powerpc.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
 *
 * Authors: Hollis Blanchard <[email protected]>
 *          Christian Ehrhardt <[email protected]>
 */

#include <linux/errno.h>
#include <linux/err.h>
#include <linux/kvm_host.h>
#include <linux/vmalloc.h>
#include <linux/hrtimer.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <asm/cputable.h>
#include <asm/uaccess.h>
#include <asm/kvm_ppc.h>
#include <asm/tlbflush.h>
#include <asm/cputhreads.h>
#include "timing.h"
#include "../mm/mmu_decl.h"

#define CREATE_TRACE_POINTS
#include "trace.h"

int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
{
    return !(v->arch.shared->msr & MSR_WE) ||
           !!(v->arch.pending_exceptions) ||
           v->requests;
}

int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
{
    return 1;
}

int kvmppc_kvm_pv(struct kvm_vcpu *vcpu)
{
    int nr = kvmppc_get_gpr(vcpu, 11);
    int r;
    unsigned long __maybe_unused param1 = kvmppc_get_gpr(vcpu, 3);
    unsigned long __maybe_unused param2 = kvmppc_get_gpr(vcpu, 4);
    unsigned long __maybe_unused param3 = kvmppc_get_gpr(vcpu, 5);
    unsigned long __maybe_unused param4 = kvmppc_get_gpr(vcpu, 6);
    unsigned long r2 = 0;

    if (!(vcpu->arch.shared->msr & MSR_SF)) {
        /* 32 bit mode */
        param1 &= 0xffffffff;
        param2 &= 0xffffffff;
        param3 &= 0xffffffff;
        param4 &= 0xffffffff;
    }

    switch (nr) {
    case HC_VENDOR_KVM | KVM_HC_PPC_MAP_MAGIC_PAGE:
    {
        vcpu->arch.magic_page_pa = param1;
        vcpu->arch.magic_page_ea = param2;

        r2 = KVM_MAGIC_FEAT_SR | KVM_MAGIC_FEAT_MAS0_TO_SPRG7;

        r = HC_EV_SUCCESS;
        break;
    }
    case HC_VENDOR_KVM | KVM_HC_FEATURES:
        r = HC_EV_SUCCESS;
#if defined(CONFIG_PPC_BOOK3S) || defined(CONFIG_KVM_E500V2)
        /* XXX Missing magic page on 44x */
        r2 |= (1 << KVM_FEATURE_MAGIC_PAGE);
#endif

        /* Second return value is in r4 */
        break;
    default:
        r = HC_EV_UNIMPLEMENTED;
        break;
    }

    kvmppc_set_gpr(vcpu, 4, r2);

    return r;
}

int kvmppc_sanity_check(struct kvm_vcpu *vcpu)
{
    int r = false;

    /* We have to know what CPU to virtualize */
    if (!vcpu->arch.pvr)
        goto out;

    /* PAPR only works with book3s_64 */
    if ((vcpu->arch.cpu_type != KVM_CPU_3S_64) && vcpu->arch.papr_enabled)
        goto out;

#ifdef CONFIG_KVM_BOOK3S_64_HV
    /* HV KVM can only do PAPR mode for now */
    if (!vcpu->arch.papr_enabled)
        goto out;
#endif

#ifdef CONFIG_KVM_BOOKE_HV
    if (!cpu_has_feature(CPU_FTR_EMB_HV))
        goto out;
#endif

    r = true;

out:
    vcpu->arch.sane = r;
    return r ? 0 : -EINVAL;
}

int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
{
    enum emulation_result er;
    int r;

    er = kvmppc_emulate_instruction(run, vcpu);
    switch (er) {
    case EMULATE_DONE:
        /* Future optimization: only reload non-volatiles if they were
         * actually modified. */
        r = RESUME_GUEST_NV;
        break;
    case EMULATE_DO_MMIO:
        run->exit_reason = KVM_EXIT_MMIO;
        /* We must reload nonvolatiles because "update" load/store
         * instructions modify register state. */
        /* Future optimization: only reload non-volatiles if they were
         * actually modified. */
        r = RESUME_HOST_NV;
        break;
    case EMULATE_FAIL:
        /* XXX Deliver Program interrupt to guest. */
        printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
               kvmppc_get_last_inst(vcpu));
        r = RESUME_HOST;
        break;
    default:
        BUG();
    }

