KVM: add kvm_{test,clear}_request to replace {test,clear}_bit

[mirror_ubuntu-artful-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 <linux/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/setup.h>
#include <linux/gfp.h>
#include <linux/sched.h>
#include <linux/vmalloc.h>
#include <linux/highmem.h>
#include <linux/module.h>
#include <linux/miscdevice.h>

#include "book3s.h"

#define CREATE_TRACE_POINTS
#include "trace_pr.h"

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

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

/* 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

static bool kvmppc_is_split_real(struct kvm_vcpu *vcpu)
{
        ulong msr = kvmppc_get_msr(vcpu);
        return (msr & (MSR_IR|MSR_DR)) == MSR_DR;
}

static void kvmppc_fixup_split_real(struct kvm_vcpu *vcpu)
{
        ulong msr = kvmppc_get_msr(vcpu);
        ulong pc = kvmppc_get_pc(vcpu);

        /* We are in DR only split real mode */
        if ((msr & (MSR_IR|MSR_DR)) != MSR_DR)
                return;

        /* We have not fixed up the guest already */
        if (vcpu->arch.hflags & BOOK3S_HFLAG_SPLIT_HACK)
                return;

        /* The code is in fixupable address space */
        if (pc & SPLIT_HACK_MASK)
                return;

        vcpu->arch.hflags |= BOOK3S_HFLAG_SPLIT_HACK;
        kvmppc_set_pc(vcpu, pc | SPLIT_HACK_OFFS);
}

void kvmppc_unfixup_split_real(struct kvm_vcpu *vcpu);

static void kvmppc_core_vcpu_load_pr(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));
        svcpu->slb_max = to_book3s(vcpu)->slb_shadow_max;
        svcpu->in_use = 0;
        svcpu_put(svcpu);
#endif

        /* Disable AIL if supported */
        if (cpu_has_feature(CPU_FTR_HVMODE) &&
            cpu_has_feature(CPU_FTR_ARCH_207S))
                mtspr(SPRN_LPCR, mfspr(SPRN_LPCR) & ~LPCR_AIL);

        vcpu->cpu = smp_processor_id();
#ifdef CONFIG_PPC_BOOK3S_32
        current->thread.kvm_shadow_vcpu = vcpu->arch.shadow_vcpu;
#endif

        if (kvmppc_is_split_real(vcpu))
                kvmppc_fixup_split_real(vcpu);
}

static void kvmppc_core_vcpu_put_pr(struct kvm_vcpu *vcpu)
{
#ifdef CONFIG_PPC_BOOK3S_64
        struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
        if (svcpu->in_use) {
                kvmppc_copy_from_svcpu(vcpu, svcpu);
        }
        memcpy(to_book3s(vcpu)->slb_shadow, svcpu->slb, sizeof(svcpu->slb));
        to_book3s(vcpu)->slb_shadow_max = svcpu->slb_max;
        svcpu_put(svcpu);
#endif

        if (kvmppc_is_split_real(vcpu))
                kvmppc_unfixup_split_real(vcpu);

        kvmppc_giveup_ext(vcpu, MSR_FP | MSR_VEC | MSR_VSX);
        kvmppc_giveup_fac(vcpu, FSCR_TAR_LG);

        /* Enable AIL if supported */
        if (cpu_has_feature(CPU_FTR_HVMODE) &&
            cpu_has_feature(CPU_FTR_ARCH_207S))
                mtspr(SPRN_LPCR, mfspr(SPRN_LPCR) | LPCR_AIL_3);

        vcpu->cpu = -1;
}

/* Copy data needed by real-mode code from vcpu to shadow vcpu */
void kvmppc_copy_to_svcpu(struct kvmppc_book3s_shadow_vcpu *svcpu,
                          struct kvm_vcpu *vcpu)
{
        svcpu->gpr[0] = vcpu->arch.gpr[0];
        svcpu->gpr[1] = vcpu->arch.gpr[1];
        svcpu->gpr[2] = vcpu->arch.gpr[2];
        svcpu->gpr[3] = vcpu->arch.gpr[3];
        svcpu->gpr[4] = vcpu->arch.gpr[4];
        svcpu->gpr[5] = vcpu->arch.gpr[5];
        svcpu->gpr[6] = vcpu->arch.gpr[6];
        svcpu->gpr[7] = vcpu->arch.gpr[7];
        svcpu->gpr[8] = vcpu->arch.gpr[8];
        svcpu->gpr[9] = vcpu->arch.gpr[9];
        svcpu->gpr[10] = vcpu->arch.gpr[10];
        svcpu->gpr[11] = vcpu->arch.gpr[11];
        svcpu->gpr[12] = vcpu->arch.gpr[12];
        svcpu->gpr[13] = vcpu->arch.gpr[13];
        svcpu->cr  = vcpu->arch.cr;
        svcpu->xer = vcpu->arch.xer;
        svcpu->ctr = vcpu->arch.ctr;
        svcpu->lr  = vcpu->arch.lr;
        svcpu->pc  = vcpu->arch.pc;
#ifdef CONFIG_PPC_BOOK3S_64
        svcpu->shadow_fscr = vcpu->arch.shadow_fscr;
#endif
        /*
         * Now also save the current time base value. We use this
         * to find the guest purr and spurr value.
         */
        vcpu->arch.entry_tb = get_tb();
        vcpu->arch.entry_vtb = get_vtb();
        if (cpu_has_feature(CPU_FTR_ARCH_207S))
                vcpu->arch.entry_ic = mfspr(SPRN_IC);
        svcpu->in_use = true;
}

