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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 | ||
112 | static unsigned long num_core_regs(void) | |
113 | { | |
114 | return sizeof(struct kvm_regs) / sizeof(u32); | |
115 | } | |
116 | ||
117 | /** | |
118 | * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG | |
119 | * | |
120 | * This is for all registers. | |
121 | */ | |
122 | unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu) | |
123 | { | |
1138245c | 124 | return num_core_regs() + kvm_arm_num_coproc_regs(vcpu); |
749cf76c CD |
125 | } |
126 | ||
127 | /** | |
128 | * kvm_arm_copy_reg_indices - get indices of all registers. | |
129 | * | |
130 | * We do core registers right here, then we apppend coproc regs. | |
131 | */ | |
132 | int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices) | |
133 | { | |
134 | unsigned int i; | |
135 | const u64 core_reg = KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_CORE; | |
136 | ||
137 | for (i = 0; i < sizeof(struct kvm_regs)/sizeof(u32); i++) { | |
138 | if (put_user(core_reg | i, uindices)) | |
139 | return -EFAULT; | |
140 | uindices++; | |
141 | } | |
142 | ||
1138245c | 143 | return kvm_arm_copy_coproc_indices(vcpu, uindices); |
749cf76c CD |
144 | } |
145 | ||
146 | int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) | |
147 | { | |
148 | /* We currently use nothing arch-specific in upper 32 bits */ | |
149 | if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32) | |
150 | return -EINVAL; | |
151 | ||
152 | /* Register group 16 means we want a core register. */ | |
153 | if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE) | |
154 | return get_core_reg(vcpu, reg); | |
155 | ||
1138245c | 156 | return kvm_arm_coproc_get_reg(vcpu, reg); |
749cf76c CD |
157 | } |
158 | ||
159 | int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) | |
160 | { | |
161 | /* We currently use nothing arch-specific in upper 32 bits */ | |
162 | if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32) | |
163 | return -EINVAL; | |
164 | ||
165 | /* Register group 16 means we set a core register. */ | |
166 | if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE) | |
167 | return set_core_reg(vcpu, reg); | |
168 | ||
1138245c | 169 | return kvm_arm_coproc_set_reg(vcpu, reg); |
749cf76c CD |
170 | } |
171 | ||
172 | int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, | |
173 | struct kvm_sregs *sregs) | |
174 | { | |
175 | return -EINVAL; | |
176 | } | |
177 | ||
178 | int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, | |
179 | struct kvm_sregs *sregs) | |
180 | { | |
181 | return -EINVAL; | |
182 | } | |
183 | ||
728d577d MZ |
184 | int __attribute_const__ kvm_target_cpu(void) |
185 | { | |
186 | unsigned long implementor = read_cpuid_implementor(); | |
187 | unsigned long part_number = read_cpuid_part_number(); | |
188 | ||
189 | if (implementor != ARM_CPU_IMP_ARM) | |
190 | return -EINVAL; | |
191 | ||
192 | switch (part_number) { | |
193 | case ARM_CPU_PART_CORTEX_A15: | |
194 | return KVM_ARM_TARGET_CORTEX_A15; | |
195 | default: | |
196 | return -EINVAL; | |
197 | } | |
198 | } | |
199 | ||
749cf76c CD |
200 | int kvm_vcpu_set_target(struct kvm_vcpu *vcpu, |
201 | const struct kvm_vcpu_init *init) | |
202 | { | |
203 | unsigned int i; | |
204 | ||
205 | /* We can only do a cortex A15 for now. */ | |
206 | if (init->target != kvm_target_cpu()) | |
207 | return -EINVAL; | |
208 | ||
209 | vcpu->arch.target = init->target; | |
210 | bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES); | |
211 | ||
212 | /* -ENOENT for unknown features, -EINVAL for invalid combinations. */ | |
213 | for (i = 0; i < sizeof(init->features) * 8; i++) { | |
214 | if (test_bit(i, (void *)init->features)) { | |
215 | if (i >= KVM_VCPU_MAX_FEATURES) | |
216 | return -ENOENT; | |
217 | set_bit(i, vcpu->arch.features); | |
218 | } | |
219 | } | |
220 | ||
221 | /* Now we know what it is, we can reset it. */ | |
222 | return kvm_reset_vcpu(vcpu); | |
223 | } | |
224 | ||
225 | int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) | |
226 | { | |
227 | return -EINVAL; | |
228 | } | |
229 | ||
230 | int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) | |
231 | { | |
232 | return -EINVAL; | |
233 | } | |
234 | ||
235 | int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, | |
236 | struct kvm_translation *tr) | |
237 | { | |
238 | return -EINVAL; | |
239 | } |