    return r;
}

int kvm_arch_hardware_enable(void *garbage)
{
    return 0;
}

void kvm_arch_hardware_disable(void *garbage)
{
}

int kvm_arch_hardware_setup(void)
{
    return 0;
}

void kvm_arch_hardware_unsetup(void)
{
}

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

int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
{
    if (type)
        return -EINVAL;

    return kvmppc_core_init_vm(kvm);
}

void kvm_arch_destroy_vm(struct kvm *kvm)
{
    unsigned int i;
    struct kvm_vcpu *vcpu;

    kvm_for_each_vcpu(i, vcpu, kvm)
        kvm_arch_vcpu_free(vcpu);

    mutex_lock(&kvm->lock);
    for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
        kvm->vcpus[i] = NULL;

    atomic_set(&kvm->online_vcpus, 0);

    kvmppc_core_destroy_vm(kvm);

    mutex_unlock(&kvm->lock);
}

void kvm_arch_sync_events(struct kvm *kvm)
{
}

int kvm_dev_ioctl_check_extension(long ext)
{
    int r;

    switch (ext) {
#ifdef CONFIG_BOOKE
    case KVM_CAP_PPC_BOOKE_SREGS:
#else
    case KVM_CAP_PPC_SEGSTATE:
    case KVM_CAP_PPC_HIOR:
    case KVM_CAP_PPC_PAPR:
#endif
    case KVM_CAP_PPC_UNSET_IRQ:
    case KVM_CAP_PPC_IRQ_LEVEL:
    case KVM_CAP_ENABLE_CAP:
    case KVM_CAP_ONE_REG:
        r = 1;
        break;
#ifndef CONFIG_KVM_BOOK3S_64_HV
    case KVM_CAP_PPC_PAIRED_SINGLES:
    case KVM_CAP_PPC_OSI:
    case KVM_CAP_PPC_GET_PVINFO:
#if defined(CONFIG_KVM_E500V2) || defined(CONFIG_KVM_E500MC)
    case KVM_CAP_SW_TLB:
#endif
        r = 1;
        break;
    case KVM_CAP_COALESCED_MMIO:
        r = KVM_COALESCED_MMIO_PAGE_OFFSET;
        break;
#endif
#ifdef CONFIG_PPC_BOOK3S_64
    case KVM_CAP_SPAPR_TCE:
    case KVM_CAP_PPC_ALLOC_HTAB:
        r = 1;
        break;
#endif /* CONFIG_PPC_BOOK3S_64 */
#ifdef CONFIG_KVM_BOOK3S_64_HV
    case KVM_CAP_PPC_SMT:
        r = threads_per_core;
        break;
    case KVM_CAP_PPC_RMA:
        r = 1;
        /* PPC970 requires an RMA */
        if (cpu_has_feature(CPU_FTR_ARCH_201))
            r = 2;
        break;
    case KVM_CAP_SYNC_MMU:
        r = cpu_has_feature(CPU_FTR_ARCH_206) ? 1 : 0;
        break;
#endif
    case KVM_CAP_NR_VCPUS:
        /*
         * Recommending a number of CPUs is somewhat arbitrary; we
         * return the number of present CPUs for -HV (since a host
         * will have secondary threads "offline"), and for other KVM
         * implementations just count online CPUs.
         */
#ifdef CONFIG_KVM_BOOK3S_64_HV
        r = num_present_cpus();
#else
        r = num_online_cpus();
#endif
        break;
    case KVM_CAP_MAX_VCPUS:
        r = KVM_MAX_VCPUS;
        break;
#ifdef CONFIG_PPC_BOOK3S_64
    case KVM_CAP_PPC_GET_SMMU_INFO:
        r = 1;
        break;
#endif
    default:
        r = 0;
        break;
    }
    return r;

