text: /*
   * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
   * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved.
   *
   * Authors:
   *    Paul Mackerras <paulus@au1.ibm.com>
   *    Alexander Graf <agraf@suse.de>
   *    Kevin Wolf <mail@kevin-wolf.de>
   *
   * Description: KVM functions specific to running on Book 3S
   * processors in hypervisor mode (specifically POWER7 and later).
   *
   * This file is derived from arch/powerpc/kvm/book3s.c,
   * by Alexander Graf <agraf@suse.de>.
   *
   * 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/err.h>
  #include <linux/slab.h>
  #include <linux/preempt.h>
  #include <linux/sched.h>
  #include <linux/delay.h>
  #include <linux/export.h>
  #include <linux/fs.h>
  #include <linux/anon_inodes.h>
  #include <linux/cpumask.h>
  #include <linux/spinlock.h>
  #include <linux/page-flags.h>
  #include <linux/srcu.h>
  #include <linux/miscdevice.h>
  
  #include <asm/reg.h>
  #include <asm/cputable.h>
  #include <asm/cache.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/lppaca.h>
  #include <asm/processor.h>
  #include <asm/cputhreads.h>
  #include <asm/page.h>
  #include <asm/hvcall.h>
  #include <asm/switch_to.h>
  #include <asm/smp.h>
  #include <linux/gfp.h>
  #include <linux/vmalloc.h>
  #include <linux/highmem.h>
  #include <linux/hugetlb.h>
  #include <linux/module.h>
  
  #include "book3s.h"
  
  /* #define EXIT_DEBUG */
  /* #define EXIT_DEBUG_SIMPLE */
  /* #define EXIT_DEBUG_INT */
  
  /* Used to indicate that a guest page fault needs to be handled */
  #define RESUME_PAGE_FAULT	(RESUME_GUEST | RESUME_FLAG_ARCH1)
  
  /* Used as a "null" value for timebase values */
  #define TB_NIL	(~(u64)0)
  
  static DECLARE_BITMAP(default_enabled_hcalls, MAX_HCALL_OPCODE/4 + 1);
  
  #if defined(CONFIG_PPC_64K_PAGES)
  #define MPP_BUFFER_ORDER	0
  #elif defined(CONFIG_PPC_4K_PAGES)
  #define MPP_BUFFER_ORDER	3
  #endif
  
  
  static void kvmppc_end_cede(struct kvm_vcpu *vcpu);
  static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu);
  
  static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
  {
  	int me;
  	int cpu = vcpu->cpu;
  	wait_queue_head_t *wqp;
  
  	wqp = kvm_arch_vcpu_wq(vcpu);
  	if (waitqueue_active(wqp)) {
  		wake_up_interruptible(wqp);
  		++vcpu->stat.halt_wakeup;
  	}
  
  	me = get_cpu();
  
  	/* CPU points to the first thread of the core */
  	if (cpu != me && cpu >= 0 && cpu < nr_cpu_ids) {
  #ifdef CONFIG_PPC_ICP_NATIVE
  		int real_cpu = cpu + vcpu->arch.ptid;
  		if (paca[real_cpu].kvm_hstate.xics_phys)
  			xics_wake_cpu(real_cpu);
  		else
  #endif
  		if (cpu_online(cpu))
  			smp_send_reschedule(cpu);
  	}
  	put_cpu();
  }
  
  /*
   * We use the vcpu_load/put functions to measure stolen time.
   * Stolen time is counted as time when either the vcpu is able to
   * run as part of a virtual core, but the task running the vcore
   * is preempted or sleeping, or when the vcpu needs something done
   * in the kernel by the task running the vcpu, but that task is
   * preempted or sleeping.  Those two things have to be counted
   * separately, since one of the vcpu tasks will take on the job
   * of running the core, and the other vcpu tasks in the vcore will
   * sleep waiting for it to do that, but that sleep shouldn't count
   * as stolen time.
   *
   * Hence we accumulate stolen time when the vcpu can run as part of
   * a vcore using vc->stolen_tb, and the stolen time when the vcpu
   * needs its task to do other things in the kernel (for example,
   * service a page fault) in busy_stolen.  We don't accumulate
   * stolen time for a vcore when it is inactive, or for a vcpu
   * when it is in state RUNNING or NOTREADY.  NOTREADY is a bit of
   * a misnomer; it means that the vcpu task is not executing in
   * the KVM_VCPU_RUN ioctl, i.e. it is in userspace or elsewhere in
   * the kernel.  We don't have any way of dividing up that time
   * between time that the vcpu is genuinely stopped, time that
   * the task is actively working on behalf of the vcpu, and time
   * that the task is preempted, so we don't count any of it as
   * stolen.
   *
   * Updates to busy_stolen are protected by arch.tbacct_lock;
   * updates to vc->stolen_tb are protected by the arch.tbacct_lock
   * of the vcpu that has taken responsibility for running the vcore
   * (i.e. vc->runner).  The stolen times are measured in units of
   * timebase ticks.  (Note that the != TB_NIL checks below are
   * purely defensive; they should never fail.)
   */
  
  static void kvmppc_core_vcpu_load_hv(struct kvm_vcpu *vcpu, int cpu)
  {
  	struct kvmppc_vcore *vc = vcpu->arch.vcore;
  	unsigned long flags;
  
  	spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
  	if (vc->runner == vcpu && vc->vcore_state != VCORE_INACTIVE &&
  	    vc->preempt_tb != TB_NIL) {
  		vc->stolen_tb += mftb() - vc->preempt_tb;
  		vc->preempt_tb = TB_NIL;
  	}
  	if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST &&
  	    vcpu->arch.busy_preempt != TB_NIL) {
  		vcpu->arch.busy_stolen += mftb() - vcpu->arch.busy_preempt;
  		vcpu->arch.busy_preempt = TB_NIL;
  	}
  	spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
  }
  
  static void kvmppc_core_vcpu_put_hv(struct kvm_vcpu *vcpu)
  {
  	struct kvmppc_vcore *vc = vcpu->arch.vcore;
  	unsigned long flags;
  
  	spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
  	if (vc->runner == vcpu && vc->vcore_state != VCORE_INACTIVE)
  		vc->preempt_tb = mftb();
  	if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST)
  		vcpu->arch.busy_preempt = mftb();
  	spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
  }
  
  static void kvmppc_set_msr_hv(struct kvm_vcpu *vcpu, u64 msr)
  {
  	vcpu->arch.shregs.msr = msr;
  	kvmppc_end_cede(vcpu);
  }
  
  void kvmppc_set_pvr_hv(struct kvm_vcpu *vcpu, u32 pvr)
  {
  	vcpu->arch.pvr = pvr;
  }
  
  int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat)
  {
  	unsigned long pcr = 0;
  	struct kvmppc_vcore *vc = vcpu->arch.vcore;
  
  	if (arch_compat) {
  		if (!cpu_has_feature(CPU_FTR_ARCH_206))
  			return -EINVAL;	/* 970 has no compat mode support */
  
  		switch (arch_compat) {
  		case PVR_ARCH_205:
  			/*
  			 * If an arch bit is set in PCR, all the defined
  			 * higher-order arch bits also have to be set.
  			 */
  			pcr = PCR_ARCH_206 | PCR_ARCH_205;
  			break;
  		case PVR_ARCH_206:
  		case PVR_ARCH_206p:
  			pcr = PCR_ARCH_206;
  			break;
  		case PVR_ARCH_207:
  			break;
  		default:
  			return -EINVAL;
  		}
  
  		if (!cpu_has_feature(CPU_FTR_ARCH_207S)) {
  			/* POWER7 can't emulate POWER8 */
  			if (!(pcr & PCR_ARCH_206))
  				return -EINVAL;
  			pcr &= ~PCR_ARCH_206;
  		}
  	}
  
  	spin_lock(&vc->lock);
  	vc->arch_compat = arch_compat;
  	vc->pcr = pcr;
  	spin_unlock(&vc->lock);
  
  	return 0;
  }
  
  void kvmppc_dump_regs(struct kvm_vcpu *vcpu)
  {
  	int r;
  
  	pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id);
  	pr_err("pc  = %.16lx  msr = %.16llx  trap = %x\n",
  	       vcpu->arch.pc, vcpu->arch.shregs.msr, vcpu->arch.trap);
  	for (r = 0; r < 16; ++r)
  		pr_err("r%2d = %.16lx  r%d = %.16lx\n",
  		       r, kvmppc_get_gpr(vcpu, r),
  		       r+16, kvmppc_get_gpr(vcpu, r+16));
  	pr_err("ctr = %.16lx  lr  = %.16lx\n",
  	       vcpu->arch.ctr, vcpu->arch.lr);
  	pr_err("srr0 = %.16llx srr1 = %.16llx\n",
  	       vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1);
  	pr_err("sprg0 = %.16llx sprg1 = %.16llx\n",
  	       vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1);
  	pr_err("sprg2 = %.16llx sprg3 = %.16llx\n",
  	       vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3);
  	pr_err("cr = %.8x  xer = %.16lx  dsisr = %.8x\n",
  	       vcpu->arch.cr, vcpu->arch.xer, vcpu->arch.shregs.dsisr);
  	pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar);
  	pr_err("fault dar = %.16lx dsisr = %.8x\n",
  	       vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
  	pr_err("SLB (%d entries):\n", vcpu->arch.slb_max);
  	for (r = 0; r < vcpu->arch.slb_max; ++r)
  		pr_err("  ESID = %.16llx VSID = %.16llx\n",
  		       vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv);
  	pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.8x\n",
  	       vcpu->arch.vcore->lpcr, vcpu->kvm->arch.sdr1,
  	       vcpu->arch.last_inst);
  }
  
  struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id)
  {
  	int r;
  	struct kvm_vcpu *v, *ret = NULL;
  
  	mutex_lock(&kvm->lock);
  	kvm_for_each_vcpu(r, v, kvm) {
  		if (v->vcpu_id == id) {
  			ret = v;
  			break;
  		}
  	}
  	mutex_unlock(&kvm->lock);
  	return ret;
  }
  
  static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa)
  {
  	vpa->__old_status |= LPPACA_OLD_SHARED_PROC;
  	vpa->yield_count = cpu_to_be32(1);
  }
  
  static int set_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *v,
  		   unsigned long addr, unsigned long len)
  {
  	/* check address is cacheline aligned */
  	if (addr & (L1_CACHE_BYTES - 1))
  		return -EINVAL;
  	spin_lock(&vcpu->arch.vpa_update_lock);
  	if (v->next_gpa != addr || v->len != len) {
  		v->next_gpa = addr;
  		v->len = addr ? len : 0;
  		v->update_pending = 1;
  	}
  	spin_unlock(&vcpu->arch.vpa_update_lock);
  	return 0;
  }
  
  /* Length for a per-processor buffer is passed in at offset 4 in the buffer */
  struct reg_vpa {
  	u32 dummy;
  	union {
  		__be16 hword;
  		__be32 word;
  	} length;
  };
  
  static int vpa_is_registered(struct kvmppc_vpa *vpap)
  {
  	if (vpap->update_pending)
  		return vpap->next_gpa != 0;
  	return vpap->pinned_addr != NULL;
  }
  
  static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
  				       unsigned long flags,
  				       unsigned long vcpuid, unsigned long vpa)
  {
  	struct kvm *kvm = vcpu->kvm;
  	unsigned long len, nb;
  	void *va;
  	struct kvm_vcpu *tvcpu;
  	int err;
  	int subfunc;
  	struct kvmppc_vpa *vpap;
  
  	tvcpu = kvmppc_find_vcpu(kvm, vcpuid);
  	if (!tvcpu)
  		return H_PARAMETER;
  
  	subfunc = (flags >> H_VPA_FUNC_SHIFT) & H_VPA_FUNC_MASK;
  	if (subfunc == H_VPA_REG_VPA || subfunc == H_VPA_REG_DTL ||
  	    subfunc == H_VPA_REG_SLB) {
  		/* Registering new area - address must be cache-line aligned */
  		if ((vpa & (L1_CACHE_BYTES - 1)) || !vpa)
  			return H_PARAMETER;
  
  		/* convert logical addr to kernel addr and read length */
  		va = kvmppc_pin_guest_page(kvm, vpa, &nb);
  		if (va == NULL)
  			return H_PARAMETER;
  		if (subfunc == H_VPA_REG_VPA)
  			len = be16_to_cpu(((struct reg_vpa *)va)->length.hword);
  		else
  			len = be32_to_cpu(((struct reg_vpa *)va)->length.word);
  		kvmppc_unpin_guest_page(kvm, va, vpa, false);
  