/* Copy data touched by real-mode code from shadow vcpu back to vcpu */
void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu,
                            struct kvmppc_book3s_shadow_vcpu *svcpu)
{
        /*
         * vcpu_put would just call us again because in_use hasn't
         * been updated yet.
         */
        preempt_disable();

        /*
         * Maybe we were already preempted and synced the svcpu from
         * our preempt notifiers. Don't bother touching this svcpu then.
         */
        if (!svcpu->in_use)
                goto out;

        vcpu->arch.gpr[0] = svcpu->gpr[0];
        vcpu->arch.gpr[1] = svcpu->gpr[1];
        vcpu->arch.gpr[2] = svcpu->gpr[2];
        vcpu->arch.gpr[3] = svcpu->gpr[3];
        vcpu->arch.gpr[4] = svcpu->gpr[4];
        vcpu->arch.gpr[5] = svcpu->gpr[5];
        vcpu->arch.gpr[6] = svcpu->gpr[6];
        vcpu->arch.gpr[7] = svcpu->gpr[7];
        vcpu->arch.gpr[8] = svcpu->gpr[8];
        vcpu->arch.gpr[9] = svcpu->gpr[9];
        vcpu->arch.gpr[10] = svcpu->gpr[10];
        vcpu->arch.gpr[11] = svcpu->gpr[11];
        vcpu->arch.gpr[12] = svcpu->gpr[12];
        vcpu->arch.gpr[13] = svcpu->gpr[13];
        vcpu->arch.cr  = svcpu->cr;
        vcpu->arch.xer = svcpu->xer;
        vcpu->arch.ctr = svcpu->ctr;
        vcpu->arch.lr  = svcpu->lr;
        vcpu->arch.pc  = svcpu->pc;
        vcpu->arch.shadow_srr1 = svcpu->shadow_srr1;
        vcpu->arch.fault_dar   = svcpu->fault_dar;
        vcpu->arch.fault_dsisr = svcpu->fault_dsisr;
        vcpu->arch.last_inst   = svcpu->last_inst;
#ifdef CONFIG_PPC_BOOK3S_64
        vcpu->arch.shadow_fscr = svcpu->shadow_fscr;
#endif
        /*
         * Update purr and spurr using time base on exit.
         */
        vcpu->arch.purr += get_tb() - vcpu->arch.entry_tb;
        vcpu->arch.spurr += get_tb() - vcpu->arch.entry_tb;
        to_book3s(vcpu)->vtb += get_vtb() - vcpu->arch.entry_vtb;
        if (cpu_has_feature(CPU_FTR_ARCH_207S))
                vcpu->arch.ic += mfspr(SPRN_IC) - vcpu->arch.entry_ic;
        svcpu->in_use = false;

out:
        preempt_enable();
}

static int kvmppc_core_check_requests_pr(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 *************/
static void do_kvm_unmap_hva(struct kvm *kvm, unsigned long start,
                             unsigned long end)
{
        long i;
        struct kvm_vcpu *vcpu;
        struct kvm_memslots *slots;
        struct kvm_memory_slot *memslot;

        slots = kvm_memslots(kvm);
        kvm_for_each_memslot(memslot, slots) {
                unsigned long hva_start, hva_end;
                gfn_t gfn, gfn_end;

                hva_start = max(start, memslot->userspace_addr);
                hva_end = min(end, memslot->userspace_addr +
                                        (memslot->npages << PAGE_SHIFT));
                if (hva_start >= hva_end)
                        continue;
                /*
                 * {gfn(page) | page intersects with [hva_start, hva_end)} =
                 * {gfn, gfn+1, ..., gfn_end-1}.
                 */
                gfn = hva_to_gfn_memslot(hva_start, memslot);
                gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot);
                kvm_for_each_vcpu(i, vcpu, kvm)
                        kvmppc_mmu_pte_pflush(vcpu, gfn << PAGE_SHIFT,
                                              gfn_end << PAGE_SHIFT);
        }
}

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

        do_kvm_unmap_hva(kvm, hva, hva + PAGE_SIZE);

        return 0;
}

static int kvm_unmap_hva_range_pr(struct kvm *kvm, unsigned long start,
                                  unsigned long end)
{
        do_kvm_unmap_hva(kvm, start, end);

        return 0;
}

static int kvm_age_hva_pr(struct kvm *kvm, unsigned long start,
                          unsigned long end)
{
        /* XXX could be more clever ;) */
        return 0;
}

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

static void kvm_set_spte_hva_pr(struct kvm *kvm, unsigned long hva, pte_t pte)
{
        /* The page will get remapped properly on its next fault */
        do_kvm_unmap_hva(kvm, hva, hva + PAGE_SIZE);
}

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

static void kvmppc_recalc_shadow_msr(struct kvm_vcpu *vcpu)
{
        ulong guest_msr = kvmppc_get_msr(vcpu);
        ulong smsr = guest_msr;