}

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

void kvm_arch_free_memslot(struct kvm_memory_slot *free,
               struct kvm_memory_slot *dont)
{
    if (!dont || free->arch.rmap != dont->arch.rmap) {
        vfree(free->arch.rmap);
        free->arch.rmap = NULL;
    }
}

int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
{
    slot->arch.rmap = vzalloc(npages * sizeof(*slot->arch.rmap));
    if (!slot->arch.rmap)
        return -ENOMEM;

    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)
{
    return kvmppc_core_prepare_memory_region(kvm, mem);
}

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

void kvm_arch_flush_shadow_all(struct kvm *kvm)
{
}

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

struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
{
    struct kvm_vcpu *vcpu;
    vcpu = kvmppc_core_vcpu_create(kvm, id);
    if (!IS_ERR(vcpu)) {
        vcpu->arch.wqp = &vcpu->wq;
        kvmppc_create_vcpu_debugfs(vcpu, id);
    }
    return vcpu;
}

void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
{
    /* Make sure we're not using the vcpu anymore */
    hrtimer_cancel(&vcpu->arch.dec_timer);
    tasklet_kill(&vcpu->arch.tasklet);

    kvmppc_remove_vcpu_debugfs(vcpu);
    kvmppc_core_vcpu_free(vcpu);
}

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

int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
    return kvmppc_core_pending_dec(vcpu);
}

/*
 * low level hrtimer wake routine. Because this runs in hardirq context
 * we schedule a tasklet to do the real work.
 */
enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
{
    struct kvm_vcpu *vcpu;

    vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
    tasklet_schedule(&vcpu->arch.tasklet);

    return HRTIMER_NORESTART;
}

int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
{
    hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
    tasklet_init(&vcpu->arch.tasklet, kvmppc_decrementer_func, (ulong)vcpu);
    vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
    vcpu->arch.dec_expires = ~(u64)0;

#ifdef CONFIG_KVM_EXIT_TIMING
    mutex_init(&vcpu->arch.exit_timing_lock);
#endif

    return 0;
}

void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
{
    kvmppc_mmu_destroy(vcpu);
}

void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
#ifdef CONFIG_BOOKE
    /*
     * vrsave (formerly usprg0) isn't used by Linux, but may
     * be used by the guest.
     *
     * On non-booke this is associated with Altivec and
     * is handled by code in book3s.c.
     */
    mtspr(SPRN_VRSAVE, vcpu->arch.vrsave);
#endif
    kvmppc_core_vcpu_load(vcpu, cpu);
    vcpu->cpu = smp_processor_id();
}

void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
    kvmppc_core_vcpu_put(vcpu);
#ifdef CONFIG_BOOKE
    vcpu->arch.vrsave = mfspr(SPRN_VRSAVE);
#endif
    vcpu->cpu = -1;
}

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

static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
                                     struct kvm_run *run)
{
    kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, run->dcr.data);
}

static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
                                      struct kvm_run *run)
{
    u64 uninitialized_var(gpr);

    if (run->mmio.len > sizeof(gpr)) {
        printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
        return;
    }

    if (vcpu->arch.mmio_is_bigendian) {
        switch (run->mmio.len) {
        case 8: gpr = *(u64 *)run->mmio.data; break;
        case 4: gpr = *(u32 *)run->mmio.data; break;
        case 2: gpr = *(u16 *)run->mmio.data; break;
        case 1: gpr = *(u8 *)run->mmio.data; break;
        }
    } else {
        /* Convert BE data from userland back to LE. */
        switch (run->mmio.len) {
        case 4: gpr = ld_le32((u32 *)run->mmio.data); break;
        case 2: gpr = ld_le16((u16 *)run->mmio.data); break;
        case 1: gpr = *(u8 *)run->mmio.data; break;
        }
    }

