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 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn) 35 { 36 return gfn; 37 } 38 39 int kvm_cpu_has_interrupt(struct kvm_vcpu *v) 40 { 41 return !!(v->arch.pending_exceptions); 42 } 43 44 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v) 45 { 46 return !(v->arch.msr & MSR_WE); 47 } 48 49 50 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu) 51 { 52 enum emulation_result er; 53 int r; 54 55 er = kvmppc_emulate_instruction(run, vcpu); 56 switch (er) { 57 case EMULATE_DONE: 58 /* Future optimization: only reload non-volatiles if they were 59 * actually modified. */ 60 r = RESUME_GUEST_NV; 61 break; 62 case EMULATE_DO_MMIO: 63 run->exit_reason = KVM_EXIT_MMIO; 64 /* We must reload nonvolatiles because "update" load/store 65 * instructions modify register state. */ 66 /* Future optimization: only reload non-volatiles if they were 67 * actually modified. */ 68 r = RESUME_HOST_NV; 69 break; 70 case EMULATE_FAIL: 71 /* XXX Deliver Program interrupt to guest. */ 72 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__, 73 vcpu->arch.last_inst); 74 r = RESUME_HOST; 75 break; 76 default: 77 BUG(); 78 } 79 80 return r; 81 } 82 83 void kvm_arch_hardware_enable(void *garbage) 84 { 85 } 86 87 void kvm_arch_hardware_disable(void *garbage) 88 { 89 } 90 91 int kvm_arch_hardware_setup(void) 92 { 93 return 0; 94 } 95 96 void kvm_arch_hardware_unsetup(void) 97 { 98 } 99 100 void kvm_arch_check_processor_compat(void *rtn) 101 { 102 *(int *)rtn = kvmppc_core_check_processor_compat(); 103 } 104 105 struct kvm *kvm_arch_create_vm(void) 106 { 107 struct kvm *kvm; 108 109 kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL); 110 if (!kvm) 111 return ERR_PTR(-ENOMEM); 112 113 return kvm; 114 } 115 116 static void kvmppc_free_vcpus(struct kvm *kvm) 117 { 118 unsigned int i; 119 120 for (i = 0; i < KVM_MAX_VCPUS; ++i) { 121 if (kvm->vcpus[i]) { 122 kvm_arch_vcpu_free(kvm->vcpus[i]); 123 kvm->vcpus[i] = NULL; 124 } 125 } 126 } 127 128 void kvm_arch_destroy_vm(struct kvm *kvm) 129 { 130 kvmppc_free_vcpus(kvm); 131 kvm_free_physmem(kvm); 132 kfree(kvm); 133 } 134 135 int kvm_dev_ioctl_check_extension(long ext) 136 { 137 int r; 138 139 switch (ext) { 140 case KVM_CAP_COALESCED_MMIO: 141 r = KVM_COALESCED_MMIO_PAGE_OFFSET; 142 break; 143 default: 144 r = 0; 145 break; 146 } 147 return r; 148 149 } 150 151 long kvm_arch_dev_ioctl(struct file *filp, 152 unsigned int ioctl, unsigned long arg) 153 { 154 return -EINVAL; 155 } 156 157 int kvm_arch_set_memory_region(struct kvm *kvm, 158 struct kvm_userspace_memory_region *mem, 159 struct kvm_memory_slot old, 160 int user_alloc) 161 { 162 return 0; 163 } 164 165 void kvm_arch_flush_shadow(struct kvm *kvm) 166 { 167 } 168 169 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) 170 { 171 struct kvm_vcpu *vcpu; 172 vcpu = kvmppc_core_vcpu_create(kvm, id); 173 kvmppc_create_vcpu_debugfs(vcpu, id); 174 return vcpu; 175 } 176 177 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) 178 { 179 kvmppc_remove_vcpu_debugfs(vcpu); 180 kvmppc_core_vcpu_free(vcpu); 181 } 182 183 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) 184 { 185 kvm_arch_vcpu_free(vcpu); 186 } 187 188 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) 189 { 190 return kvmppc_core_pending_dec(vcpu); 191 } 192 193 static void kvmppc_decrementer_func(unsigned long data) 194 { 195 struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data; 196 197 kvmppc_core_queue_dec(vcpu); 198 199 if (waitqueue_active(&vcpu->wq)) { 200 wake_up_interruptible(&vcpu->wq); 201 vcpu->stat.halt_wakeup++; 202 } 203 } 204 205 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) 206 { 207 setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func, 208 (unsigned long)vcpu); 209 210 return 0; 211 } 212 213 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) 214 { 215 kvmppc_core_destroy_mmu(vcpu); 216 } 217 218 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) 219 { 220 if (vcpu->guest_debug.enabled) 221 kvmppc_core_load_guest_debugstate(vcpu); 222 223 kvmppc_core_vcpu_load(vcpu, cpu); 224 } 225 226 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) 227 { 228 if (vcpu->guest_debug.enabled) 229 kvmppc_core_load_host_debugstate(vcpu); 230 231 /* Don't leave guest TLB entries resident when being de-scheduled. */ 232 /* XXX It would be nice to differentiate between heavyweight exit and 233 * sched_out here, since we could avoid the TLB flush for heavyweight 234 * exits. */ 235 _tlbil_all(); 236 kvmppc_core_vcpu_put(vcpu); 237 } 238 239 int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu, 240 struct kvm_debug_guest *dbg) 241 { 242 int i; 243 244 vcpu->guest_debug.enabled = dbg->enabled; 245 if (vcpu->guest_debug.enabled) { 246 for (i=0; i < ARRAY_SIZE(vcpu->guest_debug.bp); i++) { 247 if (dbg->breakpoints[i].enabled) 