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Linux/arch/arm/kvm/guest.c

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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         { 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 #ifndef CONFIG_KVM_ARM_TIMER
113 
114 #define NUM_TIMER_REGS 0
115 
116 static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
117 {
118         return 0;
119 }
120 
121 static bool is_timer_reg(u64 index)
122 {
123         return false;
124 }
125 
126 int kvm_arm_timer_set_reg(struct kvm_vcpu *vcpu, u64 regid, u64 value)
127 {
128         return 0;
129 }
130 
131 u64 kvm_arm_timer_get_reg(struct kvm_vcpu *vcpu, u64 regid)
132 {
133         return 0;
134 }
135 
136 #else
137 
138 #define NUM_TIMER_REGS 3
139 
140 static bool is_timer_reg(u64 index)
141 {
142         switch (index) {
143         case KVM_REG_ARM_TIMER_CTL:
144         case KVM_REG_ARM_TIMER_CNT:
145         case KVM_REG_ARM_TIMER_CVAL:
146                 return true;
147         }
148         return false;
149 }
150 
151 static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
152 {
153         if (put_user(KVM_REG_ARM_TIMER_CTL, uindices))
154                 return -EFAULT;
155         uindices++;
156         if (put_user(KVM_REG_ARM_TIMER_CNT, uindices))
157                 return -EFAULT;
158         uindices++;
159         if (put_user(KVM_REG_ARM_TIMER_CVAL, uindices))
160                 return -EFAULT;
161 
162         return 0;
163 }
164 
165 #endif
166 
167 static int set_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
168 {
169         void __user *uaddr = (void __user *)(long)reg->addr;
170         u64 val;
171         int ret;
172 
173         ret = copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id));
174         if (ret != 0)
175                 return ret;
176 
177         return kvm_arm_timer_set_reg(vcpu, reg->id, val);
178 }
179 
180 static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
181 {
182         void __user *uaddr = (void __user *)(long)reg->addr;
183         u64 val;
184 
185         val = kvm_arm_timer_get_reg(vcpu, reg->id);
186         return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id));
187 }
188 
189 static unsigned long num_core_regs(void)
190 {
191         return sizeof(struct kvm_regs) / sizeof(u32);
192 }
193 
194 /**
195  * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
196  *
197  * This is for all registers.
198  */
199 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
200 {
201         return num_core_regs() + kvm_arm_num_coproc_regs(vcpu)
202                 + NUM_TIMER_REGS;
203 }
204 
205 /**
206  * kvm_arm_copy_reg_indices - get indices of all registers.
207  *
208  * We do core registers right here, then we apppend coproc regs.
209  */
210 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
211 {
212         unsigned int i;
213         const u64 core_reg = KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_CORE;
214         int ret;
215 
216         for (i = 0; i < sizeof(struct kvm_regs)/sizeof(u32); i++) {
217                 if (put_user(core_reg | i, uindices))
218                         return -EFAULT;
219                 uindices++;
220         }
221 
222         ret = copy_timer_indices(vcpu, uindices);
223         if (ret)
224                 return ret;
225         uindices += NUM_TIMER_REGS;
226 
227         return kvm_arm_copy_coproc_indices(vcpu, uindices);
228 }
229 
230 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
231 {
232         /* We currently use nothing arch-specific in upper 32 bits */
233         if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
234                 return -EINVAL;
235 
236         /* Register group 16 means we want a core register. */
237         if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
238                 return get_core_reg(vcpu, reg);
239 
240         if (is_timer_reg(reg->id))
241                 return get_timer_reg(vcpu, reg);
242 
243         return kvm_arm_coproc_get_reg(vcpu, reg);
244 }
245 
246 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
247 {
248         /* We currently use nothing arch-specific in upper 32 bits */
249         if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
250                 return -EINVAL;
251 
252         /* Register group 16 means we set a core register. */
253         if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
254                 return set_core_reg(vcpu, reg);
255 
256         if (is_timer_reg(reg->id))
257                 return set_timer_reg(vcpu, reg);
258 
259         return kvm_arm_coproc_set_reg(vcpu, reg);
260 }
261 
262 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
263                                   struct kvm_sregs *sregs)
264 {
265         return -EINVAL;
266 }
267 
268 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
269                                   struct kvm_sregs *sregs)
270 {
271         return -EINVAL;
272 }
273 
274 int __attribute_const__ kvm_target_cpu(void)
275 {
276         unsigned long implementor = read_cpuid_implementor();
277         unsigned long part_number = read_cpuid_part_number();
278 
279         if (implementor != ARM_CPU_IMP_ARM)
280                 return -EINVAL;
281 
282         switch (part_number) {
283         case ARM_CPU_PART_CORTEX_A7:
284                 return KVM_ARM_TARGET_CORTEX_A7;
285         case ARM_CPU_PART_CORTEX_A15:
286                 return KVM_ARM_TARGET_CORTEX_A15;
287         default:
288                 return -EINVAL;
289         }
290 }
291 
292 int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
293                         const struct kvm_vcpu_init *init)
294 {
295         unsigned int i;
296 
297         /* We can only cope with guest==host and only on A15/A7 (for now). */
298         if (init->target != kvm_target_cpu())
299                 return -EINVAL;
300 
301         vcpu->arch.target = init->target;
302         bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
303 
304         /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
305         for (i = 0; i < sizeof(init->features) * 8; i++) {
306                 if (test_bit(i, (void *)init->features)) {
307                         if (i >= KVM_VCPU_MAX_FEATURES)
308                                 return -ENOENT;
309                         set_bit(i, vcpu->arch.features);
310                 }
311         }
312 
313         /* Now we know what it is, we can reset it. */
314         return kvm_reset_vcpu(vcpu);
315 }
316 
317 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
318 {
319         int target = kvm_target_cpu();
320 
321         if (target < 0)
322                 return -ENODEV;
323 
324         memset(init, 0, sizeof(*init));
325 
326         /*
327          * For now, we don't return any features.
328          * In future, we might use features to return target
329          * specific features available for the preferred
330          * target type.
331          */
332         init->target = (__u32)target;
333 
334         return 0;
335 }
336 
337 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
338 {
339         return -EINVAL;
340 }
341 
342 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
343 {
344         return -EINVAL;
345 }
346 
347 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
348                                   struct kvm_translation *tr)
349 {
350         return -EINVAL;
351 }
352 

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