target-ppc/kvm.c

   1 /*
   2  * PowerPC implementation of KVM hooks
   3  *
   4  * Copyright IBM Corp. 2007
   5  *
   6  * Authors:
   7  *  Jerone Young <jyoung5@us.ibm.com>
   8  *  Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
   9  *  Hollis Blanchard <hollisb@us.ibm.com>
  10  *
  11  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  12  * See the COPYING file in the top-level directory.
  13  *
  14  */
  15
  16 #include <sys/types.h>
  17 #include <sys/ioctl.h>
  18 #include <sys/mman.h>
  19
  20 #include <linux/kvm.h>
  21
  22 #include "qemu-common.h"
  23 #include "qemu-timer.h"
  24 #include "sysemu.h"
  25 #include "kvm.h"
  26 #include "kvm_ppc.h"
  27 #include "cpu.h"
  28 #include "device_tree.h"
  29
  30 //#define DEBUG_KVM
  31
  32 #ifdef DEBUG_KVM
  33 #define dprintf(fmt, ...) \
  34     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  35 #else
  36 #define dprintf(fmt, ...) \
  37     do { } while (0)
  38 #endif
  39
  40 const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
  41     KVM_CAP_LAST_INFO
  42 };
  43
  44 static int cap_interrupt_unset = false;
  45 static int cap_interrupt_level = false;
  46
  47 /* XXX We have a race condition where we actually have a level triggered
  48  *     interrupt, but the infrastructure can't expose that yet, so the guest
  49  *     takes but ignores it, goes to sleep and never gets notified that there's
  50  *     still an interrupt pending.
  51  *
  52  *     As a quick workaround, let's just wake up again 20 ms after we injected
  53  *     an interrupt. That way we can assure that we're always reinjecting
  54  *     interrupts in case the guest swallowed them.
  55  */
  56 static QEMUTimer *idle_timer;
  57
  58 static void kvm_kick_env(void *env)
  59 {
  60     qemu_cpu_kick(env);
  61 }
  62
  63 int kvm_arch_init(KVMState *s)
  64 {
  65 #ifdef KVM_CAP_PPC_UNSET_IRQ
  66     cap_interrupt_unset = kvm_check_extension(s, KVM_CAP_PPC_UNSET_IRQ);
  67 #endif
  68 #ifdef KVM_CAP_PPC_IRQ_LEVEL
  69     cap_interrupt_level = kvm_check_extension(s, KVM_CAP_PPC_IRQ_LEVEL);
  70 #endif
  71
  72     if (!cap_interrupt_level) {
  73         fprintf(stderr, "KVM: Couldn't find level irq capability. Expect the "
  74                         "VM to stall at times!\n");
  75     }
  76
  77     return 0;
  78 }
  79
  80 int kvm_arch_init_vcpu(CPUState *cenv)
  81 {
  82     int ret = 0;
  83     struct kvm_sregs sregs;
  84
  85     sregs.pvr = cenv->spr[SPR_PVR];
  86     ret = kvm_vcpu_ioctl(cenv, KVM_SET_SREGS, &sregs);
  87
  88     idle_timer = qemu_new_timer(vm_clock, kvm_kick_env, cenv);
  89
  90     return ret;
  91 }
  92
  93 void kvm_arch_reset_vcpu(CPUState *env)
  94 {
  95 }
  96
  97 int kvm_arch_put_registers(CPUState *env, int level)
  98 {
  99     struct kvm_regs regs;
 100     int ret;
 101     int i;
 102
 103     ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
 104     if (ret < 0)
 105         return ret;
 106
 107     regs.ctr = env->ctr;
 108     regs.lr  = env->lr;
 109     regs.xer = env->xer;
 110     regs.msr = env->msr;
 111     regs.pc = env->nip;
 112
 113     regs.srr0 = env->spr[SPR_SRR0];
 114     regs.srr1 = env->spr[SPR_SRR1];
 115
 116     regs.sprg0 = env->spr[SPR_SPRG0];
 117     regs.sprg1 = env->spr[SPR_SPRG1];
 118     regs.sprg2 = env->spr[SPR_SPRG2];
 119     regs.sprg3 = env->spr[SPR_SPRG3];
 120     regs.sprg4 = env->spr[SPR_SPRG4];
 121     regs.sprg5 = env->spr[SPR_SPRG5];
 122     regs.sprg6 = env->spr[SPR_SPRG6];
 123     regs.sprg7 = env->spr[SPR_SPRG7];
 124
