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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 <kvm/arm_psci.h>
 26 #include <asm/cputype.h>
 27 #include <linux/uaccess.h>
 28 #include <asm/kvm.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         VCPU_STAT(hvc_exit_stat),
 37         VCPU_STAT(wfe_exit_stat),
 38         VCPU_STAT(wfi_exit_stat),
 39         VCPU_STAT(mmio_exit_user),
 40         VCPU_STAT(mmio_exit_kernel),
 41         VCPU_STAT(exits),
 42         { NULL }
 43 };
 44 
 45 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
 46 {
 47         return 0;
 48 }
 49 
 50 static u64 core_reg_offset_from_id(u64 id)
 51 {
 52         return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE);
 53 }
 54 
 55 static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 56 {
 57         u32 __user *uaddr = (u32 __user *)(long)reg->addr;
 58         struct kvm_regs *regs = &vcpu->arch.ctxt.gp_regs;
 59         u64 off;
 60 
 61         if (KVM_REG_SIZE(reg->id) != 4)
 62                 return -ENOENT;
 63 
 64         /* Our ID is an index into the kvm_regs struct. */
 65         off = core_reg_offset_from_id(reg->id);
 66         if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
 67                 return -ENOENT;
 68 
 69         return put_user(((u32 *)regs)[off], uaddr);
 70 }
 71 
 72 static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 73 {
 74         u32 __user *uaddr = (u32 __user *)(long)reg->addr;
 75         struct kvm_regs *regs = &vcpu->arch.ctxt.gp_regs;
 76         u64 off, val;
 77 
 78         if (KVM_REG_SIZE(reg->id) != 4)
 79                 return -ENOENT;
 80 
 81         /* Our ID is an index into the kvm_regs struct. */
 82         off = core_reg_offset_from_id(reg->id);
 83         if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
 84                 return -ENOENT;
 85 
 86         if (get_user(val, uaddr) != 0)
 87                 return -EFAULT;
 88 
 89         if (off == KVM_REG_ARM_CORE_REG(usr_regs.ARM_cpsr)) {
 90                 unsigned long mode = val & MODE_MASK;
 91                 switch (mode) {
 92                 case USR_MODE:
 93                 case FIQ_MODE:
 94                 case IRQ_MODE:
 95                 case SVC_MODE:
 96                 case ABT_MODE:
 97                 case UND_MODE:
 98                         break;
 99                 default:
100                         return -EINVAL;
101                 }
102         }
103 
104         ((u32 *)regs)[off] = val;
105         return 0;
106 }
107 
108 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
109 {
110         return -EINVAL;
111 }
112 
113 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
114 {
115         return -EINVAL;
116 }
117 
118 #define NUM_TIMER_REGS 3
119 
120 static bool is_timer_reg(u64 index)
121 {
122         switch (index) {
123         case KVM_REG_ARM_TIMER_CTL:
124         case KVM_REG_ARM_TIMER_CNT:
125         case KVM_REG_ARM_TIMER_CVAL:
126                 return true;
127         }
128         return false;
129 }
130 
131 static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
132 {
133         if (put_user(KVM_REG_ARM_TIMER_CTL, uindices))
134                 return -EFAULT;
135         uindices++;
136         if (put_user(KVM_REG_ARM_TIMER_CNT, uindices))
137                 return -EFAULT;
138         uindices++;
139         if (put_user(KVM_REG_ARM_TIMER_CVAL, uindices))
140                 return -EFAULT;
141 
142         return 0;
143 }
144 
145 static int set_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
146 {
147         void __user *uaddr = (void __user *)(long)reg->addr;
148         u64 val;
149         int ret;
150 
151         ret = copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id));
152         if (ret != 0)
153                 return -EFAULT;
154 
155         return kvm_arm_timer_set_reg(vcpu, reg->id, val);
156 }
157 
158 static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
159 {
160         void __user *uaddr = (void __user *)(long)reg->addr;
161         u64 val;
162 
163         val = kvm_arm_timer_get_reg(vcpu, reg->id);
164         return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)) ? -EFAULT : 0;
165 }
166 
167 static unsigned long num_core_regs(void)
168 {
169         return sizeof(struct kvm_regs) / sizeof(u32);
170 }
171 
172 /**
173  * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
174  *
175  * This is for all registers.
