kvm-ia64.c

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/*
 * kvm_ia64.c: Basic KVM suppport On Itanium series processors
 *
 *
 *  Copyright (C) 2007, Intel Corporation.
 *      Xiantao Zhang  ([email protected])
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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, Inc., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307 USA.
 *
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/percpu.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/kvm_host.h>
#include <linux/kvm.h>
#include <linux/bitops.h>
#include <linux/hrtimer.h>
#include <linux/uaccess.h>
#include <linux/iommu.h>
#include <linux/intel-iommu.h>
#include <linux/pci.h>

#include <asm/pgtable.h>
#include <asm/gcc_intrin.h>
#include <asm/pal.h>
#include <asm/cacheflush.h>
#include <asm/div64.h>
#include <asm/tlb.h>
#include <asm/elf.h>
#include <asm/sn/addrs.h>
#include <asm/sn/clksupport.h>
#include <asm/sn/shub_mmr.h>

#include "misc.h"
#include "vti.h"
#include "iodev.h"
#include "ioapic.h"
#include "lapic.h"
#include "irq.h"

static unsigned long kvm_vmm_base;
static unsigned long kvm_vsa_base;
static unsigned long kvm_vm_buffer;
static unsigned long kvm_vm_buffer_size;
unsigned long kvm_vmm_gp;

static long vp_env_info;

static struct kvm_vmm_info *kvm_vmm_info;

static DEFINE_PER_CPU(struct kvm_vcpu *, last_vcpu);

struct kvm_stats_debugfs_item debugfs_entries[] = {
    { NULL }
};

static unsigned long kvm_get_itc(struct kvm_vcpu *vcpu)
{
#if defined(CONFIG_IA64_SGI_SN2) || defined(CONFIG_IA64_GENERIC)
    if (vcpu->kvm->arch.is_sn2)
        return rtc_time();
    else
#endif
        return ia64_getreg(_IA64_REG_AR_ITC);
}

static void kvm_flush_icache(unsigned long start, unsigned long len)
{
    int l;

    for (l = 0; l < (len + 32); l += 32)
        ia64_fc((void *)(start + l));

    ia64_sync_i();
    ia64_srlz_i();
}

static void kvm_flush_tlb_all(void)
{
    unsigned long i, j, count0, count1, stride0, stride1, addr;
    long flags;

    addr    = local_cpu_data->ptce_base;
    count0  = local_cpu_data->ptce_count[0];
    count1  = local_cpu_data->ptce_count[1];
    stride0 = local_cpu_data->ptce_stride[0];
    stride1 = local_cpu_data->ptce_stride[1];

    local_irq_save(flags);
    for (i = 0; i < count0; ++i) {
        for (j = 0; j < count1; ++j) {
            ia64_ptce(addr);
            addr += stride1;
        }
        addr += stride0;
    }
    local_irq_restore(flags);
    ia64_srlz_i();          /* srlz.i implies srlz.d */
}

long ia64_pal_vp_create(u64 *vpd, u64 *host_iva, u64 *opt_handler)
{
    struct ia64_pal_retval iprv;

    PAL_CALL_STK(iprv, PAL_VP_CREATE, (u64)vpd, (u64)host_iva,
            (u64)opt_handler);

    return iprv.status;
}

static  DEFINE_SPINLOCK(vp_lock);

int kvm_arch_hardware_enable(void *garbage)
{
    long  status;
    long  tmp_base;
    unsigned long pte;
    unsigned long saved_psr;
    int slot;

    pte = pte_val(mk_pte_phys(__pa(kvm_vmm_base), PAGE_KERNEL));
    local_irq_save(saved_psr);
    slot = ia64_itr_entry(0x3, KVM_VMM_BASE, pte, KVM_VMM_SHIFT);
    local_irq_restore(saved_psr);
    if (slot < 0)
        return -EINVAL;

    spin_lock(&vp_lock);
    status = ia64_pal_vp_init_env(kvm_vsa_base ?
                VP_INIT_ENV : VP_INIT_ENV_INITALIZE,
            __pa(kvm_vm_buffer), KVM_VM_BUFFER_BASE, &tmp_base);
    if (status != 0) {
        spin_unlock(&vp_lock);
        printk(KERN_WARNING"kvm: Failed to Enable VT Support!!!!\n");
        return -EINVAL;
    }

    if (!kvm_vsa_base) {
        kvm_vsa_base = tmp_base;
        printk(KERN_INFO"kvm: kvm_vsa_base:0x%lx\n", kvm_vsa_base);
    }
    spin_unlock(&vp_lock);
    ia64_ptr_entry(0x3, slot);

    return 0;
}

void kvm_arch_hardware_disable(void *garbage)
{

    long status;
    int slot;
    unsigned long pte;
    unsigned long saved_psr;
    unsigned long host_iva = ia64_getreg(_IA64_REG_CR_IVA);

    pte = pte_val(mk_pte_phys(__pa(kvm_vmm_base),
                PAGE_KERNEL));

    local_irq_save(saved_psr);
    slot = ia64_itr_entry(0x3, KVM_VMM_BASE, pte, KVM_VMM_SHIFT);
    local_irq_restore(saved_psr);
    if (slot < 0)
        return;

    status = ia64_pal_vp_exit_env(host_iva);
    if (status)
        printk(KERN_DEBUG"kvm: Failed to disable VT support! :%ld\n",
                status);
    ia64_ptr_entry(0x3, slot);
}

void kvm_arch_check_processor_compat(void *rtn)
{
    *(int *)rtn = 0;
}

int kvm_dev_ioctl_check_extension(long ext)
{

    int r;

    switch (ext) {
    case KVM_CAP_IRQCHIP:
    case KVM_CAP_MP_STATE:
    case KVM_CAP_IRQ_INJECT_STATUS:
        r = 1;
        break;
    case KVM_CAP_COALESCED_MMIO:
        r = KVM_COALESCED_MMIO_PAGE_OFFSET;
        break;
    case KVM_CAP_IOMMU:
        r = iommu_present(&pci_bus_type);
        break;
    default:
        r = 0;
    }
    return r;

}

static int handle_vm_error(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
    kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
    kvm_run->hw.hardware_exit_reason = 1;
    return 0;
}

static int handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
    struct kvm_mmio_req *p;
    struct kvm_io_device *mmio_dev;
    int r;

    p = kvm_get_vcpu_ioreq(vcpu);

    if ((p->addr & PAGE_MASK) == IOAPIC_DEFAULT_BASE_ADDRESS)
        goto mmio;
    vcpu->mmio_needed = 1;
    vcpu->mmio_fragments[0].gpa = kvm_run->mmio.phys_addr = p->addr;
    vcpu->mmio_fragments[0].len = kvm_run->mmio.len = p->size;
    vcpu->mmio_is_write = kvm_run->mmio.is_write = !p->dir;

    if (vcpu->mmio_is_write)
        memcpy(vcpu->arch.mmio_data, &p->data, p->size);
    memcpy(kvm_run->mmio.data, &p->data, p->size);
    kvm_run->exit_reason = KVM_EXIT_MMIO;
    return 0;
mmio:
    if (p->dir)
        r = kvm_io_bus_read(vcpu->kvm, KVM_MMIO_BUS, p->addr,
                    p->size, &p->data);
    else
        r = kvm_io_bus_write(vcpu->kvm, KVM_MMIO_BUS, p->addr,
                     p->size, &p->data);
    if (r)
        printk(KERN_ERR"kvm: No iodevice found! addr:%lx\n", p->addr);
    p->state = STATE_IORESP_READY;

    return 1;
}

static int handle_pal_call(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
    struct exit_ctl_data *p;

    p = kvm_get_exit_data(vcpu);

    if (p->exit_reason == EXIT_REASON_PAL_CALL)
        return kvm_pal_emul(vcpu, kvm_run);
    else {
        kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
        kvm_run->hw.hardware_exit_reason = 2;
        return 0;
    }
}

static int handle_sal_call(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
    struct exit_ctl_data *p;

    p = kvm_get_exit_data(vcpu);

    if (p->exit_reason == EXIT_REASON_SAL_CALL) {
        kvm_sal_emul(vcpu);
        return 1;
    } else {
        kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
        kvm_run->hw.hardware_exit_reason = 3;
        return 0;
    }

