[mirror_ubuntu-artful-kernel.git] / arch / powerpc / kvm / book3s_64_mmu_hv.c

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2, as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright 2010 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/highmem.h>
#include <linux/gfp.h>
#include <linux/slab.h>
#include <linux/hugetlb.h>
#include <linux/vmalloc.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>
#include <asm/cputable.h>

/* Pages in the VRMA are 16MB pages */
#define VRMA_PAGE_ORDER	24
#define VRMA_VSID	0x1ffffffUL	/* 1TB VSID reserved for VRMA */

/* POWER7 has 10-bit LPIDs, PPC970 has 6-bit LPIDs */
#define MAX_LPID_970	63
#define NR_LPIDS	(LPID_RSVD + 1)
unsigned long lpid_inuse[BITS_TO_LONGS(NR_LPIDS)];

long kvmppc_alloc_hpt(struct kvm *kvm)
{
	unsigned long hpt;
	unsigned long lpid;
	struct revmap_entry *rev;

	/* Allocate guest's hashed page table */
	hpt = __get_free_pages(GFP_KERNEL|__GFP_ZERO|__GFP_REPEAT|__GFP_NOWARN,
			       HPT_ORDER - PAGE_SHIFT);
	if (!hpt) {
		pr_err("kvm_alloc_hpt: Couldn't alloc HPT\n");
		return -ENOMEM;
	}
	kvm->arch.hpt_virt = hpt;

	/* Allocate reverse map array */
	rev = vmalloc(sizeof(struct revmap_entry) * HPT_NPTE);
	if (!rev) {
		pr_err("kvmppc_alloc_hpt: Couldn't alloc reverse map array\n");
		goto out_freehpt;
	}
	kvm->arch.revmap = rev;

	/* Allocate the guest's logical partition ID */
	do {
		lpid = find_first_zero_bit(lpid_inuse, NR_LPIDS);
		if (lpid >= NR_LPIDS) {
			pr_err("kvm_alloc_hpt: No LPIDs free\n");
			goto out_freeboth;
		}
	} while (test_and_set_bit(lpid, lpid_inuse));

	kvm->arch.sdr1 = __pa(hpt) | (HPT_ORDER - 18);
	kvm->arch.lpid = lpid;

	pr_info("KVM guest htab at %lx, LPID %lx\n", hpt, lpid);
	return 0;

 out_freeboth:
	vfree(rev);
 out_freehpt:
	free_pages(hpt, HPT_ORDER - PAGE_SHIFT);
	return -ENOMEM;
}

void kvmppc_free_hpt(struct kvm *kvm)
{
	clear_bit(kvm->arch.lpid, lpid_inuse);
	vfree(kvm->arch.revmap);
	free_pages(kvm->arch.hpt_virt, HPT_ORDER - PAGE_SHIFT);
}

void kvmppc_map_vrma(struct kvm_vcpu *vcpu, struct kvm_memory_slot *memslot)
{
	struct kvm *kvm = vcpu->kvm;
	unsigned long i;
	unsigned long npages;
	unsigned long hp_v, hp_r;
	unsigned long addr, hash;
	unsigned long porder = kvm->arch.ram_porder;
	long ret;

	npages = kvm->arch.slot_npages[memslot->id];

	/* VRMA can't be > 1TB */
	if (npages > 1ul << (40 - porder))
		npages = 1ul << (40 - porder);
	/* Can't use more than 1 HPTE per HPTEG */
	if (npages > HPT_NPTEG)
		npages = HPT_NPTEG;

	for (i = 0; i < npages; ++i) {
		addr = i << porder;
		/* can't use hpt_hash since va > 64 bits */
		hash = (i ^ (VRMA_VSID ^ (VRMA_VSID << 25))) & HPT_HASH_MASK;
		/*
		 * We assume that the hash table is empty and no
		 * vcpus are using it at this stage.  Since we create
		 * at most one HPTE per HPTEG, we just assume entry 7
		 * is available and use it.
		 */
		hash = (hash << 3) + 7;
		hp_v = HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16)) |
			(i << (VRMA_PAGE_ORDER - 16)) | HPTE_V_BOLTED |
			HPTE_V_LARGE | HPTE_V_VALID;
		hp_r = addr | HPTE_R_R | HPTE_R_C | HPTE_R_M | PP_RWXX;
		ret = kvmppc_virtmode_h_enter(vcpu, H_EXACT, hash, hp_v, hp_r);
		if (ret != H_SUCCESS) {
			pr_err("KVM: map_vrma at %lx failed, ret=%ld\n",
			       addr, ret);
			break;
		}
	}
}

