arch/powerpc/kvm/book3s_hv_rm_mmu.c - kernel/msm-4.9 - Gitiles

 /*
  * 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.
  *
  * Copyright 2010-2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
  */

 #include <linux/types.h>
 #include <linux/string.h>
 #include <linux/kvm.h>
 #include <linux/kvm_host.h>
 #include <linux/hugetlb.h>
 #include <linux/module.h>

 #include <asm/tlbflush.h>
 #include <asm/kvm_ppc.h>
 #include <asm/kvm_book3s.h>
 #include <asm/mmu-hash64.h>
 #include <asm/hvcall.h>
 #include <asm/synch.h>
 #include <asm/ppc-opcode.h>

 /*
  * Since this file is built in even if KVM is a module, we need
  * a local copy of this function for the case where kvm_main.c is
  * modular.
  */
 static struct kvm_memory_slot *builtin_gfn_to_memslot(struct kvm *kvm,
 						gfn_t gfn)
 {
 	struct kvm_memslots *slots;
 	struct kvm_memory_slot *memslot;

 	slots = kvm_memslots(kvm);
 	kvm_for_each_memslot(memslot, slots)
 		if (gfn >= memslot->base_gfn &&
 		      gfn < memslot->base_gfn + memslot->npages)
 			return memslot;
 	return NULL;
 }

 /* Translate address of a vmalloc'd thing to a linear map address */
 static void *real_vmalloc_addr(void *x)
 {
 	unsigned long addr = (unsigned long) x;
 	pte_t *p;

 	p = find_linux_pte(swapper_pg_dir, addr);
 	if (!p || !pte_present(*p))
 		return NULL;
 	/* assume we don't have huge pages in vmalloc space... */
 	addr = (pte_pfn(*p) << PAGE_SHIFT) | (addr & ~PAGE_MASK);
 	return __va(addr);
 }

 long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags,
 		    long pte_index, unsigned long pteh, unsigned long ptel)
 {
 	struct kvm *kvm = vcpu->kvm;
 	unsigned long i, pa, gpa, gfn, psize;
 	unsigned long slot_fn;
 	unsigned long *hpte;
 	struct revmap_entry *rev;
 	unsigned long g_ptel = ptel;
 	struct kvm_memory_slot *memslot;
 	unsigned long *physp, pte_size;
 	bool realmode = vcpu->arch.vcore->vcore_state == VCORE_RUNNING;

 	psize = hpte_page_size(pteh, ptel);
 	if (!psize)
 		return H_PARAMETER;

 	/* Find the memslot (if any) for this address */
 	gpa = (ptel & HPTE_R_RPN) & ~(psize - 1);
 	gfn = gpa >> PAGE_SHIFT;
 	memslot = builtin_gfn_to_memslot(kvm, gfn);
 	if (!(memslot && !(memslot->flags & KVM_MEMSLOT_INVALID)))
 		return H_PARAMETER;

 	/* Check if the requested page fits entirely in the memslot. */
 	if (!slot_is_aligned(memslot, psize))
 		return H_PARAMETER;
 	slot_fn = gfn - memslot->base_gfn;

 	physp = kvm->arch.slot_phys[memslot->id];
 	if (!physp)
 		return H_PARAMETER;
 	physp += slot_fn;
 	if (realmode)
 		physp = real_vmalloc_addr(physp);
 	pa = *physp;
 	if (!pa)
 		return H_TOO_HARD;
 	pte_size = PAGE_SIZE << (pa & KVMPPC_PAGE_ORDER_MASK);
 	pa &= PAGE_MASK;

 	if (pte_size < psize)
 		return H_PARAMETER;
 	if (pa && pte_size > psize)
 		pa |= gpa & (pte_size - 1);

 	ptel &= ~(HPTE_R_PP0 - psize);
 	ptel |= pa;

