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 "timing.h"
  32 #include "../mm/mmu_decl.h"
  33
  34 #define CREATE_TRACE_POINTS
  35 #include "trace.h"
  36
  37 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
  38 {
  39         return gfn;
  40 }
  41
  42 int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
  43 {
  44         return !!(v->arch.pending_exceptions);
  45 }
  46
  47 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu)
  48 {
  49         /* do real check here */
  50         return 1;
  51 }
  52
  53 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
  54 {
  55         return !(v->arch.msr & MSR_WE);
  56 }
  57
  58
  59 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
  60 {
  61         enum emulation_result er;
  62         int r;
  63
  64         er = kvmppc_emulate_instruction(run, vcpu);
  65         switch (er) {
  66         case EMULATE_DONE:
  67                 /* Future optimization: only reload non-volatiles if they were
  68                  * actually modified. */
  69                 r = RESUME_GUEST_NV;
  70                 break;
  71         case EMULATE_DO_MMIO:
  72                 run->exit_reason = KVM_EXIT_MMIO;
  73                 /* We must reload nonvolatiles because "update" load/store
  74                  * instructions modify register state. */
  75                 /* Future optimization: only reload non-volatiles if they were
  76                  * actually modified. */
  77                 r = RESUME_HOST_NV;
  78                 break;
  79         case EMULATE_FAIL:
  80                 /* XXX Deliver Program interrupt to guest. */
  81                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
  82                        vcpu->arch.last_inst);
  83                 r = RESUME_HOST;
  84                 break;
  85         default:
  86                 BUG();
  87         }
  88
  89         return r;
  90 }
  91
  92 void kvm_arch_hardware_enable(void *garbage)
  93 {
  94 }
  95
  96 void kvm_arch_hardware_disable(void *garbage)
  97 {
  98 }
  99
 100 int kvm_arch_hardware_setup(void)
 101 {
 102         return 0;
 103 }
 104
 105 void kvm_arch_hardware_unsetup(void)
 106 {
 107 }
 108
 109 void kvm_arch_check_processor_compat(void *rtn)
 110 {
 111         *(int *)rtn = kvmppc_core_check_processor_compat();
 112 }
 113
 114 struct kvm *kvm_arch_create_vm(void)
 115 {
 116         struct kvm *kvm;
 117
 118         kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
 119         if (!kvm)
 120                 return ERR_PTR(-ENOMEM);
 121
 122         return kvm;
 123 }
 124
 125 static void kvmppc_free_vcpus(struct kvm *kvm)
 126 {
 127         unsigned int i;
 128         struct kvm_vcpu *vcpu;
 129
 130         kvm_for_each_vcpu(i, vcpu, kvm)
 131                 kvm_arch_vcpu_free(vcpu);
 132
 133         mutex_lock(&kvm->lock);
 134         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
 135                 kvm->vcpus[i] = NULL;
 136
 137         atomic_set(&kvm->online_vcpus, 0);
 138         mutex_unlock(&kvm->lock);
 139 }
 140
 141 void kvm_arch_sync_events(struct kvm *kvm)
 142 {
 143 }
 144
 145 void kvm_arch_destroy_vm(struct kvm *kvm)
 146 {
 147         kvmppc_free_vcpus(kvm);
 148         kvm_free_physmem(kvm);
 149         kfree(kvm);
 150 }
 151
 152 int kvm_dev_ioctl_check_extension(long ext)
 153 {
 154         int r;
 155
 156         switch (ext) {
 157         case KVM_CAP_COALESCED_MMIO:
 158                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 159                 break;
 160         default:
 161                 r = 0;
 162                 break;
 163         }
 164         return r;
 165
 166 }
 167
 168 long kvm_arch_dev_ioctl(struct file *filp,
 169                         unsigned int ioctl, unsigned long arg)
 170 {
 171         return -EINVAL;
 172 }
 173
 174 int kvm_arch_set_memory_region(struct kvm *kvm,
 175                                struct kvm_userspace_memory_region *mem,
 176                                struct kvm_memory_slot old,
 177                                int user_alloc)
 178 {
 179         return 0;
 180 }
 181
 182 void kvm_arch_flush_shadow(struct kvm *kvm)
 183 {
 184 }
 185
 186 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 187 {
 188         struct kvm_vcpu *vcpu;
 189         vcpu = kvmppc_core_vcpu_create(kvm, id);
 190         kvmppc_create_vcpu_debugfs(vcpu, id);
 191         return vcpu;
 192 }
 193
 194 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 195 {
 196         kvmppc_remove_vcpu_debugfs(vcpu);
 197         kvmppc_core_vcpu_free(vcpu);
 198 }
 199
 200 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 201 {
 202         kvm_arch_vcpu_free(vcpu);
 203 }
 204
 205 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 206 {
 207         return kvmppc_core_pending_dec(vcpu);
 208 }
 209
 210 static void kvmppc_decrementer_func(unsigned long data)
 211 {
 212         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 213
 214         kvmppc_core_queue_dec(vcpu);
 215
 216         if (waitqueue_active(&vcpu->wq)) {
 217                 wake_up_interruptible(&vcpu->wq);
 218                 vcpu->stat.halt_wakeup++;
 219         }
 220 }
 221
 222 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 223 {
 224         setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func,
 225                     (unsigned long)vcpu);
 226
 227         return 0;
 228 }
 229
 230 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 231 {
 232         kvmppc_mmu_destroy(vcpu);
 233 }
 234
 235 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 236 {
 237         kvmppc_core_vcpu_load(vcpu, cpu);
 238 }
 239
 240 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 241 {
 242         kvmppc_core_vcpu_put(vcpu);
 243 }
 244
 245 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 246                                         struct kvm_guest_debug *dbg)
 247 {
 248         return -EINVAL;
 249 }
 250
 251 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 252                                      struct kvm_run *run)