        /* Guest MSR values */
        smsr &= MSR_FE0 | MSR_FE1 | MSR_SF | MSR_SE | MSR_BE | MSR_LE;
        /* Process MSR values */
        smsr |= MSR_ME | MSR_RI | MSR_IR | MSR_DR | MSR_PR | MSR_EE;
        /* External providers the guest reserved */
        smsr |= (guest_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;
}

static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
{
        ulong old_msr = kvmppc_get_msr(vcpu);

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

        msr &= to_book3s(vcpu)->msr_mask;
        kvmppc_set_msr_fast(vcpu, msr);
        kvmppc_recalc_shadow_msr(vcpu);

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

                        /* Unset POW bit after we woke up */
                        msr &= ~MSR_POW;
                        kvmppc_set_msr_fast(vcpu, msr);
                }
        }

        if (kvmppc_is_split_real(vcpu))
                kvmppc_fixup_split_real(vcpu);
        else
                kvmppc_unfixup_split_real(vcpu);

        if ((kvmppc_get_msr(vcpu) & (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 (kvmppc_get_msr(vcpu) & MSR_FP)
                kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
}

void kvmppc_set_pvr_pr(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);

        /*
         * If they're asking for POWER6 or later, set the flag
         * indicating that we can do multiple large page sizes
         * and 1TB segments.
         * Also set the flag that indicates that tlbie has the large
         * page bit in the RB operand instead of the instruction.
         */
        switch (PVR_VER(pvr)) {
        case PVR_POWER6:
        case PVR_POWER7:
        case PVR_POWER7p:
        case PVR_POWER8:
        case PVR_POWER8E:
        case PVR_POWER8NVL:
                vcpu->arch.hflags |= BOOK3S_HFLAG_MULTI_PGSIZE |
                        BOOK3S_HFLAG_NEW_TLBIE;
                break;
        }

#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 ((be32_to_cpu(page[i]) & 0xff0007ff) == INS_DCBZ)
                        page[i] &= cpu_to_be32(0xfffffff7);

        kunmap_atomic(page);
        put_page(hpage);
}

static bool kvmppc_visible_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
{
        ulong mp_pa = vcpu->arch.magic_page_pa;

        if (!(kvmppc_get_msr(vcpu) & MSR_SF))
                mp_pa = (uint32_t)mp_pa;

        gpa &= ~0xFFFULL;
        if (unlikely(mp_pa) && unlikely((mp_pa & KVM_PAM) == (gpa & KVM_PAM))) {
                return true;
        }

        return kvm_is_visible_gfn(vcpu->kvm, gpa >> PAGE_SHIFT);
}

int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu,
                            ulong eaddr, int vec)
{
        bool data = (vec == BOOK3S_INTERRUPT_DATA_STORAGE);
        bool iswrite = false;
        int r = RESUME_GUEST;
        int relocated;
        int page_found = 0;
        struct kvmppc_pte pte = { 0 };
        bool dr = (kvmppc_get_msr(vcpu) & MSR_DR) ? true : false;
        bool ir = (kvmppc_get_msr(vcpu) & MSR_IR) ? true : false;
        u64 vsid;

        relocated = data ? dr : ir;
        if (data && (vcpu->arch.fault_dsisr & DSISR_ISSTORE))
                iswrite = true;

        /* Resolve real address if translation turned on */
        if (relocated) {
                page_found = vcpu->arch.mmu.xlate(vcpu, eaddr, &pte, data, iswrite);
        } 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;
                pte.page_size = MMU_PAGE_64K;
        }

        switch (kvmppc_get_msr(vcpu) & (MSR_DR|MSR_IR)) {
        case 0:
                pte.vpage |= ((u64)VSID_REAL << (SID_SHIFT - 12));
                break;
        case MSR_DR:
                if (!data &&
                    (vcpu->arch.hflags & BOOK3S_HFLAG_SPLIT_HACK) &&
                    ((pte.raddr & SPLIT_HACK_MASK) == SPLIT_HACK_OFFS))
                        pte.raddr &= ~SPLIT_HACK_MASK;
                /* fall through */
        case MSR_IR:
                vcpu->arch.mmu.esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid);

                if ((kvmppc_get_msr(vcpu) & (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 */
                u64 ssrr1 = vcpu->arch.shadow_srr1;
                u64 msr = kvmppc_get_msr(vcpu);
                kvmppc_set_dar(vcpu, kvmppc_get_fault_dar(vcpu));
                kvmppc_set_dsisr(vcpu, vcpu->arch.fault_dsisr);
                kvmppc_set_msr_fast(vcpu, msr | (ssrr1 & 0xf8000000ULL));
                kvmppc_book3s_queue_irqprio(vcpu, vec);
        } else if (page_found == -EPERM) {
                /* Storage protection */
                u32 dsisr = vcpu->arch.fault_dsisr;
                u64 ssrr1 = vcpu->arch.shadow_srr1;
                u64 msr = kvmppc_get_msr(vcpu);
                kvmppc_set_dar(vcpu, kvmppc_get_fault_dar(vcpu));
                dsisr = (dsisr & ~DSISR_NOHPTE) | DSISR_PROTFAULT;
                kvmppc_set_dsisr(vcpu, dsisr);
                kvmppc_set_msr_fast(vcpu, msr | (ssrr1 & 0xf8000000ULL));
                kvmppc_book3s_queue_irqprio(vcpu, vec);
        } else if (page_found == -EINVAL) {
                /* Page not found in guest SLB */
                kvmppc_set_dar(vcpu, kvmppc_get_fault_dar(vcpu));
                kvmppc_book3s_queue_irqprio(vcpu, vec + 0x80);
        } else if (kvmppc_visible_gpa(vcpu, pte.raddr)) {
                if (data && !(vcpu->arch.fault_dsisr & DSISR_NOHPTE)) {
                        /*
                         * There is already a host HPTE there, presumably
                         * a read-only one for a page the guest thinks
                         * is writable, so get rid of it first.
                         */
                        kvmppc_mmu_unmap_page(vcpu, &pte);
                }
                /* The guest's PTE is not mapped yet. Map on the host */
                if (kvmppc_mmu_map_page(vcpu, &pte, iswrite) == -EIO) {
                        /* Exit KVM if mapping failed */
                        run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
                        return RESUME_HOST;
                }
                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;
}

