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1 | /* |
2 | * Copyright (C) 2012 - Virtual Open Systems and Columbia University | |
3 | * Author: Christoffer Dall <c.dall@virtualopensystems.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, write to the Free Software | |
16 | * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
17 | */ | |
18 | ||
19 | #include <linux/errno.h> | |
20 | #include <linux/err.h> | |
21 | #include <linux/kvm_host.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/vmalloc.h> | |
24 | #include <linux/fs.h> | |
25 | #include <asm/uaccess.h> | |
26 | #include <asm/kvm.h> | |
27 | #include <asm/kvm_asm.h> | |
28 | #include <asm/kvm_emulate.h> | |
29 | ||
30 | #define VM_STAT(x) { #x, offsetof(struct kvm, stat.x), KVM_STAT_VM } | |
31 | #define VCPU_STAT(x) { #x, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU } | |
32 | ||
33 | struct kvm_stats_debugfs_item debugfs_entries[] = { | |
34 | { NULL } | |
35 | }; | |
36 | ||
37 | int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) | |
38 | { | |
39 | return 0; | |
40 | } | |
41 | ||
42 | static u64 core_reg_offset_from_id(u64 id) | |
43 | { | |
44 | return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE); | |
45 | } | |
46 | ||
47 | static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) | |
48 | { | |
49 | u32 __user *uaddr = (u32 __user *)(long)reg->addr; | |
50 | struct kvm_regs *regs = &vcpu->arch.regs; | |
51 | u64 off; | |
52 | ||
53 | if (KVM_REG_SIZE(reg->id) != 4) | |
54 | return -ENOENT; | |
55 | ||
56 | /* Our ID is an index into the kvm_regs struct. */ | |
57 | off = core_reg_offset_from_id(reg->id); | |
58 | if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id)) | |
59 | return -ENOENT; | |
60 | ||
61 | return put_user(((u32 *)regs)[off], uaddr); | |
62 | } | |
63 | ||
64 | static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) | |
65 | { | |
66 | u32 __user *uaddr = (u32 __user *)(long)reg->addr; | |
67 | struct kvm_regs *regs = &vcpu->arch.regs; | |
68 | u64 off, val; | |
69 | ||
70 | if (KVM_REG_SIZE(reg->id) != 4) | |
71 | return -ENOENT; | |
72 | ||
73 | /* Our ID is an index into the kvm_regs struct. */ | |
74 | off = core_reg_offset_from_id(reg->id); | |
75 | if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id)) | |
76 | return -ENOENT; | |
77 | ||
78 | if (get_user(val, uaddr) != 0) | |
79 | return -EFAULT; | |
80 | ||
81 | if (off == KVM_REG_ARM_CORE_REG(usr_regs.ARM_cpsr)) { | |
82 | unsigned long mode = val & MODE_MASK; | |
83 | switch (mode) { | |
84 | case USR_MODE: | |
85 | case FIQ_MODE: | |
86 | case IRQ_MODE: | |
87 | case SVC_MODE: | |
88 | case ABT_MODE: | |
89 | case UND_MODE: | |
90 | break; | |
91 | default: | |
92 | return -EINVAL; | |
93 | } | |
94 | } | |
95 | ||
96 | ((u32 *)regs)[off] = val; | |
97 | return 0; | |
98 | } | |
99 | ||
100 | int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) | |
101 | { | |
102 | return -EINVAL; | |
103 | } | |
104 | ||
105 | int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) | |
106 | { | |
107 | return -EINVAL; | |
108 | } | |
109 | ||
110 | static unsigned long num_core_regs(void) | |
111 | { | |
112 | return sizeof(struct kvm_regs) / sizeof(u32); | |
113 | } | |
114 | ||
115 | /** | |
116 | * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG | |
117 | * | |
118 | * This is for all registers. | |
119 | */ | |
120 | unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu) | |
121 | { | |
122 | return num_core_regs(); | |
123 | } | |
124 | ||
125 | /** | |
126 | * kvm_arm_copy_reg_indices - get indices of all registers. | |
127 | * | |
128 | * We do core registers right here, then we apppend coproc regs. | |
129 | */ | |
130 | int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices) | |
131 | { | |
132 | unsigned int i; | |
133 | const u64 core_reg = KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_CORE; | |
134 | ||
135 | for (i = 0; i < sizeof(struct kvm_regs)/sizeof(u32); i++) { | |
136 | if (put_user(core_reg | i, uindices)) | |
137 | return -EFAULT; | |
138 | uindices++; | |
139 | } | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
144 | int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) | |
145 | { | |
146 | /* We currently use nothing arch-specific in upper 32 bits */ | |
147 | if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32) | |
148 | return -EINVAL; | |
149 | ||
150 | /* Register group 16 means we want a core register. */ | |
151 | if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE) | |
152 | return get_core_reg(vcpu, reg); | |
153 | ||
154 | return -EINVAL; | |
155 | } | |
156 | ||
157 | int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) | |
158 | { | |
159 | /* We currently use nothing arch-specific in upper 32 bits */ | |
160 | if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32) | |
161 | return -EINVAL; | |
162 | ||
163 | /* Register group 16 means we set a core register. */ | |
164 | if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE) | |
165 | return set_core_reg(vcpu, reg); | |
166 | ||
167 | return -EINVAL; | |
168 | } | |
169 | ||
170 | int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, | |
171 | struct kvm_sregs *sregs) | |
172 | { | |
173 | return -EINVAL; | |
174 | } | |
175 | ||
176 | int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, | |
177 | struct kvm_sregs *sregs) | |
178 | { | |
179 | return -EINVAL; | |
180 | } | |
181 | ||
182 | int kvm_vcpu_set_target(struct kvm_vcpu *vcpu, | |
183 | const struct kvm_vcpu_init *init) | |
184 | { | |
185 | unsigned int i; | |
186 | ||
187 | /* We can only do a cortex A15 for now. */ | |
188 | if (init->target != kvm_target_cpu()) | |
189 | return -EINVAL; | |
190 | ||
191 | vcpu->arch.target = init->target; | |
192 | bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES); | |
193 | ||
194 | /* -ENOENT for unknown features, -EINVAL for invalid combinations. */ | |
195 | for (i = 0; i < sizeof(init->features) * 8; i++) { | |
196 | if (test_bit(i, (void *)init->features)) { | |
197 | if (i >= KVM_VCPU_MAX_FEATURES) | |
198 | return -ENOENT; | |
199 | set_bit(i, vcpu->arch.features); | |
200 | } | |
201 | } | |
202 | ||
203 | /* Now we know what it is, we can reset it. */ | |
204 | return kvm_reset_vcpu(vcpu); | |
205 | } | |
206 | ||
207 | int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) | |
208 | { | |
209 | return -EINVAL; | |
210 | } | |
211 | ||
212 | int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) | |
213 | { | |
214 | return -EINVAL; | |
215 | } | |
216 | ||
217 | int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, | |
218 | struct kvm_translation *tr) | |
219 | { | |
220 | return -EINVAL; | |
221 | } |