powerpc/kvm/book3s_pr: Return appropriate error when allocation fails

[mirror_ubuntu-bionic-kernel.git] / arch / powerpc / kvm / book3s_pr.c

/*
 * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved.
 *
 * Authors:
 *    Alexander Graf <agraf@suse.de>
 *    Kevin Wolf <mail@kevin-wolf.de>
 *    Paul Mackerras <paulus@samba.org>
 *
 * Description:
 * Functions relating to running KVM on Book 3S processors where
 * we don't have access to hypervisor mode, and we run the guest
 * in problem state (user mode).
 *
 * This file is derived from arch/powerpc/kvm/44x.c,
 * by Hollis Blanchard <hollisb@us.ibm.com>.
 *
 * 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.
 */

#include <linux/kvm_host.h>
#include <linux/export.h>
#include <linux/err.h>
#include <linux/slab.h>

#include <asm/reg.h>
#include <asm/cputable.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/kvm_ppc.h>
#include <asm/kvm_book3s.h>
#include <asm/mmu_context.h>
#include <asm/switch_to.h>
#include <asm/firmware.h>
#include <asm/hvcall.h>
#include <linux/gfp.h>
#include <linux/sched.h>
#include <linux/vmalloc.h>
#include <linux/highmem.h>

#include "trace.h"

/* #define EXIT_DEBUG */
/* #define DEBUG_EXT */

static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
                             ulong msr);

/* Some compatibility defines */
#ifdef CONFIG_PPC_BOOK3S_32
#define MSR_USER32 MSR_USER
#define MSR_USER64 MSR_USER
#define HW_PAGE_SIZE PAGE_SIZE
#endif

void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
#ifdef CONFIG_PPC_BOOK3S_64
        struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
        memcpy(svcpu->slb, to_book3s(vcpu)->slb_shadow, sizeof(svcpu->slb));
        memcpy(&get_paca()->shadow_vcpu, to_book3s(vcpu)->shadow_vcpu,
               sizeof(get_paca()->shadow_vcpu));
        svcpu->slb_max = to_book3s(vcpu)->slb_shadow_max;
        svcpu_put(svcpu);
#endif
        vcpu->cpu = smp_processor_id();
#ifdef CONFIG_PPC_BOOK3S_32
        current->thread.kvm_shadow_vcpu = to_book3s(vcpu)->shadow_vcpu;
#endif
}

void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
{
#ifdef CONFIG_PPC_BOOK3S_64
        struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
        memcpy(to_book3s(vcpu)->slb_shadow, svcpu->slb, sizeof(svcpu->slb));
        memcpy(to_book3s(vcpu)->shadow_vcpu, &get_paca()->shadow_vcpu,
               sizeof(get_paca()->shadow_vcpu));
        to_book3s(vcpu)->slb_shadow_max = svcpu->slb_max;
        svcpu_put(svcpu);
#endif

        kvmppc_giveup_ext(vcpu, MSR_FP | MSR_VEC | MSR_VSX);
        vcpu->cpu = -1;
}

int kvmppc_core_check_requests(struct kvm_vcpu *vcpu)
{
        int r = 1; /* Indicate we want to get back into the guest */

        /* We misuse TLB_FLUSH to indicate that we want to clear
           all shadow cache entries */
        if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu))
                kvmppc_mmu_pte_flush(vcpu, 0, 0);

        return r;
}

/************* MMU Notifiers *************/

int kvm_unmap_hva(struct kvm *kvm, unsigned long hva)
{
        trace_kvm_unmap_hva(hva);

        /*
         * Flush all shadow tlb entries everywhere. This is slow, but
         * we are 100% sure that we catch the to be unmapped page
         */
        kvm_flush_remote_tlbs(kvm);

        return 0;
}

int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end)
{
        /* kvm_unmap_hva flushes everything anyways */
        kvm_unmap_hva(kvm, start);

        return 0;
}

int kvm_age_hva(struct kvm *kvm, unsigned long hva)
{
        /* XXX could be more clever ;) */
        return 0;
}

int kvm_test_age_hva(struct kvm *kvm, unsigned long hva)
{
        /* XXX could be more clever ;) */
        return 0;
}

void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
{
        /* The page will get remapped properly on its next fault */
        kvm_unmap_hva(kvm, hva);
}

/*****************************************/

static void kvmppc_recalc_shadow_msr(struct kvm_vcpu *vcpu)
{
        ulong smsr = vcpu->arch.shared->msr;

        /* Guest MSR values */
        smsr &= MSR_FE0 | MSR_FE1 | MSR_SF | MSR_SE | MSR_BE;
        /* Process MSR values */
        smsr |= MSR_ME | MSR_RI | MSR_IR | MSR_DR | MSR_PR | MSR_EE;
        /* External providers the guest reserved */
        smsr |= (vcpu->arch.shared->msr & vcpu->arch.guest_owned_ext);
        /* 64-bit Process MSR values */
#ifdef CONFIG_PPC_BOOK3S_64
        smsr |= MSR_ISF | MSR_HV;
#endif
        vcpu->arch.shadow_msr = smsr;
}

void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 msr)
{
        ulong old_msr = vcpu->arch.shared->msr;

#ifdef EXIT_DEBUG
        printk(KERN_INFO "KVM: Set MSR to 0x%llx\n", msr);
#endif

        msr &= to_book3s(vcpu)->msr_mask;
        vcpu->arch.shared->msr = msr;
        kvmppc_recalc_shadow_msr(vcpu);

        if (msr & MSR_POW) {
                if (!vcpu->arch.pending_exceptions) {
                        kvm_vcpu_block(vcpu);
                        clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
                        vcpu->stat.halt_wakeup++;

