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         struct kvm_vcpu *vcpu;
 126
 127         kvm_for_each_vcpu(i, vcpu, kvm)
 128                 kvm_arch_vcpu_free(vcpu);
 129
 130         mutex_lock(&kvm->lock);
 131         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
 132                 kvm->vcpus[i] = NULL;
 133
 134         atomic_set(&kvm->online_vcpus, 0);
 135         mutex_unlock(&kvm->lock);
 136 }
 137
 138 void kvm_arch_sync_events(struct kvm *kvm)
 139 {
 140 }
 141
 142 void kvm_arch_destroy_vm(struct kvm *kvm)
 143 {
 144         kvmppc_free_vcpus(kvm);
 145         kvm_free_physmem(kvm);
 146         kfree(kvm);
 147 }
 148
 149 int kvm_dev_ioctl_check_extension(long ext)
 150 {
 151         int r;
 152
 153         switch (ext) {
 154         case KVM_CAP_COALESCED_MMIO:
 155                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 156                 break;
 157         default:
 158                 r = 0;
 159                 break;
 160         }
 161         return r;
 162
 163 }
 164
 165 long kvm_arch_dev_ioctl(struct file *filp,
 166                         unsigned int ioctl, unsigned long arg)
 167 {
 168         return -EINVAL;
 169 }
 170
 171 int kvm_arch_set_memory_region(struct kvm *kvm,
 172                                struct kvm_userspace_memory_region *mem,
 173                                struct kvm_memory_slot old,
 174                                int user_alloc)
 175 {
 176         return 0;
 177 }
 178
 179 void kvm_arch_flush_shadow(struct kvm *kvm)
 180 {
 181 }
 182
 183 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 184 {
 185         struct kvm_vcpu *vcpu;
 186         vcpu = kvmppc_core_vcpu_create(kvm, id);
 187         kvmppc_create_vcpu_debugfs(vcpu, id);
 188         return vcpu;
 189 }
 190
 191 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 192 {
 193         kvmppc_remove_vcpu_debugfs(vcpu);
 194         kvmppc_core_vcpu_free(vcpu);
 195 }
 196
 197 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 198 {
 199         kvm_arch_vcpu_free(vcpu);
 200 }
 201
 202 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 203 {
 204         return kvmppc_core_pending_dec(vcpu);
 205 }
 206
 207 static void kvmppc_decrementer_func(unsigned long data)
 208 {
 209         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 210
 211         kvmppc_core_queue_dec(vcpu);
 212
 213         if (waitqueue_active(&vcpu->wq)) {
 214                 wake_up_interruptible(&vcpu->wq);
 215                 vcpu->stat.halt_wakeup++;
 216         }
 217 }
 218
 219 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 220 {
 221         setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func,
 222                     (unsigned long)vcpu);
 223
 224         return 0;
 225 }
 226
 227 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 228 {
 229         kvmppc_mmu_destroy(vcpu);
 230 }
 231
 232 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 233 {
 234         kvmppc_core_vcpu_load(vcpu, cpu);
 235 }
 236
 237 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 238 {
 239         kvmppc_core_vcpu_put(vcpu);
 240 }
 241
 242 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 243                                         struct kvm_guest_debug *dbg)
 244 {
 245         return -EINVAL;
 246 }
 247
 248 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 249                                      struct kvm_run *run)
 250 {
 251         ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 252         *gpr = run->dcr.data;
 253 }
 254
 255 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 256                                       struct kvm_run *run)
 257 {
 258         ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 259
 260         if (run->mmio.len > sizeof(*gpr)) {
 261                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 262                 return;
 263         }
 264
 265         if (vcpu->arch.mmio_is_bigendian) {
 266                 switch (run->mmio.len) {
 267                 case 4: *gpr = *(u32 *)run->mmio.data; break;
 268                 case 2: *gpr = *(u16 *)run->mmio.data; break;
 269                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 270                 }
 271         } else {
 272                 /* Convert BE data from userland back to LE. */
 273                 switch (run->mmio.len) {
 274                 case 4: *gpr = ld_le32((u32 *)run->mmio.data); break;
 275                 case 2: *gpr = ld_le16((u16 *)run->mmio.data); break;
 276                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 277                 }
 278         }
 279 }
 280
 281 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 282                        unsigned int rt, unsigned int bytes, int is_bigendian)
 283 {
 284         if (bytes > sizeof(run->mmio.data)) {