 	/* Check WIMG */
 	if ((ptel & HPTE_R_WIMG) != HPTE_R_M &&
 	    (ptel & HPTE_R_WIMG) != (HPTE_R_W | HPTE_R_I | HPTE_R_M))
 		return H_PARAMETER;
 	pteh &= ~0x60UL;
 	pteh |= HPTE_V_VALID;

 	if (pte_index >= HPT_NPTE)
 		return H_PARAMETER;
 	if (likely((flags & H_EXACT) == 0)) {
 		pte_index &= ~7UL;
 		hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
 		for (i = 0; i < 8; ++i) {
 			if ((*hpte & HPTE_V_VALID) == 0 &&
 			    try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID))
 				break;
 			hpte += 2;
 		}
 		if (i == 8) {
 			/*
 			 * Since try_lock_hpte doesn't retry (not even stdcx.
 			 * failures), it could be that there is a free slot
 			 * but we transiently failed to lock it.  Try again,
 			 * actually locking each slot and checking it.
 			 */
 			hpte -= 16;
 			for (i = 0; i < 8; ++i) {
 				while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
 					cpu_relax();
 				if ((*hpte & HPTE_V_VALID) == 0)
 					break;
 				*hpte &= ~HPTE_V_HVLOCK;
 				hpte += 2;
 			}
 			if (i == 8)
 				return H_PTEG_FULL;
 		}
 		pte_index += i;
 	} else {
 		hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
 		if (!try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID)) {
 			/* Lock the slot and check again */
 			while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
 				cpu_relax();
 			if (*hpte & HPTE_V_VALID) {
 				*hpte &= ~HPTE_V_HVLOCK;
 				return H_PTEG_FULL;
 			}
 		}
 	}

 	/* Save away the guest's idea of the second HPTE dword */
 	rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]);
 	if (rev)
 		rev->guest_rpte = g_ptel;
 	hpte[1] = ptel;
 	eieio();
 	hpte[0] = pteh;
 	asm volatile("ptesync" : : : "memory");
 	vcpu->arch.gpr[4] = pte_index;
 	return H_SUCCESS;
 }
 EXPORT_SYMBOL_GPL(kvmppc_h_enter);

 #define LOCK_TOKEN	(*(u32 *)(&get_paca()->lock_token))

 static inline int try_lock_tlbie(unsigned int *lock)
 {
 	unsigned int tmp, old;
 	unsigned int token = LOCK_TOKEN;

 	asm volatile("1:lwarx	%1,0,%2\n"
 		     "	cmpwi	cr0,%1,0\n"
 		     "	bne	2f\n"
 		     "  stwcx.	%3,0,%2\n"
 		     "	bne-	1b\n"
 		     "  isync\n"
 		     "2:"
 		     : "=&r" (tmp), "=&r" (old)
 		     : "r" (lock), "r" (token)
 		     : "cc", "memory");
 	return old == 0;
 }

 long kvmppc_h_remove(struct kvm_vcpu *vcpu, unsigned long flags,
 		     unsigned long pte_index, unsigned long avpn,
 		     unsigned long va)
 {
 	struct kvm *kvm = vcpu->kvm;
 	unsigned long *hpte;
 	unsigned long v, r, rb;

 	if (pte_index >= HPT_NPTE)
 		return H_PARAMETER;
 	hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
 	while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
 		cpu_relax();
 	if ((hpte[0] & HPTE_V_VALID) == 0 ||
 	    ((flags & H_AVPN) && (hpte[0] & ~0x7fUL) != avpn) ||
 	    ((flags & H_ANDCOND) && (hpte[0] & avpn) != 0)) {
 		hpte[0] &= ~HPTE_V_HVLOCK;
 		return H_NOT_FOUND;
 	}
 	if (atomic_read(&kvm->online_vcpus) == 1)
 		flags |= H_LOCAL;
 	vcpu->arch.gpr[4] = v = hpte[0] & ~HPTE_V_HVLOCK;
 	vcpu->arch.gpr[5] = r = hpte[1];
 	rb = compute_tlbie_rb(v, r, pte_index);
 	hpte[0] = 0;
 	if (!(flags & H_LOCAL)) {
 		while(!try_lock_tlbie(&kvm->arch.tlbie_lock))
 			cpu_relax();
 		asm volatile("ptesync" : : : "memory");
 		asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync"
 			     : : "r" (rb), "r" (kvm->arch.lpid));
 		asm volatile("ptesync" : : : "memory");
 		kvm->arch.tlbie_lock = 0;
 	} else {
 		asm volatile("ptesync" : : : "memory");
 		asm volatile("tlbiel %0" : : "r" (rb));
 		asm volatile("ptesync" : : : "memory");
 	}
 	return H_SUCCESS;
 }

