arch/powerpc/kvm/powerpc.c

   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 "../mm/mmu_decl.h"
  32
  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_USER_MEMORY:
 141                 r = 1;
 142                 break;
 143         case KVM_CAP_COALESCED_MMIO:
 144                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 145                 break;
 146         default:
 147                 r = 0;
 148                 break;
 149         }
 150         return r;
 151
 152 }
 153
 154 long kvm_arch_dev_ioctl(struct file *filp,
 155                         unsigned int ioctl, unsigned long arg)
 156 {
 157         return -EINVAL;
 158 }
 159
 160 int kvm_arch_set_memory_region(struct kvm *kvm,
 161                                struct kvm_userspace_memory_region *mem,
 162                                struct kvm_memory_slot old,
 163                                int user_alloc)
 164 {
 165         return 0;
 166 }
 167
 168 void kvm_arch_flush_shadow(struct kvm *kvm)
 169 {
 170 }
 171
 172 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 173 {
 174         struct kvm_vcpu *vcpu;
 175         int err;
 176
 177         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 178         if (!vcpu) {
 179                 err = -ENOMEM;
 180                 goto out;
 181         }
 182
 183         err = kvm_vcpu_init(vcpu, kvm, id);
 184         if (err)
 185                 goto free_vcpu;
 186
 187         return vcpu;
 188
 189 free_vcpu:
 190         kmem_cache_free(kvm_vcpu_cache, vcpu);
 191 out:
 192         return ERR_PTR(err);
 193 }
 194
 195 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 196 {
 197         kvm_vcpu_uninit(vcpu);
 198         kmem_cache_free(kvm_vcpu_cache, vcpu);
 199 }
 200
 201 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 202 {
 203         kvm_arch_vcpu_free(vcpu);
 204 }
 205
 206 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 207 {
 208         return kvmppc_core_pending_dec(vcpu);
 209 }
 210
 211 static void kvmppc_decrementer_func(unsigned long data)
 212 {
 213         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 214
 215         kvmppc_core_queue_dec(vcpu);
 216
 217         if (waitqueue_active(&vcpu->wq)) {
 218                 wake_up_interruptible(&vcpu->wq);
 219                 vcpu->stat.halt_wakeup++;
 220         }
 221 }
 222
 223 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 224 {
 225         setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func,
 226                     (unsigned long)vcpu);
 227
 228         return 0;
 229 }
 230
 231 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 232 {
 233         kvmppc_core_destroy_mmu(vcpu);
 234 }
 235
 236 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 237 {
 238         if (vcpu->guest_debug.enabled)
 239                 kvmppc_core_load_guest_debugstate(vcpu);
 240
 241         kvmppc_core_vcpu_load(vcpu, cpu);
 242 }
 243
 244 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 245 {
 246         if (vcpu->guest_debug.enabled)
 247                 kvmppc_core_load_host_debugstate(vcpu);
 248
 249         /* Don't leave guest TLB entries resident when being de-scheduled. */
 250         /* XXX It would be nice to differentiate between heavyweight exit and
 251          * sched_out here, since we could avoid the TLB flush for heavyweight
 252          * exits. */
 253         _tlbil_all();
 254         kvmppc_core_vcpu_put(vcpu);
 255 }
 256
 257 int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
 258                                     struct kvm_debug_guest *dbg)
 259 {
 260         int i;
 261
 262         vcpu->guest_debug.enabled = dbg->enabled;
 263         if (vcpu->guest_debug.enabled) {
 264                 for (i=0; i < ARRAY_SIZE(vcpu->guest_debug.bp); i++) {
 265                         if (dbg->breakpoints[i].enabled)
 266                                 vcpu->guest_debug.bp[i] = dbg->breakpoints[i].address;
 267                         else
 268                                 vcpu->guest_debug.bp[i] = 0;
 269                 }
 270         }
 271
 272         return 0;
 273 }
 274
 275 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 276                                      struct kvm_run *run)
 277 {
 278         u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 279         *gpr = run->dcr.data;
 280 }
 281
 282 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 283                                       struct kvm_run *run)
 284 {
 285         u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 286
 287         if (run->mmio.len > sizeof(*gpr)) {
 288                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 289                 return;
 290         }
 291
 292         if (vcpu->arch.mmio_is_bigendian) {
 293                 switch (run->mmio.len) {
 294                 case 4: *gpr = *(u32 *)run->mmio.data; break;
 295                 case 2: *gpr = *(u16 *)run->mmio.data; break;
 296                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 297                 }
 298         } else {
 299                 /* Convert BE data from userland back to LE. */
 300                 switch (run->mmio.len) {
 301                 case 4: *gpr = ld_le32((u32 *)run->mmio.data); break;
