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_sync_events(struct kvm *kvm) 129 { 130 } 131 132 void kvm_arch_destroy_vm(struct kvm *kvm) 133 { 134 kvmppc_free_vcpus(kvm); 135 kvm_free_physmem(kvm); 136 kfree(kvm); 137 } 138 139 int kvm_dev_ioctl_check_extension(long ext) 140 { 141 int r; 142 143 switch (ext) { 144 case KVM_CAP_COALESCED_MMIO: 145 r = KVM_COALESCED_MMIO_PAGE_OFFSET; 146 break; 147 default: 148 r = 0; 149 break; 150 } 151 return r; 152 153 } 154 155 long kvm_arch_dev_ioctl(struct file *filp, 156 unsigned int ioctl, unsigned long arg) 157 { 158 return -EINVAL; 159 } 160 161 int kvm_arch_set_memory_region(struct kvm *kvm, 162 struct kvm_userspace_memory_region *mem, 163 struct kvm_memory_slot old, 164 int user_alloc) 165 { 166 return 0; 167 } 168 169 void kvm_arch_flush_shadow(struct kvm *kvm) 170 { 171 } 172 173 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) 174 { 175 struct kvm_vcpu *vcpu; 176 vcpu = kvmppc_core_vcpu_create(kvm, id); 177 kvmppc_create_vcpu_debugfs(vcpu, id); 178 return vcpu; 179 } 180 181 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) 182 { 183 kvmppc_remove_vcpu_debugfs(vcpu); 184 kvmppc_core_vcpu_free(vcpu); 185 } 186 187 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) 188 { 189 kvm_arch_vcpu_free(vcpu); 190 } 191 192 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) 193 { 194 return kvmppc_core_pending_dec(vcpu); 195 } 196 197 static void kvmppc_decrementer_func(unsigned long data) 198 { 199 struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data; 200 201 kvmppc_core_queue_dec(vcpu); 202 203 if (waitqueue_active(&vcpu->wq)) { 204 wake_up_interruptible(&vcpu->wq); 205 vcpu->stat.halt_wakeup++; 206 } 207 } 208 209 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) 210 { 211 setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func, 212 (unsigned long)vcpu); 213 214 return 0; 215 } 216 217 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) 218 { 219 kvmppc_mmu_destroy(vcpu); 220 } 221 222 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) 223 { 224 kvmppc_core_vcpu_load(vcpu, cpu); 225 } 226 227 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) 228 { 229 kvmppc_core_vcpu_put(vcpu); 230 } 231 232 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, 233 struct kvm_guest_debug *dbg) 234 { 235 return -EINVAL; 236 } 237 238 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu, 239 struct kvm_run *run) 240 { 241 ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr]; 242 *gpr = run->dcr.data; 243 } 244 245 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu, 246 struct kvm_run *run) 247 { 248 ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr]; 249 250 if (run->mmio.len > sizeof(*gpr)) { 251 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len); 252 return; 253 } 254 255 if (vcpu->arch.mmio_is_bigendian) { 256 switch (run->mmio.len) { 257 case 4: *gpr = *(u32 *)run->mmio.data; break; 258 case 2: *gpr = *(u16 *)run->mmio.data; break; 259 case 1: *gpr = *(u8 *)run->mmio.data; break; 260 } 261 } else { 262 /* Convert BE data from userland back to LE. */ 263 switch (run->mmio.len) { 264 case 4: *gpr = ld_le32((u32 *)run->mmio.data); break; 265 case 2: *gpr = ld_le16((u16 *)run->mmio.data); break; 266 case 1: *gpr = *(u8 *)run->mmio.data; break; 267 } 268 } 269 } 270 271 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu, 272 unsigned int rt, unsigned int bytes, int is_bigendian) 273 { 274 if (bytes > sizeof(run->mmio.data)) { 275 