  		/* Check length */
  		if (len > nb || len < sizeof(struct reg_vpa))
  			return H_PARAMETER;
  	} else {
  		vpa = 0;
  		len = 0;
  	}
  
  	err = H_PARAMETER;
  	vpap = NULL;
  	spin_lock(&tvcpu->arch.vpa_update_lock);
  
  	switch (subfunc) {
  	case H_VPA_REG_VPA:		/* register VPA */
  		if (len < sizeof(struct lppaca))
  			break;
  		vpap = &tvcpu->arch.vpa;
  		err = 0;
  		break;
  
  	case H_VPA_REG_DTL:		/* register DTL */
  		if (len < sizeof(struct dtl_entry))
  			break;
  		len -= len % sizeof(struct dtl_entry);
  
  		/* Check that they have previously registered a VPA */
  		err = H_RESOURCE;
  		if (!vpa_is_registered(&tvcpu->arch.vpa))
  			break;
  
  		vpap = &tvcpu->arch.dtl;
  		err = 0;
  		break;
  
  	case H_VPA_REG_SLB:		/* register SLB shadow buffer */
  		/* Check that they have previously registered a VPA */
  		err = H_RESOURCE;
  		if (!vpa_is_registered(&tvcpu->arch.vpa))
  			break;
  
  		vpap = &tvcpu->arch.slb_shadow;
  		err = 0;
  		break;
  
  	case H_VPA_DEREG_VPA:		/* deregister VPA */
  		/* Check they don't still have a DTL or SLB buf registered */
  		err = H_RESOURCE;
  		if (vpa_is_registered(&tvcpu->arch.dtl) ||
  		    vpa_is_registered(&tvcpu->arch.slb_shadow))
  			break;
  
  		vpap = &tvcpu->arch.vpa;
  		err = 0;
  		break;
  
  	case H_VPA_DEREG_DTL:		/* deregister DTL */
  		vpap = &tvcpu->arch.dtl;
  		err = 0;
  		break;
  
  	case H_VPA_DEREG_SLB:		/* deregister SLB shadow buffer */
  		vpap = &tvcpu->arch.slb_shadow;
  		err = 0;
  		break;
  	}
  
  	if (vpap) {
  		vpap->next_gpa = vpa;
  		vpap->len = len;
  		vpap->update_pending = 1;
  	}
  
  	spin_unlock(&tvcpu->arch.vpa_update_lock);
  
  	return err;
  }
  
  static void kvmppc_update_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *vpap)
  {
  	struct kvm *kvm = vcpu->kvm;
  	void *va;
  	unsigned long nb;
  	unsigned long gpa;
  
  	/*
  	 * We need to pin the page pointed to by vpap->next_gpa,
  	 * but we can't call kvmppc_pin_guest_page under the lock
  	 * as it does get_user_pages() and down_read().  So we
  	 * have to drop the lock, pin the page, then get the lock
  	 * again and check that a new area didn't get registered
  	 * in the meantime.
  	 */
  	for (;;) {
  		gpa = vpap->next_gpa;
  		spin_unlock(&vcpu->arch.vpa_update_lock);
  		va = NULL;
  		nb = 0;
  		if (gpa)
  			va = kvmppc_pin_guest_page(kvm, gpa, &nb);
  		spin_lock(&vcpu->arch.vpa_update_lock);
  		if (gpa == vpap->next_gpa)
  			break;
  		/* sigh... unpin that one and try again */
  		if (va)
  			kvmppc_unpin_guest_page(kvm, va, gpa, false);
  	}
  
  	vpap->update_pending = 0;
  	if (va && nb < vpap->len) {
  		/*
  		 * If it's now too short, it must be that userspace
  		 * has changed the mappings underlying guest memory,
  		 * so unregister the region.
  		 */
  		kvmppc_unpin_guest_page(kvm, va, gpa, false);
  		va = NULL;
  	}
  	if (vpap->pinned_addr)
  		kvmppc_unpin_guest_page(kvm, vpap->pinned_addr, vpap->gpa,
  					vpap->dirty);
  	vpap->gpa = gpa;
  	vpap->pinned_addr = va;
  	vpap->dirty = false;
  	if (va)
  		vpap->pinned_end = va + vpap->len;
  }
  
  static void kvmppc_update_vpas(struct kvm_vcpu *vcpu)
  {
  	if (!(vcpu->arch.vpa.update_pending ||
  	      vcpu->arch.slb_shadow.update_pending ||
  	      vcpu->arch.dtl.update_pending))
  		return;
  
  	spin_lock(&vcpu->arch.vpa_update_lock);
  	if (vcpu->arch.vpa.update_pending) {
  		kvmppc_update_vpa(vcpu, &vcpu->arch.vpa);
  		if (vcpu->arch.vpa.pinned_addr)
  			init_vpa(vcpu, vcpu->arch.vpa.pinned_addr);
  	}
  	if (vcpu->arch.dtl.update_pending) {
  		kvmppc_update_vpa(vcpu, &vcpu->arch.dtl);
  		vcpu->arch.dtl_ptr = vcpu->arch.dtl.pinned_addr;
  		vcpu->arch.dtl_index = 0;
  	}
  	if (vcpu->arch.slb_shadow.update_pending)
  		kvmppc_update_vpa(vcpu, &vcpu->arch.slb_shadow);
  	spin_unlock(&vcpu->arch.vpa_update_lock);
  }
  
  /*
   * Return the accumulated stolen time for the vcore up until `now'.
   * The caller should hold the vcore lock.
   */
  static u64 vcore_stolen_time(struct kvmppc_vcore *vc, u64 now)
  {
  	u64 p;
  
  	/*
  	 * If we are the task running the vcore, then since we hold
  	 * the vcore lock, we can't be preempted, so stolen_tb/preempt_tb
  	 * can't be updated, so we don't need the tbacct_lock.
  	 * If the vcore is inactive, it can't become active (since we
  	 * hold the vcore lock), so the vcpu load/put functions won't
  	 * update stolen_tb/preempt_tb, and we don't need tbacct_lock.
  	 */
  	if (vc->vcore_state != VCORE_INACTIVE &&
  	    vc->runner->arch.run_task != current) {
  		spin_lock_irq(&vc->runner->arch.tbacct_lock);
  		p = vc->stolen_tb;
  		if (vc->preempt_tb != TB_NIL)
  			p += now - vc->preempt_tb;
  		spin_unlock_irq(&vc->runner->arch.tbacct_lock);
  	} else {
  		p = vc->stolen_tb;
  	}
  	return p;
  }
  
  static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu,
  				    struct kvmppc_vcore *vc)
  {
  	struct dtl_entry *dt;
  	struct lppaca *vpa;
  	unsigned long stolen;
  	unsigned long core_stolen;
  	u64 now;
  
  	dt = vcpu->arch.dtl_ptr;
  	vpa = vcpu->arch.vpa.pinned_addr;
  	now = mftb();
  	core_stolen = vcore_stolen_time(vc, now);
  	stolen = core_stolen - vcpu->arch.stolen_logged;
  	vcpu->arch.stolen_logged = core_stolen;
  	spin_lock_irq(&vcpu->arch.tbacct_lock);
  	stolen += vcpu->arch.busy_stolen;
  	vcpu->arch.busy_stolen = 0;
  	spin_unlock_irq(&vcpu->arch.tbacct_lock);
  	if (!dt || !vpa)
  		return;
  	memset(dt, 0, sizeof(struct dtl_entry));
  	dt->dispatch_reason = 7;
  	dt->processor_id = cpu_to_be16(vc->pcpu + vcpu->arch.ptid);
  	dt->timebase = cpu_to_be64(now + vc->tb_offset);
  	dt->enqueue_to_dispatch_time = cpu_to_be32(stolen);
  	dt->srr0 = cpu_to_be64(kvmppc_get_pc(vcpu));
  	dt->srr1 = cpu_to_be64(vcpu->arch.shregs.msr);
  	++dt;
  	if (dt == vcpu->arch.dtl.pinned_end)
  		dt = vcpu->arch.dtl.pinned_addr;
  	vcpu->arch.dtl_ptr = dt;
  	/* order writing *dt vs. writing vpa->dtl_idx */
  	smp_wmb();
  	vpa->dtl_idx = cpu_to_be64(++vcpu->arch.dtl_index);
  	vcpu->arch.dtl.dirty = true;
  }
  
  static bool kvmppc_power8_compatible(struct kvm_vcpu *vcpu)
  {
  	if (vcpu->arch.vcore->arch_compat >= PVR_ARCH_207)
  		return true;
  	if ((!vcpu->arch.vcore->arch_compat) &&
  	    cpu_has_feature(CPU_FTR_ARCH_207S))
  		return true;
  	return false;
  }
  
  static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags,
  			     unsigned long resource, unsigned long value1,
  			     unsigned long value2)
  {
  	switch (resource) {
  	case H_SET_MODE_RESOURCE_SET_CIABR:
  		if (!kvmppc_power8_compatible(vcpu))
  			return H_P2;
  		if (value2)
  			return H_P4;
  		if (mflags)
  			return H_UNSUPPORTED_FLAG_START;
  		/* Guests can't breakpoint the hypervisor */
  		if ((value1 & CIABR_PRIV) == CIABR_PRIV_HYPER)
  			return H_P3;
  		vcpu->arch.ciabr  = value1;
  		return H_SUCCESS;
  	case H_SET_MODE_RESOURCE_SET_DAWR:
  		if (!kvmppc_power8_compatible(vcpu))
  			return H_P2;
  		if (mflags)
  			return H_UNSUPPORTED_FLAG_START;
  		if (value2 & DABRX_HYP)
  			return H_P4;
  		vcpu->arch.dawr  = value1;
  		vcpu->arch.dawrx = value2;
  		return H_SUCCESS;
  	default:
  		return H_TOO_HARD;
  	}
  }
  
  int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
  {
  	unsigned long req = kvmppc_get_gpr(vcpu, 3);
  	unsigned long target, ret = H_SUCCESS;
  	struct kvm_vcpu *tvcpu;
  	int idx, rc;
  
  	if (req <= MAX_HCALL_OPCODE &&
  	    !test_bit(req/4, vcpu->kvm->arch.enabled_hcalls))
  		return RESUME_HOST;
  
  	switch (req) {
  	case H_ENTER:
  		idx = srcu_read_lock(&vcpu->kvm->srcu);
  		ret = kvmppc_virtmode_h_enter(vcpu, kvmppc_get_gpr(vcpu, 4),
  					      kvmppc_get_gpr(vcpu, 5),
  					      kvmppc_get_gpr(vcpu, 6),
  					      kvmppc_get_gpr(vcpu, 7));
  		srcu_read_unlock(&vcpu->kvm->srcu, idx);
  		break;
  	case H_CEDE:
  		break;
  	case H_PROD:
  		target = kvmppc_get_gpr(vcpu, 4);
  		tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
  		if (!tvcpu) {
  			ret = H_PARAMETER;
  			break;
  		}
  		tvcpu->arch.prodded = 1;
  		smp_mb();
  		if (vcpu->arch.ceded) {
  			if (waitqueue_active(&vcpu->wq)) {
  				wake_up_interruptible(&vcpu->wq);
  				vcpu->stat.halt_wakeup++;
  			}
  		}
  		break;
  	case H_CONFER:
  		target = kvmppc_get_gpr(vcpu, 4);
  		if (target == -1)
  			break;
  		tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
  		if (!tvcpu) {
  			ret = H_PARAMETER;
  			break;
  		}
  		kvm_vcpu_yield_to(tvcpu);
  		break;
  	case H_REGISTER_VPA:
  		ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4),
  					kvmppc_get_gpr(vcpu, 5),
  					kvmppc_get_gpr(vcpu, 6));
  		break;
  	case H_RTAS:
  		if (list_empty(&vcpu->kvm->arch.rtas_tokens))
  			return RESUME_HOST;
  
  		idx = srcu_read_lock(&vcpu->kvm->srcu);
  		rc = kvmppc_rtas_hcall(vcpu);
  		srcu_read_unlock(&vcpu->kvm->srcu, idx);
  
  		if (rc == -ENOENT)
  			return RESUME_HOST;
  		else if (rc == 0)
  			break;
  