 302                 case 2: *gpr = ld_le16((u16 *)run->mmio.data); break;
 303                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 304                 }
 305         }
 306 }
 307
 308 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 309                        unsigned int rt, unsigned int bytes, int is_bigendian)
 310 {
 311         if (bytes > sizeof(run->mmio.data)) {
 312                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 313                        run->mmio.len);
 314         }
 315
 316         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 317         run->mmio.len = bytes;
 318         run->mmio.is_write = 0;
 319
 320         vcpu->arch.io_gpr = rt;
 321         vcpu->arch.mmio_is_bigendian = is_bigendian;
 322         vcpu->mmio_needed = 1;
 323         vcpu->mmio_is_write = 0;
 324
 325         return EMULATE_DO_MMIO;
 326 }
 327
 328 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 329                         u32 val, unsigned int bytes, int is_bigendian)
 330 {
 331         void *data = run->mmio.data;
 332
 333         if (bytes > sizeof(run->mmio.data)) {
 334                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 335                        run->mmio.len);
 336         }
 337
 338         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 339         run->mmio.len = bytes;
 340         run->mmio.is_write = 1;
 341         vcpu->mmio_needed = 1;
 342         vcpu->mmio_is_write = 1;
 343
 344         /* Store the value at the lowest bytes in 'data'. */
 345         if (is_bigendian) {
 346                 switch (bytes) {
 347                 case 4: *(u32 *)data = val; break;
 348                 case 2: *(u16 *)data = val; break;
 349                 case 1: *(u8  *)data = val; break;
 350                 }
 351         } else {
 352                 /* Store LE value into 'data'. */
 353                 switch (bytes) {
 354                 case 4: st_le32(data, val); break;
 355                 case 2: st_le16(data, val); break;
 356                 case 1: *(u8 *)data = val; break;
 357                 }
 358         }
 359
 360         return EMULATE_DO_MMIO;
 361 }
 362
 363 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 364 {
 365         int r;
 366         sigset_t sigsaved;
 367
 368         vcpu_load(vcpu);
 369
 370         if (vcpu->sigset_active)
 371                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 372
 373         if (vcpu->mmio_needed) {
 374                 if (!vcpu->mmio_is_write)
 375                         kvmppc_complete_mmio_load(vcpu, run);
 376                 vcpu->mmio_needed = 0;
 377         } else if (vcpu->arch.dcr_needed) {
 378                 if (!vcpu->arch.dcr_is_write)
 379                         kvmppc_complete_dcr_load(vcpu, run);
 380                 vcpu->arch.dcr_needed = 0;
 381         }
 382
 383         kvmppc_core_deliver_interrupts(vcpu);
 384
 385         local_irq_disable();
 386         kvm_guest_enter();
 387         r = __kvmppc_vcpu_run(run, vcpu);
 388         kvm_guest_exit();
 389         local_irq_enable();
 390
 391         if (vcpu->sigset_active)
 392                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 393
 394         vcpu_put(vcpu);
 395
 396         return r;
 397 }
 398
 399 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 400 {
 401         kvmppc_core_queue_external(vcpu, irq);
 402
 403         if (waitqueue_active(&vcpu->wq)) {
 404                 wake_up_interruptible(&vcpu->wq);
 405                 vcpu->stat.halt_wakeup++;
 406         }
 407
 408         return 0;
 409 }
 410
 411 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 412                                     struct kvm_mp_state *mp_state)
 413 {
 414         return -EINVAL;
 415 }
 416
 417 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 418                                     struct kvm_mp_state *mp_state)
 419 {
 420         return -EINVAL;
 421 }
 422
 423 long kvm_arch_vcpu_ioctl(struct file *filp,
 424                          unsigned int ioctl, unsigned long arg)
 425 {
 426         struct kvm_vcpu *vcpu = filp->private_data;
 427         void __user *argp = (void __user *)arg;
 428         long r;
 429
 430         switch (ioctl) {
 431         case KVM_INTERRUPT: {
 432                 struct kvm_interrupt irq;
 433                 r = -EFAULT;
 434                 if (copy_from_user(&irq, argp, sizeof(irq)))
 435                         goto out;
 436                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 437                 break;
 438         }
 439         default:
 440                 r = -EINVAL;
 441         }
 442
 443 out:
 444         return r;
 445 }
 446
 447 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 448 {
 449         return -ENOTSUPP;
 450 }
 451
 452 long kvm_arch_vm_ioctl(struct file *filp,
 453                        unsigned int ioctl, unsigned long arg)
 454 {
 455         long r;
 456
 457         switch (ioctl) {
 458         default:
 459                 r = -EINVAL;
 460         }
 461
 462         return r;
 463 }
 464
 465 int kvm_arch_init(void *opaque)
 466 {
 467         return 0;
 468 }
 469
 470 void kvm_arch_exit(void)
 471 {
 472 }