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 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
  35 {
  36         return gfn;
  37 }
  38
  39 int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
  40 {
  41         return !!(v->arch.pending_exceptions);
  42 }
  43
  44 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu)
  45 {
  46         /* do real check here */
  47         return 1;
  48 }
  49
  50 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
  51 {
  52         return !(v->arch.msr & MSR_WE);
  53 }
  54
  55
  56 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
  57 {
  58         enum emulation_result er;
  59         int r;
  60
  61         er = kvmppc_emulate_instruction(run, vcpu);
  62         switch (er) {
  63         case EMULATE_DONE:
  64                 /* Future optimization: only reload non-volatiles if they were
  65                  * actually modified. */
  66                 r = RESUME_GUEST_NV;
  67                 break;
  68         case EMULATE_DO_MMIO:
  69                 run->exit_reason = KVM_EXIT_MMIO;
  70                 /* We must reload nonvolatiles because "update" load/store
  71                  * instructions modify register state. */
  72                 /* Future optimization: only reload non-volatiles if they were
  73                  * actually modified. */
  74                 r = RESUME_HOST_NV;
  75                 break;
  76         case EMULATE_FAIL:
  77                 /* XXX Deliver Program interrupt to guest. */
  78                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
  79                        vcpu->arch.last_inst);
  80                 r = RESUME_HOST;
  81                 break;
  82         default:
  83                 BUG();
  84         }
  85
  86         return r;
  87 }
  88
  89 void kvm_arch_hardware_enable(void *garbage)
  90 {
  91 }
  92
  93 void kvm_arch_hardware_disable(void *garbage)
  94 {
  95 }
  96
  97 int kvm_arch_hardware_setup(void)
  98 {
  99         return 0;
 100 }
 101
 102 void kvm_arch_hardware_unsetup(void)
 103 {
 104 }
 105
 106 void kvm_arch_check_processor_compat(void *rtn)
 107 {
 108         *(int *)rtn = kvmppc_core_check_processor_compat();
 109 }
 110
 111 struct kvm *kvm_arch_create_vm(void)
 112 {
 113         struct kvm *kvm;
 114
 115         kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
 116         if (!kvm)
 117                 return ERR_PTR(-ENOMEM);
 118
 119         return kvm;
 120 }
 121
 122 static void kvmppc_free_vcpus(struct kvm *kvm)
 123 {
 124         unsigned int i;
 125
 126         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 127                 if (kvm->vcpus[i]) {
 128                         kvm_arch_vcpu_free(kvm->vcpus[i]);
 129                         kvm->vcpus[i] = NULL;
 130                 }
 131         }
 132 }
 133
 134 void kvm_arch_sync_events(struct kvm *kvm)
 135 {
 136 }
 137
 138 void kvm_arch_destroy_vm(struct kvm *kvm)
 139 {
 140         kvmppc_free_vcpus(kvm);
 141         kvm_free_physmem(kvm);
 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_COALESCED_MMIO:
 151                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 152                 break;
 153         default:
 154                 r = 0;
 155                 break;
 156         }
 157         return r;
 158
 159 }
 160
 161 long kvm_arch_dev_ioctl(struct file *filp,
 162                         unsigned int ioctl, unsigned long arg)
 163 {
 164         return -EINVAL;
 165 }
 166
 167 int kvm_arch_set_memory_region(struct kvm *kvm,
 168                                struct kvm_userspace_memory_region *mem,
 169                                struct kvm_memory_slot old,
 170                                int user_alloc)
 171 {
 172         return 0;
 173 }
 174
 175 void kvm_arch_flush_shadow(struct kvm *kvm)
 176 {
 177 }
 178
 179 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 180 {
 181         struct kvm_vcpu *vcpu;
 182         vcpu = kvmppc_core_vcpu_create(kvm, id);
 183         kvmppc_create_vcpu_debugfs(vcpu, id);
 184         return vcpu;
 185 }
 186
 187 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 188 {
 189         kvmppc_remove_vcpu_debugfs(vcpu);
 190         kvmppc_core_vcpu_free(vcpu);
 191 }
 192
 193 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 194 {
 195         kvm_arch_vcpu_free(vcpu);
 196 }
 197
 198 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 199 {
 200         return kvmppc_core_pending_dec(vcpu);
 201 }
 202
 203 static void kvmppc_decrementer_func(unsigned long data)
 204 {
 205         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 206
 207         kvmppc_core_queue_dec(vcpu);
 208
 209         if (waitqueue_active(&vcpu->wq)) {
 210                 wake_up_interruptible(&vcpu->wq);
 211                 vcpu->stat.halt_wakeup++;
 212         }
 213 }
 214
 215 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 216 {
 217         setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func,
 218                     (unsigned long)vcpu);
 219
 220         return 0;
 221 }
 222
 223 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 224 {
 225         kvmppc_mmu_destroy(vcpu);
 226 }
 227
 228 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 229 {
 230         kvmppc_core_vcpu_load(vcpu, cpu);
 231 }
 232
 233 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 234 {
 235         kvmppc_core_vcpu_put(vcpu);
 236 }
 237
 238 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 239                                         struct kvm_guest_debug *dbg)
 240 {
 241         return -EINVAL;
 242 }
 243
 244 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 245                                      struct kvm_run *run)
 246 {
 247         ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 248         *gpr = run->dcr.data;
 249 }
 250
 251 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 252                                       struct kvm_run *run)
 253 {