}

static int __apic_accept_irq(struct kvm_vcpu *vcpu, uint64_t vector)
{
    struct vpd *vpd = to_host(vcpu->kvm, vcpu->arch.vpd);

    if (!test_and_set_bit(vector, &vpd->irr[0])) {
        vcpu->arch.irq_new_pending = 1;
        kvm_vcpu_kick(vcpu);
        return 1;
    }
    return 0;
}

/*
 *  offset: address offset to IPI space.
 *  value:  deliver value.
 */
static void vcpu_deliver_ipi(struct kvm_vcpu *vcpu, uint64_t dm,
                uint64_t vector)
{
    switch (dm) {
    case SAPIC_FIXED:
        break;
    case SAPIC_NMI:
        vector = 2;
        break;
    case SAPIC_EXTINT:
        vector = 0;
        break;
    case SAPIC_INIT:
    case SAPIC_PMI:
    default:
        printk(KERN_ERR"kvm: Unimplemented Deliver reserved IPI!\n");
        return;
    }
    __apic_accept_irq(vcpu, vector);
}

static struct kvm_vcpu *lid_to_vcpu(struct kvm *kvm, unsigned long id,
            unsigned long eid)
{
    union ia64_lid lid;
    int i;
    struct kvm_vcpu *vcpu;

    kvm_for_each_vcpu(i, vcpu, kvm) {
        lid.val = VCPU_LID(vcpu);
        if (lid.id == id && lid.eid == eid)
            return vcpu;
    }

    return NULL;
}

static int handle_ipi(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
    struct exit_ctl_data *p = kvm_get_exit_data(vcpu);
    struct kvm_vcpu *target_vcpu;
    struct kvm_pt_regs *regs;
    union ia64_ipi_a addr = p->u.ipi_data.addr;
    union ia64_ipi_d data = p->u.ipi_data.data;

    target_vcpu = lid_to_vcpu(vcpu->kvm, addr.id, addr.eid);
    if (!target_vcpu)
        return handle_vm_error(vcpu, kvm_run);

    if (!target_vcpu->arch.launched) {
        regs = vcpu_regs(target_vcpu);

        regs->cr_iip = vcpu->kvm->arch.rdv_sal_data.boot_ip;
        regs->r1 = vcpu->kvm->arch.rdv_sal_data.boot_gp;

        target_vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
        if (waitqueue_active(&target_vcpu->wq))
            wake_up_interruptible(&target_vcpu->wq);
    } else {
        vcpu_deliver_ipi(target_vcpu, data.dm, data.vector);
        if (target_vcpu != vcpu)
            kvm_vcpu_kick(target_vcpu);
    }

    return 1;
}

struct call_data {
    struct kvm_ptc_g ptc_g_data;
    struct kvm_vcpu *vcpu;
};

static void vcpu_global_purge(void *info)
{
    struct call_data *p = (struct call_data *)info;
    struct kvm_vcpu *vcpu = p->vcpu;

    if (test_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
        return;

    set_bit(KVM_REQ_PTC_G, &vcpu->requests);
    if (vcpu->arch.ptc_g_count < MAX_PTC_G_NUM) {
        vcpu->arch.ptc_g_data[vcpu->arch.ptc_g_count++] =
                            p->ptc_g_data;
    } else {
        clear_bit(KVM_REQ_PTC_G, &vcpu->requests);
        vcpu->arch.ptc_g_count = 0;
        set_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests);
    }
}

static int handle_global_purge(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
    struct exit_ctl_data *p = kvm_get_exit_data(vcpu);
    struct kvm *kvm = vcpu->kvm;
    struct call_data call_data;
    int i;
    struct kvm_vcpu *vcpui;

    call_data.ptc_g_data = p->u.ptc_g_data;

    kvm_for_each_vcpu(i, vcpui, kvm) {
        if (vcpui->arch.mp_state == KVM_MP_STATE_UNINITIALIZED ||
                vcpu == vcpui)
            continue;

        if (waitqueue_active(&vcpui->wq))
            wake_up_interruptible(&vcpui->wq);

        if (vcpui->cpu != -1) {
            call_data.vcpu = vcpui;
            smp_call_function_single(vcpui->cpu,
                    vcpu_global_purge, &call_data, 1);
        } else
            printk(KERN_WARNING"kvm: Uninit vcpu received ipi!\n");

    }
    return 1;
}

static int handle_switch_rr6(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
    return 1;
}

static int kvm_sn2_setup_mappings(struct kvm_vcpu *vcpu)
{
    unsigned long pte, rtc_phys_addr, map_addr;
    int slot;

    map_addr = KVM_VMM_BASE + (1UL << KVM_VMM_SHIFT);
    rtc_phys_addr = LOCAL_MMR_OFFSET | SH_RTC;
    pte = pte_val(mk_pte_phys(rtc_phys_addr, PAGE_KERNEL_UC));
    slot = ia64_itr_entry(0x3, map_addr, pte, PAGE_SHIFT);
    vcpu->arch.sn_rtc_tr_slot = slot;
    if (slot < 0) {
        printk(KERN_ERR "Mayday mayday! RTC mapping failed!\n");
        slot = 0;
    }
    return slot;
}

int kvm_emulate_halt(struct kvm_vcpu *vcpu)
{

    ktime_t kt;
    long itc_diff;
    unsigned long vcpu_now_itc;
    unsigned long expires;
    struct hrtimer *p_ht = &vcpu->arch.hlt_timer;
    unsigned long cyc_per_usec = local_cpu_data->cyc_per_usec;
    struct vpd *vpd = to_host(vcpu->kvm, vcpu->arch.vpd);

    if (irqchip_in_kernel(vcpu->kvm)) {

        vcpu_now_itc = kvm_get_itc(vcpu) + vcpu->arch.itc_offset;

        if (time_after(vcpu_now_itc, vpd->itm)) {
            vcpu->arch.timer_check = 1;
            return 1;
        }
        itc_diff = vpd->itm - vcpu_now_itc;
        if (itc_diff < 0)
            itc_diff = -itc_diff;

        expires = div64_u64(itc_diff, cyc_per_usec);
        kt = ktime_set(0, 1000 * expires);

        vcpu->arch.ht_active = 1;
        hrtimer_start(p_ht, kt, HRTIMER_MODE_ABS);

        vcpu->arch.mp_state = KVM_MP_STATE_HALTED;
        kvm_vcpu_block(vcpu);
        hrtimer_cancel(p_ht);
        vcpu->arch.ht_active = 0;

        if (test_and_clear_bit(KVM_REQ_UNHALT, &vcpu->requests) ||
                kvm_cpu_has_pending_timer(vcpu))
            if (vcpu->arch.mp_state == KVM_MP_STATE_HALTED)
                vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;

        if (vcpu->arch.mp_state != KVM_MP_STATE_RUNNABLE)
            return -EINTR;
        return 1;
    } else {
        printk(KERN_ERR"kvm: Unsupported userspace halt!");
        return 0;
    }
}

static int handle_vm_shutdown(struct kvm_vcpu *vcpu,
        struct kvm_run *kvm_run)
{
    kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
    return 0;
}

static int handle_external_interrupt(struct kvm_vcpu *vcpu,
        struct kvm_run *kvm_run)
{
    return 1;
}

static int handle_vcpu_debug(struct kvm_vcpu *vcpu,
                struct kvm_run *kvm_run)
{
    printk("VMM: %s", vcpu->arch.log_buf);
    return 1;
}

static int (*kvm_vti_exit_handlers[])(struct kvm_vcpu *vcpu,
        struct kvm_run *kvm_run) = {
    [EXIT_REASON_VM_PANIC]              = handle_vm_error,
    [EXIT_REASON_MMIO_INSTRUCTION]      = handle_mmio,
    [EXIT_REASON_PAL_CALL]              = handle_pal_call,
    [EXIT_REASON_SAL_CALL]              = handle_sal_call,
    [EXIT_REASON_SWITCH_RR6]            = handle_switch_rr6,
    [EXIT_REASON_VM_DESTROY]            = handle_vm_shutdown,
    [EXIT_REASON_EXTERNAL_INTERRUPT]    = handle_external_interrupt,
    [EXIT_REASON_IPI]           = handle_ipi,
    [EXIT_REASON_PTC_G]         = handle_global_purge,
    [EXIT_REASON_DEBUG]         = handle_vcpu_debug,