    if (vcpu->arch.mmio_sign_extend) {
        switch (run->mmio.len) {
#ifdef CONFIG_PPC64
        case 4:
            gpr = (s64)(s32)gpr;
            break;
#endif
        case 2:
            gpr = (s64)(s16)gpr;
            break;
        case 1:
            gpr = (s64)(s8)gpr;
            break;
        }
    }

    kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);

    switch (vcpu->arch.io_gpr & KVM_MMIO_REG_EXT_MASK) {
    case KVM_MMIO_REG_GPR:
        kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
        break;
    case KVM_MMIO_REG_FPR:
        vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_MMIO_REG_MASK] = gpr;
        break;
#ifdef CONFIG_PPC_BOOK3S
    case KVM_MMIO_REG_QPR:
        vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_MMIO_REG_MASK] = gpr;
        break;
    case KVM_MMIO_REG_FQPR:
        vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_MMIO_REG_MASK] = gpr;
        vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_MMIO_REG_MASK] = gpr;
        break;
#endif
    default:
        BUG();
    }
}

int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
                       unsigned int rt, unsigned int bytes, int is_bigendian)
{
    if (bytes > sizeof(run->mmio.data)) {
        printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
               run->mmio.len);
    }

    run->mmio.phys_addr = vcpu->arch.paddr_accessed;
    run->mmio.len = bytes;
    run->mmio.is_write = 0;

    vcpu->arch.io_gpr = rt;
    vcpu->arch.mmio_is_bigendian = is_bigendian;
    vcpu->mmio_needed = 1;
    vcpu->mmio_is_write = 0;
    vcpu->arch.mmio_sign_extend = 0;

    return EMULATE_DO_MMIO;
}

/* Same as above, but sign extends */
int kvmppc_handle_loads(struct kvm_run *run, struct kvm_vcpu *vcpu,
                        unsigned int rt, unsigned int bytes, int is_bigendian)
{
    int r;

    r = kvmppc_handle_load(run, vcpu, rt, bytes, is_bigendian);
    vcpu->arch.mmio_sign_extend = 1;

    return r;
}

int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
                        u64 val, unsigned int bytes, int is_bigendian)
{
    void *data = run->mmio.data;

    if (bytes > sizeof(run->mmio.data)) {
        printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
               run->mmio.len);
    }

    run->mmio.phys_addr = vcpu->arch.paddr_accessed;
    run->mmio.len = bytes;
    run->mmio.is_write = 1;
    vcpu->mmio_needed = 1;
    vcpu->mmio_is_write = 1;

    /* Store the value at the lowest bytes in 'data'. */
    if (is_bigendian) {
        switch (bytes) {
        case 8: *(u64 *)data = val; break;
        case 4: *(u32 *)data = val; break;
        case 2: *(u16 *)data = val; break;
        case 1: *(u8  *)data = val; break;
        }
    } else {
        /* Store LE value into 'data'. */
        switch (bytes) {
        case 4: st_le32(data, val); break;
        case 2: st_le16(data, val); break;
        case 1: *(u8 *)data = val; break;
        }
    }

    return EMULATE_DO_MMIO;
}

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

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

    if (vcpu->mmio_needed) {
        if (!vcpu->mmio_is_write)
            kvmppc_complete_mmio_load(vcpu, run);
        vcpu->mmio_needed = 0;
    } else if (vcpu->arch.dcr_needed) {
        if (!vcpu->arch.dcr_is_write)
            kvmppc_complete_dcr_load(vcpu, run);
        vcpu->arch.dcr_needed = 0;
    } else if (vcpu->arch.osi_needed) {
        u64 *gprs = run->osi.gprs;
        int i;

        for (i = 0; i < 32; i++)
            kvmppc_set_gpr(vcpu, i, gprs[i]);
        vcpu->arch.osi_needed = 0;
    } else if (vcpu->arch.hcall_needed) {
        int i;

        kvmppc_set_gpr(vcpu, 3, run->papr_hcall.ret);
        for (i = 0; i < 9; ++i)
            kvmppc_set_gpr(vcpu, 4 + i, run->papr_hcall.args[i]);
        vcpu->arch.hcall_needed = 0;
    }

    r = kvmppc_vcpu_run(run, vcpu);