176  */
177 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
178 {
179         return num_core_regs() + kvm_arm_num_coproc_regs(vcpu)
180                 + kvm_arm_get_fw_num_regs(vcpu)
181                 + NUM_TIMER_REGS;
182 }
183 
184 /**
185  * kvm_arm_copy_reg_indices - get indices of all registers.
186  *
187  * We do core registers right here, then we append coproc regs.
188  */
189 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
190 {
191         unsigned int i;
192         const u64 core_reg = KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_CORE;
193         int ret;
194 
195         for (i = 0; i < sizeof(struct kvm_regs)/sizeof(u32); i++) {
196                 if (put_user(core_reg | i, uindices))
197                         return -EFAULT;
198                 uindices++;
199         }
200 
201         ret = kvm_arm_copy_fw_reg_indices(vcpu, uindices);
202         if (ret)
203                 return ret;
204         uindices += kvm_arm_get_fw_num_regs(vcpu);
205 
206         ret = copy_timer_indices(vcpu, uindices);
207         if (ret)
208                 return ret;
209         uindices += NUM_TIMER_REGS;
210 
211         return kvm_arm_copy_coproc_indices(vcpu, uindices);
212 }
213 
214 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
215 {
216         /* We currently use nothing arch-specific in upper 32 bits */
217         if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
218                 return -EINVAL;
219 
220         /* Register group 16 means we want a core register. */
221         if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
222                 return get_core_reg(vcpu, reg);
223 
224         if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_FW)
225                 return kvm_arm_get_fw_reg(vcpu, reg);
226 
227         if (is_timer_reg(reg->id))
228                 return get_timer_reg(vcpu, reg);
229 
230         return kvm_arm_coproc_get_reg(vcpu, reg);
231 }
232 
233 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
234 {
235         /* We currently use nothing arch-specific in upper 32 bits */
236         if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
237                 return -EINVAL;
238 
239         /* Register group 16 means we set a core register. */
240         if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
241                 return set_core_reg(vcpu, reg);
242 
243         if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_FW)
244                 return kvm_arm_set_fw_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 
252 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
253                                   struct kvm_sregs *sregs)
254 {
255         return -EINVAL;
256 }
257 
258 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
259                                   struct kvm_sregs *sregs)
260 {
261         return -EINVAL;
262 }
263 
264 int __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 
276 int 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 
296 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
297 {
298         return -EINVAL;
299 }
300 
301 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
302 {
303         return -EINVAL;
304 }
305 
306 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
307                                   struct kvm_translation *tr)
308 {
309         return -EINVAL;
310 }
311 
312 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
313                                         struct kvm_guest_debug *dbg)
314 {
315         return -EINVAL;
316 }
317 
318 int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
319                                struct kvm_device_attr *attr)
320 {
321         int ret;
322 
323         switch (attr->group) {
324         case KVM_ARM_VCPU_TIMER_CTRL:
325                 ret = kvm_arm_timer_set_attr(vcpu, attr);
326                 break;
327         default:
328                 ret = -ENXIO;
329                 break;
330         }
331 
332         return ret;
333 }
334 
335 int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
336                                struct kvm_device_attr *attr)
337 {
338         int ret;
339 
340         switch (attr->group) {
341         case KVM_ARM_VCPU_TIMER_CTRL:
342                 ret = kvm_arm_timer_get_attr(vcpu, attr);
343                 break;
344         default:
345                 ret = -ENXIO;
346                 break;
347         }
348 
349         return ret;
350 }
351 
352 int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
353                                struct kvm_device_attr *attr)
354 {
355         int ret;
356 
357         switch (attr->group) {
358         case KVM_ARM_VCPU_TIMER_CTRL:
359                 ret = kvm_arm_timer_has_attr(vcpu, attr);
360                 break;
361         default:
362                 ret = -ENXIO;
363                 break;
364         }
365 
366         return ret;
367 }
368 

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