int kvmppc_mmu_hv_init(void)
{
	unsigned long host_lpid, rsvd_lpid;

	if (!cpu_has_feature(CPU_FTR_HVMODE))
		return -EINVAL;

	memset(lpid_inuse, 0, sizeof(lpid_inuse));

	if (cpu_has_feature(CPU_FTR_ARCH_206)) {
		host_lpid = mfspr(SPRN_LPID);	/* POWER7 */
		rsvd_lpid = LPID_RSVD;
	} else {
		host_lpid = 0;			/* PPC970 */
		rsvd_lpid = MAX_LPID_970;
	}

	set_bit(host_lpid, lpid_inuse);
	/* rsvd_lpid is reserved for use in partition switching */
	set_bit(rsvd_lpid, lpid_inuse);

	return 0;
}

void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu)
{
}

static void kvmppc_mmu_book3s_64_hv_reset_msr(struct kvm_vcpu *vcpu)
{
	kvmppc_set_msr(vcpu, MSR_SF | MSR_ME);
}

/*
 * This is called to get a reference to a guest page if there isn't
 * one already in the kvm->arch.slot_phys[][] arrays.
 */
static long kvmppc_get_guest_page(struct kvm *kvm, unsigned long gfn,
				  struct kvm_memory_slot *memslot)
{
	unsigned long start;
	long np;
	struct page *page, *pages[1];
	unsigned long *physp;
	unsigned long pfn, i;

	physp = kvm->arch.slot_phys[memslot->id];
	if (!physp)
		return -EINVAL;
	i = (gfn - memslot->base_gfn) >> (kvm->arch.ram_porder - PAGE_SHIFT);
	if (physp[i])
		return 0;

	page = NULL;
	start = gfn_to_hva_memslot(memslot, gfn);

	/* Instantiate and get the page we want access to */
	np = get_user_pages_fast(start, 1, 1, pages);
	if (np != 1)
		return -EINVAL;
	page = pages[0];

	/* Check it's a 16MB page */
	if (!PageHead(page) ||
	    compound_order(page) != (kvm->arch.ram_porder - PAGE_SHIFT)) {
		pr_err("page at %lx isn't 16MB (o=%d)\n",
		       start, compound_order(page));
		put_page(page);
		return -EINVAL;
	}
	pfn = page_to_pfn(page);

	spin_lock(&kvm->arch.slot_phys_lock);
	if (!physp[i])
		physp[i] = (pfn << PAGE_SHIFT) | KVMPPC_GOT_PAGE;
	else
		put_page(page);
	spin_unlock(&kvm->arch.slot_phys_lock);

	return 0;
}

/*
 * We come here on a H_ENTER call from the guest when
 * we don't have the requested page pinned already.
 */
long kvmppc_virtmode_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 psize, gpa, gfn;
	struct kvm_memory_slot *memslot;
	long ret;

	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 = gfn_to_memslot(kvm, gfn);
	if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
		return H_PARAMETER;
	if (kvmppc_get_guest_page(kvm, gfn, memslot) < 0)
		return H_PARAMETER;

	preempt_disable();
	ret = kvmppc_h_enter(vcpu, flags, pte_index, pteh, ptel);
	preempt_enable();
	if (ret == H_TOO_HARD) {
		/* this can't happen */
		pr_err("KVM: Oops, kvmppc_h_enter returned too hard!\n");
		ret = H_RESOURCE;	/* or something */
	}
	return ret;

