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 /* XXX For some odd reason we sometimes hang inside KVM forever. I'd guess it's
  41  *     a race condition where we actually have a level triggered interrupt, but
  42  *     the infrastructure can't expose that yet, so the guest ACKs it, goes to
  43  *     sleep and never gets notified that there's still an interrupt pending.
  44  *
  45  *     As a quick workaround, let's just wake up every 500 ms. That way we can
  46  *     assure that we're always reinjecting interrupts in time.
  47  */
  48 static QEMUTimer *idle_timer;
  49
  50 static void do_nothing(void *opaque)
  51 {
  52     qemu_mod_timer(idle_timer, qemu_get_clock(vm_clock) +
  53                    (get_ticks_per_sec() / 2));
  54 }
  55
  56 int kvm_arch_init(KVMState *s, int smp_cpus)
  57 {
  58     return 0;
  59 }
  60
  61 int kvm_arch_init_vcpu(CPUState *cenv)
  62 {
  63     int ret = 0;
  64     struct kvm_sregs sregs;
  65
  66     sregs.pvr = cenv->spr[SPR_PVR];
  67     ret = kvm_vcpu_ioctl(cenv, KVM_SET_SREGS, &sregs);
  68
  69     return ret;
  70 }
  71
  72 void kvm_arch_reset_vcpu(CPUState *env)
  73 {
  74 }
  75
  76 int kvm_arch_put_registers(CPUState *env, int level)
  77 {
  78     struct kvm_regs regs;
  79     int ret;
  80     int i;
  81
  82     ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
  83     if (ret < 0)
  84         return ret;
  85
  86     regs.ctr = env->ctr;
  87     regs.lr  = env->lr;
  88     regs.xer = env->xer;
  89     regs.msr = env->msr;
  90     regs.pc = env->nip;
  91
  92     regs.srr0 = env->spr[SPR_SRR0];
  93     regs.srr1 = env->spr[SPR_SRR1];
  94
  95     regs.sprg0 = env->spr[SPR_SPRG0];
  96     regs.sprg1 = env->spr[SPR_SPRG1];
  97     regs.sprg2 = env->spr[SPR_SPRG2];
  98     regs.sprg3 = env->spr[SPR_SPRG3];
  99     regs.sprg4 = env->spr[SPR_SPRG4];
 100     regs.sprg5 = env->spr[SPR_SPRG5];
 101     regs.sprg6 = env->spr[SPR_SPRG6];
 102     regs.sprg7 = env->spr[SPR_SPRG7];
 103
 104     for (i = 0;i < 32; i++)
 105         regs.gpr[i] = env->gpr[i];
 106
 107     ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, &regs);
 108     if (ret < 0)
 109         return ret;
 110
 111     return ret;
 112 }
 113
 114 int kvm_arch_get_registers(CPUState *env)
 115 {
 116     struct kvm_regs regs;
 117     struct kvm_sregs sregs;
 118     uint32_t i, ret;
 119
 120     ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
 121     if (ret < 0)
 122         return ret;
 123
 124     ret = kvm_vcpu_ioctl(env, KVM_GET_SREGS, &sregs);
 125     if (ret < 0)
 126         return ret;
 127
 128     env->ctr = regs.ctr;
 129     env->lr = regs.lr;
 130     env->xer = regs.xer;
 131     env->msr = regs.msr;
 132     env->nip = regs.pc;
 133
 134     env->spr[SPR_SRR0] = regs.srr0;
 135     env->spr[SPR_SRR1] = regs.srr1;
 136
 137     env->spr[SPR_SPRG0] = regs.sprg0;
 138     env->spr[SPR_SPRG1] = regs.sprg1;
 139     env->spr[SPR_SPRG2] = regs.sprg2;
 140     env->spr[SPR_SPRG3] = regs.sprg3;
 141     env->spr[SPR_SPRG4] = regs.sprg4;
 142     env->spr[SPR_SPRG5] = regs.sprg5;
 143     env->spr[SPR_SPRG6] = regs.sprg6;
 144     env->spr[SPR_SPRG7] = regs.sprg7;
 145
 146     for (i = 0;i < 32; i++)
 147         env->gpr[i] = regs.gpr[i];
 148
 149 #ifdef KVM_CAP_PPC_SEGSTATE
 150     if (kvm_check_extension(env->kvm_state, KVM_CAP_PPC_SEGSTATE)) {
 151         env->sdr1 = sregs.u.s.sdr1;
 152
 153         /* Sync SLB */
 154 #ifdef TARGET_PPC64
 155         for (i = 0; i < 64; i++) {
 156             ppc_store_slb(env, sregs.u.s.ppc64.slb[i].slbe,
 157                                sregs.u.s.ppc64.slb[i].slbv);
 158         }
 159 #endif
 160
 161         /* Sync SRs */
 162         for (i = 0; i < 16; i++) {
 163             env->sr[i] = sregs.u.s.ppc32.sr[i];
 164         }
 165
 166         /* Sync BATs */
 167         for (i = 0; i < 8; i++) {
 168             env->DBAT[0][i] = sregs.u.s.ppc32.dbat[i] & 0xffffffff;
 169             env->DBAT[1][i] = sregs.u.s.ppc32.dbat[i] >> 32;
 170             env->IBAT[0][i] = sregs.u.s.ppc32.ibat[i] & 0xffffffff;
 171             env->IBAT[1][i] = sregs.u.s.ppc32.ibat[i] >> 32;
 172         }
 173     }
 174 #endif
 175
 176     return 0;
 177 }
 178
 179 #if defined(TARGET_PPCEMB)
 180 #define PPC_INPUT_INT PPC40x_INPUT_INT
 181 #elif defined(TARGET_PPC64)
 182 #define PPC_INPUT_INT PPC970_INPUT_INT
 183 #else
 184 #define PPC_INPUT_INT PPC6xx_INPUT_INT
 185 #endif
 186
 187 int kvm_arch_pre_run(CPUState *env, struct kvm_run *run)
 188 {
 189     int r;
 190     unsigned irq;
 191
 192     if (!idle_timer) {
 193         idle_timer = qemu_new_timer(vm_clock, do_nothing, NULL);
 194         qemu_mod_timer(idle_timer, qemu_get_clock(vm_clock) +
 195                        (get_ticks_per_sec() / 2));
 196     }
 197
 198     /* PowerPC Qemu tracks the various core input pins (interrupt, critical
 199      * interrupt, reset, etc) in PPC-specific env->irq_input_state. */
 200     if (run->ready_for_interrupt_injection &&
 201         (env->interrupt_request & CPU_INTERRUPT_HARD) &&
 202         (env->irq_input_state & (1<<PPC_INPUT_INT)))
 203     {
 204         /* For now KVM disregards the 'irq' argument. However, in the
 205          * future KVM could cache it in-kernel to avoid a heavyweight exit
 206          * when reading the UIC.
