booke.c

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/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2, as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright IBM Corp. 2007
 * Copyright 2010-2011 Freescale Semiconductor, Inc.
 *
 * Authors: Hollis Blanchard <[email protected]>
 *          Christian Ehrhardt <[email protected]>
 *          Scott Wood <[email protected]>
 *          Varun Sethi <[email protected]>
 */

#include <linux/errno.h>
#include <linux/err.h>
#include <linux/kvm_host.h>
#include <linux/gfp.h>
#include <linux/module.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>

#include <asm/cputable.h>
#include <asm/uaccess.h>
#include <asm/kvm_ppc.h>
#include <asm/cacheflush.h>
#include <asm/dbell.h>
#include <asm/hw_irq.h>
#include <asm/irq.h>

#include "timing.h"
#include "booke.h"

unsigned long kvmppc_booke_handlers;

#define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU

struct kvm_stats_debugfs_item debugfs_entries[] = {
    { "mmio",       VCPU_STAT(mmio_exits) },
    { "dcr",        VCPU_STAT(dcr_exits) },
    { "sig",        VCPU_STAT(signal_exits) },
    { "itlb_r",     VCPU_STAT(itlb_real_miss_exits) },
    { "itlb_v",     VCPU_STAT(itlb_virt_miss_exits) },
    { "dtlb_r",     VCPU_STAT(dtlb_real_miss_exits) },
    { "dtlb_v",     VCPU_STAT(dtlb_virt_miss_exits) },
    { "sysc",       VCPU_STAT(syscall_exits) },
    { "isi",        VCPU_STAT(isi_exits) },
    { "dsi",        VCPU_STAT(dsi_exits) },
    { "inst_emu",   VCPU_STAT(emulated_inst_exits) },
    { "dec",        VCPU_STAT(dec_exits) },
    { "ext_intr",   VCPU_STAT(ext_intr_exits) },
    { "halt_wakeup", VCPU_STAT(halt_wakeup) },
    { "doorbell", VCPU_STAT(dbell_exits) },
    { "guest doorbell", VCPU_STAT(gdbell_exits) },
    { NULL }
};

/* TODO: use vcpu_printf() */
void kvmppc_dump_vcpu(struct kvm_vcpu *vcpu)
{
    int i;

    printk("pc:   %08lx msr:  %08llx\n", vcpu->arch.pc, vcpu->arch.shared->msr);
    printk("lr:   %08lx ctr:  %08lx\n", vcpu->arch.lr, vcpu->arch.ctr);
    printk("srr0: %08llx srr1: %08llx\n", vcpu->arch.shared->srr0,
                        vcpu->arch.shared->srr1);

    printk("exceptions: %08lx\n", vcpu->arch.pending_exceptions);

    for (i = 0; i < 32; i += 4) {
        printk("gpr%02d: %08lx %08lx %08lx %08lx\n", i,
               kvmppc_get_gpr(vcpu, i),
               kvmppc_get_gpr(vcpu, i+1),
               kvmppc_get_gpr(vcpu, i+2),
               kvmppc_get_gpr(vcpu, i+3));
    }
}

#ifdef CONFIG_SPE
void kvmppc_vcpu_disable_spe(struct kvm_vcpu *vcpu)
{
    preempt_disable();
    enable_kernel_spe();
    kvmppc_save_guest_spe(vcpu);
    vcpu->arch.shadow_msr &= ~MSR_SPE;
    preempt_enable();
}

static void kvmppc_vcpu_enable_spe(struct kvm_vcpu *vcpu)
{
    preempt_disable();
    enable_kernel_spe();
    kvmppc_load_guest_spe(vcpu);
    vcpu->arch.shadow_msr |= MSR_SPE;
    preempt_enable();
}

static void kvmppc_vcpu_sync_spe(struct kvm_vcpu *vcpu)
{
    if (vcpu->arch.shared->msr & MSR_SPE) {
        if (!(vcpu->arch.shadow_msr & MSR_SPE))
            kvmppc_vcpu_enable_spe(vcpu);
    } else if (vcpu->arch.shadow_msr & MSR_SPE) {
        kvmppc_vcpu_disable_spe(vcpu);
    }
}
#else
static void kvmppc_vcpu_sync_spe(struct kvm_vcpu *vcpu)
{
}
#endif

/*
 * Helper function for "full" MSR writes.  No need to call this if only
 * EE/CE/ME/DE/RI are changing.
 */
void kvmppc_set_msr(struct kvm_vcpu *vcpu, u32 new_msr)
{
    u32 old_msr = vcpu->arch.shared->msr;

#ifdef CONFIG_KVM_BOOKE_HV
    new_msr |= MSR_GS;
#endif

    vcpu->arch.shared->msr = new_msr;

    kvmppc_mmu_msr_notify(vcpu, old_msr);
    kvmppc_vcpu_sync_spe(vcpu);
}

static void kvmppc_booke_queue_irqprio(struct kvm_vcpu *vcpu,
                                       unsigned int priority)
{
    set_bit(priority, &vcpu->arch.pending_exceptions);
}

static void kvmppc_core_queue_dtlb_miss(struct kvm_vcpu *vcpu,
                                        ulong dear_flags, ulong esr_flags)
{
    vcpu->arch.queued_dear = dear_flags;
    vcpu->arch.queued_esr = esr_flags;
    kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DTLB_MISS);
}

static void kvmppc_core_queue_data_storage(struct kvm_vcpu *vcpu,
                                           ulong dear_flags, ulong esr_flags)
{
    vcpu->arch.queued_dear = dear_flags;
    vcpu->arch.queued_esr = esr_flags;
    kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DATA_STORAGE);
}

static void kvmppc_core_queue_inst_storage(struct kvm_vcpu *vcpu,
                                           ulong esr_flags)
{
    vcpu->arch.queued_esr = esr_flags;
    kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_INST_STORAGE);
}

void kvmppc_core_queue_program(struct kvm_vcpu *vcpu, ulong esr_flags)
{
    vcpu->arch.queued_esr = esr_flags;
    kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_PROGRAM);
}

void kvmppc_core_queue_dec(struct kvm_vcpu *vcpu)
{
    kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DECREMENTER);
}

int kvmppc_core_pending_dec(struct kvm_vcpu *vcpu)
{
    return test_bit(BOOKE_IRQPRIO_DECREMENTER, &vcpu->arch.pending_exceptions);
}