};

static const int kvm_vti_max_exit_handlers =
        sizeof(kvm_vti_exit_handlers)/sizeof(*kvm_vti_exit_handlers);

static uint32_t kvm_get_exit_reason(struct kvm_vcpu *vcpu)
{
    struct exit_ctl_data *p_exit_data;

    p_exit_data = kvm_get_exit_data(vcpu);
    return p_exit_data->exit_reason;
}

/*
 * The guest has exited.  See if we can fix it or if we need userspace
 * assistance.
 */
static int kvm_handle_exit(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
{
    u32 exit_reason = kvm_get_exit_reason(vcpu);
    vcpu->arch.last_exit = exit_reason;

    if (exit_reason < kvm_vti_max_exit_handlers
            && kvm_vti_exit_handlers[exit_reason])
        return kvm_vti_exit_handlers[exit_reason](vcpu, kvm_run);
    else {
        kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
        kvm_run->hw.hardware_exit_reason = exit_reason;
    }
    return 0;
}

static inline void vti_set_rr6(unsigned long rr6)
{
    ia64_set_rr(RR6, rr6);
    ia64_srlz_i();
}

static int kvm_insert_vmm_mapping(struct kvm_vcpu *vcpu)
{
    unsigned long pte;
    struct kvm *kvm = vcpu->kvm;
    int r;

    /*Insert a pair of tr to map vmm*/
    pte = pte_val(mk_pte_phys(__pa(kvm_vmm_base), PAGE_KERNEL));
    r = ia64_itr_entry(0x3, KVM_VMM_BASE, pte, KVM_VMM_SHIFT);
    if (r < 0)
        goto out;
    vcpu->arch.vmm_tr_slot = r;
    /*Insert a pairt of tr to map data of vm*/
    pte = pte_val(mk_pte_phys(__pa(kvm->arch.vm_base), PAGE_KERNEL));
    r = ia64_itr_entry(0x3, KVM_VM_DATA_BASE,
                    pte, KVM_VM_DATA_SHIFT);
    if (r < 0)
        goto out;
    vcpu->arch.vm_tr_slot = r;

#if defined(CONFIG_IA64_SGI_SN2) || defined(CONFIG_IA64_GENERIC)
    if (kvm->arch.is_sn2) {
        r = kvm_sn2_setup_mappings(vcpu);
        if (r < 0)
            goto out;
    }
#endif

    r = 0;
out:
    return r;
}

static void kvm_purge_vmm_mapping(struct kvm_vcpu *vcpu)
{
    struct kvm *kvm = vcpu->kvm;
    ia64_ptr_entry(0x3, vcpu->arch.vmm_tr_slot);
    ia64_ptr_entry(0x3, vcpu->arch.vm_tr_slot);
#if defined(CONFIG_IA64_SGI_SN2) || defined(CONFIG_IA64_GENERIC)
    if (kvm->arch.is_sn2)
        ia64_ptr_entry(0x3, vcpu->arch.sn_rtc_tr_slot);
#endif
}

static int kvm_vcpu_pre_transition(struct kvm_vcpu *vcpu)
{
    unsigned long psr;
    int r;
    int cpu = smp_processor_id();

    if (vcpu->arch.last_run_cpu != cpu ||
            per_cpu(last_vcpu, cpu) != vcpu) {
        per_cpu(last_vcpu, cpu) = vcpu;
        vcpu->arch.last_run_cpu = cpu;
        kvm_flush_tlb_all();
    }

    vcpu->arch.host_rr6 = ia64_get_rr(RR6);
    vti_set_rr6(vcpu->arch.vmm_rr);
    local_irq_save(psr);
    r = kvm_insert_vmm_mapping(vcpu);
    local_irq_restore(psr);
    return r;
}

static void kvm_vcpu_post_transition(struct kvm_vcpu *vcpu)
{
    kvm_purge_vmm_mapping(vcpu);
    vti_set_rr6(vcpu->arch.host_rr6);
}

static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
    union context *host_ctx, *guest_ctx;
    int r, idx;

    idx = srcu_read_lock(&vcpu->kvm->srcu);

again:
    if (signal_pending(current)) {
        r = -EINTR;
        kvm_run->exit_reason = KVM_EXIT_INTR;
        goto out;
    }

    preempt_disable();
    local_irq_disable();

    /*Get host and guest context with guest address space.*/
    host_ctx = kvm_get_host_context(vcpu);
    guest_ctx = kvm_get_guest_context(vcpu);

    clear_bit(KVM_REQ_KICK, &vcpu->requests);

    r = kvm_vcpu_pre_transition(vcpu);
    if (r < 0)
        goto vcpu_run_fail;

    srcu_read_unlock(&vcpu->kvm->srcu, idx);
    vcpu->mode = IN_GUEST_MODE;
    kvm_guest_enter();

    /*
     * Transition to the guest
     */
    kvm_vmm_info->tramp_entry(host_ctx, guest_ctx);

    kvm_vcpu_post_transition(vcpu);

    vcpu->arch.launched = 1;
    set_bit(KVM_REQ_KICK, &vcpu->requests);
    local_irq_enable();

    /*
     * We must have an instruction between local_irq_enable() and
     * kvm_guest_exit(), so the timer interrupt isn't delayed by
     * the interrupt shadow.  The stat.exits increment will do nicely.
     * But we need to prevent reordering, hence this barrier():
     */
    barrier();
    kvm_guest_exit();
    vcpu->mode = OUTSIDE_GUEST_MODE;
    preempt_enable();

    idx = srcu_read_lock(&vcpu->kvm->srcu);

    r = kvm_handle_exit(kvm_run, vcpu);

    if (r > 0) {
        if (!need_resched())
            goto again;
    }

out:
    srcu_read_unlock(&vcpu->kvm->srcu, idx);
    if (r > 0) {
        kvm_resched(vcpu);
        idx = srcu_read_lock(&vcpu->kvm->srcu);
        goto again;
    }

    return r;

vcpu_run_fail:
    local_irq_enable();
    preempt_enable();
    kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
    goto out;
}

static void kvm_set_mmio_data(struct kvm_vcpu *vcpu)
{
    struct kvm_mmio_req *p = kvm_get_vcpu_ioreq(vcpu);

    if (!vcpu->mmio_is_write)
        memcpy(&p->data, vcpu->arch.mmio_data, 8);
    p->state = STATE_IORESP_READY;
}

int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
    int r;
    sigset_t sigsaved;

    if (vcpu->sigset_active)
        sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);

    if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) {
        kvm_vcpu_block(vcpu);
        clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
        r = -EAGAIN;
        goto out;
    }

    if (vcpu->mmio_needed) {
        memcpy(vcpu->arch.mmio_data, kvm_run->mmio.data, 8);
        kvm_set_mmio_data(vcpu);
        vcpu->mmio_read_completed = 1;
        vcpu->mmio_needed = 0;
    }
    r = __vcpu_run(vcpu, kvm_run);
out:
    if (vcpu->sigset_active)
        sigprocmask(SIG_SETMASK, &sigsaved, NULL);

    return r;
}

struct kvm *kvm_arch_alloc_vm(void)
{

    struct kvm *kvm;
    uint64_t  vm_base;

