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_arch_vcpu_runnable(struct kvm_vcpu *v)
  43 {
  44         return !(v->arch.msr & MSR_WE) || !!(v->arch.pending_exceptions);
  45 }
  46
  47
  48 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
  49 {
  50         enum emulation_result er;
  51         int r;
  52
  53         er = kvmppc_emulate_instruction(run, vcpu);
  54         switch (er) {
  55         case EMULATE_DONE:
  56                 /* Future optimization: only reload non-volatiles if they were
  57                  * actually modified. */
  58                 r = RESUME_GUEST_NV;
  59                 break;
  60         case EMULATE_DO_MMIO:
  61                 run->exit_reason = KVM_EXIT_MMIO;
  62                 /* We must reload nonvolatiles because "update" load/store
  63                  * instructions modify register state. */
  64                 /* Future optimization: only reload non-volatiles if they were
  65                  * actually modified. */
  66                 r = RESUME_HOST_NV;
  67                 break;
  68         case EMULATE_FAIL:
  69                 /* XXX Deliver Program interrupt to guest. */
  70                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
  71                        vcpu->arch.last_inst);
  72                 r = RESUME_HOST;
  73                 break;
  74         default:
  75                 BUG();
  76         }
  77
  78         return r;
  79 }
  80
  81 int kvm_arch_hardware_enable(void *garbage)
  82 {
  83         return 0;
  84 }
  85
  86 void kvm_arch_hardware_disable(void *garbage)
  87 {
  88 }
  89
  90 int kvm_arch_hardware_setup(void)
  91 {
  92         return 0;
  93 }
  94
  95 void kvm_arch_hardware_unsetup(void)
  96 {
  97 }
  98
  99 void kvm_arch_check_processor_compat(void *rtn)
 100 {
 101         *(int *)rtn = kvmppc_core_check_processor_compat();
 102 }
 103
 104 struct kvm *kvm_arch_create_vm(void)
 105 {
 106         struct kvm *kvm;
 107
 108         kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
 109         if (!kvm)
 110                 return ERR_PTR(-ENOMEM);
 111
 112         return kvm;
 113 }
 114
 115 static void kvmppc_free_vcpus(struct kvm *kvm)
 116 {
 117         unsigned int i;
 118         struct kvm_vcpu *vcpu;
 119
 120         kvm_for_each_vcpu(i, vcpu, kvm)
 121                 kvm_arch_vcpu_free(vcpu);
 122
 123         mutex_lock(&kvm->lock);
 124         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
 125                 kvm->vcpus[i] = NULL;
 126
 127         atomic_set(&kvm->online_vcpus, 0);
 128         mutex_unlock(&kvm->lock);
 129 }
 130
 131 void kvm_arch_sync_events(struct kvm *kvm)
 132 {
 133 }
 134
 135 void kvm_arch_destroy_vm(struct kvm *kvm)
 136 {
 137         kvmppc_free_vcpus(kvm);
 138         kvm_free_physmem(kvm);
 139         kfree(kvm);
 140 }
 141
 142 int kvm_dev_ioctl_check_extension(long ext)
 143 {
 144         int r;
 145
 146         switch (ext) {
 147         case KVM_CAP_COALESCED_MMIO:
 148                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 149                 break;
 150         default:
 151                 r = 0;
 152                 break;
 153         }
 154         return r;
 155
 156 }
 157
 158 long kvm_arch_dev_ioctl(struct file *filp,
 159                         unsigned int ioctl, unsigned long arg)
 160 {
 161         return -EINVAL;
 162 }
 163
 164 int kvm_arch_set_memory_region(struct kvm *kvm,
 165                                struct kvm_userspace_memory_region *mem,
 166                                struct kvm_memory_slot old,
 167                                int user_alloc)
 168 {
 169         return 0;
 170 }
 171
 172 void kvm_arch_flush_shadow(struct kvm *kvm)
 173 {
 174 }
 175
 176 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 177 {
 178         struct kvm_vcpu *vcpu;
 179         vcpu = kvmppc_core_vcpu_create(kvm, id);
 180         kvmppc_create_vcpu_debugfs(vcpu, id);
 181         return vcpu;
 182 }
 183
 184 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 185 {
 186         kvmppc_remove_vcpu_debugfs(vcpu);
 187         kvmppc_core_vcpu_free(vcpu);
 188 }
 189
 190 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 191 {
 192         kvm_arch_vcpu_free(vcpu);
 193 }
 194
 195 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 196 {
 197         return kvmppc_core_pending_dec(vcpu);
 198 }
 199
 200 static void kvmppc_decrementer_func(unsigned long data)
 201 {
 202         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 203
 204         kvmppc_core_queue_dec(vcpu);
 205
 206         if (waitqueue_active(&vcpu->wq)) {
 207                 wake_up_interruptible(&vcpu->wq);
 208                 vcpu->stat.halt_wakeup++;
 209         }
 210 }
 211
 212 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 213 {
 214         setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func,
 215                     (unsigned long)vcpu);
 216
 217         return 0;
 218 }
 219
 220 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 221 {
 222         kvmppc_mmu_destroy(vcpu);
 223 }
 224
 225 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 226 {
 227         kvmppc_core_vcpu_load(vcpu, cpu);
 228 }
 229
 230 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 231 {
 232         kvmppc_core_vcpu_put(vcpu);
 233 }
 234
 235 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 236                                         struct kvm_guest_debug *dbg)
 237 {
 238         return -EINVAL;
 239 }
 240
 241 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 242                                      struct kvm_run *run)
 243 {
 244         ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 245         *gpr = run->dcr.data;
 246 }
 247
 248 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 249                                       struct kvm_run *run)
 250 {
 251         ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 252
