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
  17 #define KVM_ARM_PSCI_LATEST     KVM_ARM_PSCI_1_0
  18
  19 /*
  20  * We need the KVM pointer independently from the vcpu as we can call
  21  * this from HYP, and need to apply kern_hyp_va on it...
  22  */
  23 static inline int kvm_psci_version(struct kvm_vcpu *vcpu, struct kvm *kvm)
  24 {
  25         /*
  26          * Our PSCI implementation stays the same across versions from
  27          * v0.2 onward, only adding the few mandatory functions (such
  28          * as FEATURES with 1.0) that are required by newer
  29          * revisions. It is thus safe to return the latest, unless
  30          * userspace has instructed us otherwise.
  31          */
  32         if (test_bit(KVM_ARM_VCPU_PSCI_0_2, vcpu->arch.features)) {
  33                 if (vcpu->kvm->arch.psci_version)
  34                         return vcpu->kvm->arch.psci_version;
  35
  36                 return KVM_ARM_PSCI_LATEST;
  37         }
  38
  39         return KVM_ARM_PSCI_0_1;
  40 }
  41
  42
  43 int kvm_psci_call(struct kvm_vcpu *vcpu);
  44
  45 struct kvm_one_reg;
  46
  47 int kvm_arm_get_fw_num_regs(struct kvm_vcpu *vcpu);
  48 int kvm_arm_copy_fw_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices);
  49 int kvm_arm_get_fw_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
  50 int kvm_arm_set_fw_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
  51
  52 #endif /* __KVM_ARM_PSCI_H__ */