  		/* Send the error out to userspace via KVM_RUN */
  		return rc;
  	case H_SET_MODE:
  		ret = kvmppc_h_set_mode(vcpu, kvmppc_get_gpr(vcpu, 4),
  					kvmppc_get_gpr(vcpu, 5),
  					kvmppc_get_gpr(vcpu, 6),
  					kvmppc_get_gpr(vcpu, 7));
  		if (ret == H_TOO_HARD)
  			return RESUME_HOST;
  		break;
  	case H_XIRR:
  	case H_CPPR:
  	case H_EOI:
  	case H_IPI:
  	case H_IPOLL:
  	case H_XIRR_X:
  		if (kvmppc_xics_enabled(vcpu)) {
  			ret = kvmppc_xics_hcall(vcpu, req);
  			break;
  		} /* fallthrough */
  	default:
  		return RESUME_HOST;
  	}
  	kvmppc_set_gpr(vcpu, 3, ret);
  	vcpu->arch.hcall_needed = 0;
  	return RESUME_GUEST;
  }
  
  static int kvmppc_hcall_impl_hv(unsigned long cmd)
  {
  	switch (cmd) {
  	case H_CEDE:
  	case H_PROD:
  	case H_CONFER:
  	case H_REGISTER_VPA:
  	case H_SET_MODE:
  #ifdef CONFIG_KVM_XICS
  	case H_XIRR:
  	case H_CPPR:
  	case H_EOI:
  	case H_IPI:
  	case H_IPOLL:
  	case H_XIRR_X:
  #endif
  		return 1;
  	}
  
  	/* See if it's in the real-mode table */
  	return kvmppc_hcall_impl_hv_realmode(cmd);
  }
  
  static int kvmppc_emulate_debug_inst(struct kvm_run *run,
  					struct kvm_vcpu *vcpu)
  {
  	u32 last_inst;
  
  	if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst) !=
  					EMULATE_DONE) {
  		/*
  		 * Fetch failed, so return to guest and
  		 * try executing it again.
  		 */
  		return RESUME_GUEST;
  	}
  
  	if (last_inst == KVMPPC_INST_SW_BREAKPOINT) {
  		run->exit_reason = KVM_EXIT_DEBUG;
  		run->debug.arch.address = kvmppc_get_pc(vcpu);
  		return RESUME_HOST;
  	} else {
  		kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
  		return RESUME_GUEST;
  	}
  }
  
  static int kvmppc_handle_exit_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
  				 struct task_struct *tsk)
  {
  	int r = RESUME_HOST;
  
  	vcpu->stat.sum_exits++;
  
  	run->exit_reason = KVM_EXIT_UNKNOWN;
  	run->ready_for_interrupt_injection = 1;
  	switch (vcpu->arch.trap) {
  	/* We're good on these - the host merely wanted to get our attention */
  	case BOOK3S_INTERRUPT_HV_DECREMENTER:
  		vcpu->stat.dec_exits++;
  		r = RESUME_GUEST;
  		break;
  	case BOOK3S_INTERRUPT_EXTERNAL:
  	case BOOK3S_INTERRUPT_H_DOORBELL:
  		vcpu->stat.ext_intr_exits++;
  		r = RESUME_GUEST;
  		break;
  	case BOOK3S_INTERRUPT_PERFMON:
  		r = RESUME_GUEST;
  		break;
  	case BOOK3S_INTERRUPT_MACHINE_CHECK:
  		/*
  		 * Deliver a machine check interrupt to the guest.
  		 * We have to do this, even if the host has handled the
  		 * machine check, because machine checks use SRR0/1 and
  		 * the interrupt might have trashed guest state in them.
  		 */
  		kvmppc_book3s_queue_irqprio(vcpu,
  					    BOOK3S_INTERRUPT_MACHINE_CHECK);
  		r = RESUME_GUEST;
  		break;
  	case BOOK3S_INTERRUPT_PROGRAM:
  	{
  		ulong flags;
  		/*
  		 * Normally program interrupts are delivered directly
  		 * to the guest by the hardware, but we can get here
  		 * as a result of a hypervisor emulation interrupt
  		 * (e40) getting turned into a 700 by BML RTAS.
  		 */
  		flags = vcpu->arch.shregs.msr & 0x1f0000ull;
  		kvmppc_core_queue_program(vcpu, flags);
  		r = RESUME_GUEST;
  		break;
  	}
  	case BOOK3S_INTERRUPT_SYSCALL:
  	{
  		/* hcall - punt to userspace */
  		int i;
  
  		/* hypercall with MSR_PR has already been handled in rmode,
  		 * and never reaches here.
  		 */
  
  		run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3);
  		for (i = 0; i < 9; ++i)
  			run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i);
  		run->exit_reason = KVM_EXIT_PAPR_HCALL;
  		vcpu->arch.hcall_needed = 1;
  		r = RESUME_HOST;
  		break;
  	}
  	/*
  	 * We get these next two if the guest accesses a page which it thinks
  	 * it has mapped but which is not actually present, either because
  	 * it is for an emulated I/O device or because the corresonding
  	 * host page has been paged out.  Any other HDSI/HISI interrupts
  	 * have been handled already.
  	 */
  	case BOOK3S_INTERRUPT_H_DATA_STORAGE:
  		r = RESUME_PAGE_FAULT;
  		break;
  	case BOOK3S_INTERRUPT_H_INST_STORAGE:
  		vcpu->arch.fault_dar = kvmppc_get_pc(vcpu);
  		vcpu->arch.fault_dsisr = 0;
  		r = RESUME_PAGE_FAULT;
  		break;
  	/*
  	 * This occurs if the guest executes an illegal instruction.
  	 * If the guest debug is disabled, generate a program interrupt
  	 * to the guest. If guest debug is enabled, we need to check
  	 * whether the instruction is a software breakpoint instruction.
  	 * Accordingly return to Guest or Host.
  	 */
  	case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
  		if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) {
  			r = kvmppc_emulate_debug_inst(run, vcpu);
  		} else {
  			kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
  			r = RESUME_GUEST;
  		}
  		break;
  	/*
  	 * This occurs if the guest (kernel or userspace), does something that
  	 * is prohibited by HFSCR.  We just generate a program interrupt to
  	 * the guest.
  	 */
  	case BOOK3S_INTERRUPT_H_FAC_UNAVAIL:
  		kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
  		r = RESUME_GUEST;
  		break;
  	default:
  		kvmppc_dump_regs(vcpu);
  		printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
  			vcpu->arch.trap, kvmppc_get_pc(vcpu),
  			vcpu->arch.shregs.msr);
  		run->hw.hardware_exit_reason = vcpu->arch.trap;
  		r = RESUME_HOST;
  		break;
  	}
  
  	return r;
  }
  
  static int kvm_arch_vcpu_ioctl_get_sregs_hv(struct kvm_vcpu *vcpu,
  					    struct kvm_sregs *sregs)
  {
  	int i;
  
  	memset(sregs, 0, sizeof(struct kvm_sregs));
  	sregs->pvr = vcpu->arch.pvr;
  	for (i = 0; i < vcpu->arch.slb_max; i++) {
  		sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige;
  		sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
  	}
  
  	return 0;
  }
  
  static int kvm_arch_vcpu_ioctl_set_sregs_hv(struct kvm_vcpu *vcpu,
  					    struct kvm_sregs *sregs)
  {
  	int i, j;
  
  	/* Only accept the same PVR as the host's, since we can't spoof it */
  	if (sregs->pvr != vcpu->arch.pvr)
  		return -EINVAL;
  
  	j = 0;
  	for (i = 0; i < vcpu->arch.slb_nr; i++) {
  		if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) {
  			vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe;
  			vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv;
  			++j;
  		}
  	}
  	vcpu->arch.slb_max = j;
  
  	return 0;
  }
  
  static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr,
  		bool preserve_top32)
  {
  	struct kvmppc_vcore *vc = vcpu->arch.vcore;
  	u64 mask;
  
  	spin_lock(&vc->lock);
  	/*
  	 * If ILE (interrupt little-endian) has changed, update the
  	 * MSR_LE bit in the intr_msr for each vcpu in this vcore.
  	 */
  	if ((new_lpcr & LPCR_ILE) != (vc->lpcr & LPCR_ILE)) {
  		struct kvm *kvm = vcpu->kvm;
  		struct kvm_vcpu *vcpu;
  		int i;
  
  		mutex_lock(&kvm->lock);
  		kvm_for_each_vcpu(i, vcpu, kvm) {
  			if (vcpu->arch.vcore != vc)
  				continue;
  			if (new_lpcr & LPCR_ILE)
  				vcpu->arch.intr_msr |= MSR_LE;
  			else
  				vcpu->arch.intr_msr &= ~MSR_LE;
  		}
  		mutex_unlock(&kvm->lock);
  	}
  
  	/*
  	 * Userspace can only modify DPFD (default prefetch depth),
  	 * ILE (interrupt little-endian) and TC (translation control).
  	 * On POWER8 userspace can also modify AIL (alt. interrupt loc.)
  	 */
  	mask = LPCR_DPFD | LPCR_ILE | LPCR_TC;
  	if (cpu_has_feature(CPU_FTR_ARCH_207S))
  		mask |= LPCR_AIL;
  
  	/* Broken 32-bit version of LPCR must not clear top bits */
  	if (preserve_top32)
  		mask &= 0xFFFFFFFF;
  	vc->lpcr = (vc->lpcr & ~mask) | (new_lpcr & mask);
  	spin_unlock(&vc->lock);
  }
  
  static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
  				 union kvmppc_one_reg *val)
  {
  	int r = 0;
  	long int i;
  