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

    return r;
}

int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
{
    if (irq->irq == KVM_INTERRUPT_UNSET) {
        kvmppc_core_dequeue_external(vcpu, irq);
        return 0;
    }

    kvmppc_core_queue_external(vcpu, irq);

    kvm_vcpu_kick(vcpu);

    return 0;
}

static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
                     struct kvm_enable_cap *cap)
{
    int r;

    if (cap->flags)
        return -EINVAL;

    switch (cap->cap) {
    case KVM_CAP_PPC_OSI:
        r = 0;
        vcpu->arch.osi_enabled = true;
        break;
    case KVM_CAP_PPC_PAPR:
        r = 0;
        vcpu->arch.papr_enabled = true;
        break;
#if defined(CONFIG_KVM_E500V2) || defined(CONFIG_KVM_E500MC)
    case KVM_CAP_SW_TLB: {
        struct kvm_config_tlb cfg;
        void __user *user_ptr = (void __user *)(uintptr_t)cap->args[0];

        r = -EFAULT;
        if (copy_from_user(&cfg, user_ptr, sizeof(cfg)))
            break;

        r = kvm_vcpu_ioctl_config_tlb(vcpu, &cfg);
        break;
    }
#endif
    default:
        r = -EINVAL;
        break;
    }

    if (!r)
        r = kvmppc_sanity_check(vcpu);

    return r;
}

int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
                                    struct kvm_mp_state *mp_state)
{
    return -EINVAL;
}

int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
                                    struct kvm_mp_state *mp_state)
{
    return -EINVAL;
}

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;
    long r;

    switch (ioctl) {
    case KVM_INTERRUPT: {
        struct kvm_interrupt irq;
        r = -EFAULT;
        if (copy_from_user(&irq, argp, sizeof(irq)))
            goto out;
        r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
        goto out;
    }

    case KVM_ENABLE_CAP:
    {
        struct kvm_enable_cap cap;
        r = -EFAULT;
        if (copy_from_user(&cap, argp, sizeof(cap)))
            goto out;
        r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
        break;
    }

    case KVM_SET_ONE_REG:
    case KVM_GET_ONE_REG:
    {
        struct kvm_one_reg reg;
        r = -EFAULT;
        if (copy_from_user(&reg, argp, sizeof(reg)))
            goto out;
        if (ioctl == KVM_SET_ONE_REG)
            r = kvm_vcpu_ioctl_set_one_reg(vcpu, &reg);
        else
            r = kvm_vcpu_ioctl_get_one_reg(vcpu, &reg);
        break;
    }

#if defined(CONFIG_KVM_E500V2) || defined(CONFIG_KVM_E500MC)
    case KVM_DIRTY_TLB: {
        struct kvm_dirty_tlb dirty;
        r = -EFAULT;
        if (copy_from_user(&dirty, argp, sizeof(dirty)))
            goto out;
        r = kvm_vcpu_ioctl_dirty_tlb(vcpu, &dirty);
        break;
    }
#endif
    default:
        r = -EINVAL;
    }

out:
    return r;
}

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

static int kvm_vm_ioctl_get_pvinfo(struct kvm_ppc_pvinfo *pvinfo)
{
    u32 inst_lis = 0x3c000000;
    u32 inst_ori = 0x60000000;
    u32 inst_nop = 0x60000000;
    u32 inst_sc = 0x44000002;
    u32 inst_imm_mask = 0xffff;

