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     return 0;

    48 }

    49 

    50 int kvm_arch_put_registers(CPUState *env)

    51 {

    52     struct kvm_regs regs;

    53     int ret;

    54     int i;

    55 

    56     ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);

    57     if (ret < 0)

    58         return ret;

    59 

    60     regs.ctr = env->ctr;

    61     regs.lr  = env->lr;

    62     regs.xer = env->xer;

    63     regs.msr = env->msr;

    64     regs.pc = env->nip;

    65 

    66     regs.srr0 = env->spr[SPR_SRR0];

    67     regs.srr1 = env->spr[SPR_SRR1];

    68 

    69     regs.sprg0 = env->spr[SPR_SPRG0];

    70     regs.sprg1 = env->spr[SPR_SPRG1];

    71     regs.sprg2 = env->spr[SPR_SPRG2];

    72     regs.sprg3 = env->spr[SPR_SPRG3];

    73     regs.sprg4 = env->spr[SPR_SPRG4];

    74     regs.sprg5 = env->spr[SPR_SPRG5];

    75     regs.sprg6 = env->spr[SPR_SPRG6];

    76     regs.sprg7 = env->spr[SPR_SPRG7];

    77 

    78     for (i = 0;i < 32; i++)

    79         regs.gpr[i] = env->gpr[i];

    80 

    81     ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, &regs);

    82     if (ret < 0)

    83         return ret;

    84 

    85     return ret;

    86 }

    87 

    88 int kvm_arch_get_registers(CPUState *env)

    89 {

    90     struct kvm_regs regs;

    91     uint32_t i, ret;

    92 

    93     ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);

    94     if (ret < 0)

    95         return ret;

    96 

    97     env->ctr = regs.ctr;

    98     env->lr = regs.lr;

    99     env->xer = regs.xer;

   100     env->msr = regs.msr;

   101     env->nip = regs.pc;

   102 

   103     env->spr[SPR_SRR0] = regs.srr0;

   104     env->spr[SPR_SRR1] = regs.srr1;

   105 

   106     env->spr[SPR_SPRG0] = regs.sprg0;

   107     env->spr[SPR_SPRG1] = regs.sprg1;

   108     env->spr[SPR_SPRG2] = regs.sprg2;

   109     env->spr[SPR_SPRG3] = regs.sprg3;

   110     env->spr[SPR_SPRG4] = regs.sprg4;

   111     env->spr[SPR_SPRG5] = regs.sprg5;

   112     env->spr[SPR_SPRG6] = regs.sprg6;

   113     env->spr[SPR_SPRG7] = regs.sprg7;

   114 

   115     for (i = 0;i < 32; i++)

   116         env->gpr[i] = regs.gpr[i];

   117 

   118     return 0;

   119 }

   120 

   121 int kvm_arch_pre_run(CPUState *env, struct kvm_run *run)

   122 {

   123     int r;

   124     unsigned irq;

   125 

   126     /* PowerPC Qemu tracks the various core input pins (interrupt, critical

   127      * interrupt, reset, etc) in PPC-specific env->irq_input_state. */

   128     if (run->ready_for_interrupt_injection &&

   129         (env->interrupt_request & CPU_INTERRUPT_HARD) &&

   130         (env->irq_input_state & (1<<PPC40x_INPUT_INT)))

   131     {

   132         /* For now KVM disregards the 'irq' argument. However, in the

   133          * future KVM could cache it in-kernel to avoid a heavyweight exit

   134          * when reading the UIC.

   135          */

   136         irq = -1U;

   137 

   138         dprintf("injected interrupt %d\n", irq);

   139         r = kvm_vcpu_ioctl(env, KVM_INTERRUPT, &irq);

   140         if (r < 0)

   141             printf("cpu %d fail inject %x\n", env->cpu_index, irq);

   142     }

   143 

   144     /* We don't know if there are more interrupts pending after this. However,

   145      * the guest will return to userspace in the course of handling this one

   146      * anyways, so we will get a chance to deliver the rest. */

   147     return 0;

   148 }

   149 

   150 int kvm_arch_post_run(CPUState *env, struct kvm_run *run)

   151 {

   152     return 0;

   153 }

   154 

   155 static int kvmppc_handle_halt(CPUState *env)

   156 {

   157     if (!(env->interrupt_request & CPU_INTERRUPT_HARD) && (msr_ee)) {

   158         env->halted = 1;

   159         env->exception_index = EXCP_HLT;

   160     }

   161 

   162     return 1;

   163 }

   164 

   165 /* map dcr access to existing qemu dcr emulation */

   166 static int kvmppc_handle_dcr_read(CPUState *env, uint32_t dcrn, uint32_t *data)

   167 {

   168     if (ppc_dcr_read(env->dcr_env, dcrn, data) < 0)

   169         fprintf(stderr, "Read to unhandled DCR (0x%x)\n", dcrn);

   170 

   171     return 1;

   172 }

   173 

   174 static int kvmppc_handle_dcr_write(CPUState *env, uint32_t dcrn, uint32_t data)

   175 {

   176     if (ppc_dcr_write(env->dcr_env, dcrn, data) < 0)

   177         fprintf(stderr, "Write to unhandled DCR (0x%x)\n", dcrn);

   178 

   179     return 1;

   180 }

   181 

   182 int kvm_arch_handle_exit(CPUState *env, struct kvm_run *run)

   183 {

   184     int ret = 0;

   185 

   186     switch (run->exit_reason) {

   187     case KVM_EXIT_DCR:

   188         if (run->dcr.is_write) {

   189             dprintf("handle dcr write\n");

   190             ret = kvmppc_handle_dcr_write(env, run->dcr.dcrn, run->dcr.data);

   191         } else {

   192             dprintf("handle dcr read\n");

   193             ret = kvmppc_handle_dcr_read(env, run->dcr.dcrn, &run->dcr.data);

   194         }

   195         break;

   196     case KVM_EXIT_HLT:

   197         dprintf("handle halt\n");

   198         ret = kvmppc_handle_halt(env);

   199         break;

   200     }

   201 

   202     return ret;

   203 }

   204