 254         ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 255
 256         if (run->mmio.len > sizeof(*gpr)) {
 257                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 258                 return;
 259         }
 260
 261         if (vcpu->arch.mmio_is_bigendian) {
 262                 switch (run->mmio.len) {
 263                 case 4: *gpr = *(u32 *)run->mmio.data; break;
 264                 case 2: *gpr = *(u16 *)run->mmio.data; break;
 265                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 266                 }
 267         } else {
 268                 /* Convert BE data from userland back to LE. */
 269                 switch (run->mmio.len) {
 270                 case 4: *gpr = ld_le32((u32 *)run->mmio.data); break;
 271                 case 2: *gpr = ld_le16((u16 *)run->mmio.data); break;
 272                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 273                 }
 274         }
 275 }
 276
 277 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 278                        unsigned int rt, unsigned int bytes, int is_bigendian)
 279 {
 280         if (bytes > sizeof(run->mmio.data)) {
 281                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 282                        run->mmio.len);
 283         }
 284
 285         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 286         run->mmio.len = bytes;
 287         run->mmio.is_write = 0;
 288
 289         vcpu->arch.io_gpr = rt;
 290         vcpu->arch.mmio_is_bigendian = is_bigendian;
 291         vcpu->mmio_needed = 1;
 292         vcpu->mmio_is_write = 0;
 293
 294         return EMULATE_DO_MMIO;
 295 }
 296
 297 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 298                         u32 val, unsigned int bytes, int is_bigendian)
 299 {
 300         void *data = run->mmio.data;
 301
 302         if (bytes > sizeof(run->mmio.data)) {
 303                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 304                        run->mmio.len);
 305         }
 306
 307         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 308         run->mmio.len = bytes;
 309         run->mmio.is_write = 1;
 310         vcpu->mmio_needed = 1;
 311         vcpu->mmio_is_write = 1;
 312
 313         /* Store the value at the lowest bytes in 'data'. */
 314         if (is_bigendian) {
 315                 switch (bytes) {
 316                 case 4: *(u32 *)data = val; break;
 317                 case 2: *(u16 *)data = val; break;
 318                 case 1: *(u8  *)data = val; break;
 319                 }
 320         } else {
 321                 /* Store LE value into 'data'. */
 322                 switch (bytes) {
 323                 case 4: st_le32(data, val); break;
 324                 case 2: st_le16(data, val); break;
 325                 case 1: *(u8 *)data = val; break;
 326                 }
 327         }
 328
 329         return EMULATE_DO_MMIO;
 330 }
 331
 332 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 333 {
 334         int r;
 335         sigset_t sigsaved;
 336
 337         vcpu_load(vcpu);
 338
 339         if (vcpu->sigset_active)
 340                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 341
 342         if (vcpu->mmio_needed) {
 343                 if (!vcpu->mmio_is_write)
 344                         kvmppc_complete_mmio_load(vcpu, run);
 345                 vcpu->mmio_needed = 0;
 346         } else if (vcpu->arch.dcr_needed) {
 347                 if (!vcpu->arch.dcr_is_write)
 348                         kvmppc_complete_dcr_load(vcpu, run);
 349                 vcpu->arch.dcr_needed = 0;
 350         }
 351
 352         kvmppc_core_deliver_interrupts(vcpu);
 353
 354         local_irq_disable();
 355         kvm_guest_enter();
 356         r = __kvmppc_vcpu_run(run, vcpu);
 357         kvm_guest_exit();
 358         local_irq_enable();
 359
 360         if (vcpu->sigset_active)
 361                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 362
 363         vcpu_put(vcpu);
 364
 365         return r;
 366 }
 367
 368 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 369 {
 370         kvmppc_core_queue_external(vcpu, irq);
 371
 372         if (waitqueue_active(&vcpu->wq)) {
 373                 wake_up_interruptible(&vcpu->wq);
 374                 vcpu->stat.halt_wakeup++;
 375         }
 376
 377         return 0;
 378 }
 379
 380 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 381                                     struct kvm_mp_state *mp_state)
 382 {
 383         return -EINVAL;
 384 }
 385
 386 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 387                                     struct kvm_mp_state *mp_state)
 388 {
 389         return -EINVAL;
 390 }
 391
 392 long kvm_arch_vcpu_ioctl(struct file *filp,
 393                          unsigned int ioctl, unsigned long arg)
 394 {
 395         struct kvm_vcpu *vcpu = filp->private_data;
 396         void __user *argp = (void __user *)arg;
 397         long r;
 398
 399         switch (ioctl) {
 400         case KVM_INTERRUPT: {
 401                 struct kvm_interrupt irq;
 402                 r = -EFAULT;
 403                 if (copy_from_user(&irq, argp, sizeof(irq)))
 404                         goto out;
 405                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 406                 break;
 407         }
 408         default:
 409                 r = -EINVAL;
 410         }
 411
 412 out:
 413         return r;
 414 }
 415
 416 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 417 {
 418         return -ENOTSUPP;
 419 }
 420
 421 long kvm_arch_vm_ioctl(struct file *filp,
 422                        unsigned int ioctl, unsigned long arg)
 423 {
 424         long r;
 425
 426         switch (ioctl) {
 427         default:
 428                 r = -EINVAL;
 429         }
 430
 431         return r;
 432 }
 433
 434 int kvm_arch_init(void *opaque)
 435 {
 436         return 0;
 437 }
 438
 439 void kvm_arch_exit(void)
 440 {
 441 }