Archipelago » qemu

/*

 * PowerPC implementation of KVM hooks

 *

 * Copyright IBM Corp. 2007

 *

 * Authors:

 *  Jerone Young <jyoung5@us.ibm.com>

 *  Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>

 *  Hollis Blanchard <hollisb@us.ibm.com>

 *

 * This work is licensed under the terms of the GNU GPL, version 2 or later.

 * See the COPYING file in the top-level directory.

 *

 */

#include <sys/types.h>

#include <sys/ioctl.h>

#include <sys/mman.h>

#include <linux/kvm.h>

#include "qemu-common.h"

#include "qemu-timer.h"

#include "sysemu.h"

#include "kvm.h"

#include "kvm_ppc.h"

#include "cpu.h"

#include "device_tree.h"

//#define DEBUG_KVM

#ifdef DEBUG_KVM

#define dprintf(fmt, ...) \

    do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)

#else

#define dprintf(fmt, ...) \

    do { } while (0)

#endif

static int cap_interrupt_unset = false;

static int cap_interrupt_level = false;

/* XXX We have a race condition where we actually have a level triggered

 *     interrupt, but the infrastructure can't expose that yet, so the guest

 *     takes but ignores it, goes to sleep and never gets notified that there's

 *     still an interrupt pending.

 *

 *     As a quick workaround, let's just wake up again 20 ms after we injected

 *     an interrupt. That way we can assure that we're always reinjecting

 *     interrupts in case the guest swallowed them.

 */

static QEMUTimer *idle_timer;

static void kvm_kick_env(void *env)

{

    qemu_cpu_kick(env);

}

int kvm_arch_init(KVMState *s, int smp_cpus)

{

#ifdef KVM_CAP_PPC_UNSET_IRQ

    cap_interrupt_unset = kvm_check_extension(s, KVM_CAP_PPC_UNSET_IRQ);

#endif

#ifdef KVM_CAP_PPC_IRQ_LEVEL

    cap_interrupt_level = kvm_check_extension(s, KVM_CAP_PPC_IRQ_LEVEL);

#endif

    if (!cap_interrupt_level) {

        fprintf(stderr, "KVM: Couldn't find level irq capability. Expect the "

                        "VM to stall at times!\n");

    }

    return 0;

}

int kvm_arch_init_vcpu(CPUState *cenv)

{

    int ret = 0;

    struct kvm_sregs sregs;

    sregs.pvr = cenv->spr[SPR_PVR];

    ret = kvm_vcpu_ioctl(cenv, KVM_SET_SREGS, &sregs);

    idle_timer = qemu_new_timer(vm_clock, kvm_kick_env, cenv);

    return ret;

}

void kvm_arch_reset_vcpu(CPUState *env)

{

}

int kvm_arch_put_registers(CPUState *env, int level)

{

    struct kvm_regs regs;

    int ret;

    int i;

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

    if (ret < 0)

        return ret;

    regs.ctr = env->ctr;

    regs.lr  = env->lr;

    regs.xer = env->xer;

    regs.msr = env->msr;

    regs.pc = env->nip;

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

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

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

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

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

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

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

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

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

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

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

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

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

    if (ret < 0)

        return ret;

    return ret;

}

int kvm_arch_get_registers(CPUState *env)

{

    struct kvm_regs regs;

    struct kvm_sregs sregs;

    int i, ret;

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

    if (ret < 0)

        return ret;

    ret = kvm_vcpu_ioctl(env, KVM_GET_SREGS, &sregs);

    if (ret < 0)

        return ret;

    env->ctr = regs.ctr;

    env->lr = regs.lr;

    env->xer = regs.xer;

    env->msr = regs.msr;

    env->nip = regs.pc;

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

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

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

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

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

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

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

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

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

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

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

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

#ifdef KVM_CAP_PPC_SEGSTATE

    if (kvm_check_extension(env->kvm_state, KVM_CAP_PPC_SEGSTATE)) {

        env->sdr1 = sregs.u.s.sdr1;

        /* Sync SLB */

#ifdef TARGET_PPC64

        for (i = 0; i < 64; i++) {

            ppc_store_slb(env, sregs.u.s.ppc64.slb[i].slbe,

                               sregs.u.s.ppc64.slb[i].slbv);

        }

#endif

        /* Sync SRs */

        for (i = 0; i < 16; i++) {

            env->sr[i] = sregs.u.s.ppc32.sr[i];