}

static int kvmppc_mmu_book3s_64_hv_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
				struct kvmppc_pte *gpte, bool data)
{
	return -ENOENT;
}

void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa,
			    unsigned long *nb_ret)
{
	struct kvm_memory_slot *memslot;
	unsigned long gfn = gpa >> PAGE_SHIFT;
	struct page *page;
	unsigned long offset;
	unsigned long pfn, pa;
	unsigned long *physp;

	memslot = gfn_to_memslot(kvm, gfn);
	if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
		return NULL;
	physp = kvm->arch.slot_phys[memslot->id];
	if (!physp)
		return NULL;
	physp += (gfn - memslot->base_gfn) >>
		(kvm->arch.ram_porder - PAGE_SHIFT);
	pa = *physp;
	if (!pa) {
		if (kvmppc_get_guest_page(kvm, gfn, memslot) < 0)
			return NULL;
		pa = *physp;
	}
	pfn = pa >> PAGE_SHIFT;
	page = pfn_to_page(pfn);
	get_page(page);
	offset = gpa & (kvm->arch.ram_psize - 1);
	if (nb_ret)
		*nb_ret = kvm->arch.ram_psize - offset;
	return page_address(page) + offset;
}

void kvmppc_unpin_guest_page(struct kvm *kvm, void *va)
{
	struct page *page = virt_to_page(va);

	page = compound_head(page);
	put_page(page);
}

void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu)
{
	struct kvmppc_mmu *mmu = &vcpu->arch.mmu;

	if (cpu_has_feature(CPU_FTR_ARCH_206))
		vcpu->arch.slb_nr = 32;		/* POWER7 */
	else
		vcpu->arch.slb_nr = 64;

	mmu->xlate = kvmppc_mmu_book3s_64_hv_xlate;
	mmu->reset_msr = kvmppc_mmu_book3s_64_hv_reset_msr;

