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 <asm/cputable.h>
  29 #include <asm/uaccess.h>
  30 #include <asm/kvm_ppc.h>
  31 #include <asm/tlbflush.h>
  32 #include "timing.h"
  33 #include "../mm/mmu_decl.h"
  34
  35 #define CREATE_TRACE_POINTS
  36 #include "trace.h"
  37
  38 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
  39 {
  40         return gfn;
  41 }
  42
  43 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
  44 {
  45         return !(v->arch.msr & MSR_WE) || !!(v->arch.pending_exceptions);
  46 }
  47
  48
  49 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
  50 {
  51         enum emulation_result er;
  52         int r;
  53
  54         er = kvmppc_emulate_instruction(run, vcpu);
  55         switch (er) {
  56         case EMULATE_DONE:
  57                 /* Future optimization: only reload non-volatiles if they were
  58                  * actually modified. */
  59                 r = RESUME_GUEST_NV;
  60                 break;
  61         case EMULATE_DO_MMIO:
  62                 run->exit_reason = KVM_EXIT_MMIO;
  63                 /* We must reload nonvolatiles because "update" load/store
  64                  * instructions modify register state. */
  65                 /* Future optimization: only reload non-volatiles if they were
  66                  * actually modified. */
  67                 r = RESUME_HOST_NV;
  68                 break;
  69         case EMULATE_FAIL:
  70                 /* XXX Deliver Program interrupt to guest. */
  71                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
  72                        vcpu->arch.last_inst);
  73                 r = RESUME_HOST;
  74                 break;
  75         default:
  76                 BUG();
  77         }
  78
  79         return r;
  80 }
  81
  82 int kvm_arch_hardware_enable(void *garbage)
  83 {
  84         return 0;
  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         struct kvm_vcpu *vcpu;
 120
 121         kvm_for_each_vcpu(i, vcpu, kvm)
 122                 kvm_arch_vcpu_free(vcpu);
 123
 124         mutex_lock(&kvm->lock);
 125         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
 126                 kvm->vcpus[i] = NULL;
 127
 128         atomic_set(&kvm->online_vcpus, 0);
 129         mutex_unlock(&kvm->lock);
 130 }
 131
 132 void kvm_arch_sync_events(struct kvm *kvm)
 133 {
 134 }
 135
 136 void kvm_arch_destroy_vm(struct kvm *kvm)
 137 {
 138         kvmppc_free_vcpus(kvm);
 139         kvm_free_physmem(kvm);
 140         kfree(kvm);
 141 }
 142
 143 int kvm_dev_ioctl_check_extension(long ext)
 144 {
 145         int r;
 146
 147         switch (ext) {
 148         case KVM_CAP_PPC_SEGSTATE:
 149                 r = 1;
 150                 break;
 151         case KVM_CAP_COALESCED_MMIO:
 152                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 153                 break;
 154         default:
 155                 r = 0;
 156                 break;
 157         }
 158         return r;
 159
 160 }
 161
 162 long kvm_arch_dev_ioctl(struct file *filp,
 163                         unsigned int ioctl, unsigned long arg)
 164 {
 165         return -EINVAL;
 166 }
 167
 168 int kvm_arch_set_memory_region(struct kvm *kvm,
 169                                struct kvm_userspace_memory_region *mem,
 170                                struct kvm_memory_slot old,
 171                                int user_alloc)
 172 {
 173         return 0;
 174 }
 175
 176 void kvm_arch_flush_shadow(struct kvm *kvm)
 177 {
 178 }
 179
 180 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 181 {
 182         struct kvm_vcpu *vcpu;
 183         vcpu = kvmppc_core_vcpu_create(kvm, id);
 184         kvmppc_create_vcpu_debugfs(vcpu, id);
 185         return vcpu;
 186 }
 187
 188 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 189 {
 190         kvmppc_remove_vcpu_debugfs(vcpu);
 191         kvmppc_core_vcpu_free(vcpu);
 192 }
 193
 194 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 195 {
 196         kvm_arch_vcpu_free(vcpu);
 197 }
 198
 199 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 200 {
 201         return kvmppc_core_pending_dec(vcpu);
 202 }
 203
 204 static void kvmppc_decrementer_func(unsigned long data)
 205 {
 206         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 207
 208         kvmppc_core_queue_dec(vcpu);
 209
 210         if (waitqueue_active(&vcpu->wq)) {
 211                 wake_up_interruptible(&vcpu->wq);
 212                 vcpu->stat.halt_wakeup++;
 213         }
 214 }
 215
 216 /*
 217  * low level hrtimer wake routine. Because this runs in hardirq context
 218  * we schedule a tasklet to do the real work.
