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Thomas Gleixnercaab2772019-06-03 07:44:50 +02001/* SPDX-License-Identifier: GPL-2.0-only */
Marc Zyngierdcd2e402012-12-12 18:52:05 +00002/*
3 * Copyright (C) 2012,2013 - ARM Ltd
4 * Author: Marc Zyngier <[email protected]>
Marc Zyngierdcd2e402012-12-12 18:52:05 +00005 */
6
Marc Zyngier1a2fb94e2018-02-06 17:56:08 +00007#ifndef __KVM_ARM_PSCI_H__
8#define __KVM_ARM_PSCI_H__
Marc Zyngierdcd2e402012-12-12 18:52:05 +00009
Marc Zyngiera4097b32018-02-06 17:56:13 +000010#include <linux/kvm_host.h>
Marc Zyngierd0a144f2018-02-06 17:56:09 +000011#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)
Marc Zyngier58e0b222018-02-06 17:56:11 +000015#define KVM_ARM_PSCI_1_0 PSCI_VERSION(1, 0)
Will Deacon512865d2022-02-21 15:35:22 +000016#define KVM_ARM_PSCI_1_1 PSCI_VERSION(1, 1)
Marc Zyngier58e0b222018-02-06 17:56:11 +000017
Will Deacon512865d2022-02-21 15:35:22 +000018#define KVM_ARM_PSCI_LATEST KVM_ARM_PSCI_1_1
Anup Patel7d0f84a2014-04-29 11:24:16 +053019
Oliver Uptondfefa042022-02-08 01:27:05 +000020static inline int kvm_psci_version(struct kvm_vcpu *vcpu)
Marc Zyngiera4097b32018-02-06 17:56:13 +000021{
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
Marc Zyngier85bd0ba2018-01-21 16:42:56 +000026 * revisions. It is thus safe to return the latest, unless
27 * userspace has instructed us otherwise.
Marc Zyngiera4097b32018-02-06 17:56:13 +000028 */
Marc Zyngier85bd0ba2018-01-21 16:42:56 +000029 if (test_bit(KVM_ARM_VCPU_PSCI_0_2, vcpu->arch.features)) {
30 if (vcpu->kvm->arch.psci_version)
31 return vcpu->kvm->arch.psci_version;
32
Marc Zyngiera4097b32018-02-06 17:56:13 +000033 return KVM_ARM_PSCI_LATEST;
Marc Zyngier85bd0ba2018-01-21 16:42:56 +000034 }
Marc Zyngiera4097b32018-02-06 17:56:13 +000035
36 return KVM_ARM_PSCI_0_1;
37}
38
39
Christoffer Dall55009c62019-10-21 16:28:15 +010040int kvm_psci_call(struct kvm_vcpu *vcpu);
Marc Zyngierdcd2e402012-12-12 18:52:05 +000041
Marc Zyngier1a2fb94e2018-02-06 17:56:08 +000042#endif /* __KVM_ARM_PSCI_H__ */