 207          */
 208         irq = -1U;
 209
 210         dprintf("injected interrupt %d\n", irq);
 211         r = kvm_vcpu_ioctl(env, KVM_INTERRUPT, &irq);
 212         if (r < 0)
 213             printf("cpu %d fail inject %x\n", env->cpu_index, irq);
 214     }
 215
 216     /* We don't know if there are more interrupts pending after this. However,
 217      * the guest will return to userspace in the course of handling this one
 218      * anyways, so we will get a chance to deliver the rest. */
 219     return 0;
 220 }
 221
 222 int kvm_arch_post_run(CPUState *env, struct kvm_run *run)
 223 {
 224     return 0;
 225 }
 226
 227 static int kvmppc_handle_halt(CPUState *env)
 228 {
 229     if (!(env->interrupt_request & CPU_INTERRUPT_HARD) && (msr_ee)) {
 230         env->halted = 1;
 231         env->exception_index = EXCP_HLT;
 232     }
 233
 234     return 1;
 235 }
 236
 237 /* map dcr access to existing qemu dcr emulation */
 238 static int kvmppc_handle_dcr_read(CPUState *env, uint32_t dcrn, uint32_t *data)
 239 {
 240     if (ppc_dcr_read(env->dcr_env, dcrn, data) < 0)
 241         fprintf(stderr, "Read to unhandled DCR (0x%x)\n", dcrn);
 242
 243     return 1;
 244 }
 245
 246 static int kvmppc_handle_dcr_write(CPUState *env, uint32_t dcrn, uint32_t data)
 247 {
 248     if (ppc_dcr_write(env->dcr_env, dcrn, data) < 0)
 249         fprintf(stderr, "Write to unhandled DCR (0x%x)\n", dcrn);
 250
 251     return 1;
 252 }
 253
 254 int kvm_arch_handle_exit(CPUState *env, struct kvm_run *run)
 255 {
 256     int ret = 0;
 257
 258     switch (run->exit_reason) {
 259     case KVM_EXIT_DCR:
 260         if (run->dcr.is_write) {
 261             dprintf("handle dcr write\n");
 262             ret = kvmppc_handle_dcr_write(env, run->dcr.dcrn, run->dcr.data);
 263         } else {
 264             dprintf("handle dcr read\n");
 265             ret = kvmppc_handle_dcr_read(env, run->dcr.dcrn, &run->dcr.data);
 266         }
 267         break;
 268     case KVM_EXIT_HLT:
 269         dprintf("handle halt\n");
 270         ret = kvmppc_handle_halt(env);
 271         break;
 272     }
 273
 274     return ret;
 275 }
 276
 277 static int read_cpuinfo(const char *field, char *value, int len)
 278 {
 279     FILE *f;
 280     int ret = -1;
 281     int field_len = strlen(field);
 282     char line[512];
 283
 284     f = fopen("/proc/cpuinfo", "r");
 285     if (!f) {
 286         return -1;
 287     }
 288
 289     do {
 290         if(!fgets(line, sizeof(line), f)) {
 291             break;
 292         }
 293         if (!strncmp(line, field, field_len)) {
 294             strncpy(value, line, len);
 295             ret = 0;
 296             break;
 297         }
 298     } while(*line);
 299
 300     fclose(f);
 301
 302     return ret;
 303 }
 304
 305 uint32_t kvmppc_get_tbfreq(void)
 306 {
 307     char line[512];
 308     char *ns;
 309     uint32_t retval = get_ticks_per_sec();
 310
 311     if (read_cpuinfo("timebase", line, sizeof(line))) {
 312         return retval;
 313     }
 314
 315     if (!(ns = strchr(line, ':'))) {
 316         return retval;
 317     }
 318
 319     ns++;
 320
 321     retval = atoi(ns);
 322     return retval;
 323 }