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 /* Narrow the PSCI register arguments (r1 to r3) to 32 bits. */
kvm_psci_narrow_to_32bit(struct kvm_vcpu * vcpu)40 static inline void kvm_psci_narrow_to_32bit(struct kvm_vcpu *vcpu)
41 {
42 int i;
43
44 /*
45 * Zero the input registers' upper 32 bits. They will be fully
46 * zeroed on exit, so we're fine changing them in place.
47 */
48 for (i = 1; i < 4; i++)
49 vcpu_set_reg(vcpu, i, lower_32_bits(vcpu_get_reg(vcpu, i)));
50 }
51
kvm_psci_valid_affinity(struct kvm_vcpu * vcpu,unsigned long affinity)52 static inline bool kvm_psci_valid_affinity(struct kvm_vcpu *vcpu,
53 unsigned long affinity)
54 {
55 return !(affinity & ~MPIDR_HWID_BITMASK);
56 }
57
58
59 #define AFFINITY_MASK(level) ~((0x1UL << ((level) * MPIDR_LEVEL_BITS)) - 1)
60
psci_affinity_mask(unsigned long affinity_level)61 static inline unsigned long psci_affinity_mask(unsigned long affinity_level)
62 {
63 if (affinity_level <= 3)
64 return MPIDR_HWID_BITMASK & AFFINITY_MASK(affinity_level);
65
66 return 0;
67 }
68
69 int kvm_psci_call(struct kvm_vcpu *vcpu);
70
71 #endif /* __KVM_ARM_PSCI_H__ */
72