 long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu)
 {
 	struct kvm *kvm = vcpu->kvm;
 	unsigned long *args = &vcpu->arch.gpr[4];
 	unsigned long *hp, tlbrb[4];
 	long int i, found;
 	long int n_inval = 0;
 	unsigned long flags, req, pte_index;
 	long int local = 0;
 	long int ret = H_SUCCESS;

 	if (atomic_read(&kvm->online_vcpus) == 1)
 		local = 1;
 	for (i = 0; i < 4; ++i) {
 		pte_index = args[i * 2];
 		flags = pte_index >> 56;
 		pte_index &= ((1ul << 56) - 1);
 		req = flags >> 6;
 		flags &= 3;
 		if (req == 3)
 			break;
 		if (req != 1 || flags == 3 ||
 		    pte_index >= HPT_NPTE) {
 			/* parameter error */
 			args[i * 2] = ((0xa0 | flags) << 56) + pte_index;
 			ret = H_PARAMETER;
 			break;
 		}
 		hp = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
 		while (!try_lock_hpte(hp, HPTE_V_HVLOCK))
 			cpu_relax();
 		found = 0;
 		if (hp[0] & HPTE_V_VALID) {
 			switch (flags & 3) {
 			case 0:		/* absolute */
 				found = 1;
 				break;
 			case 1:		/* andcond */
 				if (!(hp[0] & args[i * 2 + 1]))
 					found = 1;
 				break;
 			case 2:		/* AVPN */
 				if ((hp[0] & ~0x7fUL) == args[i * 2 + 1])
 					found = 1;
 				break;
 			}
 		}
 		if (!found) {
 			hp[0] &= ~HPTE_V_HVLOCK;
 			args[i * 2] = ((0x90 | flags) << 56) + pte_index;
 			continue;
 		}
 		/* insert R and C bits from PTE */
 		flags |= (hp[1] >> 5) & 0x0c;
 		args[i * 2] = ((0x80 | flags) << 56) + pte_index;
 		tlbrb[n_inval++] = compute_tlbie_rb(hp[0], hp[1], pte_index);
 		hp[0] = 0;
 	}
 	if (n_inval == 0)
 		return ret;

 	if (!local) {
 		while(!try_lock_tlbie(&kvm->arch.tlbie_lock))
 			cpu_relax();
 		asm volatile("ptesync" : : : "memory");
 		for (i = 0; i < n_inval; ++i)
 			asm volatile(PPC_TLBIE(%1,%0)
 				     : : "r" (tlbrb[i]), "r" (kvm->arch.lpid));
 		asm volatile("eieio; tlbsync; ptesync" : : : "memory");
 		kvm->arch.tlbie_lock = 0;
 	} else {
 		asm volatile("ptesync" : : : "memory");
 		for (i = 0; i < n_inval; ++i)
 			asm volatile("tlbiel %0" : : "r" (tlbrb[i]));
 		asm volatile("ptesync" : : : "memory");
 	}
 	return ret;
 }

 long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags,
 		      unsigned long pte_index, unsigned long avpn,
 		      unsigned long va)
 {
 	struct kvm *kvm = vcpu->kvm;
 	unsigned long *hpte;
 	struct revmap_entry *rev;
 	unsigned long v, r, rb, mask, bits;

 	if (pte_index >= HPT_NPTE)
 		return H_PARAMETER;
 	hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
 	while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
 		cpu_relax();
 	if ((hpte[0] & HPTE_V_VALID) == 0 ||
 	    ((flags & H_AVPN) && (hpte[0] & ~0x7fUL) != avpn)) {
 		hpte[0] &= ~HPTE_V_HVLOCK;
 		return H_NOT_FOUND;
 	}
 	if (atomic_read(&kvm->online_vcpus) == 1)
 		flags |= H_LOCAL;
 	v = hpte[0];
 	bits = (flags << 55) & HPTE_R_PP0;
 	bits |= (flags << 48) & HPTE_R_KEY_HI;
 	bits |= flags & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO);