void kvmppc_core_dequeue_dec(struct kvm_vcpu *vcpu)
{
    clear_bit(BOOKE_IRQPRIO_DECREMENTER, &vcpu->arch.pending_exceptions);
}

void kvmppc_core_queue_external(struct kvm_vcpu *vcpu,
                                struct kvm_interrupt *irq)
{
    unsigned int prio = BOOKE_IRQPRIO_EXTERNAL;

    if (irq->irq == KVM_INTERRUPT_SET_LEVEL)
        prio = BOOKE_IRQPRIO_EXTERNAL_LEVEL;

    kvmppc_booke_queue_irqprio(vcpu, prio);
}

void kvmppc_core_dequeue_external(struct kvm_vcpu *vcpu,
                                  struct kvm_interrupt *irq)
{
    clear_bit(BOOKE_IRQPRIO_EXTERNAL, &vcpu->arch.pending_exceptions);
    clear_bit(BOOKE_IRQPRIO_EXTERNAL_LEVEL, &vcpu->arch.pending_exceptions);
}

static void set_guest_srr(struct kvm_vcpu *vcpu, unsigned long srr0, u32 srr1)
{
#ifdef CONFIG_KVM_BOOKE_HV
    mtspr(SPRN_GSRR0, srr0);
    mtspr(SPRN_GSRR1, srr1);
#else
    vcpu->arch.shared->srr0 = srr0;
    vcpu->arch.shared->srr1 = srr1;
#endif
}

static void set_guest_csrr(struct kvm_vcpu *vcpu, unsigned long srr0, u32 srr1)
{
    vcpu->arch.csrr0 = srr0;
    vcpu->arch.csrr1 = srr1;
}

static void set_guest_dsrr(struct kvm_vcpu *vcpu, unsigned long srr0, u32 srr1)
{
    if (cpu_has_feature(CPU_FTR_DEBUG_LVL_EXC)) {
        vcpu->arch.dsrr0 = srr0;
        vcpu->arch.dsrr1 = srr1;
    } else {
        set_guest_csrr(vcpu, srr0, srr1);
    }
}

static void set_guest_mcsrr(struct kvm_vcpu *vcpu, unsigned long srr0, u32 srr1)
{
    vcpu->arch.mcsrr0 = srr0;
    vcpu->arch.mcsrr1 = srr1;
}

static unsigned long get_guest_dear(struct kvm_vcpu *vcpu)
{
#ifdef CONFIG_KVM_BOOKE_HV
    return mfspr(SPRN_GDEAR);
#else
    return vcpu->arch.shared->dar;
#endif
}

static void set_guest_dear(struct kvm_vcpu *vcpu, unsigned long dear)
{
#ifdef CONFIG_KVM_BOOKE_HV
    mtspr(SPRN_GDEAR, dear);
#else
    vcpu->arch.shared->dar = dear;
#endif
}

static unsigned long get_guest_esr(struct kvm_vcpu *vcpu)
{
#ifdef CONFIG_KVM_BOOKE_HV
    return mfspr(SPRN_GESR);
#else
    return vcpu->arch.shared->esr;
#endif
}

static void set_guest_esr(struct kvm_vcpu *vcpu, u32 esr)
{
#ifdef CONFIG_KVM_BOOKE_HV
    mtspr(SPRN_GESR, esr);
#else
    vcpu->arch.shared->esr = esr;
#endif
}

/* Deliver the interrupt of the corresponding priority, if possible. */
static int kvmppc_booke_irqprio_deliver(struct kvm_vcpu *vcpu,
                                        unsigned int priority)
{
    int allowed = 0;
    ulong msr_mask = 0;
    bool update_esr = false, update_dear = false;
    ulong crit_raw = vcpu->arch.shared->critical;
    ulong crit_r1 = kvmppc_get_gpr(vcpu, 1);
    bool crit;
    bool keep_irq = false;
    enum int_class int_class;

    /* Truncate crit indicators in 32 bit mode */
    if (!(vcpu->arch.shared->msr & MSR_SF)) {
        crit_raw &= 0xffffffff;
        crit_r1 &= 0xffffffff;
    }

    /* Critical section when crit == r1 */
    crit = (crit_raw == crit_r1);
    /* ... and we're in supervisor mode */
    crit = crit && !(vcpu->arch.shared->msr & MSR_PR);

    if (priority == BOOKE_IRQPRIO_EXTERNAL_LEVEL) {
        priority = BOOKE_IRQPRIO_EXTERNAL;
        keep_irq = true;
    }

    switch (priority) {
    case BOOKE_IRQPRIO_DTLB_MISS:
    case BOOKE_IRQPRIO_DATA_STORAGE:
        update_dear = true;
        /* fall through */
    case BOOKE_IRQPRIO_INST_STORAGE:
    case BOOKE_IRQPRIO_PROGRAM:
        update_esr = true;
        /* fall through */
    case BOOKE_IRQPRIO_ITLB_MISS:
    case BOOKE_IRQPRIO_SYSCALL:
    case BOOKE_IRQPRIO_FP_UNAVAIL:
    case BOOKE_IRQPRIO_SPE_UNAVAIL:
    case BOOKE_IRQPRIO_SPE_FP_DATA:
    case BOOKE_IRQPRIO_SPE_FP_ROUND:
    case BOOKE_IRQPRIO_AP_UNAVAIL:
    case BOOKE_IRQPRIO_ALIGNMENT:
        allowed = 1;
        msr_mask = MSR_CE | MSR_ME | MSR_DE;
        int_class = INT_CLASS_NONCRIT;
        break;
    case BOOKE_IRQPRIO_CRITICAL:
    case BOOKE_IRQPRIO_DBELL_CRIT:
        allowed = vcpu->arch.shared->msr & MSR_CE;
        allowed = allowed && !crit;
        msr_mask = MSR_ME;
        int_class = INT_CLASS_CRIT;
        break;
    case BOOKE_IRQPRIO_MACHINE_CHECK:
        allowed = vcpu->arch.shared->msr & MSR_ME;
        allowed = allowed && !crit;
        int_class = INT_CLASS_MC;
        break;
    case BOOKE_IRQPRIO_DECREMENTER:
    case BOOKE_IRQPRIO_FIT:
        keep_irq = true;
        /* fall through */
    case BOOKE_IRQPRIO_EXTERNAL:
    case BOOKE_IRQPRIO_DBELL:
        allowed = vcpu->arch.shared->msr & MSR_EE;
        allowed = allowed && !crit;
        msr_mask = MSR_CE | MSR_ME | MSR_DE;
        int_class = INT_CLASS_NONCRIT;
        break;
    case BOOKE_IRQPRIO_DEBUG:
        allowed = vcpu->arch.shared->msr & MSR_DE;
        allowed = allowed && !crit;
        msr_mask = MSR_ME;
        int_class = INT_CLASS_CRIT;
        break;
    }