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__, 276 run->mmio.len); 277 } 278 279 run->mmio.phys_addr = vcpu->arch.paddr_accessed; 280 run->mmio.len = bytes; 281 run->mmio.is_write = 0; 282 283 vcpu->arch.io_gpr = rt; 284 vcpu->arch.mmio_is_bigendian = is_bigendian; 285 vcpu->mmio_needed = 1; 286 vcpu->mmio_is_write = 0; 287 288 return EMULATE_DO_MMIO; 289 } 290 291 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu, 292 u32 val, unsigned int bytes, int is_bigendian) 293 { 294 void *data = run->mmio.data; 295 296 if (bytes > sizeof(run->mmio.data)) { 297 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__, 298 run->mmio.len); 299 } 300 301 run->mmio.phys_addr = vcpu->arch.paddr_accessed; 302 run->mmio.len = bytes; 303 run->mmio.is_write = 1; 304 vcpu->mmio_needed = 1; 305 vcpu->mmio_is_write = 1; 306 307 /* Store the value at the lowest bytes in 'data'. */ 308 if (is_bigendian) { 309 switch (bytes) { 310 case 4: *(u32 *)data = val; break; 311 case 2: *(u16 *)data = val; break; 312 case 1: *(u8 *)data = val; break; 313 } 314 } else { 315 /* Store LE value into 'data'. */ 316 switch (bytes) { 317 case 4: st_le32(data, val); break; 318 case 2: st_le16(data, val); break; 319 case 1: *(u8 *)data = val; break; 320 } 321 } 322 323 return EMULATE_DO_MMIO; 324 } 325 326 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) 327 { 328 int r; 329 sigset_t sigsaved; 330 331 vcpu_load(vcpu); 332 333 if (vcpu->sigset_active) 334 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); 335 336 if (vcpu->mmio_needed) { 337 if (!vcpu->mmio_is_write) 338 kvmppc_complete_mmio_load(vcpu, run); 339 vcpu->mmio_needed = 0; 340 } else if (vcpu->arch.dcr_needed) { 341 if (!vcpu->arch.dcr_is_write) 342 kvmppc_complete_dcr_load(vcpu, run); 343 vcpu->arch.dcr_needed = 0; 344 } 345 346 kvmppc_core_deliver_interrupts(vcpu); 347 348 local_irq_disable(); 349 kvm_guest_enter(); 350 r = __kvmppc_vcpu_run(run, vcpu); 351 kvm_guest_exit(); 352 local_irq_enable(); 353 354 if (vcpu->sigset_active) 355 sigprocmask(SIG_SETMASK, &sigsaved, NULL); 356 357 vcpu_put(vcpu); 358 359 return r; 360 } 361 362 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq) 363 { 364 kvmppc_core_queue_external(vcpu, irq); 365 366 if (waitqueue_active(&vcpu->wq)) { 367 wake_up_interruptible(&vcpu->wq); 368 vcpu->stat.halt_wakeup++; 369 } 370 371 return 0; 372 } 373 374 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, 375 struct kvm_mp_state *mp_state) 376 { 377 return -EINVAL; 378 } 379 380 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, 381 struct kvm_mp_state *mp_state) 382 { 383 return -EINVAL; 384 } 385 386 long kvm_arch_vcpu_ioctl(struct file *filp, 387 unsigned int ioctl, unsigned long arg) 388 { 389 struct kvm_vcpu *vcpu = filp->private_data; 390 void __user *argp = (void __user *)arg; 391 long r; 392 393 switch (ioctl) { 394 case KVM_INTERRUPT: { 395 struct kvm_interrupt irq; 396 r = -EFAULT; 397 if (copy_from_user(&irq, argp, sizeof(irq))) 398 goto out; 399 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq); 400 break; 401 } 402 default: 403 r = -EINVAL; 404 } 405 406 out: 407 return r; 408 } 409 410 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) 411 { 412 return -ENOTSUPP; 413 } 414 415 long kvm_arch_vm_ioctl(struct file *filp, 416 unsigned int ioctl, unsigned long arg) 417 { 418 long r; 419 420 switch (ioctl) { 421 default: 422 r = -EINVAL; 423 } 424 425 return r; 426 } 427 428 int kvm_arch_init(void *opaque) 429 { 430 return 0; 431 } 432 433 void kvm_arch_exit(void) 434 { 435 } 436