 	/* Update guest view of 2nd HPTE dword */
 	mask = HPTE_R_PP0 | HPTE_R_PP | HPTE_R_N |
 		HPTE_R_KEY_HI | HPTE_R_KEY_LO;
 	rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]);
 	if (rev) {
 		r = (rev->guest_rpte & ~mask) | bits;
 		rev->guest_rpte = r;
 	}
 	r = (hpte[1] & ~mask) | bits;

 	/* Update HPTE */
 	rb = compute_tlbie_rb(v, r, pte_index);
 	hpte[0] = v & ~HPTE_V_VALID;
 	if (!(flags & H_LOCAL)) {
 		while(!try_lock_tlbie(&kvm->arch.tlbie_lock))
 			cpu_relax();
 		asm volatile("ptesync" : : : "memory");
 		asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync"
 			     : : "r" (rb), "r" (kvm->arch.lpid));
 		asm volatile("ptesync" : : : "memory");
 		kvm->arch.tlbie_lock = 0;
 	} else {
 		asm volatile("ptesync" : : : "memory");
 		asm volatile("tlbiel %0" : : "r" (rb));
 		asm volatile("ptesync" : : : "memory");
 	}
 	hpte[1] = r;
 	eieio();
 	hpte[0] = v & ~HPTE_V_HVLOCK;
 	asm volatile("ptesync" : : : "memory");
 	return H_SUCCESS;
 }

 long kvmppc_h_read(struct kvm_vcpu *vcpu, unsigned long flags,
 		   unsigned long pte_index)
 {
 	struct kvm *kvm = vcpu->kvm;
 	unsigned long *hpte, r;
 	int i, n = 1;
 	struct revmap_entry *rev = NULL;

 	if (pte_index >= HPT_NPTE)
 		return H_PARAMETER;
 	if (flags & H_READ_4) {
 		pte_index &= ~3;
 		n = 4;
 	}
 	if (flags & H_R_XLATE)
 		rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]);
 	for (i = 0; i < n; ++i, ++pte_index) {
 		hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
 		r = hpte[1];
 		if (hpte[0] & HPTE_V_VALID) {
 			if (rev)
 				r = rev[i].guest_rpte;
 			else
 				r = hpte[1] | HPTE_R_RPN;
 		}
 		vcpu->arch.gpr[4 + i * 2] = hpte[0];
 		vcpu->arch.gpr[5 + i * 2] = r;
 	}
 	return H_SUCCESS;
 }
	/*
	* 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.
	*
	* Copyright 2010-2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
	*/

	#include <linux/types.h>
	#include <linux/string.h>
	#include <linux/kvm.h>
	#include <linux/kvm_host.h>
	#include <linux/hugetlb.h>
	#include <linux/module.h>

	#include <asm/tlbflush.h>
	#include <asm/kvm_ppc.h>
	#include <asm/kvm_book3s.h>
	#include <asm/mmu-hash64.h>
	#include <asm/hvcall.h>
	#include <asm/synch.h>
	#include <asm/ppc-opcode.h>

	/*
	* Since this file is built in even if KVM is a module, we need
	* a local copy of this function for the case where kvm_main.c is
	* modular.
	*/
	static struct kvm_memory_slot builtin_gfn_to_memslot(struct kvm kvm,
	gfn_t gfn)
	{
	struct kvm_memslots *slots;
	struct kvm_memory_slot *memslot;

	slots = kvm_memslots(kvm);
	kvm_for_each_memslot(memslot, slots)
	if (gfn >= memslot->base_gfn &&
	gfn < memslot->base_gfn + memslot->npages)
	return memslot;
	return NULL;
	}

	/* Translate address of a vmalloc'd thing to a linear map address */
	static void real_vmalloc_addr(void x)
	{
	unsigned long addr = (unsigned long) x;
	pte_t *p;

	p = find_linux_pte(swapper_pg_dir, addr);
	if (!p \|\| !pte_present(*p))
	return NULL;
	/* assume we don't have huge pages in vmalloc space... */
	addr = (pte_pfn(*p) << PAGE_SHIFT) \| (addr & ~PAGE_MASK);
	return __va(addr);
	}

	long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags,
	long pte_index, unsigned long pteh, unsigned long ptel)
	{
	struct kvm *kvm = vcpu->kvm;
	unsigned long i, pa, gpa, gfn, psize;
	unsigned long slot_fn;
	unsigned long *hpte;
	struct revmap_entry *rev;
	unsigned long g_ptel = ptel;
	struct kvm_memory_slot *memslot;
	unsigned long *physp, pte_size;
	bool realmode = vcpu->arch.vcore->vcore_state == VCORE_RUNNING;

	psize = hpte_page_size(pteh, ptel);
	if (!psize)
	return H_PARAMETER;