    if (allowed) {
        switch (int_class) {
        case INT_CLASS_NONCRIT:
            set_guest_srr(vcpu, vcpu->arch.pc,
                      vcpu->arch.shared->msr);
            break;
        case INT_CLASS_CRIT:
            set_guest_csrr(vcpu, vcpu->arch.pc,
                       vcpu->arch.shared->msr);
            break;
        case INT_CLASS_DBG:
            set_guest_dsrr(vcpu, vcpu->arch.pc,
                       vcpu->arch.shared->msr);
            break;
        case INT_CLASS_MC:
            set_guest_mcsrr(vcpu, vcpu->arch.pc,
                    vcpu->arch.shared->msr);
            break;
        }

        vcpu->arch.pc = vcpu->arch.ivpr | vcpu->arch.ivor[priority];
        if (update_esr == true)
            set_guest_esr(vcpu, vcpu->arch.queued_esr);
        if (update_dear == true)
            set_guest_dear(vcpu, vcpu->arch.queued_dear);
        kvmppc_set_msr(vcpu, vcpu->arch.shared->msr & msr_mask);

        if (!keep_irq)
            clear_bit(priority, &vcpu->arch.pending_exceptions);
    }

#ifdef CONFIG_KVM_BOOKE_HV
    /*
     * If an interrupt is pending but masked, raise a guest doorbell
     * so that we are notified when the guest enables the relevant
     * MSR bit.
     */
    if (vcpu->arch.pending_exceptions & BOOKE_IRQMASK_EE)
        kvmppc_set_pending_interrupt(vcpu, INT_CLASS_NONCRIT);
    if (vcpu->arch.pending_exceptions & BOOKE_IRQMASK_CE)
        kvmppc_set_pending_interrupt(vcpu, INT_CLASS_CRIT);
    if (vcpu->arch.pending_exceptions & BOOKE_IRQPRIO_MACHINE_CHECK)
        kvmppc_set_pending_interrupt(vcpu, INT_CLASS_MC);
#endif

    return allowed;
}

static void update_timer_ints(struct kvm_vcpu *vcpu)
{
    if ((vcpu->arch.tcr & TCR_DIE) && (vcpu->arch.tsr & TSR_DIS))
        kvmppc_core_queue_dec(vcpu);
    else
        kvmppc_core_dequeue_dec(vcpu);
}

static void kvmppc_core_check_exceptions(struct kvm_vcpu *vcpu)
{
    unsigned long *pending = &vcpu->arch.pending_exceptions;
    unsigned int priority;

    if (vcpu->requests) {
        if (kvm_check_request(KVM_REQ_PENDING_TIMER, vcpu)) {
            smp_mb();
            update_timer_ints(vcpu);
        }
    }

    priority = __ffs(*pending);
    while (priority < BOOKE_IRQPRIO_MAX) {
        if (kvmppc_booke_irqprio_deliver(vcpu, priority))
            break;

        priority = find_next_bit(pending,
                                 BITS_PER_BYTE * sizeof(*pending),
                                 priority + 1);
    }

    /* Tell the guest about our interrupt status */
    vcpu->arch.shared->int_pending = !!*pending;
}

/* Check pending exceptions and deliver one, if possible. */
int kvmppc_core_prepare_to_enter(struct kvm_vcpu *vcpu)
{
    int r = 0;
    WARN_ON_ONCE(!irqs_disabled());

    kvmppc_core_check_exceptions(vcpu);

    if (vcpu->arch.shared->msr & MSR_WE) {
        local_irq_enable();
        kvm_vcpu_block(vcpu);
        clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
        local_irq_disable();

        kvmppc_set_exit_type(vcpu, EMULATED_MTMSRWE_EXITS);
        r = 1;
    };

    return r;
}

/*
 * Common checks before entering the guest world.  Call with interrupts
 * disabled.
 *
 * returns !0 if a signal is pending and check_signal is true
 */
static int kvmppc_prepare_to_enter(struct kvm_vcpu *vcpu)
{
    int r = 0;

    WARN_ON_ONCE(!irqs_disabled());
    while (true) {
        if (need_resched()) {
            local_irq_enable();
            cond_resched();
            local_irq_disable();
            continue;
        }

        if (signal_pending(current)) {
            r = 1;
            break;
        }

        if (kvmppc_core_prepare_to_enter(vcpu)) {
            /* interrupts got enabled in between, so we
               are back at square 1 */
            continue;
        }

        break;
    }

    return r;
}

int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
{
    int ret;
#ifdef CONFIG_PPC_FPU
    unsigned int fpscr;
    int fpexc_mode;
    u64 fpr[32];
#endif

    if (!vcpu->arch.sane) {
        kvm_run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
        return -EINVAL;
    }

    local_irq_disable();
    if (kvmppc_prepare_to_enter(vcpu)) {
        kvm_run->exit_reason = KVM_EXIT_INTR;
        ret = -EINTR;
        goto out;
    }

    kvm_guest_enter();

#ifdef CONFIG_PPC_FPU
    /* Save userspace FPU state in stack */
    enable_kernel_fp();
    memcpy(fpr, current->thread.fpr, sizeof(current->thread.fpr));
    fpscr = current->thread.fpscr.val;
    fpexc_mode = current->thread.fpexc_mode;

    /* Restore guest FPU state to thread */
    memcpy(current->thread.fpr, vcpu->arch.fpr, sizeof(vcpu->arch.fpr));
    current->thread.fpscr.val = vcpu->arch.fpscr;

    /*
     * Since we can't trap on MSR_FP in GS-mode, we consider the guest
     * as always using the FPU.  Kernel usage of FP (via
     * enable_kernel_fp()) in this thread must not occur while
     * vcpu->fpu_active is set.
     */
    vcpu->fpu_active = 1;

    kvmppc_load_guest_fp(vcpu);
#endif

    ret = __kvmppc_vcpu_run(kvm_run, vcpu);