/* Give up external provider (FPU, Altivec, VSX) */
void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr)
{
        struct thread_struct *t = &current->thread;

        /*
         * 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.fp_state.fpr[].
                 */
                if (t->regs->msr & MSR_FP)
                        giveup_fpu(current);
                t->fp_save_area = NULL;
        }

#ifdef CONFIG_ALTIVEC
        if (msr & MSR_VEC) {
                if (current->thread.regs->msr & MSR_VEC)
                        giveup_altivec(current);
                t->vr_save_area = NULL;
        }
#endif

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

/* Give up facility (TAR / EBB / DSCR) */
static void kvmppc_giveup_fac(struct kvm_vcpu *vcpu, ulong fac)
{
#ifdef CONFIG_PPC_BOOK3S_64
        if (!(vcpu->arch.shadow_fscr & (1ULL << fac))) {
                /* Facility not available to the guest, ignore giveup request*/
                return;
        }

        switch (fac) {
        case FSCR_TAR_LG:
                vcpu->arch.tar = mfspr(SPRN_TAR);
                mtspr(SPRN_TAR, current->thread.tar);
                vcpu->arch.shadow_fscr &= ~FSCR_TAR;
                break;
        }
#endif
}

/* 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;

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

        if (!(kvmppc_get_msr(vcpu) & 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

        if (msr & MSR_FP) {
                preempt_disable();
                enable_kernel_fp();
                load_fp_state(&vcpu->arch.fp);
                disable_kernel_fp();
                t->fp_save_area = &vcpu->arch.fp;
                preempt_enable();
        }

        if (msr & MSR_VEC) {
#ifdef CONFIG_ALTIVEC
                preempt_disable();
                enable_kernel_altivec();
                load_vr_state(&vcpu->arch.vr);
                disable_kernel_altivec();
                t->vr_save_area = &vcpu->arch.vr;
                preempt_enable();
#endif
        }

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

        return RESUME_GUEST;
}

/*
 * Kernel code using FP or VMX could have flushed guest state to
 * the thread_struct; if so, get it back now.
 */
static void kvmppc_handle_lost_ext(struct kvm_vcpu *vcpu)
{
        unsigned long lost_ext;

        lost_ext = vcpu->arch.guest_owned_ext & ~current->thread.regs->msr;
        if (!lost_ext)
                return;

        if (lost_ext & MSR_FP) {
                preempt_disable();
                enable_kernel_fp();
                load_fp_state(&vcpu->arch.fp);
                disable_kernel_fp();
                preempt_enable();
        }
#ifdef CONFIG_ALTIVEC
        if (lost_ext & MSR_VEC) {
                preempt_disable();
                enable_kernel_altivec();
                load_vr_state(&vcpu->arch.vr);
                disable_kernel_altivec();
                preempt_enable();
        }
#endif
        current->thread.regs->msr |= lost_ext;
}

#ifdef CONFIG_PPC_BOOK3S_64

static void kvmppc_trigger_fac_interrupt(struct kvm_vcpu *vcpu, ulong fac)
{
        /* Inject the Interrupt Cause field and trigger a guest interrupt */
        vcpu->arch.fscr &= ~(0xffULL << 56);
        vcpu->arch.fscr |= (fac << 56);
        kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_FAC_UNAVAIL);
}

static void kvmppc_emulate_fac(struct kvm_vcpu *vcpu, ulong fac)
{
        enum emulation_result er = EMULATE_FAIL;

        if (!(kvmppc_get_msr(vcpu) & MSR_PR))
                er = kvmppc_emulate_instruction(vcpu->run, vcpu);

        if ((er != EMULATE_DONE) && (er != EMULATE_AGAIN)) {
                /* Couldn't emulate, trigger interrupt in guest */
                kvmppc_trigger_fac_interrupt(vcpu, fac);
        }
}

/* Enable facilities (TAR, EBB, DSCR) for the guest */
static int kvmppc_handle_fac(struct kvm_vcpu *vcpu, ulong fac)
{
        bool guest_fac_enabled;
        BUG_ON(!cpu_has_feature(CPU_FTR_ARCH_207S));