  	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, 0);
  		break;
  	case KVM_REG_PPC_DABR:
  		*val = get_reg_val(id, vcpu->arch.dabr);
  		break;
  	case KVM_REG_PPC_DABRX:
  		*val = get_reg_val(id, vcpu->arch.dabrx);
  		break;
  	case KVM_REG_PPC_DSCR:
  		*val = get_reg_val(id, vcpu->arch.dscr);
  		break;
  	case KVM_REG_PPC_PURR:
  		*val = get_reg_val(id, vcpu->arch.purr);
  		break;
  	case KVM_REG_PPC_SPURR:
  		*val = get_reg_val(id, vcpu->arch.spurr);
  		break;
  	case KVM_REG_PPC_AMR:
  		*val = get_reg_val(id, vcpu->arch.amr);
  		break;
  	case KVM_REG_PPC_UAMOR:
  		*val = get_reg_val(id, vcpu->arch.uamor);
  		break;
  	case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRS:
  		i = id - KVM_REG_PPC_MMCR0;
  		*val = get_reg_val(id, vcpu->arch.mmcr[i]);
  		break;
  	case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
  		i = id - KVM_REG_PPC_PMC1;
  		*val = get_reg_val(id, vcpu->arch.pmc[i]);
  		break;
  	case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2:
  		i = id - KVM_REG_PPC_SPMC1;
  		*val = get_reg_val(id, vcpu->arch.spmc[i]);
  		break;
  	case KVM_REG_PPC_SIAR:
  		*val = get_reg_val(id, vcpu->arch.siar);
  		break;
  	case KVM_REG_PPC_SDAR:
  		*val = get_reg_val(id, vcpu->arch.sdar);
  		break;
  	case KVM_REG_PPC_SIER:
  		*val = get_reg_val(id, vcpu->arch.sier);
  		break;
  	case KVM_REG_PPC_IAMR:
  		*val = get_reg_val(id, vcpu->arch.iamr);
  		break;
  	case KVM_REG_PPC_PSPB:
  		*val = get_reg_val(id, vcpu->arch.pspb);
  		break;
  	case KVM_REG_PPC_DPDES:
  		*val = get_reg_val(id, vcpu->arch.vcore->dpdes);
  		break;
  	case KVM_REG_PPC_DAWR:
  		*val = get_reg_val(id, vcpu->arch.dawr);
  		break;
  	case KVM_REG_PPC_DAWRX:
  		*val = get_reg_val(id, vcpu->arch.dawrx);
  		break;
  	case KVM_REG_PPC_CIABR:
  		*val = get_reg_val(id, vcpu->arch.ciabr);
  		break;
  	case KVM_REG_PPC_CSIGR:
  		*val = get_reg_val(id, vcpu->arch.csigr);
  		break;
  	case KVM_REG_PPC_TACR:
  		*val = get_reg_val(id, vcpu->arch.tacr);
  		break;
  	case KVM_REG_PPC_TCSCR:
  		*val = get_reg_val(id, vcpu->arch.tcscr);
  		break;
  	case KVM_REG_PPC_PID:
  		*val = get_reg_val(id, vcpu->arch.pid);
  		break;
  	case KVM_REG_PPC_ACOP:
  		*val = get_reg_val(id, vcpu->arch.acop);
  		break;
  	case KVM_REG_PPC_WORT:
  		*val = get_reg_val(id, vcpu->arch.wort);
  		break;
  	case KVM_REG_PPC_VPA_ADDR:
  		spin_lock(&vcpu->arch.vpa_update_lock);
  		*val = get_reg_val(id, vcpu->arch.vpa.next_gpa);
  		spin_unlock(&vcpu->arch.vpa_update_lock);
  		break;
  	case KVM_REG_PPC_VPA_SLB:
  		spin_lock(&vcpu->arch.vpa_update_lock);
  		val->vpaval.addr = vcpu->arch.slb_shadow.next_gpa;
  		val->vpaval.length = vcpu->arch.slb_shadow.len;
  		spin_unlock(&vcpu->arch.vpa_update_lock);
  		break;
  	case KVM_REG_PPC_VPA_DTL:
  		spin_lock(&vcpu->arch.vpa_update_lock);
  		val->vpaval.addr = vcpu->arch.dtl.next_gpa;
  		val->vpaval.length = vcpu->arch.dtl.len;
  		spin_unlock(&vcpu->arch.vpa_update_lock);
  		break;
  	case KVM_REG_PPC_TB_OFFSET:
  		*val = get_reg_val(id, vcpu->arch.vcore->tb_offset);
  		break;
  	case KVM_REG_PPC_LPCR:
  	case KVM_REG_PPC_LPCR_64:
  		*val = get_reg_val(id, vcpu->arch.vcore->lpcr);
  		break;
  	case KVM_REG_PPC_PPR:
  		*val = get_reg_val(id, vcpu->arch.ppr);
  		break;
  #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
  	case KVM_REG_PPC_TFHAR:
  		*val = get_reg_val(id, vcpu->arch.tfhar);
  		break;
  	case KVM_REG_PPC_TFIAR:
  		*val = get_reg_val(id, vcpu->arch.tfiar);
  		break;
  	case KVM_REG_PPC_TEXASR:
  		*val = get_reg_val(id, vcpu->arch.texasr);
  		break;
  	case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
  		i = id - KVM_REG_PPC_TM_GPR0;
  		*val = get_reg_val(id, vcpu->arch.gpr_tm[i]);
  		break;
  	case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
  	{
  		int j;
  		i = id - KVM_REG_PPC_TM_VSR0;
  		if (i < 32)
  			for (j = 0; j < TS_FPRWIDTH; j++)
  				val->vsxval[j] = vcpu->arch.fp_tm.fpr[i][j];
  		else {
  			if (cpu_has_feature(CPU_FTR_ALTIVEC))
  				val->vval = vcpu->arch.vr_tm.vr[i-32];
  			else
  				r = -ENXIO;
  		}
  		break;
  	}
  	case KVM_REG_PPC_TM_CR:
  		*val = get_reg_val(id, vcpu->arch.cr_tm);
  		break;
  	case KVM_REG_PPC_TM_XER:
  		*val = get_reg_val(id, vcpu->arch.xer_tm);
  		break;
  	case KVM_REG_PPC_TM_LR:
  		*val = get_reg_val(id, vcpu->arch.lr_tm);
  		break;
  	case KVM_REG_PPC_TM_CTR:
  		*val = get_reg_val(id, vcpu->arch.ctr_tm);
  		break;
  	case KVM_REG_PPC_TM_FPSCR:
  		*val = get_reg_val(id, vcpu->arch.fp_tm.fpscr);
  		break;
  	case KVM_REG_PPC_TM_AMR:
  		*val = get_reg_val(id, vcpu->arch.amr_tm);
  		break;
  	case KVM_REG_PPC_TM_PPR:
  		*val = get_reg_val(id, vcpu->arch.ppr_tm);
  		break;
  	case KVM_REG_PPC_TM_VRSAVE:
  		*val = get_reg_val(id, vcpu->arch.vrsave_tm);
  		break;
  	case KVM_REG_PPC_TM_VSCR:
  		if (cpu_has_feature(CPU_FTR_ALTIVEC))
  			*val = get_reg_val(id, vcpu->arch.vr_tm.vscr.u[3]);
  		else
  			r = -ENXIO;
  		break;
  	case KVM_REG_PPC_TM_DSCR:
  		*val = get_reg_val(id, vcpu->arch.dscr_tm);
  		break;
  	case KVM_REG_PPC_TM_TAR:
  		*val = get_reg_val(id, vcpu->arch.tar_tm);
  		break;
  #endif
  	case KVM_REG_PPC_ARCH_COMPAT:
  		*val = get_reg_val(id, vcpu->arch.vcore->arch_compat);
  		break;
  	default:
  		r = -EINVAL;
  		break;
  	}
  
  	return r;
  }
  
  static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
  				 union kvmppc_one_reg *val)
  {
  	int r = 0;
  	long int i;
  	unsigned long addr, len;
  
  	switch (id) {
  	case KVM_REG_PPC_HIOR:
  		/* Only allow this to be set to zero */
  		if (set_reg_val(id, *val))
  			r = -EINVAL;
  		break;
  	case KVM_REG_PPC_DABR:
  		vcpu->arch.dabr = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_DABRX:
  		vcpu->arch.dabrx = set_reg_val(id, *val) & ~DABRX_HYP;
  		break;
  	case KVM_REG_PPC_DSCR:
  		vcpu->arch.dscr = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_PURR:
  		vcpu->arch.purr = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_SPURR:
  		vcpu->arch.spurr = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_AMR:
  		vcpu->arch.amr = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_UAMOR:
  		vcpu->arch.uamor = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRS:
  		i = id - KVM_REG_PPC_MMCR0;
  		vcpu->arch.mmcr[i] = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
  		i = id - KVM_REG_PPC_PMC1;
  		vcpu->arch.pmc[i] = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2:
  		i = id - KVM_REG_PPC_SPMC1;
  		vcpu->arch.spmc[i] = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_SIAR:
  		vcpu->arch.siar = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_SDAR:
  		vcpu->arch.sdar = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_SIER:
  		vcpu->arch.sier = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_IAMR:
  		vcpu->arch.iamr = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_PSPB:
  		vcpu->arch.pspb = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_DPDES:
  		vcpu->arch.vcore->dpdes = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_DAWR:
  		vcpu->arch.dawr = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_DAWRX:
  		vcpu->arch.dawrx = set_reg_val(id, *val) & ~DAWRX_HYP;
  		break;
  	case KVM_REG_PPC_CIABR:
  		vcpu->arch.ciabr = set_reg_val(id, *val);
  		/* Don't allow setting breakpoints in hypervisor code */
  		if ((vcpu->arch.ciabr & CIABR_PRIV) == CIABR_PRIV_HYPER)
  			vcpu->arch.ciabr &= ~CIABR_PRIV;	/* disable */
  		break;
  	case KVM_REG_PPC_CSIGR:
  		vcpu->arch.csigr = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_TACR:
  		vcpu->arch.tacr = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_TCSCR:
  		vcpu->arch.tcscr = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_PID:
  		vcpu->arch.pid = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_ACOP:
  		vcpu->arch.acop = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_WORT:
  		vcpu->arch.wort = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_VPA_ADDR:
  		addr = set_reg_val(id, *val);
  		r = -EINVAL;
  		if (!addr && (vcpu->arch.slb_shadow.next_gpa ||
  			      vcpu->arch.dtl.next_gpa))
  			break;
  		r = set_vpa(vcpu, &vcpu->arch.vpa, addr, sizeof(struct lppaca));
  		break;
  	case KVM_REG_PPC_VPA_SLB:
  		addr = val->vpaval.addr;
  		len = val->vpaval.length;
  		r = -EINVAL;
  		if (addr && !vcpu->arch.vpa.next_gpa)
  			break;
  		r = set_vpa(vcpu, &vcpu->arch.slb_shadow, addr, len);
  		break;
  	case KVM_REG_PPC_VPA_DTL:
  		addr = val->vpaval.addr;
  		len = val->vpaval.length;
  		r = -EINVAL;
  		if (addr && (len < sizeof(struct dtl_entry) ||
  			     !vcpu->arch.vpa.next_gpa))
  			break;
  		len -= len % sizeof(struct dtl_entry);
  		r = set_vpa(vcpu, &vcpu->arch.dtl, addr, len);
  		break;
  	case KVM_REG_PPC_TB_OFFSET:
  		/* round up to multiple of 2^24 */
  		vcpu->arch.vcore->tb_offset =
  			ALIGN(set_reg_val(id, *val), 1UL << 24);
  		break;
  	case KVM_REG_PPC_LPCR:
  		kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), true);
  		break;
  	case KVM_REG_PPC_LPCR_64:
  		kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), false);
  		break;
  	case KVM_REG_PPC_PPR:
  		vcpu->arch.ppr = set_reg_val(id, *val);
  		break;
  #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
  	case KVM_REG_PPC_TFHAR:
  		vcpu->arch.tfhar = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_TFIAR:
  		vcpu->arch.tfiar = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_TEXASR:
  		vcpu->arch.texasr = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
  		i = id - KVM_REG_PPC_TM_GPR0;
  		vcpu->arch.gpr_tm[i] = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
  	{
  		int j;
  		i = id - KVM_REG_PPC_TM_VSR0;
  		if (i < 32)
  			for (j = 0; j < TS_FPRWIDTH; j++)
  				vcpu->arch.fp_tm.fpr[i][j] = val->vsxval[j];
  		else
  			if (cpu_has_feature(CPU_FTR_ALTIVEC))
  				vcpu->arch.vr_tm.vr[i-32] = val->vval;
  			else
  				r = -ENXIO;
  		break;
  	}
  	case KVM_REG_PPC_TM_CR:
  		vcpu->arch.cr_tm = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_TM_XER:
  		vcpu->arch.xer_tm = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_TM_LR:
  		vcpu->arch.lr_tm = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_TM_CTR:
  		vcpu->arch.ctr_tm = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_TM_FPSCR:
  		vcpu->arch.fp_tm.fpscr = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_TM_AMR:
  		vcpu->arch.amr_tm = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_TM_PPR:
  		vcpu->arch.ppr_tm = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_TM_VRSAVE:
  		vcpu->arch.vrsave_tm = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_TM_VSCR:
  		if (cpu_has_feature(CPU_FTR_ALTIVEC))
  			vcpu->arch.vr.vscr.u[3] = set_reg_val(id, *val);
  		else
  			r = - ENXIO;
  		break;
  	case KVM_REG_PPC_TM_DSCR:
  		vcpu->arch.dscr_tm = set_reg_val(id, *val);
  		break;
  	case KVM_REG_PPC_TM_TAR:
  		vcpu->arch.tar_tm = set_reg_val(id, *val);
  		break;
  #endif
  	case KVM_REG_PPC_ARCH_COMPAT:
  		r = kvmppc_set_arch_compat(vcpu, set_reg_val(id, *val));
  		break;
  	default:
  		r = -EINVAL;
  		break;
  	}
  
  	return r;
  }
  
  static struct kvmppc_vcore *kvmppc_vcore_create(struct kvm *kvm, int core)
  {
  	struct kvmppc_vcore *vcore;
  
  	vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL);
  
  	if (vcore == NULL)
  		return NULL;
  
