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         if (!IS_ERR(vcpu))
 197                 kvmppc_create_vcpu_debugfs(vcpu, id);
 198         return vcpu;
 199 }
 200
 201 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 202 {
 203         kvmppc_remove_vcpu_debugfs(vcpu);
 204         kvmppc_core_vcpu_free(vcpu);
 205 }
 206
 207 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 208 {
 209         kvm_arch_vcpu_free(vcpu);
 210 }
 211
 212 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 213 {
 214         return kvmppc_core_pending_dec(vcpu);
 215 }
 216
 217 static void kvmppc_decrementer_func(unsigned long data)
 218 {
 219         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 220
 221         kvmppc_core_queue_dec(vcpu);
 222
 223         if (waitqueue_active(&vcpu->wq)) {
 224                 wake_up_interruptible(&vcpu->wq);
 225                 vcpu->stat.halt_wakeup++;
 226         }
 227 }
 228
 229 /*
 230  * low level hrtimer wake routine. Because this runs in hardirq context
 231  * we schedule a tasklet to do the real work.
 232  */
 233 enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
 234 {
 235         struct kvm_vcpu *vcpu;
 236
 237         vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
 238         tasklet_schedule(&vcpu->arch.tasklet);
 239
 240         return HRTIMER_NORESTART;
 241 }
 242
 243 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 244 {
 245         hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
 246         tasklet_init(&vcpu->arch.tasklet, kvmppc_decrementer_func, (ulong)vcpu);
 247         vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
 248
 249         return 0;
 250 }
 251
 252 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 253 {
 254         kvmppc_mmu_destroy(vcpu);
 255 }
 256
 257 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 258 {
 259         kvmppc_core_vcpu_load(vcpu, cpu);
 260 }
 261
 262 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 263 {
 264         kvmppc_core_vcpu_put(vcpu);
 265 }
 266
 267 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 268                                         struct kvm_guest_debug *dbg)
 269 {
 270         return -EINVAL;
 271 }
 272
 273 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 274                                      struct kvm_run *run)
 275 {
 276         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, run->dcr.data);
 277 }
 278
 279 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 280                                       struct kvm_run *run)
 281 {
 282         ulong gpr;
 283
 284         if (run->mmio.len > sizeof(gpr)) {
 285                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 286                 return;
 287         }
 288
 289         if (vcpu->arch.mmio_is_bigendian) {
 290                 switch (run->mmio.len) {
 291                 case 4: gpr = *(u32 *)run->mmio.data; break;
 292                 case 2: gpr = *(u16 *)run->mmio.data; break;
 293                 case 1: gpr = *(u8 *)run->mmio.data; break;
 294                 }
 295         } else {
 296                 /* Convert BE data from userland back to LE. */
 297                 switch (run->mmio.len) {
 298                 case 4: gpr = ld_le32((u32 *)run->mmio.data); break;
 299                 case 2: gpr = ld_le16((u16 *)run->mmio.data); break;
 300                 case 1: gpr = *(u8 *)run->mmio.data; break;
 301                 }
 302         }
 303
 304         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 305 }
 306
 307 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 308                        unsigned int rt, unsigned int bytes, int is_bigendian)
 309 {
 310         if (bytes > sizeof(run->mmio.data)) {
 311                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 312                        run->mmio.len);
 313         }
 314
 315         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 316         run->mmio.len = bytes;
 317         run->mmio.is_write = 0;
 318
 319         vcpu->arch.io_gpr = rt;
 320         vcpu->arch.mmio_is_bigendian = is_bigendian;
 321         vcpu->mmio_needed = 1;
 322         vcpu->mmio_is_write = 0;
 323
 324         return EMULATE_DO_MMIO;
 325 }
 326
 327 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 328                         u32 val, unsigned int bytes, int is_bigendian)
 329 {
 330         void *data = run->mmio.data;
 331
 332         if (bytes > sizeof(run->mmio.data)) {
 333                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 334                        run->mmio.len);
 335         }
 336
 337         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 338         run->mmio.len = bytes;
 339         run->mmio.is_write = 1;
 340         vcpu->mmio_needed = 1;
 341         vcpu->mmio_is_write = 1;
 342
 343         /* Store the value at the lowest bytes in 'data'. */
 344         if (is_bigendian) {
 345                 switch (bytes) {
 346                 case 4: *(u32 *)data = val; break;
 347                 case 2: *(u16 *)data = val; break;
 348                 case 1: *(u8  *)data = val; break;
 349                 }
 350         } else {
 351                 /* Store LE value into 'data'. */
 352                 switch (bytes) {
 353                 case 4: st_le32(data, val); break;
 354                 case 2: st_le16(data, val); break;
 355                 case 1: *(u8 *)data = val; break;
 356                 }
 357         }
 358
 359         return EMULATE_DO_MMIO;
 360 }
 361
 362 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 363 {
 364         int r;
 365         sigset_t sigsaved;
 366
 367         vcpu_load(vcpu);
 368
 369         if (vcpu->sigset_active)
 370                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 371
 372         if (vcpu->mmio_needed) {
 373                 if (!vcpu->mmio_is_write)
 374                         kvmppc_complete_mmio_load(vcpu, run);
 375                 vcpu->mmio_needed = 0;
 376         } else if (vcpu->arch.dcr_needed) {
 377                 if (!vcpu->arch.dcr_is_write)
 378                         kvmppc_complete_dcr_load(vcpu, run);
 379                 vcpu->arch.dcr_needed = 0;
 380         }
 381
 382         kvmppc_core_deliver_interrupts(vcpu);
 383
 384         local_irq_disable();
 385         kvm_guest_enter();
 386         r = __kvmppc_vcpu_run(run, vcpu);
 387         kvm_guest_exit();
 388         local_irq_enable();
 389
 390         if (vcpu->sigset_active)
 391                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 392
 393         vcpu_put(vcpu);
 394
 395         return r;
 396 }
 397
 398 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 399 {
 400         kvmppc_core_queue_external(vcpu, irq);
 401
 402         if (waitqueue_active(&vcpu->wq)) {
 403                 wake_up_interruptible(&vcpu->wq);
 404                 vcpu->stat.halt_wakeup++;
 405         }
 406
 407         return 0;
 408 }
 409
 410 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 411                                     struct kvm_mp_state *mp_state)
 412 {
 413         return -EINVAL;
 414 }
 415
 416 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 417                                     struct kvm_mp_state *mp_state)
 418 {
 419         return -EINVAL;
 420 }
 421
 422 long kvm_arch_vcpu_ioctl(struct file *filp,
 423                          unsigned int ioctl, unsigned long arg)
 424 {
 425         struct kvm_vcpu *vcpu = filp->private_data;
 426         void __user *argp = (void __user *)arg;
 427         long r;
 428
 429         switch (ioctl) {
 430         case KVM_INTERRUPT: {
 431                 struct kvm_interrupt irq;
 432                 r = -EFAULT;
 433                 if (copy_from_user(&irq, argp, sizeof(irq)))
 434                         goto out;
 435                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 436                 break;
 437         }
 438         default:
 439                 r = -EINVAL;
 440         }
 441
 442 out:
 443         return r;
 444 }
 445
 446 long kvm_arch_vm_ioctl(struct file *filp,
 447                        unsigned int ioctl, unsigned long arg)
 448 {
 449         long r;
 450
 451         switch (ioctl) {
 452         default:
 453                 r = -ENOTTY;
 454         }
 455
 456         return r;
 457 }
 458
 459 int kvm_arch_init(void *opaque)
 460 {
 461         return 0;
 462 }
 463
 464 void kvm_arch_exit(void)
 465 {
 466 }