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aa024c2f MZ |
1 | /* |
2 | * Copyright (C) 2012 - ARM Ltd | |
3 | * Author: Marc Zyngier <marc.zyngier@arm.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
18 | #include <linux/kvm_host.h> | |
19 | #include <linux/wait.h> | |
20 | ||
79c64880 | 21 | #include <asm/cputype.h> |
aa024c2f MZ |
22 | #include <asm/kvm_emulate.h> |
23 | #include <asm/kvm_psci.h> | |
24 | ||
25 | /* | |
26 | * This is an implementation of the Power State Coordination Interface | |
27 | * as described in ARM document number ARM DEN 0022A. | |
28 | */ | |
29 | ||
30 | static void kvm_psci_vcpu_off(struct kvm_vcpu *vcpu) | |
31 | { | |
32 | vcpu->arch.pause = true; | |
33 | } | |
34 | ||
35 | static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu) | |
36 | { | |
37 | struct kvm *kvm = source_vcpu->kvm; | |
79c64880 | 38 | struct kvm_vcpu *vcpu = NULL, *tmp; |
aa024c2f MZ |
39 | wait_queue_head_t *wq; |
40 | unsigned long cpu_id; | |
79c64880 | 41 | unsigned long mpidr; |
aa024c2f | 42 | phys_addr_t target_pc; |
79c64880 | 43 | int i; |
aa024c2f MZ |
44 | |
45 | cpu_id = *vcpu_reg(source_vcpu, 1); | |
46 | if (vcpu_mode_is_32bit(source_vcpu)) | |
47 | cpu_id &= ~((u32) 0); | |
48 | ||
79c64880 MZ |
49 | kvm_for_each_vcpu(i, tmp, kvm) { |
50 | mpidr = kvm_vcpu_get_mpidr(tmp); | |
51 | if ((mpidr & MPIDR_HWID_BITMASK) == (cpu_id & MPIDR_HWID_BITMASK)) { | |
52 | vcpu = tmp; | |
53 | break; | |
54 | } | |
55 | } | |
56 | ||
478a8237 CD |
57 | /* |
58 | * Make sure the caller requested a valid CPU and that the CPU is | |
59 | * turned off. | |
60 | */ | |
61 | if (!vcpu || !vcpu->arch.pause) | |
aa024c2f MZ |
62 | return KVM_PSCI_RET_INVAL; |
63 | ||
64 | target_pc = *vcpu_reg(source_vcpu, 2); | |
65 | ||
aa024c2f MZ |
66 | kvm_reset_vcpu(vcpu); |
67 | ||
68 | /* Gracefully handle Thumb2 entry point */ | |
69 | if (vcpu_mode_is_32bit(vcpu) && (target_pc & 1)) { | |
70 | target_pc &= ~((phys_addr_t) 1); | |
71 | vcpu_set_thumb(vcpu); | |
72 | } | |
73 | ||
ce94fe93 MZ |
74 | /* Propagate caller endianness */ |
75 | if (kvm_vcpu_is_be(source_vcpu)) | |
76 | kvm_vcpu_set_be(vcpu); | |
77 | ||
aa024c2f MZ |
78 | *vcpu_pc(vcpu) = target_pc; |
79 | vcpu->arch.pause = false; | |
80 | smp_mb(); /* Make sure the above is visible */ | |
81 | ||
478a8237 | 82 | wq = kvm_arch_vcpu_wq(vcpu); |
aa024c2f MZ |
83 | wake_up_interruptible(wq); |
84 | ||
85 | return KVM_PSCI_RET_SUCCESS; | |
86 | } | |
87 | ||
88 | /** | |
89 | * kvm_psci_call - handle PSCI call if r0 value is in range | |
90 | * @vcpu: Pointer to the VCPU struct | |
91 | * | |
24a7f675 | 92 | * Handle PSCI calls from guests through traps from HVC instructions. |
aa024c2f MZ |
93 | * The calling convention is similar to SMC calls to the secure world where |
94 | * the function number is placed in r0 and this function returns true if the | |
95 | * function number specified in r0 is withing the PSCI range, and false | |
96 | * otherwise. | |
97 | */ | |
98 | bool kvm_psci_call(struct kvm_vcpu *vcpu) | |
99 | { | |
100 | unsigned long psci_fn = *vcpu_reg(vcpu, 0) & ~((u32) 0); | |
101 | unsigned long val; | |
102 | ||
103 | switch (psci_fn) { | |
104 | case KVM_PSCI_FN_CPU_OFF: | |
105 | kvm_psci_vcpu_off(vcpu); | |
106 | val = KVM_PSCI_RET_SUCCESS; | |
107 | break; | |
108 | case KVM_PSCI_FN_CPU_ON: | |
109 | val = kvm_psci_vcpu_on(vcpu); | |
110 | break; | |
111 | case KVM_PSCI_FN_CPU_SUSPEND: | |
112 | case KVM_PSCI_FN_MIGRATE: | |
113 | val = KVM_PSCI_RET_NI; | |
114 | break; | |
115 | ||
116 | default: | |
117 | return false; | |
118 | } | |
119 | ||
120 | *vcpu_reg(vcpu, 0) = val; | |
121 | return true; | |
122 | } |