#ifdef CONFIG_PPC_FPU
    kvmppc_save_guest_fp(vcpu);

    vcpu->fpu_active = 0;

    /* Save guest FPU state from thread */
    memcpy(vcpu->arch.fpr, current->thread.fpr, sizeof(vcpu->arch.fpr));
    vcpu->arch.fpscr = current->thread.fpscr.val;

    /* Restore userspace FPU state from stack */
    memcpy(current->thread.fpr, fpr, sizeof(current->thread.fpr));
    current->thread.fpscr.val = fpscr;
    current->thread.fpexc_mode = fpexc_mode;
#endif

    kvm_guest_exit();

out:
    local_irq_enable();
    return ret;
}

static int emulation_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
{
    enum emulation_result er;

    er = kvmppc_emulate_instruction(run, vcpu);
    switch (er) {
    case EMULATE_DONE:
        /* don't overwrite subtypes, just account kvm_stats */
        kvmppc_account_exit_stat(vcpu, EMULATED_INST_EXITS);
        /* Future optimization: only reload non-volatiles if
         * they were actually modified by emulation. */
        return RESUME_GUEST_NV;

    case EMULATE_DO_DCR:
        run->exit_reason = KVM_EXIT_DCR;
        return RESUME_HOST;

    case EMULATE_FAIL:
        printk(KERN_CRIT "%s: emulation at %lx failed (%08x)\n",
               __func__, vcpu->arch.pc, vcpu->arch.last_inst);
        /* For debugging, encode the failing instruction and
         * report it to userspace. */
        run->hw.hardware_exit_reason = ~0ULL << 32;
        run->hw.hardware_exit_reason |= vcpu->arch.last_inst;
        kvmppc_core_queue_program(vcpu, ESR_PIL);
        return RESUME_HOST;

    default:
        BUG();
    }
}

static void kvmppc_fill_pt_regs(struct pt_regs *regs)
{
    ulong r1, ip, msr, lr;

    asm("mr %0, 1" : "=r"(r1));
    asm("mflr %0" : "=r"(lr));
    asm("mfmsr %0" : "=r"(msr));
    asm("bl 1f; 1: mflr %0" : "=r"(ip));

    memset(regs, 0, sizeof(*regs));
    regs->gpr[1] = r1;
    regs->nip = ip;
    regs->msr = msr;
    regs->link = lr;
}

/*
 * For interrupts needed to be handled by host interrupt handlers,
 * corresponding host handler are called from here in similar way
 * (but not exact) as they are called from low level handler
 * (such as from arch/powerpc/kernel/head_fsl_booke.S).
 */
static void kvmppc_restart_interrupt(struct kvm_vcpu *vcpu,
                     unsigned int exit_nr)
{
    struct pt_regs regs;

    switch (exit_nr) {
    case BOOKE_INTERRUPT_EXTERNAL:
        kvmppc_fill_pt_regs(&regs);
        do_IRQ(&regs);
        break;
    case BOOKE_INTERRUPT_DECREMENTER:
        kvmppc_fill_pt_regs(&regs);
        timer_interrupt(&regs);
        break;
#if defined(CONFIG_PPC_FSL_BOOK3E) || defined(CONFIG_PPC_BOOK3E_64)
    case BOOKE_INTERRUPT_DOORBELL:
        kvmppc_fill_pt_regs(&regs);
        doorbell_exception(&regs);
        break;
#endif
    case BOOKE_INTERRUPT_MACHINE_CHECK:
        /* FIXME */
        break;
    case BOOKE_INTERRUPT_PERFORMANCE_MONITOR:
        kvmppc_fill_pt_regs(&regs);
        performance_monitor_exception(&regs);
        break;
    case BOOKE_INTERRUPT_WATCHDOG:
        kvmppc_fill_pt_regs(&regs);
#ifdef CONFIG_BOOKE_WDT
        WatchdogException(&regs);
#else
        unknown_exception(&regs);
#endif
        break;
    case BOOKE_INTERRUPT_CRITICAL:
        unknown_exception(&regs);
        break;
    }
}

int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
                       unsigned int exit_nr)
{
    int r = RESUME_HOST;

    /* update before a new last_exit_type is rewritten */
    kvmppc_update_timing_stats(vcpu);

    /* restart interrupts if they were meant for the host */
    kvmppc_restart_interrupt(vcpu, exit_nr);

    local_irq_enable();

    run->exit_reason = KVM_EXIT_UNKNOWN;
    run->ready_for_interrupt_injection = 1;

    switch (exit_nr) {
    case BOOKE_INTERRUPT_MACHINE_CHECK:
        printk("MACHINE CHECK: %lx\n", mfspr(SPRN_MCSR));
        kvmppc_dump_vcpu(vcpu);
        /* For debugging, send invalid exit reason to user space */
        run->hw.hardware_exit_reason = ~1ULL << 32;
        run->hw.hardware_exit_reason |= mfspr(SPRN_MCSR);
        r = RESUME_HOST;
        break;

    case BOOKE_INTERRUPT_EXTERNAL:
        kvmppc_account_exit(vcpu, EXT_INTR_EXITS);
        r = RESUME_GUEST;
        break;

    case BOOKE_INTERRUPT_DECREMENTER:
        kvmppc_account_exit(vcpu, DEC_EXITS);
        r = RESUME_GUEST;
        break;

    case BOOKE_INTERRUPT_WATCHDOG:
        r = RESUME_GUEST;
        break;

    case BOOKE_INTERRUPT_DOORBELL:
        kvmppc_account_exit(vcpu, DBELL_EXITS);
        r = RESUME_GUEST;
        break;

    case BOOKE_INTERRUPT_GUEST_DBELL_CRIT:
        kvmppc_account_exit(vcpu, GDBELL_EXITS);

        /*
         * We are here because there is a pending guest interrupt
         * which could not be delivered as MSR_CE or MSR_ME was not
         * set.  Once we break from here we will retry delivery.
         */
        r = RESUME_GUEST;
        break;

    case BOOKE_INTERRUPT_GUEST_DBELL:
        kvmppc_account_exit(vcpu, GDBELL_EXITS);