248 vcpu->guest_debug.bp[i] = dbg->breakpoints[i].address; 249 else 250 vcpu->guest_debug.bp[i] = 0; 251 } 252 } 253 254 return 0; 255 } 256 257 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu, 258 struct kvm_run *run) 259 { 260 ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr]; 261 *gpr = run->dcr.data; 262 } 263 264 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu, 265 struct kvm_run *run) 266 { 267 ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr]; 268 269 if (run->mmio.len > sizeof(*gpr)) { 270 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len); 271 return; 272 } 273 274 if (vcpu->arch.mmio_is_bigendian) { 275 switch (run->mmio.len) { 276 case 4: *gpr = *(u32 *)run->mmio.data; break; 277 case 2: *gpr = *(u16 *)run->mmio.data; break; 278 case 1: *gpr = *(u8 *)run->mmio.data; break; 279 } 280 } else { 281 /* Convert BE data from userland back to LE. */ 282 switch (run->mmio.len) { 283 case 4: *gpr = ld_le32((u32 *)run->mmio.data); break; 284 case 2: *gpr = ld_le16((u16 *)run->mmio.data); break; 285 case 1: *gpr = *(u8 *)run->mmio.data; break; 286 } 287 } 288 } 289 290 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu, 291 unsigned int rt, unsigned int bytes, int is_bigendian) 292 { 293 if (bytes > sizeof(run->mmio.data)) { 294 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__, 295 run->mmio.len); 296 } 297 298 run->mmio.phys_addr = vcpu->arch.paddr_accessed; 299 run->mmio.len = bytes; 300 run->mmio.is_write = 0; 301 302 vcpu->arch.io_gpr = rt; 303 vcpu->arch.mmio_is_bigendian = is_bigendian; 304 vcpu->mmio_needed = 1; 305 vcpu->mmio_is_write = 0; 306 307 return EMULATE_DO_MMIO; 308 } 309 310 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu, 311 u32 val, unsigned int bytes, int is_bigendian) 312 { 313 void *data = run->mmio.data; 314 315 if (bytes > sizeof(run->mmio.data)) { 316 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__, 317 run->mmio.len); 318 } 319 320 run->mmio.phys_addr = vcpu->arch.paddr_accessed; 321 run->mmio.len = bytes; 322 run->mmio.is_write = 1; 323 vcpu->mmio_needed = 1; 324 vcpu->mmio_is_write = 1; 325 326 /* Store the value at the lowest bytes in 'data'. */ 327 if (is_bigendian) { 328 switch (bytes) { 329 case 4: *(u32 *)data = val; break; 330 case 2: *(u16 *)data = val; break; 331 case 1: *(u8 *)data = val; break; 332 } 333 } else { 334 /* Store LE value into 'data'. */ 335 switch (bytes) { 336 case 4: st_le32(data, val); break; 337 case 2: st_le16(data, val); break; 338 case 1: *(u8 *)data = val; break; 339 } 340 } 341 342 return EMULATE_DO_MMIO; 343 } 344 345 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) 346 { 347 int r; 348 sigset_t sigsaved; 349 350 vcpu_load(vcpu); 351 352 if (vcpu->sigset_active) 353 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); 354 355 if (vcpu->mmio_needed) { 356 if (!vcpu->mmio_is_write) 357 kvmppc_complete_mmio_load(vcpu, run); 358 vcpu->mmio_needed = 0; 359 } else if (vcpu->arch.dcr_needed) { 360 if (!vcpu->arch.dcr_is_write) 361 kvmppc_complete_dcr_load(vcpu, run); 362 vcpu->arch.dcr_needed = 0; 363 } 364 365 kvmppc_core_deliver_interrupts(vcpu); 366 367 local_irq_disable(); 368 kvm_guest_enter(); 369 r = __kvmppc_vcpu_run(run, vcpu); 370 kvm_guest_exit(); 371 local_irq_enable(); 372 373 if (vcpu->sigset_active) 374 sigprocmask(SIG_SETMASK, &sigsaved, NULL); 375 376 vcpu_put(vcpu); 377 378 return r; 379 } 380 381 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq) 382 { 383 kvmppc_core_queue_external(vcpu, irq); 384 385 if (waitqueue_active(&vcpu->wq)) { 386 wake_up_interruptible(&vcpu->wq); 387 vcpu->stat.halt_wakeup++; 388 } 389 390 return 0; 391 } 392 393 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, 394 struct kvm_mp_state *mp_state) 395 { 396 return -EINVAL; 397 } 398 399 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, 400 struct kvm_mp_state *mp_state) 401 { 402 return -EINVAL; 403 } 404 405 long kvm_arch_vcpu_ioctl(struct file *filp, 406 unsigned int ioctl, unsigned long arg) 407 { 408 struct kvm_vcpu *vcpu = filp->private_data; 409 void __user *argp = (void __user *)arg; 410 long r; 411 412 switch (ioctl) { 413 case KVM_INTERRUPT: { 414 struct kvm_interrupt irq; 415 r = -EFAULT; 416 if (copy_from_user(&irq, argp, sizeof(irq))) 417 goto out; 418 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq); 419 break; 420 } 421 default: 422 r = -EINVAL; 423 } 424 425 out: 426 return r; 427 } 428 429 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) 430 { 431 return -ENOTSUPP; 432 } 433 434 long kvm_arch_vm_ioctl(struct file *filp, 435 unsigned int ioctl, unsigned long arg) 436 { 437 long r; 438 439 switch (ioctl) { 440 default: 441 r = -EINVAL; 442 } 443 444 return r; 445 } 446 447 int kvm_arch_init(void *opaque) 448 { 449 return 0; 450 } 451 452 void kvm_arch_exit(void) 453 { 454 } 455