 253 {
 254         ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 255         *gpr = run->dcr.data;
 256 }
 257
 258 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 259                                       struct kvm_run *run)
 260 {
 261         ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 262
 263         if (run->mmio.len > sizeof(*gpr)) {
 264                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 265                 return;
 266         }
 267
 268         if (vcpu->arch.mmio_is_bigendian) {
 269                 switch (run->mmio.len) {
 270                 case 4: *gpr = *(u32 *)run->mmio.data; break;
 271                 case 2: *gpr = *(u16 *)run->mmio.data; break;
 272                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 273                 }
 274         } else {
 275                 /* Convert BE data from userland back to LE. */
 276                 switch (run->mmio.len) {
 277                 case 4: *gpr = ld_le32((u32 *)run->mmio.data); break;
 278                 case 2: *gpr = ld_le16((u16 *)run->mmio.data); break;
 279                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 280                 }
 281         }
 282 }
 283
 284 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 285                        unsigned int rt, unsigned int bytes, int is_bigendian)
 286 {
 287         if (bytes > sizeof(run->mmio.data)) {
 288                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 289                        run->mmio.len);
 290         }
 291
 292         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 293         run->mmio.len = bytes;
 294         run->mmio.is_write = 0;
 295
 296         vcpu->arch.io_gpr = rt;
 297         vcpu->arch.mmio_is_bigendian = is_bigendian;
 298         vcpu->mmio_needed = 1;
 299         vcpu->mmio_is_write = 0;
 300
 301         return EMULATE_DO_MMIO;
 302 }
 303
 304 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 305                         u32 val, unsigned int bytes, int is_bigendian)
 306 {
 307         void *data = run->mmio.data;
 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 = 1;
 317         vcpu->mmio_needed = 1;
 318         vcpu->mmio_is_write = 1;
 319
 320         /* Store the value at the lowest bytes in 'data'. */
 321         if (is_bigendian) {
 322                 switch (bytes) {
 323                 case 4: *(u32 *)data = val; break;
 324                 case 2: *(u16 *)data = val; break;
 325                 case 1: *(u8  *)data = val; break;
 326                 }
 327         } else {
 328                 /* Store LE value into 'data'. */
 329                 switch (bytes) {
 330                 case 4: st_le32(data, val); break;
 331                 case 2: st_le16(data, val); break;
 332                 case 1: *(u8 *)data = val; break;
 333                 }
 334         }
 335
 336         return EMULATE_DO_MMIO;
 337 }
 338
 339 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 340 {
 341         int r;
 342         sigset_t sigsaved;
 343
 344         vcpu_load(vcpu);
 345
 346         if (vcpu->sigset_active)
 347                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 348
 349         if (vcpu->mmio_needed) {
 350                 if (!vcpu->mmio_is_write)
 351                         kvmppc_complete_mmio_load(vcpu, run);
 352                 vcpu->mmio_needed = 0;
 353         } else if (vcpu->arch.dcr_needed) {
 354                 if (!vcpu->arch.dcr_is_write)
 355                         kvmppc_complete_dcr_load(vcpu, run);
 356                 vcpu->arch.dcr_needed = 0;
 357         }
 358
 359         kvmppc_core_deliver_interrupts(vcpu);
 360
 361         local_irq_disable();
 362         kvm_guest_enter();
 363         r = __kvmppc_vcpu_run(run, vcpu);
 364         kvm_guest_exit();
 365         local_irq_enable();
 366
 367         if (vcpu->sigset_active)
 368                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 369
 370         vcpu_put(vcpu);
 371
 372         return r;
 373 }
 374
 375 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 376 {
 377         kvmppc_core_queue_external(vcpu, irq);
 378
 379         if (waitqueue_active(&vcpu->wq)) {
 380                 wake_up_interruptible(&vcpu->wq);
 381                 vcpu->stat.halt_wakeup++;
 382         }
 383
 384         return 0;
 385 }
 386
 387 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 388                                     struct kvm_mp_state *mp_state)
 389 {
 390         return -EINVAL;
 391 }
 392
 393 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 394                                     struct kvm_mp_state *mp_state)
 395 {
 396         return -EINVAL;
 397 }
 398
 399 long kvm_arch_vcpu_ioctl(struct file *filp,
 400                          unsigned int ioctl, unsigned long arg)
 401 {
 402         struct kvm_vcpu *vcpu = filp->private_data;
 403         void __user *argp = (void __user *)arg;
 404         long r;
 405
 406         switch (ioctl) {
 407         case KVM_INTERRUPT: {
 408                 struct kvm_interrupt irq;
 409                 r = -EFAULT;
 410                 if (copy_from_user(&irq, argp, sizeof(irq)))
 411                         goto out;
 412                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 413                 break;
 414         }
 415         default:
 416                 r = -EINVAL;
 417         }
 418
 419 out:
 420         return r;
 421 }
 422
 423 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 424 {
 425         return -ENOTSUPP;
 426 }
 427
 428 long kvm_arch_vm_ioctl(struct file *filp,
 429                        unsigned int ioctl, unsigned long arg)
 430 {
 431         long r;
 432
 433         switch (ioctl) {
 434         default:
 435                 r = -EINVAL;
 436         }
 437
 438         return r;
 439 }
 440
 441 int kvm_arch_init(void *opaque)
 442 {
 443         return 0;
 444 }
 445
 446 void kvm_arch_exit(void)
 447 {
 448 }