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 
kvm_psci_version(struct kvm_vcpu * vcpu)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 (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 
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