	/* Find the memslot (if any) for this address */
	gpa = (ptel & HPTE_R_RPN) & ~(psize - 1);
	gfn = gpa >> PAGE_SHIFT;
	memslot = builtin_gfn_to_memslot(kvm, gfn);
	if (!(memslot && !(memslot->flags & KVM_MEMSLOT_INVALID)))
	return H_PARAMETER;

	/* Check if the requested page fits entirely in the memslot. */
	if (!slot_is_aligned(memslot, psize))
	return H_PARAMETER;
	slot_fn = gfn - memslot->base_gfn;

	physp = kvm->arch.slot_phys[memslot->id];
	if (!physp)
	return H_PARAMETER;
	physp += slot_fn;
	if (realmode)
	physp = real_vmalloc_addr(physp);
	pa = *physp;
	if (!pa)
	return H_TOO_HARD;
	pte_size = PAGE_SIZE << (pa & KVMPPC_PAGE_ORDER_MASK);
	pa &= PAGE_MASK;

	if (pte_size < psize)
	return H_PARAMETER;
	if (pa && pte_size > psize)
	pa \|= gpa & (pte_size - 1);

	ptel &= ~(HPTE_R_PP0 - psize);
	ptel \|= pa;

	/* Check WIMG */
	if ((ptel & HPTE_R_WIMG) != HPTE_R_M &&
	(ptel & HPTE_R_WIMG) != (HPTE_R_W \| HPTE_R_I \| HPTE_R_M))
	return H_PARAMETER;
	pteh &= ~0x60UL;
	pteh \|= HPTE_V_VALID;

	if (pte_index >= HPT_NPTE)
	return H_PARAMETER;
	if (likely((flags & H_EXACT) == 0)) {
	pte_index &= ~7UL;
	hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
	for (i = 0; i < 8; ++i) {
	if ((*hpte & HPTE_V_VALID) == 0 &&
	try_lock_hpte(hpte, HPTE_V_HVLOCK \| HPTE_V_VALID))
	break;
	hpte += 2;
	}
	if (i == 8) {
	/*
	* Since try_lock_hpte doesn't retry (not even stdcx.
	* failures), it could be that there is a free slot
	* but we transiently failed to lock it. Try again,
	* actually locking each slot and checking it.
	*/
	hpte -= 16;
	for (i = 0; i < 8; ++i) {
	while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
	cpu_relax();
	if ((*hpte & HPTE_V_VALID) == 0)
	break;
	*hpte &= ~HPTE_V_HVLOCK;
	hpte += 2;
	}
	if (i == 8)
	return H_PTEG_FULL;
	}
	pte_index += i;
	} else {
	hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
	if (!try_lock_hpte(hpte, HPTE_V_HVLOCK \| HPTE_V_VALID)) {
	/* Lock the slot and check again */
	while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
	cpu_relax();
	if (*hpte & HPTE_V_VALID) {
	*hpte &= ~HPTE_V_HVLOCK;
	return H_PTEG_FULL;
	}
	}
	}

	/* Save away the guest's idea of the second HPTE dword */
	rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]);
	if (rev)
	rev->guest_rpte = g_ptel;
	hpte[1] = ptel;
	eieio();
	hpte[0] = pteh;
	asm volatile("ptesync" : : : "memory");
	vcpu->arch.gpr[4] = pte_index;
	return H_SUCCESS;
	}
	EXPORT_SYMBOL_GPL(kvmppc_h_enter);