                        /* Unset POW bit after we woke up */
                        msr &= ~MSR_POW;
                        vcpu->arch.shared->msr = msr;
                }
        }

        if ((vcpu->arch.shared->msr & (MSR_PR|MSR_IR|MSR_DR)) !=
                   (old_msr & (MSR_PR|MSR_IR|MSR_DR))) {
                kvmppc_mmu_flush_segments(vcpu);
                kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));

                /* Preload magic page segment when in kernel mode */
                if (!(msr & MSR_PR) && vcpu->arch.magic_page_pa) {
                        struct kvm_vcpu_arch *a = &vcpu->arch;

                        if (msr & MSR_DR)
                                kvmppc_mmu_map_segment(vcpu, a->magic_page_ea);
                        else
                                kvmppc_mmu_map_segment(vcpu, a->magic_page_pa);
                }
        }

        /*
         * When switching from 32 to 64-bit, we may have a stale 32-bit
         * magic page around, we need to flush it. Typically 32-bit magic
         * page will be instanciated when calling into RTAS. Note: We
         * assume that such transition only happens while in kernel mode,
         * ie, we never transition from user 32-bit to kernel 64-bit with
         * a 32-bit magic page around.
         */
        if (vcpu->arch.magic_page_pa &&
            !(old_msr & MSR_PR) && !(old_msr & MSR_SF) && (msr & MSR_SF)) {
                /* going from RTAS to normal kernel code */
                kvmppc_mmu_pte_flush(vcpu, (uint32_t)vcpu->arch.magic_page_pa,
                                     ~0xFFFUL);
        }

        /* Preload FPU if it's enabled */
        if (vcpu->arch.shared->msr & MSR_FP)
                kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
}

void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr)
{
        u32 host_pvr;

        vcpu->arch.hflags &= ~BOOK3S_HFLAG_SLB;
        vcpu->arch.pvr = pvr;
#ifdef CONFIG_PPC_BOOK3S_64
        if ((pvr >= 0x330000) && (pvr < 0x70330000)) {
                kvmppc_mmu_book3s_64_init(vcpu);
                if (!to_book3s(vcpu)->hior_explicit)
                        to_book3s(vcpu)->hior = 0xfff00000;
                to_book3s(vcpu)->msr_mask = 0xffffffffffffffffULL;
                vcpu->arch.cpu_type = KVM_CPU_3S_64;
        } else
#endif
        {
                kvmppc_mmu_book3s_32_init(vcpu);
                if (!to_book3s(vcpu)->hior_explicit)
                        to_book3s(vcpu)->hior = 0;
                to_book3s(vcpu)->msr_mask = 0xffffffffULL;
                vcpu->arch.cpu_type = KVM_CPU_3S_32;
        }

        kvmppc_sanity_check(vcpu);

        /* If we are in hypervisor level on 970, we can tell the CPU to
         * treat DCBZ as 32 bytes store */
        vcpu->arch.hflags &= ~BOOK3S_HFLAG_DCBZ32;
        if (vcpu->arch.mmu.is_dcbz32(vcpu) && (mfmsr() & MSR_HV) &&
            !strcmp(cur_cpu_spec->platform, "ppc970"))
                vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;

        /* Cell performs badly if MSR_FEx are set. So let's hope nobody
           really needs them in a VM on Cell and force disable them. */
        if (!strcmp(cur_cpu_spec->platform, "ppc-cell-be"))
                to_book3s(vcpu)->msr_mask &= ~(MSR_FE0 | MSR_FE1);

#ifdef CONFIG_PPC_BOOK3S_32
        /* 32 bit Book3S always has 32 byte dcbz */
        vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
#endif

        /* On some CPUs we can execute paired single operations natively */
        asm ( "mfpvr %0" : "=r"(host_pvr));
        switch (host_pvr) {
        case 0x00080200:        /* lonestar 2.0 */
        case 0x00088202:        /* lonestar 2.2 */
        case 0x70000100:        /* gekko 1.0 */
        case 0x00080100:        /* gekko 2.0 */
        case 0x00083203:        /* gekko 2.3a */
        case 0x00083213:        /* gekko 2.3b */
        case 0x00083204:        /* gekko 2.4 */
        case 0x00083214:        /* gekko 2.4e (8SE) - retail HW2 */
        case 0x00087200:        /* broadway */
                vcpu->arch.hflags |= BOOK3S_HFLAG_NATIVE_PS;
                /* Enable HID2.PSE - in case we need it later */
                mtspr(SPRN_HID2_GEKKO, mfspr(SPRN_HID2_GEKKO) | (1 << 29));
        }
}

/* Book3s_32 CPUs always have 32 bytes cache line size, which Linux assumes. To
 * make Book3s_32 Linux work on Book3s_64, we have to make sure we trap dcbz to
 * emulate 32 bytes dcbz length.
 *
 * The Book3s_64 inventors also realized this case and implemented a special bit
 * in the HID5 register, which is a hypervisor ressource. Thus we can't use it.
 *
 * My approach here is to patch the dcbz instruction on executing pages.
 */
static void kvmppc_patch_dcbz(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
{
        struct page *hpage;
        u64 hpage_offset;
        u32 *page;
        int i;

        hpage = gfn_to_page(vcpu->kvm, pte->raddr >> PAGE_SHIFT);
        if (is_error_page(hpage))
                return;

        hpage_offset = pte->raddr & ~PAGE_MASK;
        hpage_offset &= ~0xFFFULL;
        hpage_offset /= 4;

        get_page(hpage);
        page = kmap_atomic(hpage);