        /*
         * Not every facility is enabled by FSCR bits, check whether the
         * guest has this facility enabled at all.
         */
        switch (fac) {
        case FSCR_TAR_LG:
        case FSCR_EBB_LG:
                guest_fac_enabled = (vcpu->arch.fscr & (1ULL << fac));
                break;
        case FSCR_TM_LG:
                guest_fac_enabled = kvmppc_get_msr(vcpu) & MSR_TM;
                break;
        default:
                guest_fac_enabled = false;
                break;
        }

        if (!guest_fac_enabled) {
                /* Facility not enabled by the guest */
                kvmppc_trigger_fac_interrupt(vcpu, fac);
                return RESUME_GUEST;
        }

        switch (fac) {
        case FSCR_TAR_LG:
                /* TAR switching isn't lazy in Linux yet */
                current->thread.tar = mfspr(SPRN_TAR);
                mtspr(SPRN_TAR, vcpu->arch.tar);
                vcpu->arch.shadow_fscr |= FSCR_TAR;
                break;
        default:
                kvmppc_emulate_fac(vcpu, fac);
                break;
        }

        return RESUME_GUEST;
}

void kvmppc_set_fscr(struct kvm_vcpu *vcpu, u64 fscr)
{
        if ((vcpu->arch.fscr & FSCR_TAR) && !(fscr & FSCR_TAR)) {
                /* TAR got dropped, drop it in shadow too */
                kvmppc_giveup_fac(vcpu, FSCR_TAR_LG);
        }
        vcpu->arch.fscr = fscr;
}
#endif

static void kvmppc_setup_debug(struct kvm_vcpu *vcpu)
{
        if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {
                u64 msr = kvmppc_get_msr(vcpu);

                kvmppc_set_msr(vcpu, msr | MSR_SE);
        }
}

static void kvmppc_clear_debug(struct kvm_vcpu *vcpu)
{
        if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {
                u64 msr = kvmppc_get_msr(vcpu);

                kvmppc_set_msr(vcpu, msr & ~MSR_SE);
        }
}

static int kvmppc_exit_pr_progint(struct kvm_run *run, struct kvm_vcpu *vcpu,
                                  unsigned int exit_nr)
{
        enum emulation_result er;
        ulong flags;
        u32 last_inst;
        int emul, r;

        /*
         * shadow_srr1 only contains valid flags if we came here via a program
         * exception. The other exceptions (emulation assist, FP unavailable,
         * etc.) do not provide flags in SRR1, so use an illegal-instruction
         * exception when injecting a program interrupt into the guest.
         */
        if (exit_nr == BOOK3S_INTERRUPT_PROGRAM)
                flags = vcpu->arch.shadow_srr1 & 0x1f0000ull;
        else
                flags = SRR1_PROGILL;

        emul = kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst);
        if (emul != EMULATE_DONE)
                return RESUME_GUEST;

        if (kvmppc_get_msr(vcpu) & MSR_PR) {
#ifdef EXIT_DEBUG
                pr_info("Userspace triggered 0x700 exception at\n 0x%lx (0x%x)\n",
                        kvmppc_get_pc(vcpu), last_inst);
#endif
                if ((last_inst & 0xff0007ff) != (INS_DCBZ & 0xfffffff7)) {
                        kvmppc_core_queue_program(vcpu, flags);
                        return RESUME_GUEST;
                }
        }

        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:
                pr_crit("%s: emulation at %lx failed (%08x)\n",
                        __func__, kvmppc_get_pc(vcpu), last_inst);
                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();
        }

        return r;
}

int kvmppc_handle_exit_pr(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);
        guest_exit();

        switch (exit_nr) {
        case BOOK3S_INTERRUPT_INST_STORAGE:
        {
                ulong shadow_srr1 = vcpu->arch.shadow_srr1;
                vcpu->stat.pf_instruc++;

                if (kvmppc_is_split_real(vcpu))
                        kvmppc_fixup_split_real(vcpu);

#ifdef CONFIG_PPC_BOOK3S_32
                /* We set segments as unused segments when invalidating them. So
                 * treat the respective fault as segment fault. */
                {
                        struct kvmppc_book3s_shadow_vcpu *svcpu;
                        u32 sr;

                        svcpu = svcpu_get(vcpu);
                        sr = svcpu->sr[kvmppc_get_pc(vcpu) >> SID_SHIFT];
                        svcpu_put(svcpu);
                        if (sr == SR_INVALID) {
                                kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
                                r = RESUME_GUEST;
                                break;
                        }
                }
#endif

                /* only care about PTEG not found errors, but leave NX alone */
                if (shadow_srr1 & 0x40000000) {
                        int idx = srcu_read_lock(&vcpu->kvm->srcu);
                        r = kvmppc_handle_pagefault(run, vcpu, kvmppc_get_pc(vcpu), exit_nr);
                        srcu_read_unlock(&vcpu->kvm->srcu, idx);
                        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 {
                        u64 msr = kvmppc_get_msr(vcpu);
                        msr |= shadow_srr1 & 0x58000000;
                        kvmppc_set_msr_fast(vcpu, msr);
                        kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
                        r = RESUME_GUEST;
                }
                break;
        }
        case BOOK3S_INTERRUPT_DATA_STORAGE:
        {
                ulong dar = kvmppc_get_fault_dar(vcpu);
                u32 fault_dsisr = vcpu->arch.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. */
                {
                        struct kvmppc_book3s_shadow_vcpu *svcpu;
                        u32 sr;

