tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
35struct kvm_stats_debugfs_item debugfs_entries[] = {
36 { NULL }
37};
38
39int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
40{
41 return 0;
42}
43
44static 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
49static 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
66static 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
102int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
103{
104 return -EINVAL;
105}
106
107int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
108{
109 return -EINVAL;
110}
111
112#ifndef CONFIG_KVM_ARM_TIMER
113
114#define NUM_TIMER_REGS 0
115
116static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
117{
118 return 0;
119}
120
121static bool is_timer_reg(u64 index)
122{
123 return false;
124}
125
126#else
127
128#define NUM_TIMER_REGS 3
129
130static 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
141static 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
157static 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)
165 return -EFAULT;
166
167 return kvm_arm_timer_set_reg(vcpu, reg->id, val);
168}
169
170static 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
179static 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 */
189unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
190{
191 return num_core_regs() + kvm_arm_num_coproc_regs(vcpu)
192 + NUM_TIMER_REGS;
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 */
200int 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;
204 int ret;
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
212 ret = copy_timer_indices(vcpu, uindices);
213 if (ret)
214 return ret;
215 uindices += NUM_TIMER_REGS;
216
217 return kvm_arm_copy_coproc_indices(vcpu, uindices);
218}
219
220int 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
230 if (is_timer_reg(reg->id))
231 return get_timer_reg(vcpu, reg);
232
233 return kvm_arm_coproc_get_reg(vcpu, reg);
234}
235
236int 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);
245
246 if (is_timer_reg(reg->id))
247 return set_timer_reg(vcpu, reg);
248
249 return kvm_arm_coproc_set_reg(vcpu, reg);
250}
251
252int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
253 struct kvm_sregs *sregs)
254{
255 return -EINVAL;
256}
257
258int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
259 struct kvm_sregs *sregs)
260{
261 return -EINVAL;
262}
263
264int __attribute_const__ kvm_target_cpu(void)
265{
266 switch (read_cpuid_part()) {
267 case ARM_CPU_PART_CORTEX_A7:
268 return KVM_ARM_TARGET_CORTEX_A7;
269 case ARM_CPU_PART_CORTEX_A15:
270 return KVM_ARM_TARGET_CORTEX_A15;
271 default:
272 return -EINVAL;
273 }
274}
275
276int 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
296int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
297{
298 return -EINVAL;
299}
300
301int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
302{
303 return -EINVAL;
304}
305
306int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
307 struct kvm_translation *tr)
308{
309 return -EINVAL;
310}