    BUG_ON(sizeof(struct kvm) > KVM_VM_STRUCT_SIZE);

    vm_base = __get_free_pages(GFP_KERNEL, get_order(KVM_VM_DATA_SIZE));

    if (!vm_base)
        return NULL;

    memset((void *)vm_base, 0, KVM_VM_DATA_SIZE);
    kvm = (struct kvm *)(vm_base +
            offsetof(struct kvm_vm_data, kvm_vm_struct));
    kvm->arch.vm_base = vm_base;
    printk(KERN_DEBUG"kvm: vm's data area:0x%lx\n", vm_base);

    return kvm;
}

struct kvm_ia64_io_range {
    unsigned long start;
    unsigned long size;
    unsigned long type;
};

static const struct kvm_ia64_io_range io_ranges[] = {
    {VGA_IO_START, VGA_IO_SIZE, GPFN_FRAME_BUFFER},
    {MMIO_START, MMIO_SIZE, GPFN_LOW_MMIO},
    {LEGACY_IO_START, LEGACY_IO_SIZE, GPFN_LEGACY_IO},
    {IO_SAPIC_START, IO_SAPIC_SIZE, GPFN_IOSAPIC},
    {PIB_START, PIB_SIZE, GPFN_PIB},
};

static void kvm_build_io_pmt(struct kvm *kvm)
{
    unsigned long i, j;

    /* Mark I/O ranges */
    for (i = 0; i < (sizeof(io_ranges) / sizeof(struct kvm_io_range));
                            i++) {
        for (j = io_ranges[i].start;
                j < io_ranges[i].start + io_ranges[i].size;
                j += PAGE_SIZE)
            kvm_set_pmt_entry(kvm, j >> PAGE_SHIFT,
                    io_ranges[i].type, 0);
    }

}

/*Use unused rids to virtualize guest rid.*/
#define GUEST_PHYSICAL_RR0  0x1739
#define GUEST_PHYSICAL_RR4  0x2739
#define VMM_INIT_RR     0x1660

int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
{
    BUG_ON(!kvm);

    if (type)
        return -EINVAL;

    kvm->arch.is_sn2 = ia64_platform_is("sn2");

    kvm->arch.metaphysical_rr0 = GUEST_PHYSICAL_RR0;
    kvm->arch.metaphysical_rr4 = GUEST_PHYSICAL_RR4;
    kvm->arch.vmm_init_rr = VMM_INIT_RR;

    /*
     *Fill P2M entries for MMIO/IO ranges
     */
    kvm_build_io_pmt(kvm);

    INIT_LIST_HEAD(&kvm->arch.assigned_dev_head);

    /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */
    set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap);

    return 0;
}

static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm,
                    struct kvm_irqchip *chip)
{
    int r;

    r = 0;
    switch (chip->chip_id) {
    case KVM_IRQCHIP_IOAPIC:
        r = kvm_get_ioapic(kvm, &chip->chip.ioapic);
        break;
    default:
        r = -EINVAL;
        break;
    }
    return r;
}

static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
{
    int r;

    r = 0;
    switch (chip->chip_id) {
    case KVM_IRQCHIP_IOAPIC:
        r = kvm_set_ioapic(kvm, &chip->chip.ioapic);
        break;
    default:
        r = -EINVAL;
        break;
    }
    return r;
}

#define RESTORE_REGS(_x) vcpu->arch._x = regs->_x

int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
    struct vpd *vpd = to_host(vcpu->kvm, vcpu->arch.vpd);
    int i;

    for (i = 0; i < 16; i++) {
        vpd->vgr[i] = regs->vpd.vgr[i];
        vpd->vbgr[i] = regs->vpd.vbgr[i];
    }
    for (i = 0; i < 128; i++)
        vpd->vcr[i] = regs->vpd.vcr[i];
    vpd->vhpi = regs->vpd.vhpi;
    vpd->vnat = regs->vpd.vnat;
    vpd->vbnat = regs->vpd.vbnat;
    vpd->vpsr = regs->vpd.vpsr;

    vpd->vpr = regs->vpd.vpr;

    memcpy(&vcpu->arch.guest, &regs->saved_guest, sizeof(union context));

    RESTORE_REGS(mp_state);
    RESTORE_REGS(vmm_rr);
    memcpy(vcpu->arch.itrs, regs->itrs, sizeof(struct thash_data) * NITRS);
    memcpy(vcpu->arch.dtrs, regs->dtrs, sizeof(struct thash_data) * NDTRS);
    RESTORE_REGS(itr_regions);
    RESTORE_REGS(dtr_regions);
    RESTORE_REGS(tc_regions);
    RESTORE_REGS(irq_check);
    RESTORE_REGS(itc_check);
    RESTORE_REGS(timer_check);
    RESTORE_REGS(timer_pending);
    RESTORE_REGS(last_itc);
    for (i = 0; i < 8; i++) {
        vcpu->arch.vrr[i] = regs->vrr[i];
        vcpu->arch.ibr[i] = regs->ibr[i];
        vcpu->arch.dbr[i] = regs->dbr[i];
    }
    for (i = 0; i < 4; i++)
        vcpu->arch.insvc[i] = regs->insvc[i];
    RESTORE_REGS(xtp);
    RESTORE_REGS(metaphysical_rr0);
    RESTORE_REGS(metaphysical_rr4);
    RESTORE_REGS(metaphysical_saved_rr0);
    RESTORE_REGS(metaphysical_saved_rr4);
    RESTORE_REGS(fp_psr);
    RESTORE_REGS(saved_gp);

    vcpu->arch.irq_new_pending = 1;
    vcpu->arch.itc_offset = regs->saved_itc - kvm_get_itc(vcpu);
    set_bit(KVM_REQ_RESUME, &vcpu->requests);

    return 0;
}

int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_event)
{
    if (!irqchip_in_kernel(kvm))
        return -ENXIO;

    irq_event->status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
                    irq_event->irq, irq_event->level);
    return 0;
}

long kvm_arch_vm_ioctl(struct file *filp,
        unsigned int ioctl, unsigned long arg)
{
    struct kvm *kvm = filp->private_data;
    void __user *argp = (void __user *)arg;
    int r = -ENOTTY;

    switch (ioctl) {
    case KVM_SET_MEMORY_REGION: {
        struct kvm_memory_region kvm_mem;
        struct kvm_userspace_memory_region kvm_userspace_mem;

        r = -EFAULT;
        if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
            goto out;
        kvm_userspace_mem.slot = kvm_mem.slot;
        kvm_userspace_mem.flags = kvm_mem.flags;
        kvm_userspace_mem.guest_phys_addr =
                    kvm_mem.guest_phys_addr;
        kvm_userspace_mem.memory_size = kvm_mem.memory_size;
        r = kvm_vm_ioctl_set_memory_region(kvm,
                    &kvm_userspace_mem, 0);
        if (r)
            goto out;
        break;
        }
    case KVM_CREATE_IRQCHIP:
        r = -EFAULT;
        r = kvm_ioapic_init(kvm);
        if (r)
            goto out;
        r = kvm_setup_default_irq_routing(kvm);
        if (r) {
            mutex_lock(&kvm->slots_lock);
            kvm_ioapic_destroy(kvm);
            mutex_unlock(&kvm->slots_lock);
            goto out;
        }
        break;
    case KVM_GET_IRQCHIP: {
        /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
        struct kvm_irqchip chip;

        r = -EFAULT;
        if (copy_from_user(&chip, argp, sizeof chip))
                goto out;
        r = -ENXIO;
        if (!irqchip_in_kernel(kvm))
            goto out;
        r = kvm_vm_ioctl_get_irqchip(kvm, &chip);
        if (r)
            goto out;
        r = -EFAULT;
        if (copy_to_user(argp, &chip, sizeof chip))
                goto out;
        r = 0;
        break;
        }
    case KVM_SET_IRQCHIP: {
        /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
        struct kvm_irqchip chip;

        r = -EFAULT;
        if (copy_from_user(&chip, argp, sizeof chip))
                goto out;
        r = -ENXIO;
        if (!irqchip_in_kernel(kvm))
            goto out;
        r = kvm_vm_ioctl_set_irqchip(kvm, &chip);
        if (r)
            goto out;
        r = 0;
        break;
        }
    default:
        ;
    }
out:
    return r;
}

int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
        struct kvm_sregs *sregs)
{
    return -EINVAL;
}

int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
        struct kvm_sregs *sregs)
{
    return -EINVAL;