 219  */
 220 enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
 221 {
 222         struct kvm_vcpu *vcpu;
 223
 224         vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
 225         tasklet_schedule(&vcpu->arch.tasklet);
 226
 227         return HRTIMER_NORESTART;
 228 }
 229
 230 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 231 {
 232         hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
 233         tasklet_init(&vcpu->arch.tasklet, kvmppc_decrementer_func, (ulong)vcpu);
 234         vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
 235
 236         return 0;
 237 }
 238
 239 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 240 {
 241         kvmppc_mmu_destroy(vcpu);
 242 }
 243
 244 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 245 {
 246         kvmppc_core_vcpu_load(vcpu, cpu);
 247 }
 248
 249 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 250 {
 251         kvmppc_core_vcpu_put(vcpu);
 252 }
 253
 254 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 255                                         struct kvm_guest_debug *dbg)
 256 {
 257         return -EINVAL;
 258 }
 259
 260 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 261                                      struct kvm_run *run)
 262 {
 263         ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 264         *gpr = run->dcr.data;
 265 }
 266
 267 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 268                                       struct kvm_run *run)
 269 {
 270         ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 271
 272         if (run->mmio.len > sizeof(*gpr)) {
 273                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 274                 return;
 275         }
 276
 277         if (vcpu->arch.mmio_is_bigendian) {
 278                 switch (run->mmio.len) {
 279                 case 4: *gpr = *(u32 *)run->mmio.data; break;
 280                 case 2: *gpr = *(u16 *)run->mmio.data; break;
 281                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 282                 }
 283         } else {
 284                 /* Convert BE data from userland back to LE. */
 285                 switch (run->mmio.len) {
 286                 case 4: *gpr = ld_le32((u32 *)run->mmio.data); break;
 287                 case 2: *gpr = ld_le16((u16 *)run->mmio.data); break;
 288                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 289                 }
 290         }
 291 }
 292
 293 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 294                        unsigned int rt, unsigned int bytes, int is_bigendian)
 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 = 0;
 304
 305         vcpu->arch.io_gpr = rt;
 306         vcpu->arch.mmio_is_bigendian = is_bigendian;
 307         vcpu->mmio_needed = 1;
 308         vcpu->mmio_is_write = 0;
 309
 310         return EMULATE_DO_MMIO;
 311 }
 312
 313 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 314                         u32 val, unsigned int bytes, int is_bigendian)
 315 {
 316         void *data = run->mmio.data;
 317
 318         if (bytes > sizeof(run->mmio.data)) {
 319                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 320                        run->mmio.len);
 321         }
 322
 323         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 324         run->mmio.len = bytes;
 325         run->mmio.is_write = 1;
 326         vcpu->mmio_needed = 1;
 327         vcpu->mmio_is_write = 1;
 328
 329         /* Store the value at the lowest bytes in 'data'. */
 330         if (is_bigendian) {
 331                 switch (bytes) {
 332                 case 4: *(u32 *)data = val; break;
 333                 case 2: *(u16 *)data = val; break;
 334                 case 1: *(u8  *)data = val; break;
 335                 }
 336         } else {
 337                 /* Store LE value into 'data'. */
 338                 switch (bytes) {
 339                 case 4: st_le32(data, val); break;
 340                 case 2: st_le16(data, val); break;
 341                 case 1: *(u8 *)data = val; break;
 342                 }
 343         }
 344
 345         return EMULATE_DO_MMIO;
 346 }
 347
 348 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 349 {
 350         int r;
 351         sigset_t sigsaved;
 352
 353         vcpu_load(vcpu);
 354
 355         if (vcpu->sigset_active)
 356                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 357
 358         if (vcpu->mmio_needed) {
 359                 if (!vcpu->mmio_is_write)
 360                         kvmppc_complete_mmio_load(vcpu, run);
 361                 vcpu->mmio_needed = 0;
 362         } else if (vcpu->arch.dcr_needed) {
 363                 if (!vcpu->arch.dcr_is_write)
 364                         kvmppc_complete_dcr_load(vcpu, run);
 365                 vcpu->arch.dcr_needed = 0;
 366         }
 367
 368         kvmppc_core_deliver_interrupts(vcpu);
 369
 370         local_irq_disable();
 371         kvm_guest_enter();
 372         r = __kvmppc_vcpu_run(run, vcpu);
 373         kvm_guest_exit();
 374         local_irq_enable();
 375
 376         if (vcpu->sigset_active)
 377                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 378
 379         vcpu_put(vcpu);
 380
 381         return r;
 382 }
 383
 384 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 385 {
 386         kvmppc_core_queue_external(vcpu, irq);
 387
 388         if (waitqueue_active(&vcpu->wq)) {
 389                 wake_up_interruptible(&vcpu->wq);
 390                 vcpu->stat.halt_wakeup++;
 391         }
 392
 393         return 0;
 394 }
 395
 396 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 397                                     struct kvm_mp_state *mp_state)
 398 {
 399         return -EINVAL;
 400 }
 401
 402 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 403                                     struct kvm_mp_state *mp_state)
 404 {
 405         return -EINVAL;
 406 }
 407
 408 long kvm_arch_vcpu_ioctl(struct file *filp,
 409                          unsigned int ioctl, unsigned long arg)
 410 {
 411         struct kvm_vcpu *vcpu = filp->private_data;
 412         void __user *argp = (void __user *)arg;
 413         long r;
 414
 415         switch (ioctl) {
 416         case KVM_INTERRUPT: {
 417                 struct kvm_interrupt irq;
 418                 r = -EFAULT;
 419                 if (copy_from_user(&irq, argp, sizeof(irq)))
 420                         goto out;
 421                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 422                 break;
 423         }
 424         default:
 425                 r = -EINVAL;
 426         }
 427
 428 out:
 429         return r;
 430 }
 431
 432 long kvm_arch_vm_ioctl(struct file *filp,
 433                        unsigned int ioctl, unsigned long arg)
 434 {
 435         long r;
 436
 437         switch (ioctl) {
 438         default:
 439                 r = -ENOTTY;
 440         }
 441
 442         return r;
 443 }
 444
 445 int kvm_arch_init(void *opaque)
 446 {
 447         return 0;
 448 }
 449
 450 void kvm_arch_exit(void)
 451 {
 452 }