  	INIT_LIST_HEAD(&vcore->runnable_threads);
  	spin_lock_init(&vcore->lock);
  	init_waitqueue_head(&vcore->wq);
  	vcore->preempt_tb = TB_NIL;
  	vcore->lpcr = kvm->arch.lpcr;
  	vcore->first_vcpuid = core * threads_per_subcore;
  	vcore->kvm = kvm;
  
  	vcore->mpp_buffer_is_valid = false;
  
  	if (cpu_has_feature(CPU_FTR_ARCH_207S))
  		vcore->mpp_buffer = (void *)__get_free_pages(
  			GFP_KERNEL|__GFP_ZERO,
  			MPP_BUFFER_ORDER);
  
  	return vcore;
  }
  
  static struct kvm_vcpu *kvmppc_core_vcpu_create_hv(struct kvm *kvm,
  						   unsigned int id)
  {
  	struct kvm_vcpu *vcpu;
  	int err = -EINVAL;
  	int core;
  	struct kvmppc_vcore *vcore;
  
  	core = id / threads_per_subcore;
  	if (core >= KVM_MAX_VCORES)
  		goto out;
  
  	err = -ENOMEM;
  	vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
  	if (!vcpu)
  		goto out;
  
  	err = kvm_vcpu_init(vcpu, kvm, id);
  	if (err)
  		goto free_vcpu;
  
  	vcpu->arch.shared = &vcpu->arch.shregs;
  #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
  	/*
  	 * The shared struct is never shared on HV,
  	 * so we can always use host endianness
  	 */
  #ifdef __BIG_ENDIAN__
  	vcpu->arch.shared_big_endian = true;
  #else
  	vcpu->arch.shared_big_endian = false;
  #endif
  #endif
  	vcpu->arch.mmcr[0] = MMCR0_FC;
  	vcpu->arch.ctrl = CTRL_RUNLATCH;
  	/* default to host PVR, since we can't spoof it */
  	kvmppc_set_pvr_hv(vcpu, mfspr(SPRN_PVR));
  	spin_lock_init(&vcpu->arch.vpa_update_lock);
  	spin_lock_init(&vcpu->arch.tbacct_lock);
  	vcpu->arch.busy_preempt = TB_NIL;
  	vcpu->arch.intr_msr = MSR_SF | MSR_ME;
  
  	kvmppc_mmu_book3s_hv_init(vcpu);
  
  	vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
  
  	init_waitqueue_head(&vcpu->arch.cpu_run);
  
  	mutex_lock(&kvm->lock);
  	vcore = kvm->arch.vcores[core];
  	if (!vcore) {
  		vcore = kvmppc_vcore_create(kvm, core);
  		kvm->arch.vcores[core] = vcore;
  		kvm->arch.online_vcores++;
  	}
  	mutex_unlock(&kvm->lock);
  
  	if (!vcore)
  		goto free_vcpu;
  
  	spin_lock(&vcore->lock);
  	++vcore->num_threads;
  	spin_unlock(&vcore->lock);
  	vcpu->arch.vcore = vcore;
  	vcpu->arch.ptid = vcpu->vcpu_id - vcore->first_vcpuid;
  
  	vcpu->arch.cpu_type = KVM_CPU_3S_64;
  	kvmppc_sanity_check(vcpu);
  
  	return vcpu;
  
  free_vcpu:
  	kmem_cache_free(kvm_vcpu_cache, vcpu);
  out:
  	return ERR_PTR(err);
  }
  
  static void unpin_vpa(struct kvm *kvm, struct kvmppc_vpa *vpa)
  {
  	if (vpa->pinned_addr)
  		kvmppc_unpin_guest_page(kvm, vpa->pinned_addr, vpa->gpa,
  					vpa->dirty);
  }
  
  static void kvmppc_core_vcpu_free_hv(struct kvm_vcpu *vcpu)
  {
  	spin_lock(&vcpu->arch.vpa_update_lock);
  	unpin_vpa(vcpu->kvm, &vcpu->arch.dtl);
  	unpin_vpa(vcpu->kvm, &vcpu->arch.slb_shadow);
  	unpin_vpa(vcpu->kvm, &vcpu->arch.vpa);
  	spin_unlock(&vcpu->arch.vpa_update_lock);
  	kvm_vcpu_uninit(vcpu);
  	kmem_cache_free(kvm_vcpu_cache, vcpu);
  }
  
  static int kvmppc_core_check_requests_hv(struct kvm_vcpu *vcpu)
  {
  	/* Indicate we want to get back into the guest */
  	return 1;
  }
  
  static void kvmppc_set_timer(struct kvm_vcpu *vcpu)
  {
  	unsigned long dec_nsec, now;
  
  	now = get_tb();
  	if (now > vcpu->arch.dec_expires) {
  		/* decrementer has already gone negative */
  		kvmppc_core_queue_dec(vcpu);
  		kvmppc_core_prepare_to_enter(vcpu);
  		return;
  	}
  	dec_nsec = (vcpu->arch.dec_expires - now) * NSEC_PER_SEC
  		   / tb_ticks_per_sec;
  	hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, dec_nsec),
  		      HRTIMER_MODE_REL);
  	vcpu->arch.timer_running = 1;
  }
  
  static void kvmppc_end_cede(struct kvm_vcpu *vcpu)
  {
  	vcpu->arch.ceded = 0;
  	if (vcpu->arch.timer_running) {
  		hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
  		vcpu->arch.timer_running = 0;
  	}
  }
  
  extern void __kvmppc_vcore_entry(void);
  
  static void kvmppc_remove_runnable(struct kvmppc_vcore *vc,
  				   struct kvm_vcpu *vcpu)
  {
  	u64 now;
  
  	if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
  		return;
  	spin_lock_irq(&vcpu->arch.tbacct_lock);
  	now = mftb();
  	vcpu->arch.busy_stolen += vcore_stolen_time(vc, now) -
  		vcpu->arch.stolen_logged;
  	vcpu->arch.busy_preempt = now;
  	vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
  	spin_unlock_irq(&vcpu->arch.tbacct_lock);
  	--vc->n_runnable;
  	list_del(&vcpu->arch.run_list);
  }
  
  static int kvmppc_grab_hwthread(int cpu)
  {
  	struct paca_struct *tpaca;
  	long timeout = 10000;
  
  	tpaca = &paca[cpu];
  
  	/* Ensure the thread won't go into the kernel if it wakes */
  	tpaca->kvm_hstate.hwthread_req = 1;
  	tpaca->kvm_hstate.kvm_vcpu = NULL;
  
  	/*
  	 * If the thread is already executing in the kernel (e.g. handling
  	 * a stray interrupt), wait for it to get back to nap mode.
  	 * The smp_mb() is to ensure that our setting of hwthread_req
  	 * is visible before we look at hwthread_state, so if this
  	 * races with the code at system_reset_pSeries and the thread
  	 * misses our setting of hwthread_req, we are sure to see its
  	 * setting of hwthread_state, and vice versa.
  	 */
  	smp_mb();
  	while (tpaca->kvm_hstate.hwthread_state == KVM_HWTHREAD_IN_KERNEL) {
  		if (--timeout <= 0) {
  			pr_err("KVM: couldn't grab cpu %d\n", cpu);
  			return -EBUSY;
  		}
  		udelay(1);
  	}
  	return 0;
  }
  
  static void kvmppc_release_hwthread(int cpu)
  {
  	struct paca_struct *tpaca;
  
  	tpaca = &paca[cpu];
  	tpaca->kvm_hstate.hwthread_req = 0;
  	tpaca->kvm_hstate.kvm_vcpu = NULL;
  }
  
  static void kvmppc_start_thread(struct kvm_vcpu *vcpu)
  {
  	int cpu;
  	struct paca_struct *tpaca;
  	struct kvmppc_vcore *vc = vcpu->arch.vcore;
  
  	if (vcpu->arch.timer_running) {
  		hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
  		vcpu->arch.timer_running = 0;
  	}
  	cpu = vc->pcpu + vcpu->arch.ptid;
  	tpaca = &paca[cpu];
  	tpaca->kvm_hstate.kvm_vcpu = vcpu;
  	tpaca->kvm_hstate.kvm_vcore = vc;
  	tpaca->kvm_hstate.ptid = vcpu->arch.ptid;
  	vcpu->cpu = vc->pcpu;
  	smp_wmb();
  #if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP)
  	if (cpu != smp_processor_id()) {
  		xics_wake_cpu(cpu);
  		if (vcpu->arch.ptid)
  			++vc->n_woken;
  	}
  #endif
  }
  
  static void kvmppc_wait_for_nap(struct kvmppc_vcore *vc)
  {
  	int i;
  
  	HMT_low();
  	i = 0;
  	while (vc->nap_count < vc->n_woken) {
  		if (++i >= 1000000) {
  			pr_err("kvmppc_wait_for_nap timeout %d %d\n",
  			       vc->nap_count, vc->n_woken);
  			break;
  		}
  		cpu_relax();
  	}
  	HMT_medium();
  }
  
  /*
   * Check that we are on thread 0 and that any other threads in
   * this core are off-line.  Then grab the threads so they can't
   * enter the kernel.
   */
  static int on_primary_thread(void)
  {
  	int cpu = smp_processor_id();
  	int thr;
  
  	/* Are we on a primary subcore? */
  	if (cpu_thread_in_subcore(cpu))
  		return 0;
  
  	thr = 0;
  	while (++thr < threads_per_subcore)
  		if (cpu_online(cpu + thr))
  			return 0;
  
  	/* Grab all hw threads so they can't go into the kernel */
  	for (thr = 1; thr < threads_per_subcore; ++thr) {
  		if (kvmppc_grab_hwthread(cpu + thr)) {
  			/* Couldn't grab one; let the others go */
  			do {
  				kvmppc_release_hwthread(cpu + thr);
  			} while (--thr > 0);
  			return 0;
  		}
  	}
  	return 1;
  }
  
  static void kvmppc_start_saving_l2_cache(struct kvmppc_vcore *vc)
  {
  	phys_addr_t phy_addr, mpp_addr;
  
  	phy_addr = (phys_addr_t)virt_to_phys(vc->mpp_buffer);
  	mpp_addr = phy_addr & PPC_MPPE_ADDRESS_MASK;
  
  	mtspr(SPRN_MPPR, mpp_addr | PPC_MPPR_FETCH_ABORT);
  	logmpp(mpp_addr | PPC_LOGMPP_LOG_L2);
  
  	vc->mpp_buffer_is_valid = true;
  }
  
  static void kvmppc_start_restoring_l2_cache(const struct kvmppc_vcore *vc)
  {
  	phys_addr_t phy_addr, mpp_addr;
  
  	phy_addr = virt_to_phys(vc->mpp_buffer);
  	mpp_addr = phy_addr & PPC_MPPE_ADDRESS_MASK;
  
  	/* We must abort any in-progress save operations to ensure
  	 * the table is valid so that prefetch engine knows when to
  	 * stop prefetching. */
  	logmpp(mpp_addr | PPC_LOGMPP_LOG_ABORT);
  	mtspr(SPRN_MPPR, mpp_addr | PPC_MPPR_FETCH_WHOLE_TABLE);
  }
  
  /*
   * Run a set of guest threads on a physical core.
   * Called with vc->lock held.
   */
  static void kvmppc_run_core(struct kvmppc_vcore *vc)
  {
  	struct kvm_vcpu *vcpu, *vnext;
  	long ret;
  	u64 now;
  	int i, need_vpa_update;
  	int srcu_idx;
  	struct kvm_vcpu *vcpus_to_update[threads_per_core];
  
  	/* don't start if any threads have a signal pending */
  	need_vpa_update = 0;
  	list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
  		if (signal_pending(vcpu->arch.run_task))
  			return;
  		if (vcpu->arch.vpa.update_pending ||
  		    vcpu->arch.slb_shadow.update_pending ||
  		    vcpu->arch.dtl.update_pending)
  			vcpus_to_update[need_vpa_update++] = vcpu;
  	}
  
  	/*
  	 * Initialize *vc, in particular vc->vcore_state, so we can
  	 * drop the vcore lock if necessary.
  	 */
  	vc->n_woken = 0;
  	vc->nap_count = 0;
  	vc->entry_exit_count = 0;
  	vc->vcore_state = VCORE_STARTING;
  	vc->in_guest = 0;
  	vc->napping_threads = 0;
  
  	/*
  	 * Updating any of the vpas requires calling kvmppc_pin_guest_page,
  	 * which can't be called with any spinlocks held.
  	 */
  	if (need_vpa_update) {
  		spin_unlock(&vc->lock);
  		for (i = 0; i < need_vpa_update; ++i)
  			kvmppc_update_vpas(vcpus_to_update[i]);
  		spin_lock(&vc->lock);
  	}
  
  	/*
  	 * Make sure we are running on primary threads, and that secondary
  	 * threads are offline.  Also check if the number of threads in this
  	 * guest are greater than the current system threads per guest.
  	 */
  	if ((threads_per_core > 1) &&
  	    ((vc->num_threads > threads_per_subcore) || !on_primary_thread())) {
  		list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
  			vcpu->arch.ret = -EBUSY;
  		goto out;
  	}
  
  
  	vc->pcpu = smp_processor_id();
  	list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
  		kvmppc_start_thread(vcpu);
  		kvmppc_create_dtl_entry(vcpu, vc);
  	}
  
  	/* Set this explicitly in case thread 0 doesn't have a vcpu */
  	get_paca()->kvm_hstate.kvm_vcore = vc;
  	get_paca()->kvm_hstate.ptid = 0;
  
  	vc->vcore_state = VCORE_RUNNING;
  	preempt_disable();
  	spin_unlock(&vc->lock);
  
  	kvm_guest_enter();
  
  	srcu_idx = srcu_read_lock(&vc->kvm->srcu);
  
  	if (vc->mpp_buffer_is_valid)
  		kvmppc_start_restoring_l2_cache(vc);
  