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

    return -EINVAL;
}

static int kvm_alloc_vmm_area(void)
{
    if (!kvm_vmm_base && (kvm_vm_buffer_size < KVM_VM_BUFFER_SIZE)) {
        kvm_vmm_base = __get_free_pages(GFP_KERNEL,
                get_order(KVM_VMM_SIZE));
        if (!kvm_vmm_base)
            return -ENOMEM;

        memset((void *)kvm_vmm_base, 0, KVM_VMM_SIZE);
        kvm_vm_buffer = kvm_vmm_base + VMM_SIZE;

        printk(KERN_DEBUG"kvm:VMM's Base Addr:0x%lx, vm_buffer:0x%lx\n",
                kvm_vmm_base, kvm_vm_buffer);
    }

    return 0;
}

static void kvm_free_vmm_area(void)
{
    if (kvm_vmm_base) {
        /*Zero this area before free to avoid bits leak!!*/
        memset((void *)kvm_vmm_base, 0, KVM_VMM_SIZE);
        free_pages(kvm_vmm_base, get_order(KVM_VMM_SIZE));
        kvm_vmm_base  = 0;
        kvm_vm_buffer = 0;
        kvm_vsa_base = 0;
    }
}

static int vti_init_vpd(struct kvm_vcpu *vcpu)
{
    int i;
    union cpuid3_t cpuid3;
    struct vpd *vpd = to_host(vcpu->kvm, vcpu->arch.vpd);

    if (IS_ERR(vpd))
        return PTR_ERR(vpd);

    /* CPUID init */
    for (i = 0; i < 5; i++)
        vpd->vcpuid[i] = ia64_get_cpuid(i);

    /* Limit the CPUID number to 5 */
    cpuid3.value = vpd->vcpuid[3];
    cpuid3.number = 4;  /* 5 - 1 */
    vpd->vcpuid[3] = cpuid3.value;

    /*Set vac and vdc fields*/
    vpd->vac.a_from_int_cr = 1;
    vpd->vac.a_to_int_cr = 1;
    vpd->vac.a_from_psr = 1;
    vpd->vac.a_from_cpuid = 1;
    vpd->vac.a_cover = 1;
    vpd->vac.a_bsw = 1;
    vpd->vac.a_int = 1;
    vpd->vdc.d_vmsw = 1;

    /*Set virtual buffer*/
    vpd->virt_env_vaddr = KVM_VM_BUFFER_BASE;

    return 0;
}

static int vti_create_vp(struct kvm_vcpu *vcpu)
{
    long ret;
    struct vpd *vpd = vcpu->arch.vpd;
    unsigned long  vmm_ivt;

    vmm_ivt = kvm_vmm_info->vmm_ivt;

    printk(KERN_DEBUG "kvm: vcpu:%p,ivt: 0x%lx\n", vcpu, vmm_ivt);

    ret = ia64_pal_vp_create((u64 *)vpd, (u64 *)vmm_ivt, 0);

    if (ret) {
        printk(KERN_ERR"kvm: ia64_pal_vp_create failed!\n");
        return -EINVAL;
    }
    return 0;
}

static void init_ptce_info(struct kvm_vcpu *vcpu)
{
    ia64_ptce_info_t ptce = {0};

    ia64_get_ptce(&ptce);
    vcpu->arch.ptce_base = ptce.base;
    vcpu->arch.ptce_count[0] = ptce.count[0];
    vcpu->arch.ptce_count[1] = ptce.count[1];
    vcpu->arch.ptce_stride[0] = ptce.stride[0];
    vcpu->arch.ptce_stride[1] = ptce.stride[1];
}

static void kvm_migrate_hlt_timer(struct kvm_vcpu *vcpu)
{
    struct hrtimer *p_ht = &vcpu->arch.hlt_timer;

    if (hrtimer_cancel(p_ht))
        hrtimer_start_expires(p_ht, HRTIMER_MODE_ABS);
}

static enum hrtimer_restart hlt_timer_fn(struct hrtimer *data)
{
    struct kvm_vcpu *vcpu;
    wait_queue_head_t *q;

    vcpu  = container_of(data, struct kvm_vcpu, arch.hlt_timer);
    q = &vcpu->wq;

    if (vcpu->arch.mp_state != KVM_MP_STATE_HALTED)
        goto out;

    if (waitqueue_active(q))
        wake_up_interruptible(q);

out:
    vcpu->arch.timer_fired = 1;
    vcpu->arch.timer_check = 1;
    return HRTIMER_NORESTART;
}

#define PALE_RESET_ENTRY    0x80000000ffffffb0UL

bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu)
{
    return irqchip_in_kernel(vcpu->kvm) == (vcpu->arch.apic != NULL);
}

int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
{
    struct kvm_vcpu *v;
    int r;
    int i;
    long itc_offset;
    struct kvm *kvm = vcpu->kvm;
    struct kvm_pt_regs *regs = vcpu_regs(vcpu);

    union context *p_ctx = &vcpu->arch.guest;
    struct kvm_vcpu *vmm_vcpu = to_guest(vcpu->kvm, vcpu);

    /*Init vcpu context for first run.*/
    if (IS_ERR(vmm_vcpu))
        return PTR_ERR(vmm_vcpu);

    if (kvm_vcpu_is_bsp(vcpu)) {
        vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;

        /*Set entry address for first run.*/
        regs->cr_iip = PALE_RESET_ENTRY;

        /*Initialize itc offset for vcpus*/
        itc_offset = 0UL - kvm_get_itc(vcpu);
        for (i = 0; i < KVM_MAX_VCPUS; i++) {
            v = (struct kvm_vcpu *)((char *)vcpu +
                    sizeof(struct kvm_vcpu_data) * i);
            v->arch.itc_offset = itc_offset;
            v->arch.last_itc = 0;
        }
    } else
        vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED;

    r = -ENOMEM;
    vcpu->arch.apic = kzalloc(sizeof(struct kvm_lapic), GFP_KERNEL);
    if (!vcpu->arch.apic)
        goto out;
    vcpu->arch.apic->vcpu = vcpu;

    p_ctx->gr[1] = 0;
    p_ctx->gr[12] = (unsigned long)((char *)vmm_vcpu + KVM_STK_OFFSET);
    p_ctx->gr[13] = (unsigned long)vmm_vcpu;
    p_ctx->psr = 0x1008522000UL;
    p_ctx->ar[40] = FPSR_DEFAULT; /*fpsr*/
    p_ctx->caller_unat = 0;
    p_ctx->pr = 0x0;
    p_ctx->ar[36] = 0x0; /*unat*/
    p_ctx->ar[19] = 0x0; /*rnat*/
    p_ctx->ar[18] = (unsigned long)vmm_vcpu +
                ((sizeof(struct kvm_vcpu)+15) & ~15);
    p_ctx->ar[64] = 0x0; /*pfs*/
    p_ctx->cr[0] = 0x7e04UL;
    p_ctx->cr[2] = (unsigned long)kvm_vmm_info->vmm_ivt;
    p_ctx->cr[8] = 0x3c;