        /*
         * We are here because there is a pending guest interrupt
         * which could not be delivered as MSR_EE was not set.  Once
         * we break from here we will retry delivery.
         */
        r = RESUME_GUEST;
        break;

    case BOOKE_INTERRUPT_PERFORMANCE_MONITOR:
        r = RESUME_GUEST;
        break;

    case BOOKE_INTERRUPT_HV_PRIV:
        r = emulation_exit(run, vcpu);
        break;

    case BOOKE_INTERRUPT_PROGRAM:
        if (vcpu->arch.shared->msr & (MSR_PR | MSR_GS)) {
            /*
             * Program traps generated by user-level software must
             * be handled by the guest kernel.
             *
             * In GS mode, hypervisor privileged instructions trap
             * on BOOKE_INTERRUPT_HV_PRIV, not here, so these are
             * actual program interrupts, handled by the guest.
             */
            kvmppc_core_queue_program(vcpu, vcpu->arch.fault_esr);
            r = RESUME_GUEST;
            kvmppc_account_exit(vcpu, USR_PR_INST);
            break;
        }

        r = emulation_exit(run, vcpu);
        break;

    case BOOKE_INTERRUPT_FP_UNAVAIL:
        kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_FP_UNAVAIL);
        kvmppc_account_exit(vcpu, FP_UNAVAIL);
        r = RESUME_GUEST;
        break;

#ifdef CONFIG_SPE
    case BOOKE_INTERRUPT_SPE_UNAVAIL: {
        if (vcpu->arch.shared->msr & MSR_SPE)
            kvmppc_vcpu_enable_spe(vcpu);
        else
            kvmppc_booke_queue_irqprio(vcpu,
                           BOOKE_IRQPRIO_SPE_UNAVAIL);
        r = RESUME_GUEST;
        break;
    }

    case BOOKE_INTERRUPT_SPE_FP_DATA:
        kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SPE_FP_DATA);
        r = RESUME_GUEST;
        break;

    case BOOKE_INTERRUPT_SPE_FP_ROUND:
        kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SPE_FP_ROUND);
        r = RESUME_GUEST;
        break;
#else
    case BOOKE_INTERRUPT_SPE_UNAVAIL:
        /*
         * Guest wants SPE, but host kernel doesn't support it.  Send
         * an "unimplemented operation" program check to the guest.
         */
        kvmppc_core_queue_program(vcpu, ESR_PUO | ESR_SPV);
        r = RESUME_GUEST;
        break;

    /*
     * These really should never happen without CONFIG_SPE,
     * as we should never enable the real MSR[SPE] in the guest.
     */
    case BOOKE_INTERRUPT_SPE_FP_DATA:
    case BOOKE_INTERRUPT_SPE_FP_ROUND:
        printk(KERN_CRIT "%s: unexpected SPE interrupt %u at %08lx\n",
               __func__, exit_nr, vcpu->arch.pc);
        run->hw.hardware_exit_reason = exit_nr;
        r = RESUME_HOST;
        break;
#endif

    case BOOKE_INTERRUPT_DATA_STORAGE:
        kvmppc_core_queue_data_storage(vcpu, vcpu->arch.fault_dear,
                                       vcpu->arch.fault_esr);
        kvmppc_account_exit(vcpu, DSI_EXITS);
        r = RESUME_GUEST;
        break;

    case BOOKE_INTERRUPT_INST_STORAGE:
        kvmppc_core_queue_inst_storage(vcpu, vcpu->arch.fault_esr);
        kvmppc_account_exit(vcpu, ISI_EXITS);
        r = RESUME_GUEST;
        break;

#ifdef CONFIG_KVM_BOOKE_HV
    case BOOKE_INTERRUPT_HV_SYSCALL:
        if (!(vcpu->arch.shared->msr & MSR_PR)) {
            kvmppc_set_gpr(vcpu, 3, kvmppc_kvm_pv(vcpu));
        } else {
            /*
             * hcall from guest userspace -- send privileged
             * instruction program check.
             */
            kvmppc_core_queue_program(vcpu, ESR_PPR);
        }

        r = RESUME_GUEST;
        break;
#else
    case BOOKE_INTERRUPT_SYSCALL:
        if (!(vcpu->arch.shared->msr & MSR_PR) &&
            (((u32)kvmppc_get_gpr(vcpu, 0)) == KVM_SC_MAGIC_R0)) {
            /* KVM PV hypercalls */
            kvmppc_set_gpr(vcpu, 3, kvmppc_kvm_pv(vcpu));
            r = RESUME_GUEST;
        } else {
            /* Guest syscalls */
            kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SYSCALL);
        }
        kvmppc_account_exit(vcpu, SYSCALL_EXITS);
        r = RESUME_GUEST;
        break;
#endif

    case BOOKE_INTERRUPT_DTLB_MISS: {
        unsigned long eaddr = vcpu->arch.fault_dear;
        int gtlb_index;
        gpa_t gpaddr;
        gfn_t gfn;

#ifdef CONFIG_KVM_E500V2
        if (!(vcpu->arch.shared->msr & MSR_PR) &&
            (eaddr & PAGE_MASK) == vcpu->arch.magic_page_ea) {
            kvmppc_map_magic(vcpu);
            kvmppc_account_exit(vcpu, DTLB_VIRT_MISS_EXITS);
            r = RESUME_GUEST;

            break;
        }
#endif

        /* Check the guest TLB. */
        gtlb_index = kvmppc_mmu_dtlb_index(vcpu, eaddr);
        if (gtlb_index < 0) {
            /* The guest didn't have a mapping for it. */
            kvmppc_core_queue_dtlb_miss(vcpu,
                                        vcpu->arch.fault_dear,
                                        vcpu->arch.fault_esr);
            kvmppc_mmu_dtlb_miss(vcpu);
            kvmppc_account_exit(vcpu, DTLB_REAL_MISS_EXITS);
            r = RESUME_GUEST;
            break;
        }

        gpaddr = kvmppc_mmu_xlate(vcpu, gtlb_index, eaddr);
        gfn = gpaddr >> PAGE_SHIFT;

        if (kvm_is_visible_gfn(vcpu->kvm, gfn)) {
            /* The guest TLB had a mapping, but the shadow TLB
             * didn't, and it is RAM. This could be because:
             * a) the entry is mapping the host kernel, or
             * b) the guest used a large mapping which we're faking
             * Either way, we need to satisfy the fault without
             * invoking the guest. */
            kvmppc_mmu_map(vcpu, eaddr, gpaddr, gtlb_index);
            kvmppc_account_exit(vcpu, DTLB_VIRT_MISS_EXITS);
            r = RESUME_GUEST;
        } else {
            /* Guest has mapped and accessed a page which is not
             * actually RAM. */
            vcpu->arch.paddr_accessed = gpaddr;
            vcpu->arch.vaddr_accessed = eaddr;
            r = kvmppc_emulate_mmio(run, vcpu);
            kvmppc_account_exit(vcpu, MMIO_EXITS);
        }

        break;
    }

    case BOOKE_INTERRUPT_ITLB_MISS: {
        unsigned long eaddr = vcpu->arch.pc;
        gpa_t gpaddr;
        gfn_t gfn;
        int gtlb_index;

        r = RESUME_GUEST;

