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/hrtimer.h>
  27 #include <linux/fs.h>
  28 #include <linux/slab.h>
  29 #include <asm/cputable.h>
  30 #include <asm/uaccess.h>
  31 #include <asm/kvm_ppc.h>
  32 #include <asm/tlbflush.h>
  33 #include "timing.h"
  34 #include "../mm/mmu_decl.h"
  35
  36 #define CREATE_TRACE_POINTS
  37 #include "trace.h"
  38
  39 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
  40 {
  41         return gfn;
  42 }
  43
  44 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
  45 {
  46         return !(v->arch.msr & MSR_WE) || !!(v->arch.pending_exceptions);
  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 int kvm_arch_hardware_enable(void *garbage)
  84 {
  85         return 0;
  86 }
  87
  88 void kvm_arch_hardware_disable(void *garbage)
  89 {
  90 }
  91
  92 int kvm_arch_hardware_setup(void)
  93 {
  94         return 0;
  95 }
  96
  97 void kvm_arch_hardware_unsetup(void)
  98 {
  99 }
 100
 101 void kvm_arch_check_processor_compat(void *rtn)
 102 {
 103         *(int *)rtn = kvmppc_core_check_processor_compat();
 104 }
 105
 106 struct kvm *kvm_arch_create_vm(void)
 107 {
 108         struct kvm *kvm;
 109
 110         kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
 111         if (!kvm)
 112                 return ERR_PTR(-ENOMEM);
 113
 114         return kvm;
 115 }
 116
 117 static void kvmppc_free_vcpus(struct kvm *kvm)
 118 {
 119         unsigned int i;
 120         struct kvm_vcpu *vcpu;
 121
 122         kvm_for_each_vcpu(i, vcpu, kvm)
 123                 kvm_arch_vcpu_free(vcpu);
 124
 125         mutex_lock(&kvm->lock);
 126         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
 127                 kvm->vcpus[i] = NULL;
 128
 129         atomic_set(&kvm->online_vcpus, 0);
 130         mutex_unlock(&kvm->lock);
 131 }
 132
 133 void kvm_arch_sync_events(struct kvm *kvm)
 134 {
 135 }
 136
 137 void kvm_arch_destroy_vm(struct kvm *kvm)
 138 {
 139         kvmppc_free_vcpus(kvm);
 140         kvm_free_physmem(kvm);
 141         cleanup_srcu_struct(&kvm->srcu);
 142         kfree(kvm);
 143 }
 144
 145 int kvm_dev_ioctl_check_extension(long ext)
 146 {
 147         int r;
 148
 149         switch (ext) {
 150         case KVM_CAP_PPC_SEGSTATE:
 151                 r = 1;
 152                 break;
 153         case KVM_CAP_COALESCED_MMIO:
 154                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 155                 break;
 156         default:
 157                 r = 0;
 158                 break;
 159         }
 160         return r;
 161
 162 }
 163
 164 long kvm_arch_dev_ioctl(struct file *filp,
 165                         unsigned int ioctl, unsigned long arg)
 166 {
 167         return -EINVAL;
 168 }
 169
 170 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 171                                    struct kvm_memory_slot *memslot,
 172                                    struct kvm_memory_slot old,
 173                                    struct kvm_userspace_memory_region *mem,
 174                                    int user_alloc)
 175 {
 176         return 0;
 177 }
 178
 179 void kvm_arch_commit_memory_region(struct kvm *kvm,
 180                struct kvm_userspace_memory_region *mem,
 181                struct kvm_memory_slot old,
 182                int user_alloc)
 183 {
 184        return;
 185 }
 186
 187
 188 void kvm_arch_flush_shadow(struct kvm *kvm)
 189 {
 190 }
 191
 192 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 193 {
 194         struct kvm_vcpu *vcpu;
 195         vcpu = kvmppc_core_vcpu_create(kvm, id);
 196         kvmppc_create_vcpu_debugfs(vcpu, id);
 197         return vcpu;
 198 }
 199
 200 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 201 {
 202         kvmppc_remove_vcpu_debugfs(vcpu);
 203         kvmppc_core_vcpu_free(vcpu);
 204 }
 205
 206 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 207 {
 208         kvm_arch_vcpu_free(vcpu);
 209 }
 210
 211 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 212 {
 213         return kvmppc_core_pending_dec(vcpu);
 214 }
 215
 216 static void kvmppc_decrementer_func(unsigned long data)
 217 {
 218         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 219
 220         kvmppc_core_queue_dec(vcpu);
 221
 222         if (waitqueue_active(&vcpu->wq)) {
 223                 wake_up_interruptible(&vcpu->wq);
 224                 vcpu->stat.halt_wakeup++;
 225         }
 226 }
 227
 228 /*
 229  * low level hrtimer wake routine. Because this runs in hardirq context
 230  * we schedule a tasklet to do the real work.