    /*Initialize region register*/
    p_ctx->rr[0] = 0x30;
    p_ctx->rr[1] = 0x30;
    p_ctx->rr[2] = 0x30;
    p_ctx->rr[3] = 0x30;
    p_ctx->rr[4] = 0x30;
    p_ctx->rr[5] = 0x30;
    p_ctx->rr[7] = 0x30;

    /*Initialize branch register 0*/
    p_ctx->br[0] = *(unsigned long *)kvm_vmm_info->vmm_entry;

    vcpu->arch.vmm_rr = kvm->arch.vmm_init_rr;
    vcpu->arch.metaphysical_rr0 = kvm->arch.metaphysical_rr0;
    vcpu->arch.metaphysical_rr4 = kvm->arch.metaphysical_rr4;

    hrtimer_init(&vcpu->arch.hlt_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
    vcpu->arch.hlt_timer.function = hlt_timer_fn;

    vcpu->arch.last_run_cpu = -1;
    vcpu->arch.vpd = (struct vpd *)VPD_BASE(vcpu->vcpu_id);
    vcpu->arch.vsa_base = kvm_vsa_base;
    vcpu->arch.__gp = kvm_vmm_gp;
    vcpu->arch.dirty_log_lock_pa = __pa(&kvm->arch.dirty_log_lock);
    vcpu->arch.vhpt.hash = (struct thash_data *)VHPT_BASE(vcpu->vcpu_id);
    vcpu->arch.vtlb.hash = (struct thash_data *)VTLB_BASE(vcpu->vcpu_id);
    init_ptce_info(vcpu);

    r = 0;
out:
    return r;
}

static int vti_vcpu_setup(struct kvm_vcpu *vcpu, int id)
{
    unsigned long psr;
    int r;

    local_irq_save(psr);
    r = kvm_insert_vmm_mapping(vcpu);
    local_irq_restore(psr);
    if (r)
        goto fail;
    r = kvm_vcpu_init(vcpu, vcpu->kvm, id);
    if (r)
        goto fail;

    r = vti_init_vpd(vcpu);
    if (r) {
        printk(KERN_DEBUG"kvm: vpd init error!!\n");
        goto uninit;
    }

    r = vti_create_vp(vcpu);
    if (r)
        goto uninit;

    kvm_purge_vmm_mapping(vcpu);

    return 0;
uninit:
    kvm_vcpu_uninit(vcpu);
fail:
    return r;
}

struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
        unsigned int id)
{
    struct kvm_vcpu *vcpu;
    unsigned long vm_base = kvm->arch.vm_base;
    int r;
    int cpu;

    BUG_ON(sizeof(struct kvm_vcpu) > VCPU_STRUCT_SIZE/2);

    r = -EINVAL;
    if (id >= KVM_MAX_VCPUS) {
        printk(KERN_ERR"kvm: Can't configure vcpus > %ld",
                KVM_MAX_VCPUS);
        goto fail;
    }

    r = -ENOMEM;
    if (!vm_base) {
        printk(KERN_ERR"kvm: Create vcpu[%d] error!\n", id);
        goto fail;
    }
    vcpu = (struct kvm_vcpu *)(vm_base + offsetof(struct kvm_vm_data,
                    vcpu_data[id].vcpu_struct));
    vcpu->kvm = kvm;

    cpu = get_cpu();
    r = vti_vcpu_setup(vcpu, id);
    put_cpu();

    if (r) {
        printk(KERN_DEBUG"kvm: vcpu_setup error!!\n");
        goto fail;
    }

    return vcpu;
fail:
    return ERR_PTR(r);
}

int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
{
    return 0;
}

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

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

int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
                    struct kvm_guest_debug *dbg)
{
    return -EINVAL;
}

void kvm_arch_free_vm(struct kvm *kvm)
{
    unsigned long vm_base = kvm->arch.vm_base;

    if (vm_base) {
        memset((void *)vm_base, 0, KVM_VM_DATA_SIZE);
        free_pages(vm_base, get_order(KVM_VM_DATA_SIZE));
    }

}

static void kvm_release_vm_pages(struct kvm *kvm)
{
    struct kvm_memslots *slots;
    struct kvm_memory_slot *memslot;
    int j;
    unsigned long base_gfn;

    slots = kvm_memslots(kvm);
    kvm_for_each_memslot(memslot, slots) {
        base_gfn = memslot->base_gfn;
        for (j = 0; j < memslot->npages; j++) {
            if (memslot->rmap[j])
                put_page((struct page *)memslot->rmap[j]);
        }
    }
}

void kvm_arch_sync_events(struct kvm *kvm)
{
}

void kvm_arch_destroy_vm(struct kvm *kvm)
{
    kvm_iommu_unmap_guest(kvm);
#ifdef  KVM_CAP_DEVICE_ASSIGNMENT
    kvm_free_all_assigned_devices(kvm);
#endif
    kfree(kvm->arch.vioapic);
    kvm_release_vm_pages(kvm);
}

void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
}

void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
    if (cpu != vcpu->cpu) {
        vcpu->cpu = cpu;
        if (vcpu->arch.ht_active)
            kvm_migrate_hlt_timer(vcpu);
    }
}

#define SAVE_REGS(_x)   regs->_x = vcpu->arch._x

int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
    struct vpd *vpd = to_host(vcpu->kvm, vcpu->arch.vpd);
    int i;

    vcpu_load(vcpu);

    for (i = 0; i < 16; i++) {
        regs->vpd.vgr[i] = vpd->vgr[i];
        regs->vpd.vbgr[i] = vpd->vbgr[i];
    }
    for (i = 0; i < 128; i++)
        regs->vpd.vcr[i] = vpd->vcr[i];
    regs->vpd.vhpi = vpd->vhpi;
    regs->vpd.vnat = vpd->vnat;
    regs->vpd.vbnat = vpd->vbnat;
    regs->vpd.vpsr = vpd->vpsr;
    regs->vpd.vpr = vpd->vpr;

    memcpy(&regs->saved_guest, &vcpu->arch.guest, sizeof(union context));

    SAVE_REGS(mp_state);
    SAVE_REGS(vmm_rr);
    memcpy(regs->itrs, vcpu->arch.itrs, sizeof(struct thash_data) * NITRS);
    memcpy(regs->dtrs, vcpu->arch.dtrs, sizeof(struct thash_data) * NDTRS);
    SAVE_REGS(itr_regions);
    SAVE_REGS(dtr_regions);
    SAVE_REGS(tc_regions);
    SAVE_REGS(irq_check);
    SAVE_REGS(itc_check);
    SAVE_REGS(timer_check);
    SAVE_REGS(timer_pending);
    SAVE_REGS(last_itc);
    for (i = 0; i < 8; i++) {
        regs->vrr[i] = vcpu->arch.vrr[i];
        regs->ibr[i] = vcpu->arch.ibr[i];
        regs->dbr[i] = vcpu->arch.dbr[i];
    }
    for (i = 0; i < 4; i++)
        regs->insvc[i] = vcpu->arch.insvc[i];
    regs->saved_itc = vcpu->arch.itc_offset + kvm_get_itc(vcpu);
    SAVE_REGS(xtp);
    SAVE_REGS(metaphysical_rr0);
    SAVE_REGS(metaphysical_rr4);
    SAVE_REGS(metaphysical_saved_rr0);
    SAVE_REGS(metaphysical_saved_rr4);
    SAVE_REGS(fp_psr);
    SAVE_REGS(saved_gp);

    vcpu_put(vcpu);
    return 0;
}

int kvm_arch_vcpu_ioctl_get_stack(struct kvm_vcpu *vcpu,
                  struct kvm_ia64_vcpu_stack *stack)
{
    memcpy(stack, vcpu, sizeof(struct kvm_ia64_vcpu_stack));
    return 0;
}