  	__kvmppc_vcore_entry();
  
  	spin_lock(&vc->lock);
  
  	if (vc->mpp_buffer)
  		kvmppc_start_saving_l2_cache(vc);
  
  	/* disable sending of IPIs on virtual external irqs */
  	list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
  		vcpu->cpu = -1;
  	/* wait for secondary threads to finish writing their state to memory */
  	if (vc->nap_count < vc->n_woken)
  		kvmppc_wait_for_nap(vc);
  	for (i = 0; i < threads_per_subcore; ++i)
  		kvmppc_release_hwthread(vc->pcpu + i);
  	/* prevent other vcpu threads from doing kvmppc_start_thread() now */
  	vc->vcore_state = VCORE_EXITING;
  	spin_unlock(&vc->lock);
  
  	srcu_read_unlock(&vc->kvm->srcu, srcu_idx);
  
  	/* make sure updates to secondary vcpu structs are visible now */
  	smp_mb();
  	kvm_guest_exit();
  
  	preempt_enable();
  	cond_resched();
  
  	spin_lock(&vc->lock);
  	now = get_tb();
  	list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
  		/* cancel pending dec exception if dec is positive */
  		if (now < vcpu->arch.dec_expires &&
  		    kvmppc_core_pending_dec(vcpu))
  			kvmppc_core_dequeue_dec(vcpu);
  
  		ret = RESUME_GUEST;
  		if (vcpu->arch.trap)
  			ret = kvmppc_handle_exit_hv(vcpu->arch.kvm_run, vcpu,
  						    vcpu->arch.run_task);
  
  		vcpu->arch.ret = ret;
  		vcpu->arch.trap = 0;
  
  		if (vcpu->arch.ceded) {
  			if (!is_kvmppc_resume_guest(ret))
  				kvmppc_end_cede(vcpu);
  			else
  				kvmppc_set_timer(vcpu);
  		}
  	}
  
   out:
  	vc->vcore_state = VCORE_INACTIVE;
  	list_for_each_entry_safe(vcpu, vnext, &vc->runnable_threads,
  				 arch.run_list) {
  		if (!is_kvmppc_resume_guest(vcpu->arch.ret)) {
  			kvmppc_remove_runnable(vc, vcpu);
  			wake_up(&vcpu->arch.cpu_run);
  		}
  	}
  }
  
  /*
   * Wait for some other vcpu thread to execute us, and
   * wake us up when we need to handle something in the host.
   */
  static void kvmppc_wait_for_exec(struct kvm_vcpu *vcpu, int wait_state)
  {
  	DEFINE_WAIT(wait);
  
  	prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state);
  	if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE)
  		schedule();
  	finish_wait(&vcpu->arch.cpu_run, &wait);
  }
  
  /*
   * All the vcpus in this vcore are idle, so wait for a decrementer
   * or external interrupt to one of the vcpus.  vc->lock is held.
   */
  static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
  {
  	DEFINE_WAIT(wait);
  
  	prepare_to_wait(&vc->wq, &wait, TASK_INTERRUPTIBLE);
  	vc->vcore_state = VCORE_SLEEPING;
  	spin_unlock(&vc->lock);
  	schedule();
  	finish_wait(&vc->wq, &wait);
  	spin_lock(&vc->lock);
  	vc->vcore_state = VCORE_INACTIVE;
  }
  
  static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
  {
  	int n_ceded;
  	struct kvmppc_vcore *vc;
  	struct kvm_vcpu *v, *vn;
  
  	kvm_run->exit_reason = 0;
  	vcpu->arch.ret = RESUME_GUEST;
  	vcpu->arch.trap = 0;
  	kvmppc_update_vpas(vcpu);
  
  	/*
  	 * Synchronize with other threads in this virtual core
  	 */
  	vc = vcpu->arch.vcore;
  	spin_lock(&vc->lock);
  	vcpu->arch.ceded = 0;
  	vcpu->arch.run_task = current;
  	vcpu->arch.kvm_run = kvm_run;
  	vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb());
  	vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
  	vcpu->arch.busy_preempt = TB_NIL;
  	list_add_tail(&vcpu->arch.run_list, &vc->runnable_threads);
  	++vc->n_runnable;
  
  	/*
  	 * This happens the first time this is called for a vcpu.
  	 * If the vcore is already running, we may be able to start
  	 * this thread straight away and have it join in.
  	 */
  	if (!signal_pending(current)) {
  		if (vc->vcore_state == VCORE_RUNNING &&
  		    VCORE_EXIT_COUNT(vc) == 0) {
  			kvmppc_create_dtl_entry(vcpu, vc);
  			kvmppc_start_thread(vcpu);
  		} else if (vc->vcore_state == VCORE_SLEEPING) {
  			wake_up(&vc->wq);
  		}
  
  	}
  
  	while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
  	       !signal_pending(current)) {
  		if (vc->vcore_state != VCORE_INACTIVE) {
  			spin_unlock(&vc->lock);
  			kvmppc_wait_for_exec(vcpu, TASK_INTERRUPTIBLE);
  			spin_lock(&vc->lock);
  			continue;
  		}
  		list_for_each_entry_safe(v, vn, &vc->runnable_threads,
  					 arch.run_list) {
  			kvmppc_core_prepare_to_enter(v);
  			if (signal_pending(v->arch.run_task)) {
  				kvmppc_remove_runnable(vc, v);
  				v->stat.signal_exits++;
  				v->arch.kvm_run->exit_reason = KVM_EXIT_INTR;
  				v->arch.ret = -EINTR;
  				wake_up(&v->arch.cpu_run);
  			}
  		}
  		if (!vc->n_runnable || vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
  			break;
  		vc->runner = vcpu;
  		n_ceded = 0;
  		list_for_each_entry(v, &vc->runnable_threads, arch.run_list) {
  			if (!v->arch.pending_exceptions)
  				n_ceded += v->arch.ceded;
  			else
  				v->arch.ceded = 0;
  		}
  		if (n_ceded == vc->n_runnable)
  			kvmppc_vcore_blocked(vc);
  		else
  			kvmppc_run_core(vc);
  		vc->runner = NULL;
  	}
  
  	while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
  	       (vc->vcore_state == VCORE_RUNNING ||
  		vc->vcore_state == VCORE_EXITING)) {
  		spin_unlock(&vc->lock);
  		kvmppc_wait_for_exec(vcpu, TASK_UNINTERRUPTIBLE);
  		spin_lock(&vc->lock);
  	}
  
  	if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
  		kvmppc_remove_runnable(vc, vcpu);
  		vcpu->stat.signal_exits++;
  		kvm_run->exit_reason = KVM_EXIT_INTR;
  		vcpu->arch.ret = -EINTR;
  	}
  
  	if (vc->n_runnable && vc->vcore_state == VCORE_INACTIVE) {
  		/* Wake up some vcpu to run the core */
  		v = list_first_entry(&vc->runnable_threads,
  				     struct kvm_vcpu, arch.run_list);
  		wake_up(&v->arch.cpu_run);
  	}
  
  	spin_unlock(&vc->lock);
  	return vcpu->arch.ret;
  }
  
  static int kvmppc_vcpu_run_hv(struct kvm_run *run, struct kvm_vcpu *vcpu)
  {
  	int r;
  	int srcu_idx;
  	unsigned long ebb_regs[3] = {};	/* shut up GCC */
  	unsigned long user_tar = 0;
  	unsigned long proc_fscr = 0;
  	unsigned int user_vrsave;
  
  	if (!vcpu->arch.sane) {
  		run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
  		return -EINVAL;
  	}
  
  	/*
  	 * Don't allow entry with a suspended transaction, because
  	 * the guest entry/exit code will lose it.
  	 * If the guest has TM enabled, save away their TM-related SPRs
  	 * (they will get restored by the TM unavailable interrupt).
  	 */
  #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
  	if (cpu_has_feature(CPU_FTR_TM) && current->thread.regs &&
  	    (current->thread.regs->msr & MSR_TM)) {
  		if (MSR_TM_ACTIVE(current->thread.regs->msr)) {
  			run->exit_reason = KVM_EXIT_FAIL_ENTRY;
  			run->fail_entry.hardware_entry_failure_reason = 0;
  			return -EINVAL;
  		}
  		/* Enable TM so we can read the TM SPRs */
  		mtmsr(mfmsr() | MSR_TM);
  		current->thread.tm_tfhar = mfspr(SPRN_TFHAR);
  		current->thread.tm_tfiar = mfspr(SPRN_TFIAR);
  		current->thread.tm_texasr = mfspr(SPRN_TEXASR);
  	}
  #endif
  
  	kvmppc_core_prepare_to_enter(vcpu);
  
  	/* No need to go into the guest when all we'll do is come back out */
  	if (signal_pending(current)) {
  		run->exit_reason = KVM_EXIT_INTR;
  		return -EINTR;
  	}
  
  	atomic_inc(&vcpu->kvm->arch.vcpus_running);
  	/* Order vcpus_running vs. rma_setup_done, see kvmppc_alloc_reset_hpt */
  	smp_mb();
  
  	/* On the first time here, set up HTAB and VRMA or RMA */
  	if (!vcpu->kvm->arch.rma_setup_done) {
  		r = kvmppc_hv_setup_htab_rma(vcpu);
  		if (r)
  			goto out;
  	}
  
  	flush_fp_to_thread(current);
  	flush_altivec_to_thread(current);
  	flush_vsx_to_thread(current);
  
  	/* Save userspace EBB and other register values */
  	if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
  		ebb_regs[0] = mfspr(SPRN_EBBHR);
  		ebb_regs[1] = mfspr(SPRN_EBBRR);
  		ebb_regs[2] = mfspr(SPRN_BESCR);
  		user_tar = mfspr(SPRN_TAR);
  		proc_fscr = mfspr(SPRN_FSCR);
  	}
  	user_vrsave = mfspr(SPRN_VRSAVE);
  
  	vcpu->arch.wqp = &vcpu->arch.vcore->wq;
  	vcpu->arch.pgdir = current->mm->pgd;
  	vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
  
  	do {
  		r = kvmppc_run_vcpu(run, vcpu);
  
  		if (run->exit_reason == KVM_EXIT_PAPR_HCALL &&
  		    !(vcpu->arch.shregs.msr & MSR_PR)) {
  			r = kvmppc_pseries_do_hcall(vcpu);
  			kvmppc_core_prepare_to_enter(vcpu);
  		} else if (r == RESUME_PAGE_FAULT) {
  			srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
  			r = kvmppc_book3s_hv_page_fault(run, vcpu,
  				vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
  			srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
  		}
  	} while (is_kvmppc_resume_guest(r));
  
  	/* Restore userspace EBB and other register values */
  	if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
  		mtspr(SPRN_EBBHR, ebb_regs[0]);
  		mtspr(SPRN_EBBRR, ebb_regs[1]);
  		mtspr(SPRN_BESCR, ebb_regs[2]);
  		mtspr(SPRN_TAR, user_tar);
  		mtspr(SPRN_FSCR, proc_fscr);
  	}
  	mtspr(SPRN_VRSAVE, user_vrsave);
  
  	/*
  	 * Since we don't do lazy TM reload, we need to reload
  	 * the TM registers here.
  	 */
  #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
  	if (cpu_has_feature(CPU_FTR_TM) && current->thread.regs &&
  	    (current->thread.regs->msr & MSR_TM)) {
  		mtspr(SPRN_TFHAR, current->thread.tm_tfhar);
  		mtspr(SPRN_TFIAR, current->thread.tm_tfiar);
  		mtspr(SPRN_TEXASR, current->thread.tm_texasr);
  	}
  #endif
  
   out:
  	vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
  	atomic_dec(&vcpu->kvm->arch.vcpus_running);
  	return r;
  }
  