 285                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 286                        run->mmio.len);
 287         }
 288
 289         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 290         run->mmio.len = bytes;
 291         run->mmio.is_write = 0;
 292
 293         vcpu->arch.io_gpr = rt;
 294         vcpu->arch.mmio_is_bigendian = is_bigendian;
 295         vcpu->mmio_needed = 1;
 296         vcpu->mmio_is_write = 0;
 297
 298         return EMULATE_DO_MMIO;
 299 }
 300
 301 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 302                         u32 val, unsigned int bytes, int is_bigendian)
 303 {
 304         void *data = run->mmio.data;
 305
 306         if (bytes > sizeof(run->mmio.data)) {
 307                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 308                        run->mmio.len);
 309         }
 310
 311         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 312         run->mmio.len = bytes;
 313         run->mmio.is_write = 1;
 314         vcpu->mmio_needed = 1;
 315         vcpu->mmio_is_write = 1;
 316
 317         /* Store the value at the lowest bytes in 'data'. */
 318         if (is_bigendian) {
 319                 switch (bytes) {
 320                 case 4: *(u32 *)data = val; break;
 321                 case 2: *(u16 *)data = val; break;
 322                 case 1: *(u8  *)data = val; break;
 323                 }
 324         } else {
 325                 /* Store LE value into 'data'. */
 326                 switch (bytes) {
 327                 case 4: st_le32(data, val); break;
 328                 case 2: st_le16(data, val); break;
 329                 case 1: *(u8 *)data = val; break;
 330                 }
 331         }
 332
 333         return EMULATE_DO_MMIO;
 334 }
 335
 336 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 337 {
 338         int r;
 339         sigset_t sigsaved;
 340
 341         vcpu_load(vcpu);
 342
 343         if (vcpu->sigset_active)
 344                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 345
 346         if (vcpu->mmio_needed) {
 347                 if (!vcpu->mmio_is_write)
 348                         kvmppc_complete_mmio_load(vcpu, run);
 349                 vcpu->mmio_needed = 0;
 350         } else if (vcpu->arch.dcr_needed) {
 351                 if (!vcpu->arch.dcr_is_write)
 352                         kvmppc_complete_dcr_load(vcpu, run);
 353                 vcpu->arch.dcr_needed = 0;
 354         }
 355
 356         kvmppc_core_deliver_interrupts(vcpu);
 357
 358         local_irq_disable();
 359         kvm_guest_enter();
 360         r = __kvmppc_vcpu_run(run, vcpu);
 361         kvm_guest_exit();
 362         local_irq_enable();
 363
 364         if (vcpu->sigset_active)
 365                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 366
 367         vcpu_put(vcpu);
 368
 369         return r;
 370 }
 371
 372 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 373 {
 374         kvmppc_core_queue_external(vcpu, irq);
 375
 376         if (waitqueue_active(&vcpu->wq)) {
 377                 wake_up_interruptible(&vcpu->wq);
 378                 vcpu->stat.halt_wakeup++;
 379         }
 380
 381         return 0;
 382 }
 383
 384 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 385                                     struct kvm_mp_state *mp_state)
 386 {
 387         return -EINVAL;
 388 }
 389
 390 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 391                                     struct kvm_mp_state *mp_state)
 392 {
 393         return -EINVAL;
 394 }
 395
 396 long kvm_arch_vcpu_ioctl(struct file *filp,
 397                          unsigned int ioctl, unsigned long arg)
 398 {
 399         struct kvm_vcpu *vcpu = filp->private_data;
 400         void __user *argp = (void __user *)arg;
 401         long r;
 402
 403         switch (ioctl) {
 404         case KVM_INTERRUPT: {
 405                 struct kvm_interrupt irq;
 406                 r = -EFAULT;
 407                 if (copy_from_user(&irq, argp, sizeof(irq)))
 408                         goto out;
 409                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 410                 break;
 411         }
 412         default:
 413                 r = -EINVAL;
 414         }
 415
 416 out:
 417         return r;
 418 }
 419
 420 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 421 {
 422         return -ENOTSUPP;
 423 }
 424
 425 long kvm_arch_vm_ioctl(struct file *filp,
 426                        unsigned int ioctl, unsigned long arg)
 427 {
 428         long r;
 429
 430         switch (ioctl) {
 431         default:
 432                 r = -EINVAL;
 433         }
 434
 435         return r;
 436 }
 437
 438 int kvm_arch_init(void *opaque)
 439 {
 440         return 0;
 441 }
 442
 443 void kvm_arch_exit(void)
 444 {
 445 }