	#define LOCK_TOKEN ((u32 )(&get_paca()->lock_token))

	static inline int try_lock_tlbie(unsigned int *lock)
	{
	unsigned int tmp, old;
	unsigned int token = LOCK_TOKEN;

	asm volatile("1:lwarx %1,0,%2\n"
	" cmpwi cr0,%1,0\n"
	" bne 2f\n"
	" stwcx. %3,0,%2\n"
	" bne- 1b\n"
	" isync\n"
	"2:"
	: "=&r" (tmp), "=&r" (old)
	: "r" (lock), "r" (token)
	: "cc", "memory");
	return old == 0;
	}

	long kvmppc_h_remove(struct kvm_vcpu *vcpu, unsigned long flags,
	unsigned long pte_index, unsigned long avpn,
	unsigned long va)
	{
	struct kvm *kvm = vcpu->kvm;
	unsigned long *hpte;
	unsigned long v, r, rb;

	if (pte_index >= HPT_NPTE)
	return H_PARAMETER;
	hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
	while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
	cpu_relax();
	if ((hpte[0] & HPTE_V_VALID) == 0 \|\|
	((flags & H_AVPN) && (hpte[0] & ~0x7fUL) != avpn) \|\|
	((flags & H_ANDCOND) && (hpte[0] & avpn) != 0)) {
	hpte[0] &= ~HPTE_V_HVLOCK;
	return H_NOT_FOUND;
	}
	if (atomic_read(&kvm->online_vcpus) == 1)
	flags \|= H_LOCAL;
	vcpu->arch.gpr[4] = v = hpte[0] & ~HPTE_V_HVLOCK;
	vcpu->arch.gpr[5] = r = hpte[1];
	rb = compute_tlbie_rb(v, r, pte_index);
	hpte[0] = 0;
	if (!(flags & H_LOCAL)) {
	while(!try_lock_tlbie(&kvm->arch.tlbie_lock))
	cpu_relax();
	asm volatile("ptesync" : : : "memory");
	asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync"
	: : "r" (rb), "r" (kvm->arch.lpid));
	asm volatile("ptesync" : : : "memory");
	kvm->arch.tlbie_lock = 0;
	} else {
	asm volatile("ptesync" : : : "memory");
	asm volatile("tlbiel %0" : : "r" (rb));
	asm volatile("ptesync" : : : "memory");
	}
	return H_SUCCESS;
	}

	long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu)
	{
	struct kvm *kvm = vcpu->kvm;
	unsigned long *args = &vcpu->arch.gpr[4];
	unsigned long *hp, tlbrb[4];
	long int i, found;
	long int n_inval = 0;
	unsigned long flags, req, pte_index;
	long int local = 0;
	long int ret = H_SUCCESS;

	if (atomic_read(&kvm->online_vcpus) == 1)
	local = 1;
	for (i = 0; i < 4; ++i) {
	pte_index = args[i * 2];
	flags = pte_index >> 56;
	pte_index &= ((1ul << 56) - 1);
	req = flags >> 6;
	flags &= 3;
	if (req == 3)
	break;
	if (req != 1 \|\| flags == 3 \|\|
	pte_index >= HPT_NPTE) {
	/* parameter error */
	args[i * 2] = ((0xa0 \| flags) << 56) + pte_index;
	ret = H_PARAMETER;
	break;
	}
	hp = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
	while (!try_lock_hpte(hp, HPTE_V_HVLOCK))
	cpu_relax();
	found = 0;
	if (hp[0] & HPTE_V_VALID) {
	switch (flags & 3) {
	case 0: /* absolute */
	found = 1;
	break;
	case 1: /* andcond */
	if (!(hp[0] & args[i * 2 + 1]))
	found = 1;
	break;
	case 2: /* AVPN */
	if ((hp[0] & ~0x7fUL) == args[i * 2 + 1])
	found = 1;
	break;
	}
	}
	if (!found) {
	hp[0] &= ~HPTE_V_HVLOCK;
	args[i * 2] = ((0x90 \| flags) << 56) + pte_index;
	continue;
	}
	/* insert R and C bits from PTE */
	flags \|= (hp[1] >> 5) & 0x0c;
	args[i * 2] = ((0x80 \| flags) << 56) + pte_index;
	tlbrb[n_inval++] = compute_tlbie_rb(hp[0], hp[1], pte_index);
	hp[0] = 0;
	}
	if (n_inval == 0)
	return ret;

