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1 /*
2 * Copyright (C) 2012,2013 - ARM Ltd
3 * Author: Marc Zyngier <marc.zyngier@arm.com>
4 *
5 * Derived from arch/arm/kvm/guest.c:
6 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
7 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include <linux/errno.h>
23 #include <linux/err.h>
24 #include <linux/kvm_host.h>
25 #include <linux/module.h>
26 #include <linux/vmalloc.h>
27 #include <linux/fs.h>
28 #include <asm/cputype.h>
29 #include <asm/uaccess.h>
30 #include <asm/kvm.h>
31 #include <asm/kvm_emulate.h>
32 #include <asm/kvm_coproc.h>
33
34 #include "trace.h"
35
36 #define VM_STAT(x) { #x, offsetof(struct kvm, stat.x), KVM_STAT_VM }
37 #define VCPU_STAT(x) { #x, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU }
38
39 struct kvm_stats_debugfs_item debugfs_entries[] = {
40 VCPU_STAT(hvc_exit_stat),
41 VCPU_STAT(wfe_exit_stat),
42 VCPU_STAT(wfi_exit_stat),
43 VCPU_STAT(mmio_exit_user),
44 VCPU_STAT(mmio_exit_kernel),
45 VCPU_STAT(exits),
46 { NULL }
47 };
48
49 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
50 {
51 return 0;
52 }
53
54 static u64 core_reg_offset_from_id(u64 id)
55 {
56 return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE);
57 }
58
59 static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
60 {
61 /*
62 * Because the kvm_regs structure is a mix of 32, 64 and
63 * 128bit fields, we index it as if it was a 32bit
64 * array. Hence below, nr_regs is the number of entries, and
65 * off the index in the "array".
66 */
67 __u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr;
68 struct kvm_regs *regs = vcpu_gp_regs(vcpu);
69 int nr_regs = sizeof(*regs) / sizeof(__u32);
70 u32 off;
71
72 /* Our ID is an index into the kvm_regs struct. */
73 off = core_reg_offset_from_id(reg->id);
74 if (off >= nr_regs ||
75 (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs)
76 return -ENOENT;
77
78 if (copy_to_user(uaddr, ((u32 *)regs) + off, KVM_REG_SIZE(reg->id)))
79 return -EFAULT;
80
81 return 0;
82 }
83
84 static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
85 {
86 __u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr;
87 struct kvm_regs *regs = vcpu_gp_regs(vcpu);
88 int nr_regs = sizeof(*regs) / sizeof(__u32);
89 __uint128_t tmp;
90 void *valp = &tmp;
91 u64 off;
92 int err = 0;
93
94 /* Our ID is an index into the kvm_regs struct. */
95 off = core_reg_offset_from_id(reg->id);
96 if (off >= nr_regs ||
97 (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs)
98 return -ENOENT;
99
100 if (KVM_REG_SIZE(reg->id) > sizeof(tmp))
101 return -EINVAL;
102
103 if (copy_from_user(valp, uaddr, KVM_REG_SIZE(reg->id))) {
104 err = -EFAULT;
105 goto out;
106 }
107
108 if (off == KVM_REG_ARM_CORE_REG(regs.pstate)) {
109 u32 mode = (*(u32 *)valp) & COMPAT_PSR_MODE_MASK;
110 switch (mode) {
111 case COMPAT_PSR_MODE_USR:
112 case COMPAT_PSR_MODE_FIQ:
113 case COMPAT_PSR_MODE_IRQ:
114 case COMPAT_PSR_MODE_SVC:
115 case COMPAT_PSR_MODE_ABT:
116 case COMPAT_PSR_MODE_UND:
117 case PSR_MODE_EL0t:
118 case PSR_MODE_EL1t:
119 case PSR_MODE_EL1h:
120 break;
121 default:
122 err = -EINVAL;
123 goto out;
124 }
125 }
126
127 memcpy((u32 *)regs + off, valp, KVM_REG_SIZE(reg->id));
128 out:
129 return err;
130 }
131
132 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
133 {
134 return -EINVAL;
135 }
136
137 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
138 {
139 return -EINVAL;
140 }
141
142 static unsigned long num_core_regs(void)
143 {
144 return sizeof(struct kvm_regs) / sizeof(__u32);
145 }
146
147 /**
148 * ARM64 versions of the TIMER registers, always available on arm64
149 */
150
151 #define NUM_TIMER_REGS 3
152
153 static bool is_timer_reg(u64 index)
154 {
155 switch (index) {
156 case KVM_REG_ARM_TIMER_CTL:
157 case KVM_REG_ARM_TIMER_CNT:
158 case KVM_REG_ARM_TIMER_CVAL:
159 return true;
160 }
161 return false;
162 }
163
164 static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
165 {
166 if (put_user(KVM_REG_ARM_TIMER_CTL, uindices))
167 return -EFAULT;
168 uindices++;
169 if (put_user(KVM_REG_ARM_TIMER_CNT, uindices))
170 return -EFAULT;
171 uindices++;
172 if (put_user(KVM_REG_ARM_TIMER_CVAL, uindices))
173 return -EFAULT;
174
175 return 0;
176 }
177
178 static int set_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
179 {
180 void __user *uaddr = (void __user *)(long)reg->addr;
181 u64 val;
182 int ret;
183
184 ret = copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id));
185 if (ret != 0)
186 return -EFAULT;
187
188 return kvm_arm_timer_set_reg(vcpu, reg->id, val);
189 }
190
191 static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
192 {
193 void __user *uaddr = (void __user *)(long)reg->addr;
194 u64 val;
195
196 val = kvm_arm_timer_get_reg(vcpu, reg->id);
197 return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id));
198 }
199
200 /**
201 * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
202 *
203 * This is for all registers.
