1 /* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License, version 2, as 4 * published by the Free Software Foundation. 5 * 6 * This program is distributed in the hope that it will be useful, 7 * but WITHOUT ANY WARRANTY; without even the implied warranty of 8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 9 * GNU General Public License for more details. 10 * 11 * You should have received a copy of the GNU General Public License 12 * along with this program; if not, write to the Free Software 13 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 14 * 15 * Copyright IBM Corp. 2007 16 * 17 * Authors: Hollis Blanchard <hollisb@us.ibm.com> 18 * Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> 19 */ 20 21 #include <linux/errno.h> 22 #include <linux/err.h> 23 #include <linux/kvm_host.h> 24 #include <linux/module.h> 25 #include <linux/vmalloc.h> 26 #include <linux/fs.h> 27 #include <asm/cputable.h> 28 #include <asm/uaccess.h> 29 #include <asm/kvm_ppc.h> 30 #include <asm/tlbflush.h> 31 #include "timing.h" 32 #include "../mm/mmu_decl.h" 33 34 #define CREATE_TRACE_POINTS 35 #include "trace.h" 36 37 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn) 38 { 39 return gfn; 40 } 41 42 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v) 43 { 44 return !(v->arch.msr & MSR_WE) || !!(v->arch.pending_exceptions); 45 } 46 47 48 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu) 49 { 50 enum emulation_result er; 51 int r; 52 53 er = kvmppc_emulate_instruction(run, vcpu); 54 switch (er) { 55 case EMULATE_DONE: 56 /* Future optimization: only reload non-volatiles if they were 57 * actually modified. */ 58 r = RESUME_GUEST_NV; 59 break; 60 case EMULATE_DO_MMIO: 61 run->exit_reason = KVM_EXIT_MMIO; 62 /* We must reload nonvolatiles because "update" load/store 63 * instructions modify register state. */ 64 /* Future optimization: only reload non-volatiles if they were 65 * actually modified. */ 66 r = RESUME_HOST_NV; 67 break; 68 case EMULATE_FAIL: 69 /* XXX Deliver Program interrupt to guest. */ 70 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__, 71 vcpu->arch.last_inst); 72 r = RESUME_HOST; 73 break; 74 default: 75 BUG(); 76 } 77 78 return r; 79 } 80 81 int kvm_arch_hardware_enable(void *garbage) 82 { 83 return 0; 84 } 85 86 void kvm_arch_hardware_disable(void *garbage) 87 { 88 } 89 90 int kvm_arch_hardware_setup(void) 91 { 92 return 0; 93 } 94 95 void kvm_arch_hardware_unsetup(void) 96 { 97 } 98 99 void kvm_arch_check_processor_compat(void *rtn) 100 { 101 *(int *)rtn = kvmppc_core_check_processor_compat(); 102 } 103 104 struct kvm *kvm_arch_create_vm(void) 105 { 106 struct kvm *kvm; 107 108 kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL); 109 if (!kvm) 110 return ERR_PTR(-ENOMEM); 111 112 return kvm; 113 } 114 115 static void kvmppc_free_vcpus(struct kvm *kvm) 116 { 117 unsigned int i; 118 struct kvm_vcpu *vcpu; 119 120 kvm_for_each_vcpu(i, vcpu, kvm) 121 kvm_arch_vcpu_free(vcpu); 122 123 mutex_lock(&kvm->lock); 124 for (i = 0; i < atomic_read(&kvm->online_vcpus); i++) 125 kvm->vcpus[i] = NULL; 126 127 atomic_set(&kvm->online_vcpus, 0); 128 mutex_unlock(&kvm->lock); 129 } 130 131 void kvm_arch_sync_events(struct kvm *kvm) 132 { 133 } 134 135 void kvm_arch_destroy_vm(struct kvm *kvm) 136 { 137 kvmppc_free_vcpus(kvm); 138 kvm_free_physmem(kvm); 139 kfree(kvm); 140 } 141 142 int kvm_dev_ioctl_check_extension(long