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 void kvm_arch_reset_vcpu(CPUState *env)
  57 {
  58 }
  59
  60 int kvm_arch_put_registers(CPUState *env)
  61 {
  62     struct kvm_regs regs;
  63     int ret;
  64     int i;
  65
  66     ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
  67     if (ret < 0)
  68         return ret;
  69
  70     regs.ctr = env->ctr;
  71     regs.lr  = env->lr;
  72     regs.xer = env->xer;
  73     regs.msr = env->msr;
  74     regs.pc = env->nip;
  75
  76     regs.srr0 = env->spr[SPR_SRR0];
  77     regs.srr1 = env->spr[SPR_SRR1];
  78
  79     regs.sprg0 = env->spr[SPR_SPRG0];
  80     regs.sprg1 = env->spr[SPR_SPRG1];
  81     regs.sprg2 = env->spr[SPR_SPRG2];
  82     regs.sprg3 = env->spr[SPR_SPRG3];
  83     regs.sprg4 = env->spr[SPR_SPRG4];
  84     regs.sprg5 = env->spr[SPR_SPRG5];
  85     regs.sprg6 = env->spr[SPR_SPRG6];
  86     regs.sprg7 = env->spr[SPR_SPRG7];
  87
  88     for (i = 0;i < 32; i++)
  89         regs.gpr[i] = env->gpr[i];
  90
  91     ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, &regs);
  92     if (ret < 0)
  93         return ret;
  94
  95     return ret;
  96 }
  97
  98 int kvm_arch_get_registers(CPUState *env)
  99 {
 100     struct kvm_regs regs;
 101     uint32_t i, ret;
 102
 103     ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
 104     if (ret < 0)
 105         return ret;
 106
 107     env->ctr = regs.ctr;
 108     env->lr = regs.lr;
 109     env->xer = regs.xer;
 110     env->msr = regs.msr;
 111     env->nip = regs.pc;
 112
 113     env->spr[SPR_SRR0] = regs.srr0;
 114     env->spr[SPR_SRR1] = regs.srr1;
 115
 116     env->spr[SPR_SPRG0] = regs.sprg0;
 117     env->spr[SPR_SPRG1] = regs.sprg1;
 118     env->spr[SPR_SPRG2] = regs.sprg2;
 119     env->spr[SPR_SPRG3] = regs.sprg3;
 120     env->spr[SPR_SPRG4] = regs.sprg4;
 121     env->spr[SPR_SPRG5] = regs.sprg5;
 122     env->spr[SPR_SPRG6] = regs.sprg6;
 123     env->spr[SPR_SPRG7] = regs.sprg7;
 124
 125     for (i = 0;i < 32; i++)
 126         env->gpr[i] = regs.gpr[i];
 127
 128     return 0;
 129 }
 130
 131 #if defined(TARGET_PPCEMB)
 132 #define PPC_INPUT_INT PPC40x_INPUT_INT
 133 #elif defined(TARGET_PPC64)
 134 #define PPC_INPUT_INT PPC970_INPUT_INT
 135 #else
 136 #define PPC_INPUT_INT PPC6xx_INPUT_INT
 137 #endif
 138
 139 int kvm_arch_pre_run(CPUState *env, struct kvm_run *run)
 140 {
 141     int r;
 142     unsigned irq;
 143
 144     /* PowerPC Qemu tracks the various core input pins (interrupt, critical
 145      * interrupt, reset, etc) in PPC-specific env->irq_input_state. */
 146     if (run->ready_for_interrupt_injection &&
 147         (env->interrupt_request & CPU_INTERRUPT_HARD) &&
 148         (env->irq_input_state & (1<<PPC_INPUT_INT)))
 149     {
 150         /* For now KVM disregards the 'irq' argument. However, in the
 151          * future KVM could cache it in-kernel to avoid a heavyweight exit
 152          * when reading the UIC.
 153          */
 154         irq = -1U;
 155
 156         dprintf("injected interrupt %d\n", irq);
 157         r = kvm_vcpu_ioctl(env, KVM_INTERRUPT, &irq);
 158         if (r < 0)
 159             printf("cpu %d fail inject %x\n", env->cpu_index, irq);
 160     }
 161
 162     /* We don't know if there are more interrupts pending after this. However,
 163      * the guest will return to userspace in the course of handling this one
 164      * anyways, so we will get a chance to deliver the rest. */
 165     return 0;
 166 }
 167
 168 int kvm_arch_post_run(CPUState *env, struct kvm_run *run)
 169 {
 170     return 0;
 171 }
 172
 173 static int kvmppc_handle_halt(CPUState *env)
 174 {
 175     if (!(env->interrupt_request & CPU_INTERRUPT_HARD) && (msr_ee)) {
 176         env->halted = 1;
 177         env->exception_index = EXCP_HLT;
 178     }
 179
 180     return 1;
 181 }
 182
 183 /* map dcr access to existing qemu dcr emulation */
 184 static int kvmppc_handle_dcr_read(CPUState *env, uint32_t dcrn, uint32_t *data)
 185 {
 186     if (ppc_dcr_read(env->dcr_env, dcrn, data) < 0)
 187         fprintf(stderr, "Read to unhandled DCR (0x%x)\n", dcrn);
 188
 189     return 1;
 190 }
 191
 192 static int kvmppc_handle_dcr_write(CPUState *env, uint32_t dcrn, uint32_t data)
 193 {
 194     if (ppc_dcr_write(env->dcr_env, dcrn, data) < 0)
 195         fprintf(stderr, "Write to unhandled DCR (0x%x)\n", dcrn);
 196
 197     return 1;
 198 }
 199
 200 int kvm_arch_handle_exit(CPUState *env, struct kvm_run *run)
 201 {
 202     int ret = 0;
 203
 204     switch (run->exit_reason) {
 205     case KVM_EXIT_DCR:
 206         if (run->dcr.is_write) {
 207             dprintf("handle dcr write\n");
 208             ret = kvmppc_handle_dcr_write(env, run->dcr.dcrn, run->dcr.data);
 209         } else {
 210             dprintf("handle dcr read\n");
 211             ret = kvmppc_handle_dcr_read(env, run->dcr.dcrn, &run->dcr.data);
 212         }
 213         break;
 214     case KVM_EXIT_HLT:
 215         dprintf("handle halt\n");
 216         ret = kvmppc_handle_halt(env);
 217         break;
 218     }
 219
 220     return ret;
 221 }
 222