	vcpu->arch.hflags |= BOOK3S_HFLAG_SLB;
}
Commit	Line	Data
de56a948 PM	1	/*
	2	* This program is free software; you can redistribute it and/or modify
	3	* it under the terms of the GNU General Public License, version 2, as
	4	* published by the Free Software Foundation.
	5	*
	6	* This program is distributed in the hope that it will be useful,
	7	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	8	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	9	* GNU General Public License for more details.
	10	*
	11	* You should have received a copy of the GNU General Public License
	12	* along with this program; if not, write to the Free Software
	13	* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	14	*
	15	* Copyright 2010 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
	16	*/
	17
	18	#include <linux/types.h>
	19	#include <linux/string.h>
	20	#include <linux/kvm.h>
	21	#include <linux/kvm_host.h>
	22	#include <linux/highmem.h>
	23	#include <linux/gfp.h>
	24	#include <linux/slab.h>
	25	#include <linux/hugetlb.h>
8936dda4	26	#include <linux/vmalloc.h>
de56a948 PM	27
	28	#include <asm/tlbflush.h>
	29	#include <asm/kvm_ppc.h>
	30	#include <asm/kvm_book3s.h>
	31	#include <asm/mmu-hash64.h>
	32	#include <asm/hvcall.h>
	33	#include <asm/synch.h>
	34	#include <asm/ppc-opcode.h>
	35	#include <asm/cputable.h>
	36
de56a948 PM	37	/* Pages in the VRMA are 16MB pages */
	38	#define VRMA_PAGE_ORDER 24
	39	#define VRMA_VSID 0x1ffffffUL /* 1TB VSID reserved for VRMA */
	40
9e368f29 PM	41	/* POWER7 has 10-bit LPIDs, PPC970 has 6-bit LPIDs */
9e368f29 PM	42	#define MAX_LPID_970 63
de56a948 PM	43	#define NR_LPIDS (LPID_RSVD + 1)
	44	unsigned long lpid_inuse[BITS_TO_LONGS(NR_LPIDS)];
	45
	46	long kvmppc_alloc_hpt(struct kvm *kvm)
	47	{
	48	unsigned long hpt;
	49	unsigned long lpid;
8936dda4	50	struct revmap_entry *rev;
de56a948	51
8936dda4	52	/* Allocate guest's hashed page table */
de56a948 PM	53	hpt = __get_free_pages(GFP_KERNEL\|__GFP_ZERO\|__GFP_REPEAT\|__GFP_NOWARN,
	54	HPT_ORDER - PAGE_SHIFT);
	55	if (!hpt) {
	56	pr_err("kvm_alloc_hpt: Couldn't alloc HPT\n");
	57	return -ENOMEM;
	58	}
	59	kvm->arch.hpt_virt = hpt;
	60
8936dda4 PM	61	/* Allocate reverse map array */
	62	rev = vmalloc(sizeof(struct revmap_entry) * HPT_NPTE);
	63	if (!rev) {
	64	pr_err("kvmppc_alloc_hpt: Couldn't alloc reverse map array\n");
	65	goto out_freehpt;
	66	}
	67	kvm->arch.revmap = rev;
	68
	69	/* Allocate the guest's logical partition ID */
de56a948 PM	70	do {
	71	lpid = find_first_zero_bit(lpid_inuse, NR_LPIDS);
	72	if (lpid >= NR_LPIDS) {
	73	pr_err("kvm_alloc_hpt: No LPIDs free\n");
8936dda4	74	goto out_freeboth;
de56a948 PM	75	}
	76	} while (test_and_set_bit(lpid, lpid_inuse));
	77
	78	kvm->arch.sdr1 = __pa(hpt) \| (HPT_ORDER - 18);
	79	kvm->arch.lpid = lpid;
de56a948 PM	80
	81	pr_info("KVM guest htab at %lx, LPID %lx\n", hpt, lpid);
	82	return 0;
8936dda4 PM	83
	84	out_freeboth:
	85	vfree(rev);
	86	out_freehpt:
	87	free_pages(hpt, HPT_ORDER - PAGE_SHIFT);
	88	return -ENOMEM;
de56a948 PM	89	}
	90
	91	void kvmppc_free_hpt(struct kvm *kvm)
	92	{
de56a948	93	clear_bit(kvm->arch.lpid, lpid_inuse);
8936dda4	94	vfree(kvm->arch.revmap);
de56a948	95	free_pages(kvm->arch.hpt_virt, HPT_ORDER - PAGE_SHIFT);
de56a948 PM	96	}
de56a948 PM	97
c77162de	98	void kvmppc_map_vrma(struct kvm_vcpu vcpu, struct kvm_memory_slot memslot)
de56a948	99	{
c77162de	100	struct kvm *kvm = vcpu->kvm;
de56a948	101	unsigned long i;
b2b2f165	102	unsigned long npages;
c77162de PM	103	unsigned long hp_v, hp_r;
c77162de PM	104	unsigned long addr, hash;
8936dda4	105	unsigned long porder = kvm->arch.ram_porder;
c77162de	106	long ret;
de56a948	107
c77162de	108	npages = kvm->arch.slot_npages[memslot->id];
de56a948 PM	109
de56a948 PM	110	/* VRMA can't be > 1TB */
8936dda4 PM	111	if (npages > 1ul << (40 - porder))
8936dda4 PM	112	npages = 1ul << (40 - porder);
de56a948 PM	113	/* Can't use more than 1 HPTE per HPTEG */
	114	if (npages > HPT_NPTEG)
	115	npages = HPT_NPTEG;
	116
	117	for (i = 0; i < npages; ++i) {
c77162de	118	addr = i << porder;
