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 #define KVM_ARM_PSCI_1_2 PSCI_VERSION(1, 2) 18 #define KVM_ARM_PSCI_1_3 PSCI_VERSION(1, 3) 19 20 #define KVM_ARM_PSCI_LATEST KVM_ARM_PSCI_1_3 21 22 static inline int kvm_psci_version(struct kvm_vcpu *vcpu) 23 { 24 /* 25 * Our PSCI implementation stays the same across versions from 26 * v0.2 onward, only adding the few mandatory functions (such 27 * as FEATURES with 1.0) that are required by newer 28 * revisions. It is thus safe to return the latest, unless 29 * userspace has instructed us otherwise. 30 */ 31 if (vcpu_has_feature(vcpu, KVM_ARM_VCPU_PSCI_0_2)) { 32 if (vcpu->kvm->arch.psci_version) 33 return vcpu->kvm->arch.psci_version; 34 35 return KVM_ARM_PSCI_LATEST; 36 } 37 38 return KVM_ARM_PSCI_0_1; 39 } 40 41 /* Narrow the PSCI register arguments (r1 to r3) to 32 bits. */ 42 static inline void kvm_psci_narrow_to_32bit(struct kvm_vcpu *vcpu) 43 { 44 int i; 45 46 /* 47 * Zero the input registers' upper 32 bits. They will be fully 48 * zeroed on exit, so we're fine changing them in place. 49 */ 50 for (i = 1; i < 4; i++) 51 vcpu_set_reg(vcpu, i, lower_32_bits(vcpu_get_reg(vcpu, i))); 52 } 53 54 static inline bool kvm_psci_valid_affinity(struct kvm_vcpu *vcpu, 55 unsigned long affinity) 56 { 57 return !(affinity & ~MPIDR_HWID_BITMASK); 58 } 59 60 static inline unsigned long kvm_psci_affinity_mask(unsigned long affinity_level) 61 { 62 if (affinity_level <= 3) 63 return MPIDR_HWID_BITMASK & 64 ~((0x1UL << (affinity_level * MPIDR_LEVEL_BITS)) - 1); 65 66 return 0; 67 } 68 69 int kvm_psci_call(struct kvm_vcpu *vcpu); 70 71 #endif /* __KVM_ARM_PSCI_H__ */ 72