        /* patch dcbz into reserved instruction, so we trap */
        for (i=hpage_offset; i < hpage_offset + (HW_PAGE_SIZE / 4); i++)
                if ((page[i] & 0xff0007ff) == INS_DCBZ)
                        page[i] &= 0xfffffff7;

        kunmap_atomic(page);
        put_page(hpage);
}

static int kvmppc_visible_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
{
        ulong mp_pa = vcpu->arch.magic_page_pa;

        if (!(vcpu->arch.shared->msr & MSR_SF))
                mp_pa = (uint32_t)mp_pa;

        if (unlikely(mp_pa) &&
            unlikely((mp_pa & KVM_PAM) >> PAGE_SHIFT == gfn)) {
                return 1;
        }

        return kvm_is_visible_gfn(vcpu->kvm, gfn);
}

int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu,
                            ulong eaddr, int vec)
{
        bool data = (vec == BOOK3S_INTERRUPT_DATA_STORAGE);
        int r = RESUME_GUEST;
        int relocated;
        int page_found = 0;
        struct kvmppc_pte pte;
        bool is_mmio = false;
        bool dr = (vcpu->arch.shared->msr & MSR_DR) ? true : false;
        bool ir = (vcpu->arch.shared->msr & MSR_IR) ? true : false;
        u64 vsid;

        relocated = data ? dr : ir;

        /* Resolve real address if translation turned on */
        if (relocated) {
                page_found = vcpu->arch.mmu.xlate(vcpu, eaddr, &pte, data);
        } else {
                pte.may_execute = true;
                pte.may_read = true;
                pte.may_write = true;
                pte.raddr = eaddr & KVM_PAM;
                pte.eaddr = eaddr;
                pte.vpage = eaddr >> 12;
        }

        switch (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) {
        case 0:
                pte.vpage |= ((u64)VSID_REAL << (SID_SHIFT - 12));
                break;
        case MSR_DR:
        case MSR_IR:
                vcpu->arch.mmu.esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid);

                if ((vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) == MSR_DR)
                        pte.vpage |= ((u64)VSID_REAL_DR << (SID_SHIFT - 12));
                else
                        pte.vpage |= ((u64)VSID_REAL_IR << (SID_SHIFT - 12));
                pte.vpage |= vsid;

                if (vsid == -1)
                        page_found = -EINVAL;
                break;
        }

        if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
           (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
                /*
                 * If we do the dcbz hack, we have to NX on every execution,
                 * so we can patch the executing code. This renders our guest
                 * NX-less.
                 */
                pte.may_execute = !data;
        }

        if (page_found == -ENOENT) {
                /* Page not found in guest PTE entries */
                struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
                vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
                vcpu->arch.shared->dsisr = svcpu->fault_dsisr;
                vcpu->arch.shared->msr |=
                        (svcpu->shadow_srr1 & 0x00000000f8000000ULL);
                svcpu_put(svcpu);
                kvmppc_book3s_queue_irqprio(vcpu, vec);
        } else if (page_found == -EPERM) {
                /* Storage protection */
                struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
                vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
                vcpu->arch.shared->dsisr = svcpu->fault_dsisr & ~DSISR_NOHPTE;
                vcpu->arch.shared->dsisr |= DSISR_PROTFAULT;
                vcpu->arch.shared->msr |=
                        svcpu->shadow_srr1 & 0x00000000f8000000ULL;
                svcpu_put(svcpu);
                kvmppc_book3s_queue_irqprio(vcpu, vec);
        } else if (page_found == -EINVAL) {
                /* Page not found in guest SLB */
                vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
                kvmppc_book3s_queue_irqprio(vcpu, vec + 0x80);
        } else if (!is_mmio &&
                   kvmppc_visible_gfn(vcpu, pte.raddr >> PAGE_SHIFT)) {
                /* The guest's PTE is not mapped yet. Map on the host */
                kvmppc_mmu_map_page(vcpu, &pte);
                if (data)
                        vcpu->stat.sp_storage++;
                else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
                        (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32)))
                        kvmppc_patch_dcbz(vcpu, &pte);
        } else {
                /* MMIO */
                vcpu->stat.mmio_exits++;
                vcpu->arch.paddr_accessed = pte.raddr;
                vcpu->arch.vaddr_accessed = pte.eaddr;
                r = kvmppc_emulate_mmio(run, vcpu);
                if ( r == RESUME_HOST_NV )
                        r = RESUME_HOST;
        }

        return r;
}

static inline int get_fpr_index(int i)
{
        return i * TS_FPRWIDTH;
}

/* Give up external provider (FPU, Altivec, VSX) */
void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr)
{
        struct thread_struct *t = &current->thread;
        u64 *vcpu_fpr = vcpu->arch.fpr;
#ifdef CONFIG_VSX
        u64 *vcpu_vsx = vcpu->arch.vsr;
#endif
        u64 *thread_fpr = (u64*)t->fpr;
        int i;

        /*
         * VSX instructions can access FP and vector registers, so if
         * we are giving up VSX, make sure we give up FP and VMX as well.
         */
        if (msr & MSR_VSX)
                msr |= MSR_FP | MSR_VEC;

        msr &= vcpu->arch.guest_owned_ext;
        if (!msr)
                return;