	if (!local) {
	while(!try_lock_tlbie(&kvm->arch.tlbie_lock))
	cpu_relax();
	asm volatile("ptesync" : : : "memory");
	for (i = 0; i < n_inval; ++i)
	asm volatile(PPC_TLBIE(%1,%0)
	: : "r" (tlbrb[i]), "r" (kvm->arch.lpid));
	asm volatile("eieio; tlbsync; ptesync" : : : "memory");
	kvm->arch.tlbie_lock = 0;
	} else {
	asm volatile("ptesync" : : : "memory");
	for (i = 0; i < n_inval; ++i)
	asm volatile("tlbiel %0" : : "r" (tlbrb[i]));
	asm volatile("ptesync" : : : "memory");
	}
	return ret;
	}

	long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags,
	unsigned long pte_index, unsigned long avpn,
	unsigned long va)
	{
	struct kvm *kvm = vcpu->kvm;
	unsigned long *hpte;
	struct revmap_entry *rev;
	unsigned long v, r, rb, mask, bits;

	if (pte_index >= HPT_NPTE)
	return H_PARAMETER;
	hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
	while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
	cpu_relax();
	if ((hpte[0] & HPTE_V_VALID) == 0 \|\|
	((flags & H_AVPN) && (hpte[0] & ~0x7fUL) != avpn)) {
	hpte[0] &= ~HPTE_V_HVLOCK;
	return H_NOT_FOUND;
	}
	if (atomic_read(&kvm->online_vcpus) == 1)
	flags \|= H_LOCAL;
	v = hpte[0];
	bits = (flags << 55) & HPTE_R_PP0;
	bits \|= (flags << 48) & HPTE_R_KEY_HI;
	bits \|= flags & (HPTE_R_PP \| HPTE_R_N \| HPTE_R_KEY_LO);

	/* Update guest view of 2nd HPTE dword */
	mask = HPTE_R_PP0 \| HPTE_R_PP \| HPTE_R_N \|
	HPTE_R_KEY_HI \| HPTE_R_KEY_LO;
	rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]);
	if (rev) {
	r = (rev->guest_rpte & ~mask) \| bits;
	rev->guest_rpte = r;
	}
	r = (hpte[1] & ~mask) \| bits;

	/* Update HPTE */
	rb = compute_tlbie_rb(v, r, pte_index);
	hpte[0] = v & ~HPTE_V_VALID;
	if (!(flags & H_LOCAL)) {
	while(!try_lock_tlbie(&kvm->arch.tlbie_lock))
	cpu_relax();
	asm volatile("ptesync" : : : "memory");
	asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync"
	: : "r" (rb), "r" (kvm->arch.lpid));
	asm volatile("ptesync" : : : "memory");
	kvm->arch.tlbie_lock = 0;
	} else {
	asm volatile("ptesync" : : : "memory");
	asm volatile("tlbiel %0" : : "r" (rb));
	asm volatile("ptesync" : : : "memory");
	}
	hpte[1] = r;
	eieio();
	hpte[0] = v & ~HPTE_V_HVLOCK;
	asm volatile("ptesync" : : : "memory");
	return H_SUCCESS;
	}

	long kvmppc_h_read(struct kvm_vcpu *vcpu, unsigned long flags,
	unsigned long pte_index)
	{
	struct kvm *kvm = vcpu->kvm;
	unsigned long *hpte, r;
	int i, n = 1;
	struct revmap_entry *rev = NULL;

	if (pte_index >= HPT_NPTE)
	return H_PARAMETER;
	if (flags & H_READ_4) {
	pte_index &= ~3;
	n = 4;
	}
	if (flags & H_R_XLATE)
	rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]);
	for (i = 0; i < n; ++i, ++pte_index) {
	hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
	r = hpte[1];
	if (hpte[0] & HPTE_V_VALID) {
	if (rev)
	r = rev[i].guest_rpte;
	else
	r = hpte[1] \| HPTE_R_RPN;
	}
	vcpu->arch.gpr[4 + i * 2] = hpte[0];
	vcpu->arch.gpr[5 + i * 2] = r;
	}
	return H_SUCCESS;
	}