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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
4 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
5 */
6
7#include <linux/errno.h>
8#include <linux/err.h>
9#include <linux/kvm_host.h>
10#include <linux/module.h>
11#include <linux/vmalloc.h>
12#include <linux/fs.h>
13#include <kvm/arm_psci.h>
14#include <asm/cputype.h>
15#include <linux/uaccess.h>
16#include <asm/kvm.h>
17#include <asm/kvm_emulate.h>
18#include <asm/kvm_coproc.h>
19
20#define VM_STAT(x) { #x, offsetof(struct kvm, stat.x), KVM_STAT_VM }
21#define VCPU_STAT(x) { #x, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU }
22
23struct kvm_stats_debugfs_item debugfs_entries[] = {
24 VCPU_STAT(hvc_exit_stat),
25 VCPU_STAT(wfe_exit_stat),
26 VCPU_STAT(wfi_exit_stat),
27 VCPU_STAT(mmio_exit_user),
28 VCPU_STAT(mmio_exit_kernel),
29 VCPU_STAT(exits),
30 { NULL }
31};
32
33int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
34{
35 return 0;
36}
37
38static u64 core_reg_offset_from_id(u64 id)
39{
40 return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE);
41}
42
43static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
44{
45 u32 __user *uaddr = (u32 __user *)(long)reg->addr;
46 struct kvm_regs *regs = &vcpu->arch.ctxt.gp_regs;
47 u64 off;
48
49 if (KVM_REG_SIZE(reg->id) != 4)
50 return -ENOENT;
51
52 /* Our ID is an index into the kvm_regs struct. */
53 off = core_reg_offset_from_id(reg->id);
54 if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
55 return -ENOENT;
56
57 return put_user(((u32 *)regs)[off], uaddr);
58}
59
60static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
61{
62 u32 __user *uaddr = (u32 __user *)(long)reg->addr;
63 struct kvm_regs *regs = &vcpu->arch.ctxt.gp_regs;
64 u64 off, val;
65
66 if (KVM_REG_SIZE(reg->id) != 4)
67 return -ENOENT;
68
69 /* Our ID is an index into the kvm_regs struct. */
70 off = core_reg_offset_from_id(reg->id);
71 if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
72 return -ENOENT;
73
74 if (get_user(val, uaddr) != 0)
75 return -EFAULT;
76
77 if (off == KVM_REG_ARM_CORE_REG(usr_regs.ARM_cpsr)) {
78 unsigned long mode = val & MODE_MASK;
79 switch (mode) {
80 case USR_MODE:
81 case FIQ_MODE:
82 case IRQ_MODE:
83 case SVC_MODE:
84 case ABT_MODE:
85 case UND_MODE:
86 break;
87 default:
88 return -EINVAL;
89 }
90 }
91
92 ((u32 *)regs)[off] = val;
93 return 0;
94}
95
96int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
97{
98 return -EINVAL;
99}
100
101int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
102{
103 return -EINVAL;
104}
105
106#define NUM_TIMER_REGS 3
107
108static bool is_timer_reg(u64 index)
109{
110 switch (index) {
111 case KVM_REG_ARM_TIMER_CTL:
112 case KVM_REG_ARM_TIMER_CNT:
113 case KVM_REG_ARM_TIMER_CVAL:
114 return true;
115 }
116 return false;
117}
118
119static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
120{
121 if (put_user(KVM_REG_ARM_TIMER_CTL, uindices))
122 return -EFAULT;
123 uindices++;
124 if (put_user(KVM_REG_ARM_TIMER_CNT, uindices))
125 return -EFAULT;
126 uindices++;
127 if (put_user(KVM_REG_ARM_TIMER_CVAL, uindices))
128 return -EFAULT;
129
130 return 0;
131}
132
133static int set_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
134{
135 void __user *uaddr = (void __user *)(long)reg->addr;
136 u64 val;
137 int ret;
138
139 ret = copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id));
140 if (ret != 0)
141 return -EFAULT;
142
143 return kvm_arm_timer_set_reg(vcpu, reg->id, val);
144}
145
146static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
147{
148 void __user *uaddr = (void __user *)(long)reg->addr;
149 u64 val;
150
151 val = kvm_arm_timer_get_reg(vcpu, reg->id);
152 return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)) ? -EFAULT : 0;
153}
154
155static unsigned long num_core_regs(void)
156{
157 return sizeof(struct kvm_regs) / sizeof(u32);
158}
159
160/**
161 * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
162 *
163 * This is for all registers.
164 */
165unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
166{
167 return num_core_regs() + kvm_arm_num_coproc_regs(vcpu)
168 + kvm_arm_get_fw_num_regs(vcpu)
169 + NUM_TIMER_REGS;
170}
171
172/**
173 * kvm_arm_copy_reg_indices - get indices of all registers.