 125     for (i = 0;i < 32; i++)
 126         regs.gpr[i] = env->gpr[i];
 127
 128     ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, &regs);
 129     if (ret < 0)
 130         return ret;
 131
 132     return ret;
 133 }
 134
 135 int kvm_arch_get_registers(CPUState *env)
 136 {
 137     struct kvm_regs regs;
 138     struct kvm_sregs sregs;
 139     int i, ret;
 140
 141     ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
 142     if (ret < 0)
 143         return ret;
 144
 145     ret = kvm_vcpu_ioctl(env, KVM_GET_SREGS, &sregs);
 146     if (ret < 0)
 147         return ret;
 148
 149     env->ctr = regs.ctr;
 150     env->lr = regs.lr;
 151     env->xer = regs.xer;
 152     env->msr = regs.msr;
 153     env->nip = regs.pc;
 154
 155     env->spr[SPR_SRR0] = regs.srr0;
 156     env->spr[SPR_SRR1] = regs.srr1;
 157
 158     env->spr[SPR_SPRG0] = regs.sprg0;
 159     env->spr[SPR_SPRG1] = regs.sprg1;
 160     env->spr[SPR_SPRG2] = regs.sprg2;
 161     env->spr[SPR_SPRG3] = regs.sprg3;
 162     env->spr[SPR_SPRG4] = regs.sprg4;
 163     env->spr[SPR_SPRG5] = regs.sprg5;
 164     env->spr[SPR_SPRG6] = regs.sprg6;
 165     env->spr[SPR_SPRG7] = regs.sprg7;
 166
 167     for (i = 0;i < 32; i++)
 168         env->gpr[i] = regs.gpr[i];
 169
 170 #ifdef KVM_CAP_PPC_SEGSTATE
 171     if (kvm_check_extension(env->kvm_state, KVM_CAP_PPC_SEGSTATE)) {
 172         env->sdr1 = sregs.u.s.sdr1;
 173
 174         /* Sync SLB */
 175 #ifdef TARGET_PPC64
 176         for (i = 0; i < 64; i++) {
 177             ppc_store_slb(env, sregs.u.s.ppc64.slb[i].slbe,
 178                                sregs.u.s.ppc64.slb[i].slbv);
 179         }
 180 #endif
 181
 182         /* Sync SRs */
 183         for (i = 0; i < 16; i++) {
 184             env->sr[i] = sregs.u.s.ppc32.sr[i];
 185         }
 186
 187         /* Sync BATs */
 188         for (i = 0; i < 8; i++) {
 189             env->DBAT[0][i] = sregs.u.s.ppc32.dbat[i] & 0xffffffff;
 190             env->DBAT[1][i] = sregs.u.s.ppc32.dbat[i] >> 32;
 191             env->IBAT[0][i] = sregs.u.s.ppc32.ibat[i] & 0xffffffff;
 192             env->IBAT[1][i] = sregs.u.s.ppc32.ibat[i] >> 32;
 193         }
 194     }
 195 #endif
 196
 197     return 0;
 198 }
 199
 200 int kvmppc_set_interrupt(CPUState *env, int irq, int level)
 201 {
 202     unsigned virq = level ? KVM_INTERRUPT_SET_LEVEL : KVM_INTERRUPT_UNSET;
 203
 204     if (irq != PPC_INTERRUPT_EXT) {
 205         return 0;
 206     }
 207
 208     if (!kvm_enabled() || !cap_interrupt_unset || !cap_interrupt_level) {
 209         return 0;
 210     }
 211
 212     kvm_vcpu_ioctl(env, KVM_INTERRUPT, &virq);
 213
 214     return 0;
 215 }
 216
 217 #if defined(TARGET_PPCEMB)
 218 #define PPC_INPUT_INT PPC40x_INPUT_INT
 219 #elif defined(TARGET_PPC64)
 220 #define PPC_INPUT_INT PPC970_INPUT_INT
 221 #else
 222 #define PPC_INPUT_INT PPC6xx_INPUT_INT
 223 #endif
 224
 225 int kvm_arch_pre_run(CPUState *env, struct kvm_run *run)
 226 {
 227     int r;
 228     unsigned irq;
 229
 230     /* PowerPC Qemu tracks the various core input pins (interrupt, critical
 231      * interrupt, reset, etc) in PPC-specific env->irq_input_state. */
 232     if (!cap_interrupt_level &&
 233         run->ready_for_interrupt_injection &&
 234         (env->interrupt_request & CPU_INTERRUPT_HARD) &&
 235         (env->irq_input_state & (1<<PPC_INPUT_INT)))
 236     {
 237         /* For now KVM disregards the 'irq' argument. However, in the
 238          * future KVM could cache it in-kernel to avoid a heavyweight exit
 239          * when reading the UIC.