#ifdef DEBUG_EXT
        printk(KERN_INFO "Giving up ext 0x%lx\n", msr);
#endif

        if (msr & MSR_FP) {
                /*
                 * Note that on CPUs with VSX, giveup_fpu stores
                 * both the traditional FP registers and the added VSX
                 * registers into thread.fpr[].
                 */
                giveup_fpu(current);
                for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++)
                        vcpu_fpr[i] = thread_fpr[get_fpr_index(i)];

                vcpu->arch.fpscr = t->fpscr.val;

#ifdef CONFIG_VSX
                if (cpu_has_feature(CPU_FTR_VSX))
                        for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr) / 2; i++)
                                vcpu_vsx[i] = thread_fpr[get_fpr_index(i) + 1];
#endif
        }

#ifdef CONFIG_ALTIVEC
        if (msr & MSR_VEC) {
                giveup_altivec(current);
                memcpy(vcpu->arch.vr, t->vr, sizeof(vcpu->arch.vr));
                vcpu->arch.vscr = t->vscr;
        }
#endif

        vcpu->arch.guest_owned_ext &= ~(msr | MSR_VSX);
        kvmppc_recalc_shadow_msr(vcpu);
}

static int kvmppc_read_inst(struct kvm_vcpu *vcpu)
{
        ulong srr0 = kvmppc_get_pc(vcpu);
        u32 last_inst = kvmppc_get_last_inst(vcpu);
        int ret;

        ret = kvmppc_ld(vcpu, &srr0, sizeof(u32), &last_inst, false);
        if (ret == -ENOENT) {
                ulong msr = vcpu->arch.shared->msr;

                msr = kvmppc_set_field(msr, 33, 33, 1);
                msr = kvmppc_set_field(msr, 34, 36, 0);
                vcpu->arch.shared->msr = kvmppc_set_field(msr, 42, 47, 0);
                kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_INST_STORAGE);
                return EMULATE_AGAIN;
        }

        return EMULATE_DONE;
}

static int kvmppc_check_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr)
{

        /* Need to do paired single emulation? */
        if (!(vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE))
                return EMULATE_DONE;

        /* Read out the instruction */
        if (kvmppc_read_inst(vcpu) == EMULATE_DONE)
                /* Need to emulate */
                return EMULATE_FAIL;

        return EMULATE_AGAIN;
}

/* Handle external providers (FPU, Altivec, VSX) */
static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
                             ulong msr)
{
        struct thread_struct *t = &current->thread;
        u64 *vcpu_fpr = vcpu->arch.fpr;
#ifdef CONFIG_VSX
        u64 *vcpu_vsx = vcpu->arch.vsr;
#endif
        u64 *thread_fpr = (u64*)t->fpr;
        int i;

        /* When we have paired singles, we emulate in software */
        if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE)
                return RESUME_GUEST;

        if (!(vcpu->arch.shared->msr & msr)) {
                kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
                return RESUME_GUEST;
        }

        if (msr == MSR_VSX) {
                /* No VSX?  Give an illegal instruction interrupt */
#ifdef CONFIG_VSX
                if (!cpu_has_feature(CPU_FTR_VSX))
#endif
                {
                        kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
                        return RESUME_GUEST;
                }

                /*
                 * We have to load up all the FP and VMX registers before
                 * we can let the guest use VSX instructions.
                 */
                msr = MSR_FP | MSR_VEC | MSR_VSX;
        }

        /* See if we already own all the ext(s) needed */
        msr &= ~vcpu->arch.guest_owned_ext;
        if (!msr)
                return RESUME_GUEST;

#ifdef DEBUG_EXT
        printk(KERN_INFO "Loading up ext 0x%lx\n", msr);
#endif

        current->thread.regs->msr |= msr;

        if (msr & MSR_FP) {
                for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++)
                        thread_fpr[get_fpr_index(i)] = vcpu_fpr[i];
#ifdef CONFIG_VSX
                for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr) / 2; i++)
                        thread_fpr[get_fpr_index(i) + 1] = vcpu_vsx[i];
#endif
                t->fpscr.val = vcpu->arch.fpscr;
                t->fpexc_mode = 0;
                kvmppc_load_up_fpu();
        }

        if (msr & MSR_VEC) {
#ifdef CONFIG_ALTIVEC
                memcpy(t->vr, vcpu->arch.vr, sizeof(vcpu->arch.vr));
                t->vscr = vcpu->arch.vscr;
                t->vrsave = -1;
                kvmppc_load_up_altivec();
#endif
        }

        vcpu->arch.guest_owned_ext |= msr;
        kvmppc_recalc_shadow_msr(vcpu);

        return RESUME_GUEST;
}

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

        vcpu->stat.sum_exits++;

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

        /* We get here with MSR.EE=1 */

        trace_kvm_exit(exit_nr, vcpu);
        kvm_guest_exit();

        switch (exit_nr) {
        case BOOK3S_INTERRUPT_INST_STORAGE:
        {
                struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
                ulong shadow_srr1 = svcpu->shadow_srr1;
                vcpu->stat.pf_instruc++;

#ifdef CONFIG_PPC_BOOK3S_32
                /* We set segments as unused segments when invalidating them. So
                 * treat the respective fault as segment fault. */
                if (svcpu->sr[kvmppc_get_pc(vcpu) >> SID_SHIFT] == SR_INVALID) {
                        kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
                        r = RESUME_GUEST;
                        svcpu_put(svcpu);
                        break;
                }
#endif
                svcpu_put(svcpu);