        /* Check the guest TLB. */
        gtlb_index = kvmppc_mmu_itlb_index(vcpu, eaddr);
        if (gtlb_index < 0) {
            /* The guest didn't have a mapping for it. */
            kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_ITLB_MISS);
            kvmppc_mmu_itlb_miss(vcpu);
            kvmppc_account_exit(vcpu, ITLB_REAL_MISS_EXITS);
            break;
        }

        kvmppc_account_exit(vcpu, ITLB_VIRT_MISS_EXITS);

        gpaddr = kvmppc_mmu_xlate(vcpu, gtlb_index, eaddr);
        gfn = gpaddr >> PAGE_SHIFT;

        if (kvm_is_visible_gfn(vcpu->kvm, gfn)) {
            /* The guest TLB had a mapping, but the shadow TLB
             * didn't. This could be because:
             * a) the entry is mapping the host kernel, or
             * b) the guest used a large mapping which we're faking
             * Either way, we need to satisfy the fault without
             * invoking the guest. */
            kvmppc_mmu_map(vcpu, eaddr, gpaddr, gtlb_index);
        } else {
            /* Guest mapped and leaped at non-RAM! */
            kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_MACHINE_CHECK);
        }

        break;
    }

    case BOOKE_INTERRUPT_DEBUG: {
        u32 dbsr;

        vcpu->arch.pc = mfspr(SPRN_CSRR0);

        /* clear IAC events in DBSR register */
        dbsr = mfspr(SPRN_DBSR);
        dbsr &= DBSR_IAC1 | DBSR_IAC2 | DBSR_IAC3 | DBSR_IAC4;
        mtspr(SPRN_DBSR, dbsr);

        run->exit_reason = KVM_EXIT_DEBUG;
        kvmppc_account_exit(vcpu, DEBUG_EXITS);
        r = RESUME_HOST;
        break;
    }

    default:
        printk(KERN_EMERG "exit_nr %d\n", exit_nr);
        BUG();
    }

    /*
     * To avoid clobbering exit_reason, only check for signals if we
     * aren't already exiting to userspace for some other reason.
     */
    if (!(r & RESUME_HOST)) {
        local_irq_disable();
        if (kvmppc_prepare_to_enter(vcpu)) {
            run->exit_reason = KVM_EXIT_INTR;
            r = (-EINTR << 2) | RESUME_HOST | (r & RESUME_FLAG_NV);
            kvmppc_account_exit(vcpu, SIGNAL_EXITS);
        }
    }

    return r;
}

/* Initial guest state: 16MB mapping 0 -> 0, PC = 0, MSR = 0, R1 = 16MB */
int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
{
    int i;
    int r;

    vcpu->arch.pc = 0;
    vcpu->arch.shared->pir = vcpu->vcpu_id;
    kvmppc_set_gpr(vcpu, 1, (16<<20) - 8); /* -8 for the callee-save LR slot */
    kvmppc_set_msr(vcpu, 0);

#ifndef CONFIG_KVM_BOOKE_HV
    vcpu->arch.shadow_msr = MSR_USER | MSR_DE | MSR_IS | MSR_DS;
    vcpu->arch.shadow_pid = 1;
    vcpu->arch.shared->msr = 0;
#endif

    /* Eye-catching numbers so we know if the guest takes an interrupt
     * before it's programmed its own IVPR/IVORs. */
    vcpu->arch.ivpr = 0x55550000;
    for (i = 0; i < BOOKE_IRQPRIO_MAX; i++)
        vcpu->arch.ivor[i] = 0x7700 | i * 4;

    kvmppc_init_timing_stats(vcpu);

    r = kvmppc_core_vcpu_setup(vcpu);
    kvmppc_sanity_check(vcpu);
    return r;
}

int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
    int i;

    regs->pc = vcpu->arch.pc;
    regs->cr = kvmppc_get_cr(vcpu);
    regs->ctr = vcpu->arch.ctr;
    regs->lr = vcpu->arch.lr;
    regs->xer = kvmppc_get_xer(vcpu);
    regs->msr = vcpu->arch.shared->msr;
    regs->srr0 = vcpu->arch.shared->srr0;
    regs->srr1 = vcpu->arch.shared->srr1;
    regs->pid = vcpu->arch.pid;
    regs->sprg0 = vcpu->arch.shared->sprg0;
    regs->sprg1 = vcpu->arch.shared->sprg1;
    regs->sprg2 = vcpu->arch.shared->sprg2;
    regs->sprg3 = vcpu->arch.shared->sprg3;
    regs->sprg4 = vcpu->arch.shared->sprg4;
    regs->sprg5 = vcpu->arch.shared->sprg5;
    regs->sprg6 = vcpu->arch.shared->sprg6;
    regs->sprg7 = vcpu->arch.shared->sprg7;

    for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
        regs->gpr[i] = kvmppc_get_gpr(vcpu, i);

    return 0;
}

int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
    int i;

    vcpu->arch.pc = regs->pc;
    kvmppc_set_cr(vcpu, regs->cr);
    vcpu->arch.ctr = regs->ctr;
    vcpu->arch.lr = regs->lr;
    kvmppc_set_xer(vcpu, regs->xer);
    kvmppc_set_msr(vcpu, regs->msr);
    vcpu->arch.shared->srr0 = regs->srr0;
    vcpu->arch.shared->srr1 = regs->srr1;
    kvmppc_set_pid(vcpu, regs->pid);
    vcpu->arch.shared->sprg0 = regs->sprg0;
    vcpu->arch.shared->sprg1 = regs->sprg1;
    vcpu->arch.shared->sprg2 = regs->sprg2;
    vcpu->arch.shared->sprg3 = regs->sprg3;
    vcpu->arch.shared->sprg4 = regs->sprg4;
    vcpu->arch.shared->sprg5 = regs->sprg5;
    vcpu->arch.shared->sprg6 = regs->sprg6;
    vcpu->arch.shared->sprg7 = regs->sprg7;