int kvm_arch_vcpu_ioctl_set_stack(struct kvm_vcpu *vcpu,
                  struct kvm_ia64_vcpu_stack *stack)
{
    memcpy(vcpu + 1, &stack->stack[0] + sizeof(struct kvm_vcpu),
           sizeof(struct kvm_ia64_vcpu_stack) - sizeof(struct kvm_vcpu));

    vcpu->arch.exit_data = ((struct kvm_vcpu *)stack)->arch.exit_data;
    return 0;
}

void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
{

    hrtimer_cancel(&vcpu->arch.hlt_timer);
    kfree(vcpu->arch.apic);
}


long kvm_arch_vcpu_ioctl(struct file *filp,
             unsigned int ioctl, unsigned long arg)
{
    struct kvm_vcpu *vcpu = filp->private_data;
    void __user *argp = (void __user *)arg;
    struct kvm_ia64_vcpu_stack *stack = NULL;
    long r;

    switch (ioctl) {
    case KVM_IA64_VCPU_GET_STACK: {
        struct kvm_ia64_vcpu_stack __user *user_stack;
            void __user *first_p = argp;

        r = -EFAULT;
        if (copy_from_user(&user_stack, first_p, sizeof(void *)))
            goto out;

        if (!access_ok(VERIFY_WRITE, user_stack,
                   sizeof(struct kvm_ia64_vcpu_stack))) {
            printk(KERN_INFO "KVM_IA64_VCPU_GET_STACK: "
                   "Illegal user destination address for stack\n");
            goto out;
        }
        stack = kzalloc(sizeof(struct kvm_ia64_vcpu_stack), GFP_KERNEL);
        if (!stack) {
            r = -ENOMEM;
            goto out;
        }

        r = kvm_arch_vcpu_ioctl_get_stack(vcpu, stack);
        if (r)
            goto out;

        if (copy_to_user(user_stack, stack,
                 sizeof(struct kvm_ia64_vcpu_stack))) {
            r = -EFAULT;
            goto out;
        }

        break;
    }
    case KVM_IA64_VCPU_SET_STACK: {
        struct kvm_ia64_vcpu_stack __user *user_stack;
            void __user *first_p = argp;

        r = -EFAULT;
        if (copy_from_user(&user_stack, first_p, sizeof(void *)))
            goto out;

        if (!access_ok(VERIFY_READ, user_stack,
                sizeof(struct kvm_ia64_vcpu_stack))) {
            printk(KERN_INFO "KVM_IA64_VCPU_SET_STACK: "
                   "Illegal user address for stack\n");
            goto out;
        }
        stack = kmalloc(sizeof(struct kvm_ia64_vcpu_stack), GFP_KERNEL);
        if (!stack) {
            r = -ENOMEM;
            goto out;
        }
        if (copy_from_user(stack, user_stack,
                   sizeof(struct kvm_ia64_vcpu_stack)))
            goto out;

        r = kvm_arch_vcpu_ioctl_set_stack(vcpu, stack);
        break;
    }

    default:
        r = -EINVAL;
    }

out:
    kfree(stack);
    return r;
}

int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
{
    return VM_FAULT_SIGBUS;
}

void kvm_arch_free_memslot(struct kvm_memory_slot *free,
               struct kvm_memory_slot *dont)
{
}

int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
{
    return 0;
}

int kvm_arch_prepare_memory_region(struct kvm *kvm,
        struct kvm_memory_slot *memslot,
        struct kvm_memory_slot old,
        struct kvm_userspace_memory_region *mem,
        int user_alloc)
{
    unsigned long i;
    unsigned long pfn;
    int npages = memslot->npages;
    unsigned long base_gfn = memslot->base_gfn;

    if (base_gfn + npages > (KVM_MAX_MEM_SIZE >> PAGE_SHIFT))
        return -ENOMEM;

    for (i = 0; i < npages; i++) {
        pfn = gfn_to_pfn(kvm, base_gfn + i);
        if (!kvm_is_mmio_pfn(pfn)) {
            kvm_set_pmt_entry(kvm, base_gfn + i,
                    pfn << PAGE_SHIFT,
                _PAGE_AR_RWX | _PAGE_MA_WB);
            memslot->rmap[i] = (unsigned long)pfn_to_page(pfn);
        } else {
            kvm_set_pmt_entry(kvm, base_gfn + i,
                    GPFN_PHYS_MMIO | (pfn << PAGE_SHIFT),
                    _PAGE_MA_UC);
            memslot->rmap[i] = 0;
            }
    }

    return 0;
}

void kvm_arch_commit_memory_region(struct kvm *kvm,
        struct kvm_userspace_memory_region *mem,
        struct kvm_memory_slot old,
        int user_alloc)
{
    return;
}

void kvm_arch_flush_shadow_all(struct kvm *kvm)
{
    kvm_flush_remote_tlbs(kvm);
}

void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
                   struct kvm_memory_slot *slot)
{
    kvm_arch_flush_shadow_all();
}

long kvm_arch_dev_ioctl(struct file *filp,
            unsigned int ioctl, unsigned long arg)
{
    return -EINVAL;
}

void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
{
    kvm_vcpu_uninit(vcpu);
}

static int vti_cpu_has_kvm_support(void)
{
    long  avail = 1, status = 1, control = 1;
    long ret;

    ret = ia64_pal_proc_get_features(&avail, &status, &control, 0);
    if (ret)
        goto out;

    if (!(avail & PAL_PROC_VM_BIT))
        goto out;

    printk(KERN_DEBUG"kvm: Hardware Supports VT\n");

    ret = ia64_pal_vp_env_info(&kvm_vm_buffer_size, &vp_env_info);
    if (ret)
        goto out;
    printk(KERN_DEBUG"kvm: VM Buffer Size:0x%lx\n", kvm_vm_buffer_size);

    if (!(vp_env_info & VP_OPCODE)) {
        printk(KERN_WARNING"kvm: No opcode ability on hardware, "
                "vm_env_info:0x%lx\n", vp_env_info);
    }

    return 1;
out:
    return 0;
}


/*
 * On SN2, the ITC isn't stable, so copy in fast path code to use the
 * SN2 RTC, replacing the ITC based default verion.
 */
static void kvm_patch_vmm(struct kvm_vmm_info *vmm_info,
              struct module *module)
{
    unsigned long new_ar, new_ar_sn2;
    unsigned long module_base;

    if (!ia64_platform_is("sn2"))
        return;

    module_base = (unsigned long)module->module_core;

    new_ar = kvm_vmm_base + vmm_info->patch_mov_ar - module_base;
    new_ar_sn2 = kvm_vmm_base + vmm_info->patch_mov_ar_sn2 - module_base;

    printk(KERN_INFO "kvm: Patching ITC emulation to use SGI SN2 RTC "
           "as source\n");

    /*
     * Copy the SN2 version of mov_ar into place. They are both
     * the same size, so 6 bundles is sufficient (6 * 0x10).
     */
    memcpy((void *)new_ar, (void *)new_ar_sn2, 0x60);
}

static int kvm_relocate_vmm(struct kvm_vmm_info *vmm_info,
                struct module *module)
{
    unsigned long module_base;
    unsigned long vmm_size;

    unsigned long vmm_offset, func_offset, fdesc_offset;
    struct fdesc *p_fdesc;

    BUG_ON(!module);

    if (!kvm_vmm_base) {
        printk("kvm: kvm area hasn't been initialized yet!!\n");
        return -EFAULT;
    }

    /*Calculate new position of relocated vmm module.*/
    module_base = (unsigned long)module->module_core;
    vmm_size = module->core_size;
    if (unlikely(vmm_size > KVM_VMM_SIZE))
        return -EFAULT;

    memcpy((void *)kvm_vmm_base, (void *)module_base, vmm_size);
    kvm_patch_vmm(vmm_info, module);
    kvm_flush_icache(kvm_vmm_base, vmm_size);