ext) 143 { 144 int r; 145 146 switch (ext) { 147 case KVM_CAP_COALESCED_MMIO: 148 r = KVM_COALESCED_MMIO_PAGE_OFFSET; 149 break; 150 default: 151 r = 0; 152 break; 153 } 154 return r; 155 156 } 157 158 long kvm_arch_dev_ioctl(struct file *filp, 159 unsigned int ioctl, unsigned long arg) 160 { 161 return -EINVAL; 162 } 163 164 int kvm_arch_set_memory_region(struct kvm *kvm, 165 struct kvm_userspace_memory_region *mem, 166 struct kvm_memory_slot old, 167 int user_alloc) 168 { 169 return 0; 170 } 171 172 void kvm_arch_flush_shadow(struct kvm *kvm) 173 { 174 } 175 176 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) 177 { 178 struct kvm_vcpu *vcpu; 179 vcpu = kvmppc_core_vcpu_create(kvm, id); 180 kvmppc_create_vcpu_debugfs(vcpu, id); 181 return vcpu; 182 } 183 184 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) 185 { 186 kvmppc_remove_vcpu_debugfs(vcpu); 187 kvmppc_core_vcpu_free(vcpu); 188 } 189 190 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) 191 { 192 kvm_arch_vcpu_free(vcpu); 193 } 194 195 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) 196 { 197 return kvmppc_core_pending_dec(vcpu); 198 } 199 200 static void kvmppc_decrementer_func(unsigned long data) 201 { 202 struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data; 203 204 kvmppc_core_queue_dec(vcpu); 205 206 if (waitqueue_active(&vcpu->wq)) { 207 wake_up_interruptible(&vcpu->wq); 208 vcpu->stat.halt_wakeup++; 209 } 210 } 211 212 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) 213 { 214 setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func, 215 (unsigned long)vcpu); 216 217 return 0; 218 } 219 220 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) 221 { 222 kvmppc_mmu_destroy(vcpu); 223 } 224 225 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) 226 { 227 kvmppc_core_vcpu_load(vcpu, cpu); 228 } 229 230 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) 231 { 232 kvmppc_core_vcpu_put(vcpu); 233 } 234 235 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, 236 struct kvm_guest_debug *dbg) 237 { 238 return -EINVAL; 239 } 240 241 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu, 242 struct kvm_run *run) 243 { 244 ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr]; 245 *gpr = run->dcr.data; 246 } 247 248 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu, 249 struct kvm_run *run) 250 { 251 ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr]; 252 253 if (run->mmio.len > sizeof(*gpr)) { 254 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len); 255 return; 256 } 257 258 if (vcpu->arch.mmio_is_bigendian) { 259 switch (run->mmio.len) { 260 case 4: *gpr = *(u32 *)run->mmio.data; break; 261 case 2: *gpr = *(u16 *)run->mmio.data; break; 262 case 1: *gpr = *(u8 *)run->mmio.data; break; 263 } 264 } else { 265 /* Convert BE data from userland back to LE. */ 266 switch (run->mmio.len) { 267 case 4: *gpr = ld_le32((u32 *)run->mmio.data); break; 268 case 2: *gpr = ld_le16((u16 *)run->mmio.data); break; 269 case 1: *gpr = *(u8 *)run->mmio.data; break; 270 } 271 } 272 } 273 274 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu, 275 unsigned int rt, unsigned int bytes, int is_bigendian) 276 { 277 if (bytes > sizeof(run->mmio.data)) { 278 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__, 279 run->mmio.len); 280 } 281 282 run->mmio.phys_addr = vcpu->arch.paddr_accessed; 283 run->mmio.len = bytes; 284 run->mmio.is_write = 0; 285 286 vcpu->arch.io_gpr = rt; 287 vcpu->arch.mmio_is_bigendian = is_bigendian; 288 vcpu->mmio_needed = 1; 289 vcpu->mmio_is_write = 0; 290 291 return EMULATE_DO_MMIO; 292 } 293 294 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu, 295 u32 val, unsigned int bytes, int is_bigendian) 296 { 297 void *data = run->mmio.data; 298 299 if (bytes > sizeof(run->mmio.data)) { 300 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__, 301 run->mmio.len); 302 } 303 304 run->mmio.phys_addr = vcpu->arch.paddr_accessed; 305 run->mmio.len = bytes; 306 run->mmio.is_write = 1; 307 vcpu->mmio_needed = 1; 308 vcpu->mmio_is_write = 1; 309 310 /* Store the value at the lowest bytes in 'data'. */ 311 if (is_bigendian) { 312 switch (bytes) { 313 case 4: *(u32 *)data = val; break; 314 case 2: *(u16 *)data = val; break; 315 case 1: *(u8 *)data = val; break; 316 } 317 } else { 318 /* Store LE value into 'data'. */ 319 switch (bytes) { 320 case 4: st_le32(data, val); break; 321 case 2: st_le16(data, val); break; 322 case 1: *(u8 *)data = val; break; 323 } 324 } 325 326 return EMULATE_DO_MMIO; 327 } 328 329 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) 330 { 331 int r; 332 sigset_t sigsaved; 333 334 vcpu_load(vcpu); 335 336 if (vcpu->sigset_active) 337 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); 338 339 if (vcpu->mmio_needed) { 340 if (!vcpu->mmio_is_write) 341 kvmppc_complete_mmio_load(vcpu, run); 342 vcpu->mmio_needed = 0; 343 } else if (vcpu->arch.dcr_needed) { 344 if (!vcpu->arch.dcr_is_write) 345 kvmppc_complete_dcr_load(vcpu, run); 346 vcpu->arch.dcr_needed = 0; 347 } 348 349 kvmppc_core_deliver_interrupts(vcpu); 350 351 local_irq_disable(); 352 kvm_guest_enter(); 353 r = __kvmppc_vcpu_run(run, vcpu); 354 kvm_guest_exit(); 355 local_irq_enable(); 356 357 if (vcpu->sigset_active) 358 sigprocmask(SIG_SETMASK, &sigsaved, NULL); 359 360 vcpu_put(vcpu); 361 362 return r; 363 } 364 365 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq) 366 { 367 kvmppc_core_queue_external(vcpu, irq); 368 369 if (waitqueue_active(&vcpu->wq)) { 370 wake_up_interruptible(&vcpu->wq); 371 vcpu->stat.halt_wakeup++; 372 } 373 374 return 0; 375 } 376 377 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, 378 struct kvm_mp_state *mp_state) 379 { 380 return -EINVAL; 381 } 382 383 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, 384 struct kvm_mp_state *mp_state) 385 { 386 return -EINVAL; 387 } 388 389 long kvm_arch_vcpu_ioctl(struct file *filp, 390 unsigned int ioctl, unsigned long arg) 391 { 392 struct kvm_vcpu *vcpu = filp->private_data; 393 void __user *argp = (void __user *)arg; 394 long r; 395 396 switch (ioctl) { 397 case KVM_INTERRUPT: { 398 struct kvm_interrupt irq; 399 r = -EFAULT; 400 if (copy_from_user(&irq, argp, sizeof(irq))) 401 goto out; 402 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq); 403 break; 404 } 405 default: 406 r = -EINVAL; 407 } 408 409 out: 410 return r; 411 } 412 413 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) 414 { 415 return -ENOTSUPP; 416 } 417 418 long kvm_arch_vm_ioctl(struct file *filp, 419 unsigned int ioctl, unsigned long arg) 420 { 421 long r; 422 423 switch (ioctl) { 424 default: 425 r = -ENOTTY; 426 } 427 428 return r; 429 } 430 431 int kvm_arch_init(void *opaque) 432 { 433 return 0; 434 } 435 436 void kvm_arch_exit(void) 437 { 438 } 439