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
20static 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
40int kvm_psci_call(struct kvm_vcpu *vcpu);
41
42#endif /* __KVM_ARM_PSCI_H__ */
43