    /*Recalculate kvm_vmm_info based on new VMM*/
    vmm_offset = vmm_info->vmm_ivt - module_base;
    kvm_vmm_info->vmm_ivt = KVM_VMM_BASE + vmm_offset;
    printk(KERN_DEBUG"kvm: Relocated VMM's IVT Base Addr:%lx\n",
            kvm_vmm_info->vmm_ivt);

    fdesc_offset = (unsigned long)vmm_info->vmm_entry - module_base;
    kvm_vmm_info->vmm_entry = (kvm_vmm_entry *)(KVM_VMM_BASE +
                            fdesc_offset);
    func_offset = *(unsigned long *)vmm_info->vmm_entry - module_base;
    p_fdesc = (struct fdesc *)(kvm_vmm_base + fdesc_offset);
    p_fdesc->ip = KVM_VMM_BASE + func_offset;
    p_fdesc->gp = KVM_VMM_BASE+(p_fdesc->gp - module_base);

    printk(KERN_DEBUG"kvm: Relocated VMM's Init Entry Addr:%lx\n",
            KVM_VMM_BASE+func_offset);

    fdesc_offset = (unsigned long)vmm_info->tramp_entry - module_base;
    kvm_vmm_info->tramp_entry = (kvm_tramp_entry *)(KVM_VMM_BASE +
            fdesc_offset);
    func_offset = *(unsigned long *)vmm_info->tramp_entry - module_base;
    p_fdesc = (struct fdesc *)(kvm_vmm_base + fdesc_offset);
    p_fdesc->ip = KVM_VMM_BASE + func_offset;
    p_fdesc->gp = KVM_VMM_BASE + (p_fdesc->gp - module_base);

    kvm_vmm_gp = p_fdesc->gp;

    printk(KERN_DEBUG"kvm: Relocated VMM's Entry IP:%p\n",
                        kvm_vmm_info->vmm_entry);
    printk(KERN_DEBUG"kvm: Relocated VMM's Trampoline Entry IP:0x%lx\n",
                        KVM_VMM_BASE + func_offset);

    return 0;
}

int kvm_arch_init(void *opaque)
{
    int r;
    struct kvm_vmm_info *vmm_info = (struct kvm_vmm_info *)opaque;

    if (!vti_cpu_has_kvm_support()) {
        printk(KERN_ERR "kvm: No Hardware Virtualization Support!\n");
        r = -EOPNOTSUPP;
        goto out;
    }

    if (kvm_vmm_info) {
        printk(KERN_ERR "kvm: Already loaded VMM module!\n");
        r = -EEXIST;
        goto out;
    }

    r = -ENOMEM;
    kvm_vmm_info = kzalloc(sizeof(struct kvm_vmm_info), GFP_KERNEL);
    if (!kvm_vmm_info)
        goto out;

    if (kvm_alloc_vmm_area())
        goto out_free0;

    r = kvm_relocate_vmm(vmm_info, vmm_info->module);
    if (r)
        goto out_free1;

    return 0;

out_free1:
    kvm_free_vmm_area();
out_free0:
    kfree(kvm_vmm_info);
out:
    return r;
}

void kvm_arch_exit(void)
{
    kvm_free_vmm_area();
    kfree(kvm_vmm_info);
    kvm_vmm_info = NULL;
}

static void kvm_ia64_sync_dirty_log(struct kvm *kvm,
                    struct kvm_memory_slot *memslot)
{
    int i;
    long base;
    unsigned long n;
    unsigned long *dirty_bitmap = (unsigned long *)(kvm->arch.vm_base +
            offsetof(struct kvm_vm_data, kvm_mem_dirty_log));

    n = kvm_dirty_bitmap_bytes(memslot);
    base = memslot->base_gfn / BITS_PER_LONG;

    spin_lock(&kvm->arch.dirty_log_lock);
    for (i = 0; i < n/sizeof(long); ++i) {
        memslot->dirty_bitmap[i] = dirty_bitmap[base + i];
        dirty_bitmap[base + i] = 0;
    }
    spin_unlock(&kvm->arch.dirty_log_lock);
}

int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
        struct kvm_dirty_log *log)
{
    int r;
    unsigned long n;
    struct kvm_memory_slot *memslot;
    int is_dirty = 0;

    mutex_lock(&kvm->slots_lock);

    r = -EINVAL;
    if (log->slot >= KVM_MEMORY_SLOTS)
        goto out;

    memslot = id_to_memslot(kvm->memslots, log->slot);
    r = -ENOENT;
    if (!memslot->dirty_bitmap)
        goto out;

    kvm_ia64_sync_dirty_log(kvm, memslot);
    r = kvm_get_dirty_log(kvm, log, &is_dirty);
    if (r)
        goto out;

    /* If nothing is dirty, don't bother messing with page tables. */
    if (is_dirty) {
        kvm_flush_remote_tlbs(kvm);
        n = kvm_dirty_bitmap_bytes(memslot);
        memset(memslot->dirty_bitmap, 0, n);
    }
    r = 0;
out:
    mutex_unlock(&kvm->slots_lock);
    return r;
}

int kvm_arch_hardware_setup(void)
{
    return 0;
}

void kvm_arch_hardware_unsetup(void)
{
}

int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq)
{
    return __apic_accept_irq(vcpu, irq->vector);
}

int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest)
{
    return apic->vcpu->vcpu_id == dest;
}

int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda)
{
    return 0;
}

int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2)
{
    return vcpu1->arch.xtp - vcpu2->arch.xtp;
}

int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
        int short_hand, int dest, int dest_mode)
{
    struct kvm_lapic *target = vcpu->arch.apic;
    return (dest_mode == 0) ?
        kvm_apic_match_physical_addr(target, dest) :
        kvm_apic_match_logical_addr(target, dest);
}

static int find_highest_bits(int *dat)
{
    u32  bits, bitnum;
    int i;

    /* loop for all 256 bits */
    for (i = 7; i >= 0 ; i--) {
        bits = dat[i];
        if (bits) {
            bitnum = fls(bits);
            return i * 32 + bitnum - 1;
        }
    }

    return -1;
}

int kvm_highest_pending_irq(struct kvm_vcpu *vcpu)
{
    struct vpd *vpd = to_host(vcpu->kvm, vcpu->arch.vpd);

    if (vpd->irr[0] & (1UL << NMI_VECTOR))
        return NMI_VECTOR;
    if (vpd->irr[0] & (1UL << ExtINT_VECTOR))
        return ExtINT_VECTOR;

    return find_highest_bits((int *)&vpd->irr[0]);
}

int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
    return vcpu->arch.timer_fired;
}

int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
{
    return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE) ||
        (kvm_highest_pending_irq(vcpu) != -1);
}

int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
{
    return (!test_and_set_bit(KVM_REQ_KICK, &vcpu->requests));
}

int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
                    struct kvm_mp_state *mp_state)
{
    mp_state->mp_state = vcpu->arch.mp_state;
    return 0;
}

static int vcpu_reset(struct kvm_vcpu *vcpu)
{
    int r;
    long psr;
    local_irq_save(psr);
    r = kvm_insert_vmm_mapping(vcpu);
    local_irq_restore(psr);
    if (r)
        goto fail;

    vcpu->arch.launched = 0;
    kvm_arch_vcpu_uninit(vcpu);
    r = kvm_arch_vcpu_init(vcpu);
    if (r)
        goto fail;

    kvm_purge_vmm_mapping(vcpu);
    r = 0;
fail:
    return r;
}

int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
                    struct kvm_mp_state *mp_state)
{
    int r = 0;

    vcpu->arch.mp_state = mp_state->mp_state;
    if (vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)
        r = vcpu_reset(vcpu);
    return r;
}