                /* only care about PTEG not found errors, but leave NX alone */
                if (shadow_srr1 & 0x40000000) {
                        r = kvmppc_handle_pagefault(run, vcpu, kvmppc_get_pc(vcpu), exit_nr);
                        vcpu->stat.sp_instruc++;
                } else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
                          (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
                        /*
                         * XXX If we do the dcbz hack we use the NX bit to flush&patch the page,
                         *     so we can't use the NX bit inside the guest. Let's cross our fingers,
                         *     that no guest that needs the dcbz hack does NX.
                         */
                        kvmppc_mmu_pte_flush(vcpu, kvmppc_get_pc(vcpu), ~0xFFFUL);
                        r = RESUME_GUEST;
                } else {
                        vcpu->arch.shared->msr |= shadow_srr1 & 0x58000000;
                        kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
                        r = RESUME_GUEST;
                }
                break;
        }
        case BOOK3S_INTERRUPT_DATA_STORAGE:
        {
                ulong dar = kvmppc_get_fault_dar(vcpu);
                struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
                u32 fault_dsisr = svcpu->fault_dsisr;
                vcpu->stat.pf_storage++;

#ifdef CONFIG_PPC_BOOK3S_32
                /* We set segments as unused segments when invalidating them. So
                 * treat the respective fault as segment fault. */
                if ((svcpu->sr[dar >> SID_SHIFT]) == SR_INVALID) {
                        kvmppc_mmu_map_segment(vcpu, dar);
                        r = RESUME_GUEST;
                        svcpu_put(svcpu);
                        break;
                }
#endif
                svcpu_put(svcpu);

                /* The only case we need to handle is missing shadow PTEs */
                if (fault_dsisr & DSISR_NOHPTE) {
                        r = kvmppc_handle_pagefault(run, vcpu, dar, exit_nr);
                } else {
                        vcpu->arch.shared->dar = dar;
                        vcpu->arch.shared->dsisr = fault_dsisr;
                        kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
                        r = RESUME_GUEST;
                }
                break;
        }
        case BOOK3S_INTERRUPT_DATA_SEGMENT:
                if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_fault_dar(vcpu)) < 0) {
                        vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
                        kvmppc_book3s_queue_irqprio(vcpu,
                                BOOK3S_INTERRUPT_DATA_SEGMENT);
                }
                r = RESUME_GUEST;
                break;
        case BOOK3S_INTERRUPT_INST_SEGMENT:
                if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu)) < 0) {
                        kvmppc_book3s_queue_irqprio(vcpu,
                                BOOK3S_INTERRUPT_INST_SEGMENT);
                }
                r = RESUME_GUEST;
                break;
        /* We're good on these - the host merely wanted to get our attention */
        case BOOK3S_INTERRUPT_DECREMENTER:
        case BOOK3S_INTERRUPT_HV_DECREMENTER:
                vcpu->stat.dec_exits++;
                r = RESUME_GUEST;
                break;
        case BOOK3S_INTERRUPT_EXTERNAL:
        case BOOK3S_INTERRUPT_EXTERNAL_LEVEL:
        case BOOK3S_INTERRUPT_EXTERNAL_HV:
                vcpu->stat.ext_intr_exits++;
                r = RESUME_GUEST;
                break;
        case BOOK3S_INTERRUPT_PERFMON:
                r = RESUME_GUEST;
                break;
        case BOOK3S_INTERRUPT_PROGRAM:
        case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
        {
                enum emulation_result er;
                struct kvmppc_book3s_shadow_vcpu *svcpu;
                ulong flags;

program_interrupt:
                svcpu = svcpu_get(vcpu);
                flags = svcpu->shadow_srr1 & 0x1f0000ull;
                svcpu_put(svcpu);

                if (vcpu->arch.shared->msr & MSR_PR) {
#ifdef EXIT_DEBUG
                        printk(KERN_INFO "Userspace triggered 0x700 exception at 0x%lx (0x%x)\n", kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu));
#endif
                        if ((kvmppc_get_last_inst(vcpu) & 0xff0007ff) !=
                            (INS_DCBZ & 0xfffffff7)) {
                                kvmppc_core_queue_program(vcpu, flags);
                                r = RESUME_GUEST;
                                break;
                        }
                }

                vcpu->stat.emulated_inst_exits++;
                er = kvmppc_emulate_instruction(run, vcpu);
                switch (er) {
                case EMULATE_DONE:
                        r = RESUME_GUEST_NV;
                        break;
                case EMULATE_AGAIN:
                        r = RESUME_GUEST;
                        break;
                case EMULATE_FAIL:
                        printk(KERN_CRIT "%s: emulation at %lx failed (%08x)\n",
                               __func__, kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu));
                        kvmppc_core_queue_program(vcpu, flags);
                        r = RESUME_GUEST;
                        break;
                case EMULATE_DO_MMIO:
                        run->exit_reason = KVM_EXIT_MMIO;
                        r = RESUME_HOST_NV;
                        break;
                case EMULATE_EXIT_USER:
                        r = RESUME_HOST_NV;
                        break;
                default:
                        BUG();
                }
                break;
        }
        case BOOK3S_INTERRUPT_SYSCALL:
                if (vcpu->arch.papr_enabled &&
                    (kvmppc_get_last_inst(vcpu) == 0x44000022) &&
                    !(vcpu->arch.shared->msr & MSR_PR)) {
                        /* SC 1 papr hypercalls */
                        ulong cmd = kvmppc_get_gpr(vcpu, 3);
                        int i;

#ifdef CONFIG_KVM_BOOK3S_64_PR
                        if (kvmppc_h_pr(vcpu, cmd) == EMULATE_DONE) {
                                r = RESUME_GUEST;
                                break;
                        }
#endif

