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