                        svcpu = svcpu_get(vcpu);
                        sr = svcpu->sr[dar >> SID_SHIFT];
                        svcpu_put(svcpu);
                        if (sr == SR_INVALID) {
                                kvmppc_mmu_map_segment(vcpu, dar);
                                r = RESUME_GUEST;
                                break;
                        }
                }
#endif

                /*
                 * We need to handle missing shadow PTEs, and
                 * protection faults due to us mapping a page read-only
                 * when the guest thinks it is writable.
                 */
                if (fault_dsisr & (DSISR_NOHPTE | DSISR_PROTFAULT)) {
                        int idx = srcu_read_lock(&vcpu->kvm->srcu);
                        r = kvmppc_handle_pagefault(run, vcpu, dar, exit_nr);
                        srcu_read_unlock(&vcpu->kvm->srcu, idx);
                } else {
                        kvmppc_set_dar(vcpu, dar);
                        kvmppc_set_dsisr(vcpu, 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) {
                        kvmppc_set_dar(vcpu, 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:
        case BOOK3S_INTERRUPT_DOORBELL:
        case BOOK3S_INTERRUPT_H_DOORBELL:
                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:
                r = kvmppc_exit_pr_progint(run, vcpu, exit_nr);
                break;
        case BOOK3S_INTERRUPT_SYSCALL:
        {
                u32 last_sc;
                int emul;

                /* Get last sc for papr */
                if (vcpu->arch.papr_enabled) {
                        /* The sc instuction points SRR0 to the next inst */
                        emul = kvmppc_get_last_inst(vcpu, INST_SC, &last_sc);
                        if (emul != EMULATE_DONE) {
                                kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) - 4);
                                r = RESUME_GUEST;
                                break;
                        }
                }

                if (vcpu->arch.papr_enabled &&
                    (last_sc == 0x44000022) &&
                    !(kvmppc_get_msr(vcpu) & MSR_PR)) {
                        /* SC 1 papr hypercalls */
                        ulong cmd = kvmppc_get_gpr(vcpu, 3);
                        int i;

#ifdef CONFIG_PPC_BOOK3S_64
                        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 (!(kvmppc_get_msr(vcpu) & 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;
                int emul;
                u32 last_inst;

                if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE) {
                        /* Do paired single instruction emulation */
                        emul = kvmppc_get_last_inst(vcpu, INST_GENERIC,
                                                    &last_inst);
                        if (emul == EMULATE_DONE)
                                r = kvmppc_exit_pr_progint(run, vcpu, exit_nr);
                        else
                                r = RESUME_GUEST;

                        break;
                }

                /* Enable external provider */
                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;
                }

                r = kvmppc_handle_ext(vcpu, exit_nr, ext_msr);
                break;
        }
        case BOOK3S_INTERRUPT_ALIGNMENT:
        {
                u32 last_inst;
                int emul = kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst);

                if (emul == EMULATE_DONE) {
                        u32 dsisr;
                        u64 dar;

                        dsisr = kvmppc_alignment_dsisr(vcpu, last_inst);
                        dar = kvmppc_alignment_dar(vcpu, last_inst);

                        kvmppc_set_dsisr(vcpu, dsisr);
                        kvmppc_set_dar(vcpu, dar);

                        kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
                }
                r = RESUME_GUEST;
                break;
        }
#ifdef CONFIG_PPC_BOOK3S_64
        case BOOK3S_INTERRUPT_FAC_UNAVAIL:
                kvmppc_handle_fac(vcpu, vcpu->arch.shadow_fscr >> 56);
                r = RESUME_GUEST;
                break;
#endif
        case BOOK3S_INTERRUPT_MACHINE_CHECK:
                kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
                r = RESUME_GUEST;
                break;
        case BOOK3S_INTERRUPT_TRACE:
                if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {
                        run->exit_reason = KVM_EXIT_DEBUG;
                        r = RESUME_HOST;
                } else {
                        kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
                        r = RESUME_GUEST;
                }
                break;
        default:
        {
                ulong shadow_srr1 = vcpu->arch.shadow_srr1;
                /* 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.
                 */
                s = kvmppc_prepare_to_enter(vcpu);
                if (s <= 0)
                        r = s;
                else {
                        /* interrupts now hard-disabled */
                        kvmppc_fix_ee_before_entry();
                }

                kvmppc_handle_lost_ext(vcpu);
        }

        trace_kvm_book3s_reenter(r, vcpu);

        return r;
}

static int kvm_arch_vcpu_ioctl_get_sregs_pr(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] = kvmppc_get_sr(vcpu, 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;
}

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

        kvmppc_set_pvr_pr(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;
}

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

        switch (id) {
        case KVM_REG_PPC_DEBUG_INST:
                *val = get_reg_val(id, KVMPPC_INST_SW_BREAKPOINT);
                break;
        case KVM_REG_PPC_HIOR:
                *val = get_reg_val(id, to_book3s(vcpu)->hior);
                break;
        case KVM_REG_PPC_VTB:
                *val = get_reg_val(id, to_book3s(vcpu)->vtb);
                break;
        case KVM_REG_PPC_LPCR:
        case KVM_REG_PPC_LPCR_64:
                /*
                 * We are only interested in the LPCR_ILE bit
                 */
                if (vcpu->arch.intr_msr & MSR_LE)
                        *val = get_reg_val(id, LPCR_ILE);
                else
                        *val = get_reg_val(id, 0);
                break;
        default:
                r = -EINVAL;
                break;
        }