    for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
        kvmppc_set_gpr(vcpu, i, regs->gpr[i]);

    return 0;
}

static void get_sregs_base(struct kvm_vcpu *vcpu,
                           struct kvm_sregs *sregs)
{
    u64 tb = get_tb();

    sregs->u.e.features |= KVM_SREGS_E_BASE;

    sregs->u.e.csrr0 = vcpu->arch.csrr0;
    sregs->u.e.csrr1 = vcpu->arch.csrr1;
    sregs->u.e.mcsr = vcpu->arch.mcsr;
    sregs->u.e.esr = get_guest_esr(vcpu);
    sregs->u.e.dear = get_guest_dear(vcpu);
    sregs->u.e.tsr = vcpu->arch.tsr;
    sregs->u.e.tcr = vcpu->arch.tcr;
    sregs->u.e.dec = kvmppc_get_dec(vcpu, tb);
    sregs->u.e.tb = tb;
    sregs->u.e.vrsave = vcpu->arch.vrsave;
}

static int set_sregs_base(struct kvm_vcpu *vcpu,
                          struct kvm_sregs *sregs)
{
    if (!(sregs->u.e.features & KVM_SREGS_E_BASE))
        return 0;

    vcpu->arch.csrr0 = sregs->u.e.csrr0;
    vcpu->arch.csrr1 = sregs->u.e.csrr1;
    vcpu->arch.mcsr = sregs->u.e.mcsr;
    set_guest_esr(vcpu, sregs->u.e.esr);
    set_guest_dear(vcpu, sregs->u.e.dear);
    vcpu->arch.vrsave = sregs->u.e.vrsave;
    kvmppc_set_tcr(vcpu, sregs->u.e.tcr);

    if (sregs->u.e.update_special & KVM_SREGS_E_UPDATE_DEC) {
        vcpu->arch.dec = sregs->u.e.dec;
        kvmppc_emulate_dec(vcpu);
    }

    if (sregs->u.e.update_special & KVM_SREGS_E_UPDATE_TSR) {
        vcpu->arch.tsr = sregs->u.e.tsr;
        update_timer_ints(vcpu);
    }

    return 0;
}

static void get_sregs_arch206(struct kvm_vcpu *vcpu,
                              struct kvm_sregs *sregs)
{
    sregs->u.e.features |= KVM_SREGS_E_ARCH206;

    sregs->u.e.pir = vcpu->vcpu_id;
    sregs->u.e.mcsrr0 = vcpu->arch.mcsrr0;
    sregs->u.e.mcsrr1 = vcpu->arch.mcsrr1;
    sregs->u.e.decar = vcpu->arch.decar;
    sregs->u.e.ivpr = vcpu->arch.ivpr;
}

static int set_sregs_arch206(struct kvm_vcpu *vcpu,
                             struct kvm_sregs *sregs)
{
    if (!(sregs->u.e.features & KVM_SREGS_E_ARCH206))
        return 0;

    if (sregs->u.e.pir != vcpu->vcpu_id)
        return -EINVAL;

    vcpu->arch.mcsrr0 = sregs->u.e.mcsrr0;
    vcpu->arch.mcsrr1 = sregs->u.e.mcsrr1;
    vcpu->arch.decar = sregs->u.e.decar;
    vcpu->arch.ivpr = sregs->u.e.ivpr;

    return 0;
}

void kvmppc_get_sregs_ivor(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
{
    sregs->u.e.features |= KVM_SREGS_E_IVOR;

    sregs->u.e.ivor_low[0] = vcpu->arch.ivor[BOOKE_IRQPRIO_CRITICAL];
    sregs->u.e.ivor_low[1] = vcpu->arch.ivor[BOOKE_IRQPRIO_MACHINE_CHECK];
    sregs->u.e.ivor_low[2] = vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE];
    sregs->u.e.ivor_low[3] = vcpu->arch.ivor[BOOKE_IRQPRIO_INST_STORAGE];
    sregs->u.e.ivor_low[4] = vcpu->arch.ivor[BOOKE_IRQPRIO_EXTERNAL];
    sregs->u.e.ivor_low[5] = vcpu->arch.ivor[BOOKE_IRQPRIO_ALIGNMENT];
    sregs->u.e.ivor_low[6] = vcpu->arch.ivor[BOOKE_IRQPRIO_PROGRAM];
    sregs->u.e.ivor_low[7] = vcpu->arch.ivor[BOOKE_IRQPRIO_FP_UNAVAIL];
    sregs->u.e.ivor_low[8] = vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL];
    sregs->u.e.ivor_low[9] = vcpu->arch.ivor[BOOKE_IRQPRIO_AP_UNAVAIL];
    sregs->u.e.ivor_low[10] = vcpu->arch.ivor[BOOKE_IRQPRIO_DECREMENTER];
    sregs->u.e.ivor_low[11] = vcpu->arch.ivor[BOOKE_IRQPRIO_FIT];
    sregs->u.e.ivor_low[12] = vcpu->arch.ivor[BOOKE_IRQPRIO_WATCHDOG];
    sregs->u.e.ivor_low[13] = vcpu->arch.ivor[BOOKE_IRQPRIO_DTLB_MISS];
    sregs->u.e.ivor_low[14] = vcpu->arch.ivor[BOOKE_IRQPRIO_ITLB_MISS];
    sregs->u.e.ivor_low[15] = vcpu->arch.ivor[BOOKE_IRQPRIO_DEBUG];
}

int kvmppc_set_sregs_ivor(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
{
    if (!(sregs->u.e.features & KVM_SREGS_E_IVOR))
        return 0;