  
  /* Work out RMLS (real mode limit selector) field value for a given RMA size.
     Assumes POWER7 or PPC970. */
  static inline int lpcr_rmls(unsigned long rma_size)
  {
  	switch (rma_size) {
  	case 32ul << 20:	/* 32 MB */
  		if (cpu_has_feature(CPU_FTR_ARCH_206))
  			return 8;	/* only supported on POWER7 */
  		return -1;
  	case 64ul << 20:	/* 64 MB */
  		return 3;
  	case 128ul << 20:	/* 128 MB */
  		return 7;
  	case 256ul << 20:	/* 256 MB */
  		return 4;
  	case 1ul << 30:		/* 1 GB */
  		return 2;
  	case 16ul << 30:	/* 16 GB */
  		return 1;
  	case 256ul << 30:	/* 256 GB */
  		return 0;
  	default:
  		return -1;
  	}
  }
  
  static int kvm_rma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
  {
  	struct page *page;
  	struct kvm_rma_info *ri = vma->vm_file->private_data;
  
  	if (vmf->pgoff >= kvm_rma_pages)
  		return VM_FAULT_SIGBUS;
  
  	page = pfn_to_page(ri->base_pfn + vmf->pgoff);
  	get_page(page);
  	vmf->page = page;
  	return 0;
  }
  
  static const struct vm_operations_struct kvm_rma_vm_ops = {
  	.fault = kvm_rma_fault,
  };
  
  static int kvm_rma_mmap(struct file *file, struct vm_area_struct *vma)
  {
  	vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
  	vma->vm_ops = &kvm_rma_vm_ops;
  	return 0;
  }
  
  static int kvm_rma_release(struct inode *inode, struct file *filp)
  {
  	struct kvm_rma_info *ri = filp->private_data;
  
  	kvm_release_rma(ri);
  	return 0;
  }
  
  static const struct file_operations kvm_rma_fops = {
  	.mmap           = kvm_rma_mmap,
  	.release	= kvm_rma_release,
  };
  
  static long kvm_vm_ioctl_allocate_rma(struct kvm *kvm,
  				      struct kvm_allocate_rma *ret)
  {
  	long fd;
  	struct kvm_rma_info *ri;
  	/*
  	 * Only do this on PPC970 in HV mode
  	 */
  	if (!cpu_has_feature(CPU_FTR_HVMODE) ||
  	    !cpu_has_feature(CPU_FTR_ARCH_201))
  		return -EINVAL;
  
  	if (!kvm_rma_pages)
  		return -EINVAL;
  
  	ri = kvm_alloc_rma();
  	if (!ri)
  		return -ENOMEM;
  
  	fd = anon_inode_getfd("kvm-rma", &kvm_rma_fops, ri, O_RDWR | O_CLOEXEC);
  	if (fd < 0)
  		kvm_release_rma(ri);
  
  	ret->rma_size = kvm_rma_pages << PAGE_SHIFT;
  	return fd;
  }
  
  static void kvmppc_add_seg_page_size(struct kvm_ppc_one_seg_page_size **sps,
  				     int linux_psize)
  {
  	struct mmu_psize_def *def = &mmu_psize_defs[linux_psize];
  
  	if (!def->shift)
  		return;
  	(*sps)->page_shift = def->shift;
  	(*sps)->slb_enc = def->sllp;
  	(*sps)->enc[0].page_shift = def->shift;
  	(*sps)->enc[0].pte_enc = def->penc[linux_psize];
  	/*
  	 * Add 16MB MPSS support if host supports it
  	 */
  	if (linux_psize != MMU_PAGE_16M && def->penc[MMU_PAGE_16M] != -1) {
  		(*sps)->enc[1].page_shift = 24;
  		(*sps)->enc[1].pte_enc = def->penc[MMU_PAGE_16M];
  	}
  	(*sps)++;
  }
  
  static int kvm_vm_ioctl_get_smmu_info_hv(struct kvm *kvm,
  					 struct kvm_ppc_smmu_info *info)
  {
  	struct kvm_ppc_one_seg_page_size *sps;
  
  	info->flags = KVM_PPC_PAGE_SIZES_REAL;
  	if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
  		info->flags |= KVM_PPC_1T_SEGMENTS;
  	info->slb_size = mmu_slb_size;
  
  	/* We only support these sizes for now, and no muti-size segments */
  	sps = &info->sps[0];
  	kvmppc_add_seg_page_size(&sps, MMU_PAGE_4K);
  	kvmppc_add_seg_page_size(&sps, MMU_PAGE_64K);
  	kvmppc_add_seg_page_size(&sps, MMU_PAGE_16M);
  
  	return 0;
  }
  
  /*
   * Get (and clear) the dirty memory log for a memory slot.
   */
  static int kvm_vm_ioctl_get_dirty_log_hv(struct kvm *kvm,
  					 struct kvm_dirty_log *log)
  {
  	struct kvm_memory_slot *memslot;
  	int r;
  	unsigned long n;
  
  	mutex_lock(&kvm->slots_lock);
  
  	r = -EINVAL;
  	if (log->slot >= KVM_USER_MEM_SLOTS)
  		goto out;
  
  	memslot = id_to_memslot(kvm->memslots, log->slot);
  	r = -ENOENT;
  	if (!memslot->dirty_bitmap)
  		goto out;
  
  	n = kvm_dirty_bitmap_bytes(memslot);
  	memset(memslot->dirty_bitmap, 0, n);
  
  	r = kvmppc_hv_get_dirty_log(kvm, memslot, memslot->dirty_bitmap);
  	if (r)
  		goto out;
  
  	r = -EFAULT;
  	if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
  		goto out;
  
  	r = 0;
  out:
  	mutex_unlock(&kvm->slots_lock);
  	return r;
  }
  
  static void unpin_slot(struct kvm_memory_slot *memslot)
  {
  	unsigned long *physp;
  	unsigned long j, npages, pfn;
  	struct page *page;
  
  	physp = memslot->arch.slot_phys;
  	npages = memslot->npages;
  	if (!physp)
  		return;
  	for (j = 0; j < npages; j++) {
  		if (!(physp[j] & KVMPPC_GOT_PAGE))
  			continue;
  		pfn = physp[j] >> PAGE_SHIFT;
  		page = pfn_to_page(pfn);
  		SetPageDirty(page);
  		put_page(page);
  	}
  }
  
  static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *free,
  					struct kvm_memory_slot *dont)
  {
  	if (!dont || free->arch.rmap != dont->arch.rmap) {
  		vfree(free->arch.rmap);
  		free->arch.rmap = NULL;
  	}
  	if (!dont || free->arch.slot_phys != dont->arch.slot_phys) {
  		unpin_slot(free);
  		vfree(free->arch.slot_phys);
  		free->arch.slot_phys = NULL;
  	}
  }
  
  static int kvmppc_core_create_memslot_hv(struct kvm_memory_slot *slot,
  					 unsigned long npages)
  {
  	slot->arch.rmap = vzalloc(npages * sizeof(*slot->arch.rmap));
  	if (!slot->arch.rmap)
  		return -ENOMEM;
  	slot->arch.slot_phys = NULL;
  
  	return 0;
  }
  
  static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm,
  					struct kvm_memory_slot *memslot,
  					struct kvm_userspace_memory_region *mem)
  {
  	unsigned long *phys;
  
  	/* Allocate a slot_phys array if needed */
  	phys = memslot->arch.slot_phys;
  	if (!kvm->arch.using_mmu_notifiers && !phys && memslot->npages) {
  		phys = vzalloc(memslot->npages * sizeof(unsigned long));
  		if (!phys)
  			return -ENOMEM;
  		memslot->arch.slot_phys = phys;
  	}
  
  	return 0;
  }
  
  static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm,
  				struct kvm_userspace_memory_region *mem,
  				const struct kvm_memory_slot *old)
  {
  	unsigned long npages = mem->memory_size >> PAGE_SHIFT;
  	struct kvm_memory_slot *memslot;
  
  	if (npages && old->npages) {
  		/*
  		 * If modifying a memslot, reset all the rmap dirty bits.
  		 * If this is a new memslot, we don't need to do anything
  		 * since the rmap array starts out as all zeroes,
  		 * i.e. no pages are dirty.
  		 */
  		memslot = id_to_memslot(kvm->memslots, mem->slot);
  		kvmppc_hv_get_dirty_log(kvm, memslot, NULL);
  	}
  }
  
  /*
   * Update LPCR values in kvm->arch and in vcores.
   * Caller must hold kvm->lock.
   */
  void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr, unsigned long mask)
  {
  	long int i;
  	u32 cores_done = 0;
  
  	if ((kvm->arch.lpcr & mask) == lpcr)
  		return;
  
  	kvm->arch.lpcr = (kvm->arch.lpcr & ~mask) | lpcr;
  
  	for (i = 0; i < KVM_MAX_VCORES; ++i) {
  		struct kvmppc_vcore *vc = kvm->arch.vcores[i];
  		if (!vc)
  			continue;
  		spin_lock(&vc->lock);
  		vc->lpcr = (vc->lpcr & ~mask) | lpcr;
  		spin_unlock(&vc->lock);
  		if (++cores_done >= kvm->arch.online_vcores)
  			break;
  	}
  }
  
  static void kvmppc_mmu_destroy_hv(struct kvm_vcpu *vcpu)
  {
  	return;
  }
  
  static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
  {
  	int err = 0;
  	struct kvm *kvm = vcpu->kvm;
  	struct kvm_rma_info *ri = NULL;
  	unsigned long hva;
  	struct kvm_memory_slot *memslot;
  	struct vm_area_struct *vma;
  	unsigned long lpcr = 0, senc;
  	unsigned long lpcr_mask = 0;
  	unsigned long psize, porder;
  	unsigned long rma_size;
  	unsigned long rmls;
  	unsigned long *physp;
  	unsigned long i, npages;
  	int srcu_idx;
  
  	mutex_lock(&kvm->lock);
  	if (kvm->arch.rma_setup_done)
  		goto out;	/* another vcpu beat us to it */
  
  	/* Allocate hashed page table (if not done already) and reset it */
  	if (!kvm->arch.hpt_virt) {
  		err = kvmppc_alloc_hpt(kvm, NULL);
  		if (err) {
  			pr_err("KVM: Couldn't alloc HPT\n");
  			goto out;
  		}
  	}
  
  	/* Look up the memslot for guest physical address 0 */
  	srcu_idx = srcu_read_lock(&kvm->srcu);
  	memslot = gfn_to_memslot(kvm, 0);
  
  	/* We must have some memory at 0 by now */
  	err = -EINVAL;
  	if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
  		goto out_srcu;
  
  	/* Look up the VMA for the start of this memory slot */
  	hva = memslot->userspace_addr;
  	down_read(&current->mm->mmap_sem);
  	vma = find_vma(current->mm, hva);
  	if (!vma || vma->vm_start > hva || (vma->vm_flags & VM_IO))
  		goto up_out;
  
  	psize = vma_kernel_pagesize(vma);
  	porder = __ilog2(psize);
  
  	/* Is this one of our preallocated RMAs? */
  	if (vma->vm_file && vma->vm_file->f_op == &kvm_rma_fops &&
  	    hva == vma->vm_start)
  		ri = vma->vm_file->private_data;
  
  	up_read(&current->mm->mmap_sem);
  
  	if (!ri) {
  		/* On POWER7, use VRMA; on PPC970, give up */
  		err = -EPERM;
  		if (cpu_has_feature(CPU_FTR_ARCH_201)) {
  			pr_err("KVM: CPU requires an RMO\n");
  			goto out_srcu;
  		}
  
  		/* We can handle 4k, 64k or 16M pages in the VRMA */
  		err = -EINVAL;
  		if (!(psize == 0x1000 || psize == 0x10000 ||
  		      psize == 0x1000000))
  			goto out_srcu;
  
  		/* Update VRMASD field in the LPCR */
  		senc = slb_pgsize_encoding(psize);
  		kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T |
  			(VRMA_VSID << SLB_VSID_SHIFT_1T);
  		lpcr_mask = LPCR_VRMASD;
  		/* the -4 is to account for senc values starting at 0x10 */
  		lpcr = senc << (LPCR_VRMASD_SH - 4);
  
  		/* Create HPTEs in the hash page table for the VRMA */
  		kvmppc_map_vrma(vcpu, memslot, porder);
  
  	} else {
  		/* Set up to use an RMO region */
  		rma_size = kvm_rma_pages;
  		if (rma_size > memslot->npages)
  			rma_size = memslot->npages;
  		rma_size <<= PAGE_SHIFT;
  		rmls = lpcr_rmls(rma_size);
  		err = -EINVAL;
  		if ((long)rmls < 0) {
  			pr_err("KVM: Can't use RMA of 0x%lx bytes\n", rma_size);
  			goto out_srcu;
  		}
  		atomic_inc(&ri->use_count);
  		kvm->arch.rma = ri;
  
