include/kvm/arm_psci.h

   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 #define KVM_ARM_PSCI_1_2        PSCI_VERSION(1, 2)
  18 #define KVM_ARM_PSCI_1_3        PSCI_VERSION(1, 3)
  19
  20 #define KVM_ARM_PSCI_LATEST     KVM_ARM_PSCI_1_3
  21
  22 static inline int kvm_psci_version(struct kvm_vcpu *vcpu)
  23 {
  24         /*
  25          * Our PSCI implementation stays the same across versions from
  26          * v0.2 onward, only adding the few mandatory functions (such
  27          * as FEATURES with 1.0) that are required by newer
  28          * revisions. It is thus safe to return the latest, unless
  29          * userspace has instructed us otherwise.
  30          */
  31         if (vcpu_has_feature(vcpu, KVM_ARM_VCPU_PSCI_0_2)) {
  32                 if (vcpu->kvm->arch.psci_version)
  33                         return vcpu->kvm->arch.psci_version;
  34
  35                 return KVM_ARM_PSCI_LATEST;
  36         }
  37
  38         return KVM_ARM_PSCI_0_1;
  39 }
  40
  41
  42 int kvm_psci_call(struct kvm_vcpu *vcpu);
  43
  44 #endif /* __KVM_ARM_PSCI_H__ */