    vcpu->arch.ivor[BOOKE_IRQPRIO_CRITICAL] = sregs->u.e.ivor_low[0];
    vcpu->arch.ivor[BOOKE_IRQPRIO_MACHINE_CHECK] = sregs->u.e.ivor_low[1];
    vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE] = sregs->u.e.ivor_low[2];
    vcpu->arch.ivor[BOOKE_IRQPRIO_INST_STORAGE] = sregs->u.e.ivor_low[3];
    vcpu->arch.ivor[BOOKE_IRQPRIO_EXTERNAL] = sregs->u.e.ivor_low[4];
    vcpu->arch.ivor[BOOKE_IRQPRIO_ALIGNMENT] = sregs->u.e.ivor_low[5];
    vcpu->arch.ivor[BOOKE_IRQPRIO_PROGRAM] = sregs->u.e.ivor_low[6];
    vcpu->arch.ivor[BOOKE_IRQPRIO_FP_UNAVAIL] = sregs->u.e.ivor_low[7];
    vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL] = sregs->u.e.ivor_low[8];
    vcpu->arch.ivor[BOOKE_IRQPRIO_AP_UNAVAIL] = sregs->u.e.ivor_low[9];
    vcpu->arch.ivor[BOOKE_IRQPRIO_DECREMENTER] = sregs->u.e.ivor_low[10];
    vcpu->arch.ivor[BOOKE_IRQPRIO_FIT] = sregs->u.e.ivor_low[11];
    vcpu->arch.ivor[BOOKE_IRQPRIO_WATCHDOG] = sregs->u.e.ivor_low[12];
    vcpu->arch.ivor[BOOKE_IRQPRIO_DTLB_MISS] = sregs->u.e.ivor_low[13];
    vcpu->arch.ivor[BOOKE_IRQPRIO_ITLB_MISS] = sregs->u.e.ivor_low[14];
    vcpu->arch.ivor[BOOKE_IRQPRIO_DEBUG] = sregs->u.e.ivor_low[15];

    return 0;
}

int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
                                  struct kvm_sregs *sregs)
{
    sregs->pvr = vcpu->arch.pvr;

    get_sregs_base(vcpu, sregs);
    get_sregs_arch206(vcpu, sregs);
    kvmppc_core_get_sregs(vcpu, sregs);
    return 0;
}

int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
                                  struct kvm_sregs *sregs)
{
    int ret;

    if (vcpu->arch.pvr != sregs->pvr)
        return -EINVAL;

    ret = set_sregs_base(vcpu, sregs);
    if (ret < 0)
        return ret;

    ret = set_sregs_arch206(vcpu, sregs);
    if (ret < 0)
        return ret;

    return kvmppc_core_set_sregs(vcpu, sregs);
}

int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
{
    return -EINVAL;
}

int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
{
    return -EINVAL;
}

int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
    return -ENOTSUPP;
}

int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
    return -ENOTSUPP;
}

int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
                                  struct kvm_translation *tr)
{
    int r;

    r = kvmppc_core_vcpu_translate(vcpu, tr);
    return r;
}

int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
{
    return -ENOTSUPP;
}

int kvmppc_core_prepare_memory_region(struct kvm *kvm,
                      struct kvm_userspace_memory_region *mem)
{
    return 0;
}

void kvmppc_core_commit_memory_region(struct kvm *kvm,
                struct kvm_userspace_memory_region *mem)
{
}

void kvmppc_set_tcr(struct kvm_vcpu *vcpu, u32 new_tcr)
{
    vcpu->arch.tcr = new_tcr;
    update_timer_ints(vcpu);
}

void kvmppc_set_tsr_bits(struct kvm_vcpu *vcpu, u32 tsr_bits)
{
    set_bits(tsr_bits, &vcpu->arch.tsr);
    smp_wmb();
    kvm_make_request(KVM_REQ_PENDING_TIMER, vcpu);
    kvm_vcpu_kick(vcpu);
}

void kvmppc_clr_tsr_bits(struct kvm_vcpu *vcpu, u32 tsr_bits)
{
    clear_bits(tsr_bits, &vcpu->arch.tsr);
    update_timer_ints(vcpu);
}

void kvmppc_decrementer_func(unsigned long data)
{
    struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;

    if (vcpu->arch.tcr & TCR_ARE) {
        vcpu->arch.dec = vcpu->arch.decar;
        kvmppc_emulate_dec(vcpu);
    }

    kvmppc_set_tsr_bits(vcpu, TSR_DIS);
}

void kvmppc_booke_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
    current->thread.kvm_vcpu = vcpu;
}

void kvmppc_booke_vcpu_put(struct kvm_vcpu *vcpu)
{
    current->thread.kvm_vcpu = NULL;
}

int __init kvmppc_booke_init(void)
{
#ifndef CONFIG_KVM_BOOKE_HV
    unsigned long ivor[16];
    unsigned long max_ivor = 0;
    int i;

    /* We install our own exception handlers by hijacking IVPR. IVPR must
     * be 16-bit aligned, so we need a 64KB allocation. */
    kvmppc_booke_handlers = __get_free_pages(GFP_KERNEL | __GFP_ZERO,
                                             VCPU_SIZE_ORDER);
    if (!kvmppc_booke_handlers)
        return -ENOMEM;

    /* XXX make sure our handlers are smaller than Linux's */

    /* Copy our interrupt handlers to match host IVORs. That way we don't
     * have to swap the IVORs on every guest/host transition. */
    ivor[0] = mfspr(SPRN_IVOR0);
    ivor[1] = mfspr(SPRN_IVOR1);
    ivor[2] = mfspr(SPRN_IVOR2);
    ivor[3] = mfspr(SPRN_IVOR3);
    ivor[4] = mfspr(SPRN_IVOR4);
    ivor[5] = mfspr(SPRN_IVOR5);
    ivor[6] = mfspr(SPRN_IVOR6);
    ivor[7] = mfspr(SPRN_IVOR7);
    ivor[8] = mfspr(SPRN_IVOR8);
    ivor[9] = mfspr(SPRN_IVOR9);
    ivor[10] = mfspr(SPRN_IVOR10);
    ivor[11] = mfspr(SPRN_IVOR11);
    ivor[12] = mfspr(SPRN_IVOR12);
    ivor[13] = mfspr(SPRN_IVOR13);
    ivor[14] = mfspr(SPRN_IVOR14);
    ivor[15] = mfspr(SPRN_IVOR15);

    for (i = 0; i < 16; i++) {
        if (ivor[i] > max_ivor)
            max_ivor = ivor[i];

        memcpy((void *)kvmppc_booke_handlers + ivor[i],
               kvmppc_handlers_start + i * kvmppc_handler_len,
               kvmppc_handler_len);
    }
    flush_icache_range(kvmppc_booke_handlers,
                       kvmppc_booke_handlers + max_ivor + kvmppc_handler_len);
#endif /* !BOOKE_HV */
    return 0;
}

void __exit kvmppc_booke_exit(void)
{
    free_pages(kvmppc_booke_handlers, VCPU_SIZE_ORDER);
    kvm_exit();
}