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749cf76c CD |
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> | |
728d577d | 25 | #include <asm/cputype.h> |
749cf76c CD |
26 | #include <asm/uaccess.h> |
27 | #include <asm/kvm.h> | |
28 | #include <asm/kvm_asm.h> | |
29 | #include <asm/kvm_emulate.h> | |
1138245c | 30 | #include <asm/kvm_coproc.h> |
749cf76c CD |
31 | |
32 | #define VM_STAT(x) { #x, offsetof(struct kvm, stat.x), KVM_STAT_VM } | |
33 | #define VCPU_STAT(x) { #x, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU } | |
34 | ||
35 | struct kvm_stats_debugfs_item debugfs_entries[] = { | |
36 | { NULL } | |
37 | }; | |
38 | ||
39 | int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) | |
40 | { | |
41 | return 0; | |
42 | } | |
43 | ||
44 | static u64 core_reg_offset_from_id(u64 id) | |
45 | { | |
46 | return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE); | |
47 | } | |
48 | ||
49 | static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) | |
50 | { | |
51 | u32 __user *uaddr = (u32 __user *)(long)reg->addr; | |
52 | struct kvm_regs *regs = &vcpu->arch.regs; | |
53 | u64 off; | |
54 | ||
55 | if (KVM_REG_SIZE(reg->id) != 4) | |
56 | return -ENOENT; | |
57 | ||
58 | /* Our ID is an index into the kvm_regs struct. */ | |
59 | off = core_reg_offset_from_id(reg->id); | |
60 | if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id)) | |
61 | return -ENOENT; | |
62 | ||
63 | return put_user(((u32 *)regs)[off], uaddr); | |
64 | } | |
65 | ||
66 | static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) | |
67 | { | |
68 | u32 __user *uaddr = (u32 __user *)(long)reg->addr; | |
69 | struct kvm_regs *regs = &vcpu->arch.regs; | |
70 | u64 off, val; | |
71 | ||
72 | if (KVM_REG_SIZE(reg->id) != 4) | |
73 | return -ENOENT; | |
74 | ||
75 | /* Our ID is an index into the kvm_regs struct. */ | |
76 | off = core_reg_offset_from_id(reg->id); | |
77 | if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id)) | |
78 | return -ENOENT; | |
79 | ||
80 | if (get_user(val, uaddr) != 0) | |
81 | return -EFAULT; | |
82 | ||
83 | if (off == KVM_REG_ARM_CORE_REG(usr_regs.ARM_cpsr)) { | |
84 | unsigned long mode = val & MODE_MASK; | |
85 | switch (mode) { | |
86 | case USR_MODE: | |
87 | case FIQ_MODE: | |
88 | case IRQ_MODE: | |
89 | case SVC_MODE: | |
90 | case ABT_MODE: | |
91 | case UND_MODE: | |
92 | break; | |
93 | default: | |
94 | return -EINVAL; | |
95 | } | |
96 | } | |
97 | ||
98 | ((u32 *)regs)[off] = val; | |
99 | return 0; | |
100 | } | |
101 | ||
102 | int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) | |
103 | { | |
104 | return -EINVAL; | |
105 | } | |
106 | ||
107 | int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) | |
108 | { | |
109 | return -EINVAL; | |
110 | } | |
111 | ||
39735a3a AP |
112 | #ifndef CONFIG_KVM_ARM_TIMER |
113 | ||
114 | #define NUM_TIMER_REGS 0 | |
115 | ||
116 | static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices) | |
117 | { | |
118 | return 0; | |
119 | } | |
120 | ||
121 | static bool is_timer_reg(u64 index) | |
122 | { | |
123 | return false; | |
124 | } | |
125 | ||
39735a3a AP |
126 | #else |
127 | ||
128 | #define NUM_TIMER_REGS 3 | |
129 | ||
130 | static bool is_timer_reg(u64 index) | |
131 | { | |
132 | switch (index) { | |
133 | case KVM_REG_ARM_TIMER_CTL: | |
134 | case KVM_REG_ARM_TIMER_CNT: | |
135 | case KVM_REG_ARM_TIMER_CVAL: | |
136 | return true; | |
137 | } | |
138 | return false; | |
139 | } | |
140 | ||
141 | static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices) | |
142 | { | |
143 | if (put_user(KVM_REG_ARM_TIMER_CTL, uindices)) | |
144 | return -EFAULT; | |
145 | uindices++; | |
146 | if (put_user(KVM_REG_ARM_TIMER_CNT, uindices)) | |
147 | return -EFAULT; | |
148 | uindices++; | |
149 | if (put_user(KVM_REG_ARM_TIMER_CVAL, uindices)) | |
150 | return -EFAULT; | |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
155 | #endif | |
156 | ||
157 | static int set_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) | |
158 | { | |
159 | void __user *uaddr = (void __user *)(long)reg->addr; | |
160 | u64 val; | |
161 | int ret; | |
162 | ||
163 | ret = copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id)); | |
164 | if (ret != 0) | |
bd218bce | 165 | return -EFAULT; |
39735a3a AP |
166 | |
167 | return kvm_arm_timer_set_reg(vcpu, reg->id, val); | |
168 | } | |
169 | ||
170 | static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) | |
171 | { | |
172 | void __user *uaddr = (void __user *)(long)reg->addr; | |
173 | u64 val; | |