 253         if (run->mmio.len > sizeof(*gpr)) {
 254                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 255                 return;
 256         }
 257
 258         if (vcpu->arch.mmio_is_bigendian) {
 259                 switch (run->mmio.len) {
 260                 case 4: *gpr = *(u32 *)run->mmio.data; break;
 261                 case 2: *gpr = *(u16 *)run->mmio.data; break;
 262                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 263                 }
 264         } else {
 265                 /* Convert BE data from userland back to LE. */
 266                 switch (run->mmio.len) {
 267                 case 4: *gpr = ld_le32((u32 *)run->mmio.data); break;
 268                 case 2: *gpr = ld_le16((u16 *)run->mmio.data); break;
 269                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 270                 }
 271         }
 272 }
 273
 274 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 275                        unsigned int rt, unsigned int bytes, int is_bigendian)
 276 {
 277         if (bytes > sizeof(run->mmio.data)) {
 278                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 279                        run->mmio.len);
 280         }
 281
 282         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 283         run->mmio.len = bytes;
 284         run->mmio.is_write = 0;
 285
 286         vcpu->arch.io_gpr = rt;
 287         vcpu->arch.mmio_is_bigendian = is_bigendian;
 288         vcpu->mmio_needed = 1;
 289         vcpu->mmio_is_write = 0;
 290
 291         return EMULATE_DO_MMIO;
 292 }
 293
 294 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 295                         u32 val, unsigned int bytes, int is_bigendian)
 296 {
 297         void *data = run->mmio.data;
 298
 299         if (bytes > sizeof(run->mmio.data)) {
 300                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 301                        run->mmio.len);
 302         }
 303
 304         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 305         run->mmio.len = bytes;
 306         run->mmio.is_write = 1;
 307         vcpu->mmio_needed = 1;
 308         vcpu->mmio_is_write = 1;
 309
 310         /* Store the value at the lowest bytes in 'data'. */
 311         if (is_bigendian) {
 312                 switch (bytes) {
 313                 case 4: *(u32 *)data = val; break;
 314                 case 2: *(u16 *)data = val; break;
 315                 case 1: *(u8  *)data = val; break;
 316                 }
 317         } else {
 318                 /* Store LE value into 'data'. */
 319                 switch (bytes) {
 320                 case 4: st_le32(data, val); break;
 321                 case 2: st_le16(data, val); break;
 322                 case 1: *(u8 *)data = val; break;
 323                 }
 324         }
 325
 326         return EMULATE_DO_MMIO;
 327 }
 328
 329 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 330 {
 331         int r;
 332         sigset_t sigsaved;
 333
 334         vcpu_load(vcpu);
 335
 336         if (vcpu->sigset_active)
 337                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 338
 339         if (vcpu->mmio_needed) {
 340                 if (!vcpu->mmio_is_write)
 341                         kvmppc_complete_mmio_load(vcpu, run);
 342                 vcpu->mmio_needed = 0;
 343         } else if (vcpu->arch.dcr_needed) {
 344                 if (!vcpu->arch.dcr_is_write)
 345                         kvmppc_complete_dcr_load(vcpu, run);
 346                 vcpu->arch.dcr_needed = 0;
 347         }
 348
 349         kvmppc_core_deliver_interrupts(vcpu);
 350
 351         local_irq_disable();
 352         kvm_guest_enter();
 353         r = __kvmppc_vcpu_run(run, vcpu);
 354         kvm_guest_exit();
 355         local_irq_enable();
 356
 357         if (vcpu->sigset_active)
 358                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 359
 360         vcpu_put(vcpu);
 361
 362         return r;
 363 }
 364
 365 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 366 {
 367         kvmppc_core_queue_external(vcpu, irq);
 368
 369         if (waitqueue_active(&vcpu->wq)) {
 370                 wake_up_interruptible(&vcpu->wq);
 371                 vcpu->stat.halt_wakeup++;
 372         }
 373
 374         return 0;
 375 }
 376
 377 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 378                                     struct kvm_mp_state *mp_state)
 379 {
 380         return -EINVAL;
 381 }
 382
 383 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 384                                     struct kvm_mp_state *mp_state)
 385 {
 386         return -EINVAL;
 387 }
 388
 389 long kvm_arch_vcpu_ioctl(struct file *filp,
 390                          unsigned int ioctl, unsigned long arg)
 391 {
 392         struct kvm_vcpu *vcpu = filp->private_data;
 393         void __user *argp = (void __user *)arg;
 394         long r;
 395
 396         switch (ioctl) {
 397         case KVM_INTERRUPT: {
 398                 struct kvm_interrupt irq;
 399                 r = -EFAULT;
 400                 if (copy_from_user(&irq, argp, sizeof(irq)))
 401                         goto out;
 402                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 403                 break;
 404         }
 405         default:
 406                 r = -EINVAL;
 407         }
 408
 409 out:
 410         return r;
 411 }
 412
 413 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 414 {
 415         return -ENOTSUPP;
 416 }
 417
 418 long kvm_arch_vm_ioctl(struct file *filp,
 419                        unsigned int ioctl, unsigned long arg)
 420 {
 421         long r;
 422
 423         switch (ioctl) {
 424         default:
 425                 r = -ENOTTY;
 426         }
 427
 428         return r;
 429 }
 430
 431 int kvm_arch_init(void *opaque)
 432 {
 433         return 0;
 434 }
 435
 436 void kvm_arch_exit(void)
 437 {
 438 }