        }

        /* Sync BATs */

        for (i = 0; i < 8; i++) {

            env->DBAT[0][i] = sregs.u.s.ppc32.dbat[i] & 0xffffffff;

            env->DBAT[1][i] = sregs.u.s.ppc32.dbat[i] >> 32;

            env->IBAT[0][i] = sregs.u.s.ppc32.ibat[i] & 0xffffffff;

            env->IBAT[1][i] = sregs.u.s.ppc32.ibat[i] >> 32;

        }

    }

#endif

    return 0;

}

int kvmppc_set_interrupt(CPUState *env, int irq, int level)

{

    unsigned virq = level ? KVM_INTERRUPT_SET_LEVEL : KVM_INTERRUPT_UNSET;

    if (irq != PPC_INTERRUPT_EXT) {

        return 0;

    }

    if (!kvm_enabled() || !cap_interrupt_unset || !cap_interrupt_level) {

        return 0;

    }

    kvm_vcpu_ioctl(env, KVM_INTERRUPT, &virq);

    return 0;

}

#if defined(TARGET_PPCEMB)

#define PPC_INPUT_INT PPC40x_INPUT_INT

#elif defined(TARGET_PPC64)

#define PPC_INPUT_INT PPC970_INPUT_INT

#else

#define PPC_INPUT_INT PPC6xx_INPUT_INT

#endif

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

{

    int r;

    unsigned irq;

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

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

    if (!cap_interrupt_level &&

        run->ready_for_interrupt_injection &&

        (env->interrupt_request & CPU_INTERRUPT_HARD) &&

        (env->irq_input_state & (1<<PPC_INPUT_INT)))

    {

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

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

         * when reading the UIC.

         */

        irq = KVM_INTERRUPT_SET;

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

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

        if (r < 0)

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

        /* Always wake up soon in case the interrupt was level based */

        qemu_mod_timer(idle_timer, qemu_get_clock(vm_clock) +

                       (get_ticks_per_sec() / 50));

    }

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

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

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

    return 0;

}

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

{

    return 0;

}

int kvm_arch_process_irqchip_events(CPUState *env)

{

    return 0;

}

static int kvmppc_handle_halt(CPUState *env)

{

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

        env->halted = 1;

        env->exception_index = EXCP_HLT;

    }

    return 1;

}

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

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

{

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

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

    return 1;

}

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

{

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

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

    return 1;

}

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

{

    int ret = 0;

    switch (run->exit_reason) {

    case KVM_EXIT_DCR:

        if (run->dcr.is_write) {

            dprintf("handle dcr write\n");

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

        } else {

            dprintf("handle dcr read\n");

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

        }

        break;

    case KVM_EXIT_HLT:

        dprintf("handle halt\n");

        ret = kvmppc_handle_halt(env);

        break;

    default:

        fprintf(stderr, "KVM: unknown exit reason %d\n", run->exit_reason);

        ret = -1;

        break;

    }

    return ret;

}

static int read_cpuinfo(const char *field, char *value, int len)

{

    FILE *f;

    int ret = -1;

    int field_len = strlen(field);

    char line[512];

    f = fopen("/proc/cpuinfo", "r");

    if (!f) {

        return -1;

    }

    do {

        if(!fgets(line, sizeof(line), f)) {

            break;

        }

        if (!strncmp(line, field, field_len)) {

            strncpy(value, line, len);

            ret = 0;

            break;

        }

    } while(*line);

    fclose(f);

    return ret;

}

uint32_t kvmppc_get_tbfreq(void)

{

    char line[512];

    char *ns;

    uint32_t retval = get_ticks_per_sec();

    if (read_cpuinfo("timebase", line, sizeof(line))) {

        return retval;

    }

    if (!(ns = strchr(line, ':'))) {

        return retval;

    }

    ns++;

    retval = atoi(ns);

    return retval;

}

int kvmppc_get_hypercall(CPUState *env, uint8_t *buf, int buf_len)

{

    uint32_t *hc = (uint32_t*)buf;

#ifdef KVM_CAP_PPC_GET_PVINFO

    struct kvm_ppc_pvinfo pvinfo;

    if (kvm_check_extension(env->kvm_state, KVM_CAP_PPC_GET_PVINFO) &&

        !kvm_vm_ioctl(env->kvm_state, KVM_PPC_GET_PVINFO, &pvinfo)) {

        memcpy(buf, pvinfo.hcall, buf_len);

        return 0;

    }

#endif

    /*

     * Fallback to always fail hypercalls:

     *

     *     li r3, -1

     *     nop

     *     nop

     *     nop

     */

    hc[0] = 0x3860ffff;

    hc[1] = 0x60000000;

    hc[2] = 0x60000000;

    hc[3] = 0x60000000;

    return 0;

}

bool kvm_arch_stop_on_emulation_error(CPUState *env)

{

    return true;

}