174 | ||
175 | val = kvm_arm_timer_get_reg(vcpu, reg->id); | |
176 | return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)); | |
177 | } | |
178 | ||
749cf76c CD |
179 | static unsigned long num_core_regs(void) |
180 | { | |
181 | return sizeof(struct kvm_regs) / sizeof(u32); | |
182 | } | |
183 | ||
184 | /** | |
185 | * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG | |
186 | * | |
187 | * This is for all registers. | |
188 | */ | |
189 | unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu) | |
190 | { | |
39735a3a AP |
191 | return num_core_regs() + kvm_arm_num_coproc_regs(vcpu) |
192 | + NUM_TIMER_REGS; | |
749cf76c CD |
193 | } |
194 | ||
195 | /** | |
196 | * kvm_arm_copy_reg_indices - get indices of all registers. | |
197 | * | |
198 | * We do core registers right here, then we apppend coproc regs. | |
199 | */ | |
200 | int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices) | |
201 | { | |
202 | unsigned int i; | |
203 | const u64 core_reg = KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_CORE; | |
39735a3a | 204 | int ret; |
749cf76c CD |
205 | |
206 | for (i = 0; i < sizeof(struct kvm_regs)/sizeof(u32); i++) { | |
207 | if (put_user(core_reg | i, uindices)) | |
208 | return -EFAULT; | |
209 | uindices++; | |
210 | } | |
211 | ||
39735a3a AP |
212 | ret = copy_timer_indices(vcpu, uindices); |
213 | if (ret) | |
214 | return ret; | |
215 | uindices += NUM_TIMER_REGS; | |
216 | ||
1138245c | 217 | return kvm_arm_copy_coproc_indices(vcpu, uindices); |
749cf76c CD |
218 | } |
219 | ||
220 | int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) | |
221 | { | |
222 | /* We currently use nothing arch-specific in upper 32 bits */ | |
223 | if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32) | |
224 | return -EINVAL; | |
225 | ||
226 | /* Register group 16 means we want a core register. */ | |
227 | if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE) | |
228 | return get_core_reg(vcpu, reg); | |
229 | ||
39735a3a AP |
230 | if (is_timer_reg(reg->id)) |
231 | return get_timer_reg(vcpu, reg); | |
232 | ||
1138245c | 233 | return kvm_arm_coproc_get_reg(vcpu, reg); |
749cf76c CD |
234 | } |
235 | ||
236 | int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) | |
237 | { | |
238 | /* We currently use nothing arch-specific in upper 32 bits */ | |
239 | if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32) | |
240 | return -EINVAL; | |
241 | ||
242 | /* Register group 16 means we set a core register. */ | |
243 | if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE) | |
244 | return set_core_reg(vcpu, reg); | |
39735a3a AP |
245 | |
246 | if (is_timer_reg(reg->id)) | |
247 | return set_timer_reg(vcpu, reg); | |
749cf76c | 248 | |
1138245c | 249 | return kvm_arm_coproc_set_reg(vcpu, reg); |
749cf76c CD |
250 | } |
251 | ||
252 | int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, | |
253 | struct kvm_sregs *sregs) | |
254 | { | |
255 | return -EINVAL; | |
256 | } | |
257 | ||
258 | int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, | |
259 | struct kvm_sregs *sregs) | |
260 | { | |
261 | return -EINVAL; | |
262 | } | |
263 | ||
728d577d MZ |
264 | int __attribute_const__ kvm_target_cpu(void) |
265 | { | |
af040ffc | 266 | switch (read_cpuid_part()) { |
e8c2d99f JA |
267 | case ARM_CPU_PART_CORTEX_A7: |
268 | return KVM_ARM_TARGET_CORTEX_A7; | |
728d577d MZ |
269 | case ARM_CPU_PART_CORTEX_A15: |
270 | return KVM_ARM_TARGET_CORTEX_A15; | |
271 | default: | |
272 | return -EINVAL; | |
273 | } | |
274 | } | |
275 | ||
4a6fee80 AP |
276 | int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init) |
277 | { | |
278 | int target = kvm_target_cpu(); | |
279 | ||
280 | if (target < 0) | |
281 | return -ENODEV; | |
282 | ||
283 | memset(init, 0, sizeof(*init)); | |
284 | ||
285 | /* | |
286 | * For now, we don't return any features. | |
287 | * In future, we might use features to return target | |
288 | * specific features available for the preferred | |
289 | * target type. | |
290 | */ | |
291 | init->target = (__u32)target; | |
292 | ||
293 | return 0; | |
294 | } | |
295 | ||
749cf76c CD |
296 | int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) |
297 | { | |
298 | return -EINVAL; | |
299 | } | |
300 | ||
301 | int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) | |
302 | { | |
303 | return -EINVAL; | |
304 | } | |
305 | ||
306 | int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, | |
307 | struct kvm_translation *tr) | |
308 | { | |
309 | return -EINVAL; | |
310 | } |