    /*
     * The hypercall to get into KVM from within guest context is as
     * follows:
     *
     *    lis r0, r0, KVM_SC_MAGIC_R0@h
     *    ori r0, KVM_SC_MAGIC_R0@l
     *    sc
     *    nop
     */
    pvinfo->hcall[0] = inst_lis | ((KVM_SC_MAGIC_R0 >> 16) & inst_imm_mask);
    pvinfo->hcall[1] = inst_ori | (KVM_SC_MAGIC_R0 & inst_imm_mask);
    pvinfo->hcall[2] = inst_sc;
    pvinfo->hcall[3] = inst_nop;

    return 0;
}

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

    switch (ioctl) {
    case KVM_PPC_GET_PVINFO: {
        struct kvm_ppc_pvinfo pvinfo;
        memset(&pvinfo, 0, sizeof(pvinfo));
        r = kvm_vm_ioctl_get_pvinfo(&pvinfo);
        if (copy_to_user(argp, &pvinfo, sizeof(pvinfo))) {
            r = -EFAULT;
            goto out;
        }

        break;
    }
#ifdef CONFIG_PPC_BOOK3S_64
    case KVM_CREATE_SPAPR_TCE: {
        struct kvm_create_spapr_tce create_tce;
        struct kvm *kvm = filp->private_data;

        r = -EFAULT;
        if (copy_from_user(&create_tce, argp, sizeof(create_tce)))
            goto out;
        r = kvm_vm_ioctl_create_spapr_tce(kvm, &create_tce);
        goto out;
    }
#endif /* CONFIG_PPC_BOOK3S_64 */

#ifdef CONFIG_KVM_BOOK3S_64_HV
    case KVM_ALLOCATE_RMA: {
        struct kvm *kvm = filp->private_data;
        struct kvm_allocate_rma rma;

        r = kvm_vm_ioctl_allocate_rma(kvm, &rma);
        if (r >= 0 && copy_to_user(argp, &rma, sizeof(rma)))
            r = -EFAULT;
        break;
    }

    case KVM_PPC_ALLOCATE_HTAB: {
        struct kvm *kvm = filp->private_data;
        u32 htab_order;

        r = -EFAULT;
        if (get_user(htab_order, (u32 __user *)argp))
            break;
        r = kvmppc_alloc_reset_hpt(kvm, &htab_order);
        if (r)
            break;
        r = -EFAULT;
        if (put_user(htab_order, (u32 __user *)argp))
            break;
        r = 0;
        break;
    }
#endif /* CONFIG_KVM_BOOK3S_64_HV */

#ifdef CONFIG_PPC_BOOK3S_64
    case KVM_PPC_GET_SMMU_INFO: {
        struct kvm *kvm = filp->private_data;
        struct kvm_ppc_smmu_info info;

        memset(&info, 0, sizeof(info));
        r = kvm_vm_ioctl_get_smmu_info(kvm, &info);
        if (r >= 0 && copy_to_user(argp, &info, sizeof(info)))
            r = -EFAULT;
        break;
    }
#endif /* CONFIG_PPC_BOOK3S_64 */
    default:
        r = -ENOTTY;
    }

out:
    return r;
}

static unsigned long lpid_inuse[BITS_TO_LONGS(KVMPPC_NR_LPIDS)];
static unsigned long nr_lpids;

long kvmppc_alloc_lpid(void)
{
    long lpid;

    do {
        lpid = find_first_zero_bit(lpid_inuse, KVMPPC_NR_LPIDS);
        if (lpid >= nr_lpids) {
            pr_err("%s: No LPIDs free\n", __func__);
            return -ENOMEM;
        }
    } while (test_and_set_bit(lpid, lpid_inuse));

    return lpid;
}

void kvmppc_claim_lpid(long lpid)
{
    set_bit(lpid, lpid_inuse);
}

void kvmppc_free_lpid(long lpid)
{
    clear_bit(lpid, lpid_inuse);
}

void kvmppc_init_lpid(unsigned long nr_lpids_param)
{
    nr_lpids = min_t(unsigned long, KVMPPC_NR_LPIDS, nr_lpids_param);
    memset(lpid_inuse, 0, sizeof(lpid_inuse));
}

int kvm_arch_init(void *opaque)
{
    return 0;
}

void kvm_arch_exit(void)
{
}