 240          */
 241         irq = KVM_INTERRUPT_SET;
 242
 243         dprintf("injected interrupt %d\n", irq);
 244         r = kvm_vcpu_ioctl(env, KVM_INTERRUPT, &irq);
 245         if (r < 0)
 246             printf("cpu %d fail inject %x\n", env->cpu_index, irq);
 247
 248         /* Always wake up soon in case the interrupt was level based */
 249         qemu_mod_timer(idle_timer, qemu_get_clock(vm_clock) +
 250                        (get_ticks_per_sec() / 50));
 251     }
 252
 253     /* We don't know if there are more interrupts pending after this. However,
 254      * the guest will return to userspace in the course of handling this one
 255      * anyways, so we will get a chance to deliver the rest. */
 256     return 0;
 257 }
 258
 259 int kvm_arch_post_run(CPUState *env, struct kvm_run *run)
 260 {
 261     return 0;
 262 }
 263
 264 int kvm_arch_process_irqchip_events(CPUState *env)
 265 {
 266     return 0;
 267 }
 268
 269 static int kvmppc_handle_halt(CPUState *env)
 270 {
 271     if (!(env->interrupt_request & CPU_INTERRUPT_HARD) && (msr_ee)) {
 272         env->halted = 1;
 273         env->exception_index = EXCP_HLT;
 274     }
 275
 276     return 1;
 277 }
 278
 279 /* map dcr access to existing qemu dcr emulation */
 280 static int kvmppc_handle_dcr_read(CPUState *env, uint32_t dcrn, uint32_t *data)
 281 {
 282     if (ppc_dcr_read(env->dcr_env, dcrn, data) < 0)
 283         fprintf(stderr, "Read to unhandled DCR (0x%x)\n", dcrn);
 284
 285     return 1;
 286 }
 287
 288 static int kvmppc_handle_dcr_write(CPUState *env, uint32_t dcrn, uint32_t data)
 289 {
 290     if (ppc_dcr_write(env->dcr_env, dcrn, data) < 0)
 291         fprintf(stderr, "Write to unhandled DCR (0x%x)\n", dcrn);
 292
 293     return 1;
 294 }
 295
 296 int kvm_arch_handle_exit(CPUState *env, struct kvm_run *run)
 297 {
 298     int ret = 0;
 299
 300     switch (run->exit_reason) {
 301     case KVM_EXIT_DCR:
 302         if (run->dcr.is_write) {
 303             dprintf("handle dcr write\n");
 304             ret = kvmppc_handle_dcr_write(env, run->dcr.dcrn, run->dcr.data);
 305         } else {
 306             dprintf("handle dcr read\n");
 307             ret = kvmppc_handle_dcr_read(env, run->dcr.dcrn, &run->dcr.data);
 308         }
 309         break;
 310     case KVM_EXIT_HLT:
 311         dprintf("handle halt\n");
 312         ret = kvmppc_handle_halt(env);
 313         break;
 314     default:
 315         fprintf(stderr, "KVM: unknown exit reason %d\n", run->exit_reason);
 316         ret = -1;
 317         break;
 318     }
 319
 320     return ret;
 321 }
 322
 323 static int read_cpuinfo(const char *field, char *value, int len)
 324 {
 325     FILE *f;
 326     int ret = -1;
 327     int field_len = strlen(field);
 328     char line[512];
 329
 330     f = fopen("/proc/cpuinfo", "r");
 331     if (!f) {
 332         return -1;
 333     }
 334
 335     do {
 336         if(!fgets(line, sizeof(line), f)) {
 337             break;
 338         }
 339         if (!strncmp(line, field, field_len)) {
 340             strncpy(value, line, len);
 341             ret = 0;
 342             break;
 343         }
 344     } while(*line);
 345
 346     fclose(f);
 347
 348     return ret;
 349 }
 350
 351 uint32_t kvmppc_get_tbfreq(void)
 352 {
 353     char line[512];
 354     char *ns;
 355     uint32_t retval = get_ticks_per_sec();
 356
 357     if (read_cpuinfo("timebase", line, sizeof(line))) {
 358         return retval;
 359     }
 360
 361     if (!(ns = strchr(line, ':'))) {
 362         return retval;
 363     }
 364
 365     ns++;
 366
 367     retval = atoi(ns);
 368     return retval;
 369 }
 370
 371 int kvmppc_get_hypercall(CPUState *env, uint8_t *buf, int buf_len)
 372 {
 373     uint32_t *hc = (uint32_t*)buf;
 374
 375 #ifdef KVM_CAP_PPC_GET_PVINFO
 376     struct kvm_ppc_pvinfo pvinfo;
 377
 378     if (kvm_check_extension(env->kvm_state, KVM_CAP_PPC_GET_PVINFO) &&
 379         !kvm_vm_ioctl(env->kvm_state, KVM_PPC_GET_PVINFO, &pvinfo)) {
 380         memcpy(buf, pvinfo.hcall, buf_len);
 381
 382         return 0;
 383     }
 384 #endif
 385
 386     /*
 387      * Fallback to always fail hypercalls:
 388      *
 389      *     li r3, -1
 390      *     nop
 391      *     nop
 392      *     nop
 393      */
 394
 395     hc[0] = 0x3860ffff;
 396     hc[1] = 0x60000000;
 397     hc[2] = 0x60000000;
 398     hc[3] = 0x60000000;
 399
 400     return 0;
 401 }
 402
 403 bool kvm_arch_stop_on_emulation_error(CPUState *env)
 404 {
 405     return true;
 406 }