        return r;
}

static void kvmppc_set_lpcr_pr(struct kvm_vcpu *vcpu, u64 new_lpcr)
{
        if (new_lpcr & LPCR_ILE)
                vcpu->arch.intr_msr |= MSR_LE;
        else
                vcpu->arch.intr_msr &= ~MSR_LE;
}

static int kvmppc_set_one_reg_pr(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;
        case KVM_REG_PPC_VTB:
                to_book3s(vcpu)->vtb = set_reg_val(id, *val);
                break;
        case KVM_REG_PPC_LPCR:
        case KVM_REG_PPC_LPCR_64:
                kvmppc_set_lpcr_pr(vcpu, set_reg_val(id, *val));
                break;
        default:
                r = -EINVAL;
                break;
        }

        return r;
}

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

        vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
        if (!vcpu)
                goto out;

        vcpu_book3s = vzalloc(sizeof(struct kvmppc_vcpu_book3s));
        if (!vcpu_book3s)
                goto free_vcpu;
        vcpu->arch.book3s = vcpu_book3s;

#ifdef CONFIG_KVM_BOOK3S_32_HANDLER
        vcpu->arch.shadow_vcpu =
                kzalloc(sizeof(*vcpu->arch.shadow_vcpu), GFP_KERNEL);
        if (!vcpu->arch.shadow_vcpu)
                goto free_vcpu3s;
#endif

        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;
        vcpu->arch.shared = (void *)p;
#ifdef CONFIG_PPC_BOOK3S_64
        /* Always start the shared struct in native endian mode */
#ifdef __BIG_ENDIAN__
        vcpu->arch.shared_big_endian = true;
#else
        vcpu->arch.shared_big_endian = false;
#endif

        /*
         * Default to the same as the host if we're on sufficiently
         * recent machine that we have 1TB segments;
         * otherwise default to PPC970FX.
         */
        vcpu->arch.pvr = 0x3C0301;
        if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
                vcpu->arch.pvr = mfspr(SPRN_PVR);
        vcpu->arch.intr_msr = MSR_SF;
#else
        /* default to book3s_32 (750) */
        vcpu->arch.pvr = 0x84202;
#endif
        kvmppc_set_pvr_pr(vcpu, vcpu->arch.pvr);
        vcpu->arch.slb_nr = 64;

        vcpu->arch.shadow_msr = MSR_USER64 & ~MSR_LE;

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

        return vcpu;

uninit_vcpu:
        kvm_vcpu_uninit(vcpu);
free_shadow_vcpu:
#ifdef CONFIG_KVM_BOOK3S_32_HANDLER
        kfree(vcpu->arch.shadow_vcpu);
free_vcpu3s:
#endif
        vfree(vcpu_book3s);
free_vcpu:
        kmem_cache_free(kvm_vcpu_cache, vcpu);
out:
        return ERR_PTR(err);
}

static void kvmppc_core_vcpu_free_pr(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);
#ifdef CONFIG_KVM_BOOK3S_32_HANDLER
        kfree(vcpu->arch.shadow_vcpu);
#endif
        vfree(vcpu_book3s);
        kmem_cache_free(kvm_vcpu_cache, vcpu);
}

static int kvmppc_vcpu_run_pr(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
{
        int ret;
#ifdef CONFIG_ALTIVEC
        unsigned long uninitialized_var(vrsave);
#endif

        /* 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;
        }

        kvmppc_setup_debug(vcpu);

        /*
         * 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.
         */
        ret = kvmppc_prepare_to_enter(vcpu);
        if (ret <= 0)
                goto out;
        /* interrupts now hard-disabled */

        /* Save FPU, Altivec and VSX state */
        giveup_all(current);

        /* Preload FPU if it's enabled */
        if (kvmppc_get_msr(vcpu) & MSR_FP)
                kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);

        kvmppc_fix_ee_before_entry();

        ret = __kvmppc_vcpu_run(kvm_run, vcpu);

        kvmppc_clear_debug(vcpu);

        /* No need for 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);

        /* Make sure we save the guest TAR/EBB/DSCR state */
        kvmppc_giveup_fac(vcpu, FSCR_TAR_LG);

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

/*
 * Get (and clear) the dirty memory log for a memory slot.
 */
static int kvm_vm_ioctl_get_dirty_log_pr(struct kvm *kvm,
                                         struct kvm_dirty_log *log)
{
        struct kvm_memslots *slots;
        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) {
                slots = kvm_memslots(kvm);
                memslot = id_to_memslot(slots, 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;
}

static void kvmppc_core_flush_memslot_pr(struct kvm *kvm,
                                         struct kvm_memory_slot *memslot)
{
        return;
}

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

static void kvmppc_core_commit_memory_region_pr(struct kvm *kvm,
                                const struct kvm_userspace_memory_region *mem,
                                const struct kvm_memory_slot *old,
                                const struct kvm_memory_slot *new)
{
        return;
}

static void kvmppc_core_free_memslot_pr(struct kvm_memory_slot *free,
                                        struct kvm_memory_slot *dont)
{
        return;
}

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


#ifdef CONFIG_PPC64
static int kvm_vm_ioctl_get_smmu_info_pr(struct kvm *kvm,
                                         struct kvm_ppc_smmu_info *info)
{
        long int i;
        struct kvm_vcpu *vcpu;

        info->flags = 0;