                        run->papr_hcall.nr = cmd;
                        for (i = 0; i < 9; ++i) {
                                ulong gpr = kvmppc_get_gpr(vcpu, 4 + i);
                                run->papr_hcall.args[i] = gpr;
                        }
                        run->exit_reason = KVM_EXIT_PAPR_HCALL;
                        vcpu->arch.hcall_needed = 1;
                        r = RESUME_HOST;
                } else if (vcpu->arch.osi_enabled &&
                    (((u32)kvmppc_get_gpr(vcpu, 3)) == OSI_SC_MAGIC_R3) &&
                    (((u32)kvmppc_get_gpr(vcpu, 4)) == OSI_SC_MAGIC_R4)) {
                        /* MOL hypercalls */
                        u64 *gprs = run->osi.gprs;
                        int i;

                        run->exit_reason = KVM_EXIT_OSI;
                        for (i = 0; i < 32; i++)
                                gprs[i] = kvmppc_get_gpr(vcpu, i);
                        vcpu->arch.osi_needed = 1;
                        r = RESUME_HOST_NV;
                } else 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 */
                        vcpu->stat.syscall_exits++;
                        kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
                        r = RESUME_GUEST;
                }
                break;
        case BOOK3S_INTERRUPT_FP_UNAVAIL:
        case BOOK3S_INTERRUPT_ALTIVEC:
        case BOOK3S_INTERRUPT_VSX:
        {
                int ext_msr = 0;

                switch (exit_nr) {
                case BOOK3S_INTERRUPT_FP_UNAVAIL: ext_msr = MSR_FP;  break;
                case BOOK3S_INTERRUPT_ALTIVEC:    ext_msr = MSR_VEC; break;
                case BOOK3S_INTERRUPT_VSX:        ext_msr = MSR_VSX; break;
                }

                switch (kvmppc_check_ext(vcpu, exit_nr)) {
                case EMULATE_DONE:
                        /* everything ok - let's enable the ext */
                        r = kvmppc_handle_ext(vcpu, exit_nr, ext_msr);
                        break;
                case EMULATE_FAIL:
                        /* we need to emulate this instruction */
                        goto program_interrupt;
                        break;
                default:
                        /* nothing to worry about - go again */
                        break;
                }
                break;
        }
        case BOOK3S_INTERRUPT_ALIGNMENT:
                if (kvmppc_read_inst(vcpu) == EMULATE_DONE) {
                        vcpu->arch.shared->dsisr = kvmppc_alignment_dsisr(vcpu,
                                kvmppc_get_last_inst(vcpu));
                        vcpu->arch.shared->dar = kvmppc_alignment_dar(vcpu,
                                kvmppc_get_last_inst(vcpu));
                        kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
                }
                r = RESUME_GUEST;
                break;
        case BOOK3S_INTERRUPT_MACHINE_CHECK:
        case BOOK3S_INTERRUPT_TRACE:
                kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
                r = RESUME_GUEST;
                break;
        default:
        {
                struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
                ulong shadow_srr1 = svcpu->shadow_srr1;
                svcpu_put(svcpu);
                /* Ugh - bork here! What did we get? */
                printk(KERN_EMERG "exit_nr=0x%x | pc=0x%lx | msr=0x%lx\n",
                        exit_nr, kvmppc_get_pc(vcpu), shadow_srr1);
                r = RESUME_HOST;
                BUG();
                break;
        }
        }

        if (!(r & RESUME_HOST)) {
                /* To avoid clobbering exit_reason, only check for signals if
                 * we aren't already exiting to userspace for some other
                 * reason. */

                /*
                 * Interrupts could be timers for the guest which we have to
                 * inject again, so let's postpone them until we're in the guest
                 * and if we really did time things so badly, then we just exit
                 * again due to a host external interrupt.
                 */
                local_irq_disable();
                s = kvmppc_prepare_to_enter(vcpu);
                if (s <= 0) {
                        local_irq_enable();
                        r = s;
                } else {
                        kvmppc_lazy_ee_enable();
                }
        }

        trace_kvm_book3s_reenter(r, vcpu);

        return r;
}

int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
                                  struct kvm_sregs *sregs)
{
        struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
        int i;

        sregs->pvr = vcpu->arch.pvr;

        sregs->u.s.sdr1 = to_book3s(vcpu)->sdr1;
        if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
                for (i = 0; i < 64; i++) {
                        sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige | i;
                        sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
                }
        } else {
                for (i = 0; i < 16; i++)
                        sregs->u.s.ppc32.sr[i] = vcpu->arch.shared->sr[i];

                for (i = 0; i < 8; i++) {
                        sregs->u.s.ppc32.ibat[i] = vcpu3s->ibat[i].raw;
                        sregs->u.s.ppc32.dbat[i] = vcpu3s->dbat[i].raw;
                }
        }

        return 0;
}

int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
                                  struct kvm_sregs *sregs)
{
        struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
        int i;

        kvmppc_set_pvr(vcpu, sregs->pvr);

        vcpu3s->sdr1 = sregs->u.s.sdr1;
        if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
                for (i = 0; i < 64; i++) {
                        vcpu->arch.mmu.slbmte(vcpu, sregs->u.s.ppc64.slb[i].slbv,
                                                    sregs->u.s.ppc64.slb[i].slbe);
                }
        } else {
                for (i = 0; i < 16; i++) {
                        vcpu->arch.mmu.mtsrin(vcpu, i, sregs->u.s.ppc32.sr[i]);
                }
                for (i = 0; i < 8; i++) {
                        kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), false,
                                       (u32)sregs->u.s.ppc32.ibat[i]);
                        kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), true,
                                       (u32)(sregs->u.s.ppc32.ibat[i] >> 32));
                        kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), false,
                                       (u32)sregs->u.s.ppc32.dbat[i]);
                        kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), true,
                                       (u32)(sregs->u.s.ppc32.dbat[i] >> 32));
                }
        }

