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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_emulate.h>
 29 #include <asm/kvm_coproc.h>
 30 
 31 #define VM_STAT(x) { #x, offsetof(struct kvm, stat.x), KVM_STAT_VM }
 32 #define VCPU_STAT(x) { #x, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU }
 33 
 34 struct kvm_stats_debugfs_item debugfs_entries[] = {
 35         VCPU_STAT(hvc_exit_stat),
 36         VCPU_STAT(wfe_exit_stat),
 37         VCPU_STAT(wfi_exit_stat),
 38         VCPU_STAT(mmio_exit_user),
 39         VCPU_STAT(mmio_exit_kernel),
 40         VCPU_STAT(exits),
 41         { NULL }
 42 };
 43 
 44 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
 45 {
 46         return 0;
 47 }
 48 
 49 static u64 core_reg_offset_from_id(u64 id)
 50 {
 51         return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE);
 52 }
 53 
 54 static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 55 {
 56         u32 __user *uaddr = (u32 __user *)(long)reg->addr;
 57         struct kvm_regs *regs = &vcpu->arch.ctxt.gp_regs;
 58         u64 off;
 59 
 60         if (KVM_REG_SIZE(reg->id) != 4)
 61                 return -ENOENT;
 62 
 63         /* Our ID is an index into the kvm_regs struct. */
 64         off = core_reg_offset_from_id(reg->id);
 65         if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
 66                 return -ENOENT;
 67 
 68         return put_user(((u32 *)regs)[off], uaddr);
 69 }
 70 
 71 static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 72 {
 73         u32 __user *uaddr = (u32 __user *)(long)reg->addr;
 74         struct kvm_regs *regs = &vcpu->arch.ctxt.gp_regs;
 75         u64 off, val;
 76 
 77         if (KVM_REG_SIZE(reg->id) != 4)
 78                 return -ENOENT;
 79 
 80         /* Our ID is an index into the kvm_regs struct. */
 81         off = core_reg_offset_from_id(reg->id);
 82         if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
 83                 return -ENOENT;
 84 
 85         if (get_user(val, uaddr) != 0)
 86                 return -EFAULT;
 87 
 88         if (off == KVM_REG_ARM_CORE_REG(usr_regs.ARM_cpsr)) {
 89                 unsigned long mode = val & MODE_MASK;
 90                 switch (mode) {
 91                 case USR_MODE:
 92                 case FIQ_MODE:
 93                 case IRQ_MODE:
 94                 case SVC_MODE:
 95                 case ABT_MODE:
 96                 case UND_MODE:
 97                         break;
 98                 default:
 99                         return -EINVAL;
100                 }
101         }
102 
103         ((u32 *)regs)[off] = val;
104         return 0;
105 }
106 
107 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
108 {
109         return -EINVAL;
110 }
111 
112 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
113 {
114         return -EINVAL;
115 }
116 
117 #define NUM_TIMER_REGS 3
118 
119 static bool is_timer_reg(u64 index)
120 {
121         switch (index) {
122         case KVM_REG_ARM_TIMER_CTL:
123         case KVM_REG_ARM_TIMER_CNT:
124         case KVM_REG_ARM_TIMER_CVAL:
125                 return true;
126         }
127         return false;
128 }
129 
130 static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
131 {
132         if (put_user(KVM_REG_ARM_TIMER_CTL, uindices))
133                 return -EFAULT;
134         uindices++;
135         if (put_user(KVM_REG_ARM_TIMER_CNT, uindices))
136                 return -EFAULT;
137         uindices++;
138         if (put_user(KVM_REG_ARM_TIMER_CVAL, uindices))
139                 return -EFAULT;
140 
141         return 0;
142 }
143 
144 static int set_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
145 {
146         void __user *uaddr = (void __user *)(long)reg->addr;
147         u64 val;
148         int ret;
149 
150         ret = copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id));
151         if (ret != 0)
152                 return -EFAULT;
153 
154         return kvm_arm_timer_set_reg(vcpu, reg->id, val);
155 }
156 
157 static int get_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 
162         val = kvm_arm_timer_get_reg(vcpu, reg->id);
163         return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)) ? -EFAULT : 0;
164 }
165 
166 static unsigned long num_core_regs(void)
167 {
168         return sizeof(struct kvm_regs) / sizeof(u32);
169 }
170 
171 /**
172  * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
173  *
174  * This is for all registers.
175  */
176 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
177 {
178         return num_core_regs() + kvm_arm_num_coproc_regs(vcpu)
179                 + NUM_TIMER_REGS;
180 }
181 
182 /**
183  * kvm_arm_copy_reg_indices - get indices of all registers.
184  *
185  * We do core registers right here, then we append coproc regs.
186  */
187 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
188 {
189         unsigned int i;
190         const u64 core_reg = KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_CORE;
191         int ret;
192 
193         for (i = 0; i < sizeof(struct kvm_regs)/sizeof(u32); i++) {
194                 if (put_user(core_reg | i, uindices))
195                         return -EFAULT;
196                 uindices++;
197         }
198 
199         ret = copy_timer_indices(vcpu, uindices);
200         if (ret)
201                 return ret;
202         uindices += NUM_TIMER_REGS;
203 
204         return kvm_arm_copy_coproc_indices(vcpu, uindices);
205 }
206 
207 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
208 {
209         /* We currently use nothing arch-specific in upper 32 bits */
210         if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
211                 return -EINVAL;
212 
213         /* Register group 16 means we want a core register. */
214         if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
215                 return get_core_reg(vcpu, reg);
216 
217         if (is_timer_reg(reg->id))
218                 return get_timer_reg(vcpu, reg);
219 
220         return kvm_arm_coproc_get_reg(vcpu, reg);
221 }
222 
223 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
224 {
225         /* We currently use nothing arch-specific in upper 32 bits */
226         if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
227                 return -EINVAL;
228 
229         /* Register group 16 means we set a core register. */
230         if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
231                 return set_core_reg(vcpu, reg);
232 
233         if (is_timer_reg(reg->id))
234                 return set_timer_reg(vcpu, reg);
235 
236         return kvm_arm_coproc_set_reg(vcpu, reg);
237 }
238 
239 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
240                                   struct kvm_sregs *sregs)
241 {
242         return -EINVAL;
243 }
244 
245 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
246                                   struct kvm_sregs *sregs)
247 {
248         return -EINVAL;
249 }
250 
251 int __attribute_const__ kvm_target_cpu(void)
252 {
253         switch (read_cpuid_part()) {
254         case ARM_CPU_PART_CORTEX_A7:
255                 return KVM_ARM_TARGET_CORTEX_A7;
256         case ARM_CPU_PART_CORTEX_A15:
257                 return KVM_ARM_TARGET_CORTEX_A15;
258         default:
259                 return -EINVAL;
260         }
261 }
262 
263 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
264 {
265         int target = kvm_target_cpu();
266 
267         if (target < 0)
268                 return -ENODEV;
269 
270         memset(init, 0, sizeof(*init));
271 
272         /*
273          * For now, we don't return any features.
274          * In future, we might use features to return target
275          * specific features available for the preferred
276          * target type.
277          */
278         init->target = (__u32)target;
279 
280         return 0;
281 }
282 
283 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
284 {
285         return -EINVAL;
286 }
287 
288 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
289 {
290         return -EINVAL;
291 }
292 
293 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
294                                   struct kvm_translation *tr)
295 {
296         return -EINVAL;
297 }
298 
299 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
300                                         struct kvm_guest_debug *dbg)
301 {
302         return -EINVAL;
303 }
304 

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