 231  */
 232 enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
 233 {
 234         struct kvm_vcpu *vcpu;
 235
 236         vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
 237         tasklet_schedule(&vcpu->arch.tasklet);
 238
 239         return HRTIMER_NORESTART;
 240 }
 241
 242 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 243 {
 244         hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
 245         tasklet_init(&vcpu->arch.tasklet, kvmppc_decrementer_func, (ulong)vcpu);
 246         vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
 247
 248         return 0;
 249 }
 250
 251 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 252 {
 253         kvmppc_mmu_destroy(vcpu);
 254 }
 255
 256 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 257 {
 258         kvmppc_core_vcpu_load(vcpu, cpu);
 259 }
 260
 261 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 262 {
 263         kvmppc_core_vcpu_put(vcpu);
 264 }
 265
 266 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 267                                         struct kvm_guest_debug *dbg)
 268 {
 269         return -EINVAL;
 270 }
 271
 272 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 273                                      struct kvm_run *run)
 274 {
 275         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, run->dcr.data);
 276 }
 277
 278 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 279                                       struct kvm_run *run)
 280 {
 281         ulong gpr;
 282
 283         if (run->mmio.len > sizeof(gpr)) {
 284                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 285                 return;
 286         }
 287
 288         if (vcpu->arch.mmio_is_bigendian) {
 289                 switch (run->mmio.len) {
 290                 case 4: gpr = *(u32 *)run->mmio.data; break;
 291                 case 2: gpr = *(u16 *)run->mmio.data; break;
 292                 case 1: gpr = *(u8 *)run->mmio.data; break;
 293                 }
 294         } else {
 295                 /* Convert BE data from userland back to LE. */
 296                 switch (run->mmio.len) {
 297                 case 4: gpr = ld_le32((u32 *)run->mmio.data); break;
 298                 case 2: gpr = ld_le16((u16 *)run->mmio.data); break;
 299                 case 1: gpr = *(u8 *)run->mmio.data; break;
 300                 }
 301         }
 302
 303         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 304 }
 305
 306 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 307                        unsigned int rt, unsigned int bytes, int is_bigendian)
 308 {
 309         if (bytes > sizeof(run->mmio.data)) {
 310                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 311                        run->mmio.len);
 312         }
 313
 314         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 315         run->mmio.len = bytes;
 316         run->mmio.is_write = 0;
 317
 318         vcpu->arch.io_gpr = rt;
 319         vcpu->arch.mmio_is_bigendian = is_bigendian;
 320         vcpu->mmio_needed = 1;
 321         vcpu->mmio_is_write = 0;
 322
 323         return EMULATE_DO_MMIO;
 324 }
 325
 326 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 327                         u32 val, unsigned int bytes, int is_bigendian)
 328 {
 329         void *data = run->mmio.data;
 330
 331         if (bytes > sizeof(run->mmio.data)) {
 332                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 333                        run->mmio.len);
 334         }
 335
 336         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 337         run->mmio.len = bytes;
 338         run->mmio.is_write = 1;
 339         vcpu->mmio_needed = 1;
 340         vcpu->mmio_is_write = 1;
 341
 342         /* Store the value at the lowest bytes in 'data'. */
 343         if (is_bigendian) {
 344                 switch (bytes) {
 345                 case 4: *(u32 *)data = val; break;
 346                 case 2: *(u16 *)data = val; break;
 347                 case 1: *(u8  *)data = val; break;
 348                 }
 349         } else {
 350                 /* Store LE value into 'data'. */
 351                 switch (bytes) {
 352                 case 4: st_le32(data, val); break;
 353                 case 2: st_le16(data, val); break;
 354                 case 1: *(u8 *)data = val; break;
 355                 }
 356         }
 357
 358         return EMULATE_DO_MMIO;
 359 }
 360
 361 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 362 {
 363         int r;
 364         sigset_t sigsaved;
 365
 366         vcpu_load(vcpu);
 367
 368         if (vcpu->sigset_active)
 369                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 370
 371         if (vcpu->mmio_needed) {
 372                 if (!vcpu->mmio_is_write)
 373                         kvmppc_complete_mmio_load(vcpu, run);
 374                 vcpu->mmio_needed = 0;
 375         } else if (vcpu->arch.dcr_needed) {
 376                 if (!vcpu->arch.dcr_is_write)
 377                         kvmppc_complete_dcr_load(vcpu, run);
 378                 vcpu->arch.dcr_needed = 0;
 379         }
 380
 381         kvmppc_core_deliver_interrupts(vcpu);
 382
 383         local_irq_disable();
 384         kvm_guest_enter();
 385         r = __kvmppc_vcpu_run(run, vcpu);
 386         kvm_guest_exit();
 387         local_irq_enable();
 388
 389         if (vcpu->sigset_active)
 390                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 391
 392         vcpu_put(vcpu);
 393
 394         return r;
 395 }
 396
 397 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 398 {
 399         kvmppc_core_queue_external(vcpu, irq);
 400
 401         if (waitqueue_active(&vcpu->wq)) {
 402                 wake_up_interruptible(&vcpu->wq);
 403                 vcpu->stat.halt_wakeup++;
 404         }
 405
 406         return 0;
 407 }
 408
 409 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 410                                     struct kvm_mp_state *mp_state)
 411 {
 412         return -EINVAL;
 413 }
 414
 415 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 416                                     struct kvm_mp_state *mp_state)
 417 {
 418         return -EINVAL;
 419 }
 420
 421 long kvm_arch_vcpu_ioctl(struct file *filp,
 422                          unsigned int ioctl, unsigned long arg)
 423 {
 424         struct kvm_vcpu *vcpu = filp->private_data;
 425         void __user *argp = (void __user *)arg;
 426         long r;
 427
 428         switch (ioctl) {
 429         case KVM_INTERRUPT: {
 430                 struct kvm_interrupt irq;
 431                 r = -EFAULT;
 432                 if (copy_from_user(&irq, argp, sizeof(irq)))
 433                         goto out;
 434                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 435                 break;
 436         }
 437         default:
 438                 r = -EINVAL;
 439         }
 440
 441 out:
 442         return r;
 443 }
 444
 445 long kvm_arch_vm_ioctl(struct file *filp,
 446                        unsigned int ioctl, unsigned long arg)
 447 {
 448         long r;
 449
 450         switch (ioctl) {
 451         default:
 452                 r = -ENOTTY;
 453         }
 454
 455         return r;
 456 }
 457
 458 int kvm_arch_init(void *opaque)
 459 {
 460         return 0;
 461 }
 462
 463 void kvm_arch_exit(void)
 464 {
 465 }