14 #define KVM_ARM_PSCI_0_2 PSCI_VERSION(0, 2) 15 #define KVM_ARM_PSCI_1_0 PSCI_VERSION(1, 0) 16 #define KVM_ARM_PSCI_1_1 PSCI_VERSION(1, 1) 17 18 #define KVM_ARM_PSCI_LATEST KVM_ARM_PSCI_1_1 19 20 static inline int kvm_psci_version(struct kvm_vcpu *vcpu) 21 { 22 /* 23 * Our PSCI implementation stays the same across versions from 24 * v0.2 onward, only adding the few mandatory functions (such 25 * as FEATURES with 1.0) that are required by newer 26 * revisions. It is thus safe to return the latest, unless 27 * userspace has instructed us otherwise. 28 */ 29 if (vcpu_has_feature(vcpu, KVM_ARM_VCPU_PSCI_0_2)) { 30 if (vcpu->kvm->arch.psci_version) 31 return vcpu->kvm->arch.psci_version; 32 33 return KVM_ARM_PSCI_LATEST; 34 } 35 36 return KVM_ARM_PSCI_0_1; 37 } 38 39 40 int kvm_psci_call(struct kvm_vcpu *vcpu); 41 42 #endif /* __KVM_ARM_PSCI_H__ */ 43