  		/* Update LPCR and RMOR */
  		if (cpu_has_feature(CPU_FTR_ARCH_201)) {
  			/* PPC970; insert RMLS value (split field) in HID4 */
  			lpcr_mask = (1ul << HID4_RMLS0_SH) |
  				(3ul << HID4_RMLS2_SH) | HID4_RMOR;
  			lpcr = ((rmls >> 2) << HID4_RMLS0_SH) |
  				((rmls & 3) << HID4_RMLS2_SH);
  			/* RMOR is also in HID4 */
  			lpcr |= ((ri->base_pfn >> (26 - PAGE_SHIFT)) & 0xffff)
  				<< HID4_RMOR_SH;
  		} else {
  			/* POWER7 */
  			lpcr_mask = LPCR_VPM0 | LPCR_VRMA_L | LPCR_RMLS;
  			lpcr = rmls << LPCR_RMLS_SH;
  			kvm->arch.rmor = ri->base_pfn << PAGE_SHIFT;
  		}
  		pr_info("KVM: Using RMO at %lx size %lx (LPCR = %lx)\n",
  			ri->base_pfn << PAGE_SHIFT, rma_size, lpcr);
  
  		/* Initialize phys addrs of pages in RMO */
  		npages = kvm_rma_pages;
  		porder = __ilog2(npages);
  		physp = memslot->arch.slot_phys;
  		if (physp) {
  			if (npages > memslot->npages)
  				npages = memslot->npages;
  			spin_lock(&kvm->arch.slot_phys_lock);
  			for (i = 0; i < npages; ++i)
  				physp[i] = ((ri->base_pfn + i) << PAGE_SHIFT) +
  					porder;
  			spin_unlock(&kvm->arch.slot_phys_lock);
  		}
  	}
  
  	kvmppc_update_lpcr(kvm, lpcr, lpcr_mask);
  
  	/* Order updates to kvm->arch.lpcr etc. vs. rma_setup_done */
  	smp_wmb();
  	kvm->arch.rma_setup_done = 1;
  	err = 0;
   out_srcu:
  	srcu_read_unlock(&kvm->srcu, srcu_idx);
   out:
  	mutex_unlock(&kvm->lock);
  	return err;
  
   up_out:
  	up_read(&current->mm->mmap_sem);
  	goto out_srcu;
  }
  
  static int kvmppc_core_init_vm_hv(struct kvm *kvm)
  {
  	unsigned long lpcr, lpid;
  
  	/* Allocate the guest's logical partition ID */
  
  	lpid = kvmppc_alloc_lpid();
  	if ((long)lpid < 0)
  		return -ENOMEM;
  	kvm->arch.lpid = lpid;
  
  	/*
  	 * Since we don't flush the TLB when tearing down a VM,
  	 * and this lpid might have previously been used,
  	 * make sure we flush on each core before running the new VM.
  	 */
  	cpumask_setall(&kvm->arch.need_tlb_flush);
  
  	/* Start out with the default set of hcalls enabled */
  	memcpy(kvm->arch.enabled_hcalls, default_enabled_hcalls,
  	       sizeof(kvm->arch.enabled_hcalls));
  
  	kvm->arch.rma = NULL;
  
  	kvm->arch.host_sdr1 = mfspr(SPRN_SDR1);
  
  	if (cpu_has_feature(CPU_FTR_ARCH_201)) {
  		/* PPC970; HID4 is effectively the LPCR */
  		kvm->arch.host_lpid = 0;
  		kvm->arch.host_lpcr = lpcr = mfspr(SPRN_HID4);
  		lpcr &= ~((3 << HID4_LPID1_SH) | (0xful << HID4_LPID5_SH));
  		lpcr |= ((lpid >> 4) << HID4_LPID1_SH) |
  			((lpid & 0xf) << HID4_LPID5_SH);
  	} else {
  		/* POWER7; init LPCR for virtual RMA mode */
  		kvm->arch.host_lpid = mfspr(SPRN_LPID);
  		kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR);
  		lpcr &= LPCR_PECE | LPCR_LPES;
  		lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE |
  			LPCR_VPM0 | LPCR_VPM1;
  		kvm->arch.vrma_slb_v = SLB_VSID_B_1T |
  			(VRMA_VSID << SLB_VSID_SHIFT_1T);
  		/* On POWER8 turn on online bit to enable PURR/SPURR */
  		if (cpu_has_feature(CPU_FTR_ARCH_207S))
  			lpcr |= LPCR_ONL;
  	}
  	kvm->arch.lpcr = lpcr;
  
  	kvm->arch.using_mmu_notifiers = !!cpu_has_feature(CPU_FTR_ARCH_206);
  	spin_lock_init(&kvm->arch.slot_phys_lock);
  
  	/*
  	 * Track that we now have a HV mode VM active. This blocks secondary
  	 * CPU threads from coming online.
  	 */
  	kvm_hv_vm_activated();
  
  	return 0;
  }
  
  static void kvmppc_free_vcores(struct kvm *kvm)
  {
  	long int i;
  
  	for (i = 0; i < KVM_MAX_VCORES; ++i) {
  		if (kvm->arch.vcores[i] && kvm->arch.vcores[i]->mpp_buffer) {
  			struct kvmppc_vcore *vc = kvm->arch.vcores[i];
  			free_pages((unsigned long)vc->mpp_buffer,
  				   MPP_BUFFER_ORDER);
  		}
  		kfree(kvm->arch.vcores[i]);
  	}
  	kvm->arch.online_vcores = 0;
  }
  
  static void kvmppc_core_destroy_vm_hv(struct kvm *kvm)
  {
  	kvm_hv_vm_deactivated();
  
  	kvmppc_free_vcores(kvm);
  	if (kvm->arch.rma) {
  		kvm_release_rma(kvm->arch.rma);
  		kvm->arch.rma = NULL;
  	}
  
  	kvmppc_free_hpt(kvm);
  }
  
  /* We don't need to emulate any privileged instructions or dcbz */
  static int kvmppc_core_emulate_op_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
  				     unsigned int inst, int *advance)
  {
  	return EMULATE_FAIL;
  }
  
  static int kvmppc_core_emulate_mtspr_hv(struct kvm_vcpu *vcpu, int sprn,
  					ulong spr_val)
  {
  	return EMULATE_FAIL;
  }
  
  static int kvmppc_core_emulate_mfspr_hv(struct kvm_vcpu *vcpu, int sprn,
  					ulong *spr_val)
  {
  	return EMULATE_FAIL;
  }
  
  static int kvmppc_core_check_processor_compat_hv(void)
  {
  	if (!cpu_has_feature(CPU_FTR_HVMODE))
  		return -EIO;
  	return 0;
  }
  
  static long kvm_arch_vm_ioctl_hv(struct file *filp,
  				 unsigned int ioctl, unsigned long arg)
  {
  	struct kvm *kvm __maybe_unused = filp->private_data;
  	void __user *argp = (void __user *)arg;
  	long r;
  
  	switch (ioctl) {
  
  	case KVM_ALLOCATE_RMA: {
  		struct kvm_allocate_rma rma;
  		struct kvm *kvm = filp->private_data;
  
  		r = kvm_vm_ioctl_allocate_rma(kvm, &rma);
  		if (r >= 0 && copy_to_user(argp, &rma, sizeof(rma)))
  			r = -EFAULT;
  		break;
  	}
  
  	case KVM_PPC_ALLOCATE_HTAB: {
  		u32 htab_order;
  
  		r = -EFAULT;
  		if (get_user(htab_order, (u32 __user *)argp))
  			break;
  		r = kvmppc_alloc_reset_hpt(kvm, &htab_order);
  		if (r)
  			break;
  		r = -EFAULT;
  		if (put_user(htab_order, (u32 __user *)argp))
  			break;
  		r = 0;
  		break;
  	}
  
  	case KVM_PPC_GET_HTAB_FD: {
  		struct kvm_get_htab_fd ghf;
  
  		r = -EFAULT;
  		if (copy_from_user(&ghf, argp, sizeof(ghf)))
  			break;
  		r = kvm_vm_ioctl_get_htab_fd(kvm, &ghf);
  		break;
  	}
  
  	default:
  		r = -ENOTTY;
  	}
  
  	return r;
  }
  
  /*
   * List of hcall numbers to enable by default.
   * For compatibility with old userspace, we enable by default
   * all hcalls that were implemented before the hcall-enabling
   * facility was added.  Note this list should not include H_RTAS.
   */
  static unsigned int default_hcall_list[] = {
  	H_REMOVE,
  	H_ENTER,
  	H_READ,
  	H_PROTECT,
  	H_BULK_REMOVE,
  	H_GET_TCE,
  	H_PUT_TCE,
  	H_SET_DABR,
  	H_SET_XDABR,
  	H_CEDE,
  	H_PROD,
  	H_CONFER,
  	H_REGISTER_VPA,
  #ifdef CONFIG_KVM_XICS
  	H_EOI,
  	H_CPPR,
  	H_IPI,
  	H_IPOLL,
  	H_XIRR,
  	H_XIRR_X,
  #endif
  	0
  };
  
  static void init_default_hcalls(void)
  {
  	int i;
  	unsigned int hcall;
  
  	for (i = 0; default_hcall_list[i]; ++i) {
  		hcall = default_hcall_list[i];
  		WARN_ON(!kvmppc_hcall_impl_hv(hcall));
  		__set_bit(hcall / 4, default_enabled_hcalls);
  	}
  }
  
  static struct kvmppc_ops kvm_ops_hv = {
  	.get_sregs = kvm_arch_vcpu_ioctl_get_sregs_hv,
  	.set_sregs = kvm_arch_vcpu_ioctl_set_sregs_hv,
  	.get_one_reg = kvmppc_get_one_reg_hv,
  	.set_one_reg = kvmppc_set_one_reg_hv,
  	.vcpu_load   = kvmppc_core_vcpu_load_hv,
  	.vcpu_put    = kvmppc_core_vcpu_put_hv,
  	.set_msr     = kvmppc_set_msr_hv,
  	.vcpu_run    = kvmppc_vcpu_run_hv,
  	.vcpu_create = kvmppc_core_vcpu_create_hv,
  	.vcpu_free   = kvmppc_core_vcpu_free_hv,
  	.check_requests = kvmppc_core_check_requests_hv,
  	.get_dirty_log  = kvm_vm_ioctl_get_dirty_log_hv,
  	.flush_memslot  = kvmppc_core_flush_memslot_hv,
  	.prepare_memory_region = kvmppc_core_prepare_memory_region_hv,
  	.commit_memory_region  = kvmppc_core_commit_memory_region_hv,
  	.unmap_hva = kvm_unmap_hva_hv,
  	.unmap_hva_range = kvm_unmap_hva_range_hv,
  	.age_hva  = kvm_age_hva_hv,
  	.test_age_hva = kvm_test_age_hva_hv,
  	.set_spte_hva = kvm_set_spte_hva_hv,
  	.mmu_destroy  = kvmppc_mmu_destroy_hv,
  	.free_memslot = kvmppc_core_free_memslot_hv,
  	.create_memslot = kvmppc_core_create_memslot_hv,
  	.init_vm =  kvmppc_core_init_vm_hv,
  	.destroy_vm = kvmppc_core_destroy_vm_hv,
  	.get_smmu_info = kvm_vm_ioctl_get_smmu_info_hv,
  	.emulate_op = kvmppc_core_emulate_op_hv,
  	.emulate_mtspr = kvmppc_core_emulate_mtspr_hv,
  	.emulate_mfspr = kvmppc_core_emulate_mfspr_hv,
  	.fast_vcpu_kick = kvmppc_fast_vcpu_kick_hv,
  	.arch_vm_ioctl  = kvm_arch_vm_ioctl_hv,
  	.hcall_implemented = kvmppc_hcall_impl_hv,
  };
  
  static int kvmppc_book3s_init_hv(void)
  {
  	int r;
  	/*
  	 * FIXME!! Do we need to check on all cpus ?
  	 */
  	r = kvmppc_core_check_processor_compat_hv();
  	if (r < 0)
  		return -ENODEV;
  
  	kvm_ops_hv.owner = THIS_MODULE;
  	kvmppc_hv_ops = &kvm_ops_hv;
  
  	init_default_hcalls();
  
  	r = kvmppc_mmu_hv_init();
  	return r;
  }
  
  static void kvmppc_book3s_exit_hv(void)
  {
  	kvmppc_hv_ops = NULL;
  }
  
  module_init(kvmppc_book3s_init_hv);
  module_exit(kvmppc_book3s_exit_hv);
  MODULE_LICENSE("GPL");
  MODULE_ALIAS_MISCDEV(KVM_MINOR);
  MODULE_ALIAS("devname:kvm");
  