204 */
205 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
206 {
207 return num_core_regs() + kvm_arm_num_sys_reg_descs(vcpu)
208 + NUM_TIMER_REGS;
209 }
210
211 /**
212 * kvm_arm_copy_reg_indices - get indices of all registers.
213 *
214 * We do core registers right here, then we apppend system regs.
215 */
216 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
217 {
218 unsigned int i;
219 const u64 core_reg = KVM_REG_ARM64 | KVM_REG_SIZE_U64 | KVM_REG_ARM_CORE;
220 int ret;
221
222 for (i = 0; i < sizeof(struct kvm_regs) / sizeof(__u32); i++) {
223 if (put_user(core_reg | i, uindices))
224 return -EFAULT;
225 uindices++;
226 }
227
228 ret = copy_timer_indices(vcpu, uindices);
229 if (ret)
230 return ret;
231 uindices += NUM_TIMER_REGS;
232
233 return kvm_arm_copy_sys_reg_indices(vcpu, uindices);
234 }
235
236 int kvm_arm_get_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_ARM64 >> 32)
240 return -EINVAL;
241
242 /* Register group 16 means we want a core register. */
243 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
244 return get_core_reg(vcpu, reg);
245
246 if (is_timer_reg(reg->id))
247 return get_timer_reg(vcpu, reg);
248
249 return kvm_arm_sys_reg_get_reg(vcpu, reg);
250 }
251
252 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
253 {
254 /* We currently use nothing arch-specific in upper 32 bits */
255 if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
256 return -EINVAL;
257
258 /* Register group 16 means we set a core register. */
259 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
260 return set_core_reg(vcpu, reg);
261
262 if (is_timer_reg(reg->id))
263 return set_timer_reg(vcpu, reg);
264
265 return kvm_arm_sys_reg_set_reg(vcpu, reg);
266 }
267
268 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
269 struct kvm_sregs *sregs)
270 {
271 return -EINVAL;
272 }
273
274 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
275 struct kvm_sregs *sregs)
276 {
277 return -EINVAL;
278 }
279
280 int __attribute_const__ kvm_target_cpu(void)
281 {
282 unsigned long implementor = read_cpuid_implementor();
283 unsigned long part_number = read_cpuid_part_number();
284
285 switch (implementor) {
286 case ARM_CPU_IMP_ARM:
287 switch (part_number) {
288 case ARM_CPU_PART_AEM_V8:
289 return KVM_ARM_TARGET_AEM_V8;
290 case ARM_CPU_PART_FOUNDATION:
291 return KVM_ARM_TARGET_FOUNDATION_V8;
292 case ARM_CPU_PART_CORTEX_A53:
293 return KVM_ARM_TARGET_CORTEX_A53;
294 case ARM_CPU_PART_CORTEX_A57:
295 return KVM_ARM_TARGET_CORTEX_A57;
296 };
297 break;
298 case ARM_CPU_IMP_APM:
299 switch (part_number) {
300 case APM_CPU_PART_POTENZA:
301 return KVM_ARM_TARGET_XGENE_POTENZA;
302 };
303 break;
304 };
305
306 /* Return a default generic target */
307 return KVM_ARM_TARGET_GENERIC_V8;
308 }
309
310 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
311 {
312 int target = kvm_target_cpu();
313
314 if (target < 0)
315 return -ENODEV;
316
317 memset(init, 0, sizeof(*init));
318
319 /*
320 * For now, we don't return any features.
321 * In future, we might use features to return target
322 * specific features available for the preferred
323 * target type.
324 */
325 init->target = (__u32)target;
326
327 return 0;
328 }
329
330 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
331 {
332 return -EINVAL;
333 }
334
335 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
336 {
337 return -EINVAL;
338 }
339
340 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
341 struct kvm_translation *tr)
342 {
343 return -EINVAL;
344 }
345
346 #define KVM_GUESTDBG_VALID_MASK (KVM_GUESTDBG_ENABLE | \
347 KVM_GUESTDBG_USE_SW_BP | \
348 KVM_GUESTDBG_USE_HW | \
349 KVM_GUESTDBG_SINGLESTEP)
350
351 /**
352 * kvm_arch_vcpu_ioctl_set_guest_debug - set up guest debugging
353 * @kvm: pointer to the KVM struct
354 * @kvm_guest_debug: the ioctl data buffer
355 *
356 * This sets up and enables the VM for guest debugging. Userspace
357 * passes in a control flag to enable different debug types and
358 * potentially other architecture specific information in the rest of
359 * the structure.
360 */
361 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
362 struct kvm_guest_debug *dbg)
363 {
364 trace_kvm_set_guest_debug(vcpu, dbg->control);
365
366 if (dbg->control & ~KVM_GUESTDBG_VALID_MASK)
367 return -EINVAL;
368
369 if (dbg->control & KVM_GUESTDBG_ENABLE) {
370 vcpu->guest_debug = dbg->control;
371
372 /* Hardware assisted Break and Watch points */
373 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW) {
374 vcpu->arch.external_debug_state = dbg->arch;
375 }
376
377 } else {
378 /* If not enabled clear all flags */
379 vcpu->guest_debug = 0;
380 }
381 return 0;
382 }