        /* 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;

        /*
         * 64k large page size.
         * We only want to put this in if the CPUs we're emulating
         * support it, but unfortunately we don't have a vcpu easily
         * to hand here to test.  Just pick the first vcpu, and if
         * that doesn't exist yet, report the minimum capability,
         * i.e., no 64k pages.
         * 1T segment support goes along with 64k pages.
         */
        i = 1;
        vcpu = kvm_get_vcpu(kvm, 0);
        if (vcpu && (vcpu->arch.hflags & BOOK3S_HFLAG_MULTI_PGSIZE)) {
                info->flags = KVM_PPC_1T_SEGMENTS;
                info->sps[i].page_shift = 16;
                info->sps[i].slb_enc = SLB_VSID_L | SLB_VSID_LP_01;
                info->sps[i].enc[0].page_shift = 16;
                info->sps[i].enc[0].pte_enc = 1;
                ++i;
        }

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

        return 0;
}
#else
static int kvm_vm_ioctl_get_smmu_info_pr(struct kvm *kvm,
                                         struct kvm_ppc_smmu_info *info)
{
        /* We should not get called */
        BUG();
}
#endif /* CONFIG_PPC64 */

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

static int kvmppc_core_init_vm_pr(struct kvm *kvm)
{
        mutex_init(&kvm->arch.hpt_mutex);

#ifdef CONFIG_PPC_BOOK3S_64
        /* Start out with the default set of hcalls enabled */
        kvmppc_pr_init_default_hcalls(kvm);
#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;
}

static void kvmppc_core_destroy_vm_pr(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_core_check_processor_compat_pr(void)
{
        /*
         * Disable KVM for Power9 untill the required bits merged.
         */
        if (cpu_has_feature(CPU_FTR_ARCH_300))
                return -EIO;
        return 0;
}

static long kvm_arch_vm_ioctl_pr(struct file *filp,
                                 unsigned int ioctl, unsigned long arg)
{
        return -ENOTTY;
}

static struct kvmppc_ops kvm_ops_pr = {
        .get_sregs = kvm_arch_vcpu_ioctl_get_sregs_pr,
        .set_sregs = kvm_arch_vcpu_ioctl_set_sregs_pr,
        .get_one_reg = kvmppc_get_one_reg_pr,
        .set_one_reg = kvmppc_set_one_reg_pr,
        .vcpu_load   = kvmppc_core_vcpu_load_pr,
        .vcpu_put    = kvmppc_core_vcpu_put_pr,
        .set_msr     = kvmppc_set_msr_pr,
        .vcpu_run    = kvmppc_vcpu_run_pr,
        .vcpu_create = kvmppc_core_vcpu_create_pr,
        .vcpu_free   = kvmppc_core_vcpu_free_pr,
        .check_requests = kvmppc_core_check_requests_pr,
        .get_dirty_log = kvm_vm_ioctl_get_dirty_log_pr,
        .flush_memslot = kvmppc_core_flush_memslot_pr,
        .prepare_memory_region = kvmppc_core_prepare_memory_region_pr,
        .commit_memory_region = kvmppc_core_commit_memory_region_pr,
        .unmap_hva = kvm_unmap_hva_pr,
        .unmap_hva_range = kvm_unmap_hva_range_pr,
        .age_hva  = kvm_age_hva_pr,
        .test_age_hva = kvm_test_age_hva_pr,
        .set_spte_hva = kvm_set_spte_hva_pr,
        .mmu_destroy  = kvmppc_mmu_destroy_pr,
        .free_memslot = kvmppc_core_free_memslot_pr,
        .create_memslot = kvmppc_core_create_memslot_pr,
        .init_vm = kvmppc_core_init_vm_pr,
        .destroy_vm = kvmppc_core_destroy_vm_pr,
        .get_smmu_info = kvm_vm_ioctl_get_smmu_info_pr,
        .emulate_op = kvmppc_core_emulate_op_pr,
        .emulate_mtspr = kvmppc_core_emulate_mtspr_pr,
        .emulate_mfspr = kvmppc_core_emulate_mfspr_pr,
        .fast_vcpu_kick = kvm_vcpu_kick,
        .arch_vm_ioctl  = kvm_arch_vm_ioctl_pr,
#ifdef CONFIG_PPC_BOOK3S_64
        .hcall_implemented = kvmppc_hcall_impl_pr,
#endif
};


int kvmppc_book3s_init_pr(void)
{
        int r;

        r = kvmppc_core_check_processor_compat_pr();
        if (r < 0)
                return r;

        kvm_ops_pr.owner = THIS_MODULE;
        kvmppc_pr_ops = &kvm_ops_pr;

        r = kvmppc_mmu_hpte_sysinit();
        return r;
}

void kvmppc_book3s_exit_pr(void)
{
        kvmppc_pr_ops = NULL;
        kvmppc_mmu_hpte_sysexit();
}

/*
 * We only support separate modules for book3s 64
 */
#ifdef CONFIG_PPC_BOOK3S_64

module_init(kvmppc_book3s_init_pr);
module_exit(kvmppc_book3s_exit_pr);

MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(KVM_MINOR);
MODULE_ALIAS("devname:kvm");
#endif