        /* Flush the MMU after messing with the segments */
        kvmppc_mmu_pte_flush(vcpu, 0, 0);

        return 0;
}

int kvmppc_get_one_reg(struct kvm_vcpu *vcpu, u64 id, union kvmppc_one_reg *val)
{
        int r = 0;

        switch (id) {
        case KVM_REG_PPC_HIOR:
                *val = get_reg_val(id, to_book3s(vcpu)->hior);
                break;
#ifdef CONFIG_VSX
        case KVM_REG_PPC_VSR0 ... KVM_REG_PPC_VSR31: {
                long int i = id - KVM_REG_PPC_VSR0;

                if (!cpu_has_feature(CPU_FTR_VSX)) {
                        r = -ENXIO;
                        break;
                }
                val->vsxval[0] = vcpu->arch.fpr[i];
                val->vsxval[1] = vcpu->arch.vsr[i];
                break;
        }
#endif /* CONFIG_VSX */
        default:
                r = -EINVAL;
                break;
        }

        return r;
}

int kvmppc_set_one_reg(struct kvm_vcpu *vcpu, u64 id, union kvmppc_one_reg *val)
{
        int r = 0;

        switch (id) {
        case KVM_REG_PPC_HIOR:
                to_book3s(vcpu)->hior = set_reg_val(id, *val);
                to_book3s(vcpu)->hior_explicit = true;
                break;
#ifdef CONFIG_VSX
        case KVM_REG_PPC_VSR0 ... KVM_REG_PPC_VSR31: {
                long int i = id - KVM_REG_PPC_VSR0;

                if (!cpu_has_feature(CPU_FTR_VSX)) {
                        r = -ENXIO;
                        break;
                }
                vcpu->arch.fpr[i] = val->vsxval[0];
                vcpu->arch.vsr[i] = val->vsxval[1];
                break;
        }
#endif /* CONFIG_VSX */
        default:
                r = -EINVAL;
                break;
        }

        return r;
}

int kvmppc_core_check_processor_compat(void)
{
        return 0;
}

struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
{
        struct kvmppc_vcpu_book3s *vcpu_book3s;
        struct kvm_vcpu *vcpu;
        int err = -ENOMEM;
        unsigned long p;

        vcpu_book3s = vzalloc(sizeof(struct kvmppc_vcpu_book3s));
        if (!vcpu_book3s)
                goto out;

        vcpu_book3s->shadow_vcpu =
                kzalloc(sizeof(*vcpu_book3s->shadow_vcpu), GFP_KERNEL);
        if (!vcpu_book3s->shadow_vcpu)
                goto free_vcpu;

        vcpu = &vcpu_book3s->vcpu;
        err = kvm_vcpu_init(vcpu, kvm, id);
        if (err)
                goto free_shadow_vcpu;

        err = -ENOMEM;
        p = __get_free_page(GFP_KERNEL|__GFP_ZERO);
        if (!p)
                goto uninit_vcpu;
        /* the real shared page fills the last 4k of our page */
        vcpu->arch.shared = (void *)(p + PAGE_SIZE - 4096);

#ifdef CONFIG_PPC_BOOK3S_64
        /* default to book3s_64 (970fx) */
        vcpu->arch.pvr = 0x3C0301;
#else
        /* default to book3s_32 (750) */
        vcpu->arch.pvr = 0x84202;
#endif
        kvmppc_set_pvr(vcpu, vcpu->arch.pvr);
        vcpu->arch.slb_nr = 64;

        vcpu->arch.shadow_msr = MSR_USER64;

        err = kvmppc_mmu_init(vcpu);
        if (err < 0)
                goto uninit_vcpu;

        return vcpu;

uninit_vcpu:
        kvm_vcpu_uninit(vcpu);
free_shadow_vcpu:
        kfree(vcpu_book3s->shadow_vcpu);
free_vcpu:
        vfree(vcpu_book3s);
out:
        return ERR_PTR(err);
}

void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
{
        struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);

        free_page((unsigned long)vcpu->arch.shared & PAGE_MASK);
        kvm_vcpu_uninit(vcpu);
        kfree(vcpu_book3s->shadow_vcpu);
        vfree(vcpu_book3s);
}

int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
{
        int ret;
        double fpr[32][TS_FPRWIDTH];
        unsigned int fpscr;
        int fpexc_mode;
#ifdef CONFIG_ALTIVEC
        vector128 vr[32];
        vector128 vscr;
        unsigned long uninitialized_var(vrsave);
        int used_vr;
#endif
#ifdef CONFIG_VSX
        int used_vsr;
#endif
        ulong ext_msr;

        /* Check if we can run the vcpu at all */
        if (!vcpu->arch.sane) {
                kvm_run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
                ret = -EINVAL;
                goto out;
        }

        /*
         * Interrupts could be timers for the guest which we have to inject
         * again, so let's postpone them until we're in the guest and if we
         * really did time things so badly, then we just exit again due to
         * a host external interrupt.
         */
        local_irq_disable();
        ret = kvmppc_prepare_to_enter(vcpu);
        if (ret <= 0) {
                local_irq_enable();
                goto out;
        }

        /* Save FPU state in stack */
        if (current->thread.regs->msr & MSR_FP)
                giveup_fpu(current);
        memcpy(fpr, current->thread.fpr, sizeof(current->thread.fpr));
        fpscr = current->thread.fpscr.val;
        fpexc_mode = current->thread.fpexc_mode;