174 *
175 * We do core registers right here, then we append coproc regs.
176 */
177int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
178{
179 unsigned int i;
180 const u64 core_reg = KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_CORE;
181 int ret;
182
183 for (i = 0; i < sizeof(struct kvm_regs)/sizeof(u32); i++) {
184 if (put_user(core_reg | i, uindices))
185 return -EFAULT;
186 uindices++;
187 }
188
189 ret = kvm_arm_copy_fw_reg_indices(vcpu, uindices);
190 if (ret)
191 return ret;
192 uindices += kvm_arm_get_fw_num_regs(vcpu);
193
194 ret = copy_timer_indices(vcpu, uindices);
195 if (ret)
196 return ret;
197 uindices += NUM_TIMER_REGS;
198
199 return kvm_arm_copy_coproc_indices(vcpu, uindices);
200}
201
202int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
203{
204 /* We currently use nothing arch-specific in upper 32 bits */
205 if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
206 return -EINVAL;
207
208 /* Register group 16 means we want a core register. */
209 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
210 return get_core_reg(vcpu, reg);
211
212 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_FW)
213 return kvm_arm_get_fw_reg(vcpu, reg);
214
215 if (is_timer_reg(reg->id))
216 return get_timer_reg(vcpu, reg);
217
218 return kvm_arm_coproc_get_reg(vcpu, reg);
219}
220
221int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
222{
223 /* We currently use nothing arch-specific in upper 32 bits */
224 if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
225 return -EINVAL;
226
227 /* Register group 16 means we set a core register. */
228 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
229 return set_core_reg(vcpu, reg);
230
231 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_FW)
232 return kvm_arm_set_fw_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
240int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
241 struct kvm_sregs *sregs)
242{
243 return -EINVAL;
244}
245
246int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
247 struct kvm_sregs *sregs)
248{
249 return -EINVAL;
250}
251
252
253int __kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
254 struct kvm_vcpu_events *events)
255{
256 events->exception.serror_pending = !!(*vcpu_hcr(vcpu) & HCR_VA);
257
258 return 0;
259}
260
261int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
262 struct kvm_vcpu_events *events)
263{
264 bool serror_pending = events->exception.serror_pending;
265 bool has_esr = events->exception.serror_has_esr;
266
267 if (serror_pending && has_esr)
268 return -EINVAL;
269 else if (serror_pending)
270 kvm_inject_vabt(vcpu);
271
272 return 0;
273}
274
275int __attribute_const__ kvm_target_cpu(void)
276{
277 switch (read_cpuid_part()) {
278 case ARM_CPU_PART_CORTEX_A7:
279 return KVM_ARM_TARGET_CORTEX_A7;
280 case ARM_CPU_PART_CORTEX_A15:
281 return KVM_ARM_TARGET_CORTEX_A15;
282 default:
283 return -EINVAL;
284 }
285}
286
287int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
288{
289 int target = kvm_target_cpu();
290
291 if (target < 0)
292 return -ENODEV;
293
294 memset(init, 0, sizeof(*init));
295
296 /*
297 * For now, we don't return any features.
298 * In future, we might use features to return target
299 * specific features available for the preferred
300 * target type.
301 */
302 init->target = (__u32)target;
303
304 return 0;
305}
306
307int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
308{
309 return -EINVAL;
310}
311
312int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
313{
314 return -EINVAL;
315}
316
317int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
318 struct kvm_translation *tr)
319{
320 return -EINVAL;
321}
322
323int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
324 struct kvm_guest_debug *dbg)
325{
326 return -EINVAL;
327}
328
329int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
330 struct kvm_device_attr *attr)
331{
332 int ret;
333
334 switch (attr->group) {
335 case KVM_ARM_VCPU_TIMER_CTRL:
336 ret = kvm_arm_timer_set_attr(vcpu, attr);
337 break;
338 default:
339 ret = -ENXIO;
340 break;
341 }
342
343 return ret;
344}
345
346int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
347 struct kvm_device_attr *attr)
348{
349 int ret;
350
351 switch (attr->group) {
352 case KVM_ARM_VCPU_TIMER_CTRL:
353 ret = kvm_arm_timer_get_attr(vcpu, attr);
354 break;
355 default:
356 ret = -ENXIO;
357 break;
358 }
359
360 return ret;
361}
362
363int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
364 struct kvm_device_attr *attr)
365{
366 int ret;
367
368 switch (attr->group) {
369 case KVM_ARM_VCPU_TIMER_CTRL:
370 ret = kvm_arm_timer_has_attr(vcpu, attr);
371 break;
372 default:
373 ret = -ENXIO;
374 break;
375 }
376
377 return ret;
378}