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 int kvm_arch_init(KVMState *s, int smp_cpus)
  41 {
  42     return 0;
  43 }
  44
  45 int kvm_arch_init_vcpu(CPUState *cenv)
  46 {
  47     int ret = 0;
  48     struct kvm_sregs sregs;
  49
  50     sregs.pvr = cenv->spr[SPR_PVR];
  51     ret = kvm_vcpu_ioctl(cenv, KVM_SET_SREGS, &sregs);
  52
  53     return ret;
  54 }
  55
  56 int kvm_arch_put_registers(CPUState *env)
  57 {
  58     struct kvm_regs regs;
  59     int ret;
  60     int i;
  61
  62     ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
  63     if (ret < 0)
  64         return ret;
  65
  66     regs.ctr = env->ctr;
  67     regs.lr  = env->lr;
  68     regs.xer = env->xer;
  69     regs.msr = env->msr;
  70     regs.pc = env->nip;
  71
  72     regs.srr0 = env->spr[SPR_SRR0];
  73     regs.srr1 = env->spr[SPR_SRR1];
  74
  75     regs.sprg0 = env->spr[SPR_SPRG0];
  76     regs.sprg1 = env->spr[SPR_SPRG1];
  77     regs.sprg2 = env->spr[SPR_SPRG2];
  78     regs.sprg3 = env->spr[SPR_SPRG3];
  79     regs.sprg4 = env->spr[SPR_SPRG4];
  80     regs.sprg5 = env->spr[SPR_SPRG5];
  81     regs.sprg6 = env->spr[SPR_SPRG6];
  82     regs.sprg7 = env->spr[SPR_SPRG7];
  83
  84     for (i = 0;i < 32; i++)
  85         regs.gpr[i] = env->gpr[i];
  86
  87     ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, &regs);
  88     if (ret < 0)
  89         return ret;
  90
  91     return ret;
  92 }
  93
  94 int kvm_arch_get_registers(CPUState *env)
  95 {
  96     struct kvm_regs regs;
  97     uint32_t i, ret;
  98
  99     ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
 100     if (ret < 0)
 101         return ret;
 102
 103     env->ctr = regs.ctr;
 104     env->lr = regs.lr;
 105     env->xer = regs.xer;
 106     env->msr = regs.msr;
 107     env->nip = regs.pc;
 108
 109     env->spr[SPR_SRR0] = regs.srr0;
 110     env->spr[SPR_SRR1] = regs.srr1;
 111
 112     env->spr[SPR_SPRG0] = regs.sprg0;
 113     env->spr[SPR_SPRG1] = regs.sprg1;
 114     env->spr[SPR_SPRG2] = regs.sprg2;
 115     env->spr[SPR_SPRG3] = regs.sprg3;
 116     env->spr[SPR_SPRG4] = regs.sprg4;
 117     env->spr[SPR_SPRG5] = regs.sprg5;
 118     env->spr[SPR_SPRG6] = regs.sprg6;
 119     env->spr[SPR_SPRG7] = regs.sprg7;
 120
 121     for (i = 0;i < 32; i++)
 122         env->gpr[i] = regs.gpr[i];
 123
 124     return 0;
 125 }
 126
 127 #if defined(TARGET_PPCEMB)
 128 #define PPC_INPUT_INT PPC40x_INPUT_INT
 129 #elif defined(TARGET_PPC64)
 130 #define PPC_INPUT_INT PPC970_INPUT_INT
 131 #else
 132 #define PPC_INPUT_INT PPC6xx_INPUT_INT
 133 #endif
 134
 135 int kvm_arch_pre_run(CPUState *env, struct kvm_run *run)
 136 {
 137     int r;
 138     unsigned irq;
 139
 140     /* PowerPC Qemu tracks the various core input pins (interrupt, critical
 141      * interrupt, reset, etc) in PPC-specific env->irq_input_state. */
 142     if (run->ready_for_interrupt_injection &&
 143         (env->interrupt_request & CPU_INTERRUPT_HARD) &&
 144         (env->irq_input_state & (1<<PPC_INPUT_INT)))
 145     {
 146         /* For now KVM disregards the 'irq' argument. However, in the
 147          * future KVM could cache it in-kernel to avoid a heavyweight exit
 148          * when reading the UIC.
 149          */
 150         irq = -1U;
 151
 152         dprintf("injected interrupt %d\n", irq);
 153         r = kvm_vcpu_ioctl(env, KVM_INTERRUPT, &irq);
 154         if (r < 0)
 155             printf("cpu %d fail inject %x\n", env->cpu_index, irq);
 156     }
 157
 158     /* We don't know if there are more interrupts pending after this. However,
 159      * the guest will return to userspace in the course of handling this one
 160      * anyways, so we will get a chance to deliver the rest. */
 161     return 0;
 162 }
 163
 164 int kvm_arch_post_run(CPUState *env, struct kvm_run *run)
 165 {
 166     return 0;
 167 }
 168
 169 static int kvmppc_handle_halt(CPUState *env)
 170 {
 171     if (!(env->interrupt_request & CPU_INTERRUPT_HARD) && (msr_ee)) {
 172         env->halted = 1;
 173         env->exception_index = EXCP_HLT;
 174     }
 175
 176     return 1;
 177 }
 178
 179 /* map dcr access to existing qemu dcr emulation */
 180 static int kvmppc_handle_dcr_read(CPUState *env, uint32_t dcrn, uint32_t *data)
 181 {
 182     if (ppc_dcr_read(env->dcr_env, dcrn, data) < 0)
 183         fprintf(stderr, "Read to unhandled DCR (0x%x)\n", dcrn);
 184
 185     return 1;
 186 }
 187
 188 static int kvmppc_handle_dcr_write(CPUState *env, uint32_t dcrn, uint32_t data)
 189 {
 190     if (ppc_dcr_write(env->dcr_env, dcrn, data) < 0)
 191         fprintf(stderr, "Write to unhandled DCR (0x%x)\n", dcrn);
 192
 193     return 1;
 194 }
 195
 196 int kvm_arch_handle_exit(CPUState *env, struct kvm_run *run)
 197 {
 198     int ret = 0;
 199
 200     switch (run->exit_reason) {
 201     case KVM_EXIT_DCR:
 202         if (run->dcr.is_write) {
 203             dprintf("handle dcr write\n");
 204             ret = kvmppc_handle_dcr_write(env, run->dcr.dcrn, run->dcr.data);
 205         } else {
 206             dprintf("handle dcr read\n");
 207             ret = kvmppc_handle_dcr_read(env, run->dcr.dcrn, &run->dcr.data);
 208         }
 209         break;
 210     case KVM_EXIT_HLT:
 211         dprintf("handle halt\n");
 212         ret = kvmppc_handle_halt(env);
 213         break;
 214     }
 215
 216     return ret;
 217 }
 218