#ifdef CONFIG_ALTIVEC
        /* Save Altivec state in stack */
        used_vr = current->thread.used_vr;
        if (used_vr) {
                if (current->thread.regs->msr & MSR_VEC)
                        giveup_altivec(current);
                memcpy(vr, current->thread.vr, sizeof(current->thread.vr));
                vscr = current->thread.vscr;
                vrsave = current->thread.vrsave;
        }
#endif

#ifdef CONFIG_VSX
        /* Save VSX state in stack */
        used_vsr = current->thread.used_vsr;
        if (used_vsr && (current->thread.regs->msr & MSR_VSX))
                __giveup_vsx(current);
#endif

        /* Remember the MSR with disabled extensions */
        ext_msr = current->thread.regs->msr;

        /* Preload FPU if it's enabled */
        if (vcpu->arch.shared->msr & MSR_FP)
                kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);

        kvmppc_lazy_ee_enable();

        ret = __kvmppc_vcpu_run(kvm_run, vcpu);

        /* No need for kvm_guest_exit. It's done in handle_exit.
           We also get here with interrupts enabled. */

        /* Make sure we save the guest FPU/Altivec/VSX state */
        kvmppc_giveup_ext(vcpu, MSR_FP | MSR_VEC | MSR_VSX);

        current->thread.regs->msr = ext_msr;

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

#ifdef CONFIG_ALTIVEC
        /* Restore Altivec state from stack */
        if (used_vr && current->thread.used_vr) {
                memcpy(current->thread.vr, vr, sizeof(current->thread.vr));
                current->thread.vscr = vscr;
                current->thread.vrsave = vrsave;
        }
        current->thread.used_vr = used_vr;
#endif

#ifdef CONFIG_VSX
        current->thread.used_vsr = used_vsr;
#endif

out:
        vcpu->mode = OUTSIDE_GUEST_MODE;
        return ret;
}

/*
 * Get (and clear) the dirty memory log for a memory slot.
 */
int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
                                      struct kvm_dirty_log *log)
{
        struct kvm_memory_slot *memslot;
        struct kvm_vcpu *vcpu;
        ulong ga, ga_end;
        int is_dirty = 0;
        int r;
        unsigned long n;

        mutex_lock(&kvm->slots_lock);

        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) {
                memslot = id_to_memslot(kvm->memslots, log->slot);

                ga = memslot->base_gfn << PAGE_SHIFT;
                ga_end = ga + (memslot->npages << PAGE_SHIFT);

                kvm_for_each_vcpu(n, vcpu, kvm)
                        kvmppc_mmu_pte_pflush(vcpu, ga, ga_end);

                n = kvm_dirty_bitmap_bytes(memslot);
                memset(memslot->dirty_bitmap, 0, n);
        }

        r = 0;
out:
        mutex_unlock(&kvm->slots_lock);
        return r;
}

#ifdef CONFIG_PPC64
int kvm_vm_ioctl_get_smmu_info(struct kvm *kvm, struct kvm_ppc_smmu_info *info)
{
        info->flags = KVM_PPC_1T_SEGMENTS;

        /* SLB is always 64 entries */
        info->slb_size = 64;

        /* Standard 4k base page size segment */
        info->sps[0].page_shift = 12;
        info->sps[0].slb_enc = 0;
        info->sps[0].enc[0].page_shift = 12;
        info->sps[0].enc[0].pte_enc = 0;

        /* Standard 16M large page size segment */
        info->sps[1].page_shift = 24;
        info->sps[1].slb_enc = SLB_VSID_L;
        info->sps[1].enc[0].page_shift = 24;
        info->sps[1].enc[0].pte_enc = 0;

        return 0;
}
#endif /* CONFIG_PPC64 */

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

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

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

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

void kvmppc_core_flush_memslot(struct kvm *kvm, struct kvm_memory_slot *memslot)
{
}

static unsigned int kvm_global_user_count = 0;
static DEFINE_SPINLOCK(kvm_global_user_count_lock);

int kvmppc_core_init_vm(struct kvm *kvm)
{
#ifdef CONFIG_PPC64
        INIT_LIST_HEAD(&kvm->arch.spapr_tce_tables);
        INIT_LIST_HEAD(&kvm->arch.rtas_tokens);
#endif

        if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
                spin_lock(&kvm_global_user_count_lock);
                if (++kvm_global_user_count == 1)
                        pSeries_disable_reloc_on_exc();
                spin_unlock(&kvm_global_user_count_lock);
        }
        return 0;
}

void kvmppc_core_destroy_vm(struct kvm *kvm)
{
#ifdef CONFIG_PPC64
        WARN_ON(!list_empty(&kvm->arch.spapr_tce_tables));
#endif

        if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
                spin_lock(&kvm_global_user_count_lock);
                BUG_ON(kvm_global_user_count == 0);
                if (--kvm_global_user_count == 0)
                        pSeries_enable_reloc_on_exc();
                spin_unlock(&kvm_global_user_count_lock);
        }
}

static int kvmppc_book3s_init(void)
{
        int r;

        r = kvm_init(NULL, sizeof(struct kvmppc_vcpu_book3s), 0,
                     THIS_MODULE);

        if (r)
                return r;

        r = kvmppc_mmu_hpte_sysinit();

        return r;
}

static void kvmppc_book3s_exit(void)
{
        kvmppc_mmu_hpte_sysexit();
        kvm_exit();
}

module_init(kvmppc_book3s_init);
module_exit(kvmppc_book3s_exit);