de56a948 PM	119	/* can't use hpt_hash since va > 64 bits */
	120	hash = (i ^ (VRMA_VSID ^ (VRMA_VSID << 25))) & HPT_HASH_MASK;
	121	/*
	122	* We assume that the hash table is empty and no
	123	* vcpus are using it at this stage. Since we create
	124	* at most one HPTE per HPTEG, we just assume entry 7
	125	* is available and use it.
	126	*/
8936dda4	127	hash = (hash << 3) + 7;
c77162de	128	hp_v = HPTE_V_1TB_SEG \| (VRMA_VSID << (40 - 16)) \|
de56a948 PM	129	(i << (VRMA_PAGE_ORDER - 16)) \| HPTE_V_BOLTED \|
de56a948 PM	130	HPTE_V_LARGE \| HPTE_V_VALID;
c77162de PM	131	hp_r = addr \| HPTE_R_R \| HPTE_R_C \| HPTE_R_M \| PP_RWXX;
	132	ret = kvmppc_virtmode_h_enter(vcpu, H_EXACT, hash, hp_v, hp_r);
	133	if (ret != H_SUCCESS) {
	134	pr_err("KVM: map_vrma at %lx failed, ret=%ld\n",
	135	addr, ret);
	136	break;
	137	}
de56a948 PM	138	}
	139	}
	140
	141	int kvmppc_mmu_hv_init(void)
	142	{
9e368f29 PM	143	unsigned long host_lpid, rsvd_lpid;
	144
	145	if (!cpu_has_feature(CPU_FTR_HVMODE))
de56a948	146	return -EINVAL;
9e368f29	147
de56a948	148	memset(lpid_inuse, 0, sizeof(lpid_inuse));
9e368f29 PM	149
	150	if (cpu_has_feature(CPU_FTR_ARCH_206)) {
	151	host_lpid = mfspr(SPRN_LPID); /* POWER7 */
	152	rsvd_lpid = LPID_RSVD;
	153	} else {
	154	host_lpid = 0; /* PPC970 */
	155	rsvd_lpid = MAX_LPID_970;
	156	}
	157
	158	set_bit(host_lpid, lpid_inuse);
	159	/* rsvd_lpid is reserved for use in partition switching */
	160	set_bit(rsvd_lpid, lpid_inuse);
de56a948 PM	161
	162	return 0;
	163	}
	164
	165	void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu)
	166	{
	167	}
	168
	169	static void kvmppc_mmu_book3s_64_hv_reset_msr(struct kvm_vcpu *vcpu)
	170	{
	171	kvmppc_set_msr(vcpu, MSR_SF \| MSR_ME);
	172	}
	173
c77162de PM	174	/*
	175	* This is called to get a reference to a guest page if there isn't
	176	* one already in the kvm->arch.slot_phys[][] arrays.
	177	*/
	178	static long kvmppc_get_guest_page(struct kvm *kvm, unsigned long gfn,
	179	struct kvm_memory_slot *memslot)
	180	{
	181	unsigned long start;
	182	long np;
	183	struct page page, pages[1];
	184	unsigned long *physp;
	185	unsigned long pfn, i;
	186
	187	physp = kvm->arch.slot_phys[memslot->id];
	188	if (!physp)
	189	return -EINVAL;
	190	i = (gfn - memslot->base_gfn) >> (kvm->arch.ram_porder - PAGE_SHIFT);
	191	if (physp[i])
	192	return 0;
	193
	194	page = NULL;
	195	start = gfn_to_hva_memslot(memslot, gfn);
	196
	197	/* Instantiate and get the page we want access to */
	198	np = get_user_pages_fast(start, 1, 1, pages);
	199	if (np != 1)
	200	return -EINVAL;
	201	page = pages[0];
	202
	203	/* Check it's a 16MB page */
	204	if (!PageHead(page) \|\|
	205	compound_order(page) != (kvm->arch.ram_porder - PAGE_SHIFT)) {
	206	pr_err("page at %lx isn't 16MB (o=%d)\n",
	207	start, compound_order(page));
	208	put_page(page);
	209	return -EINVAL;
	210	}
	211	pfn = page_to_pfn(page);
	212
	213	spin_lock(&kvm->arch.slot_phys_lock);
	214	if (!physp[i])
	215	physp[i] = (pfn << PAGE_SHIFT) \| KVMPPC_GOT_PAGE;
	216	else
	217	put_page(page);
	218	spin_unlock(&kvm->arch.slot_phys_lock);
	219
	220	return 0;
	221	}
	222
	223	/*
	224	* We come here on a H_ENTER call from the guest when
	225	* we don't have the requested page pinned already.
	226	*/
	227	long kvmppc_virtmode_h_enter(struct kvm_vcpu *vcpu, unsigned long flags,
	228	long pte_index, unsigned long pteh, unsigned long ptel)
	229	{
	230	struct kvm *kvm = vcpu->kvm;
	231	unsigned long psize, gpa, gfn;
	232	struct kvm_memory_slot *memslot;
	233	long ret;
	234
	235	psize = hpte_page_size(pteh, ptel);
	236	if (!psize)
	237	return H_PARAMETER;
238
239	/* Find the memslot (if any) for this address */
240	gpa = (ptel & HPTE_R_RPN) & ~(psize - 1);
241	gfn = gpa >> PAGE_SHIFT;
242	memslot = gfn_to_memslot(kvm, gfn);
243	if (!memslot \|\| (memslot->flags & KVM_MEMSLOT_INVALID))
244	return H_PARAMETER;
245	if (kvmppc_get_guest_page(kvm, gfn, memslot) < 0)
246	return H_PARAMETER;
247
248	preempt_disable();
249	ret = kvmppc_h_enter(vcpu, flags, pte_index, pteh, ptel);
250	preempt_enable();
251	if (ret == H_TOO_HARD) {
252	/* this can't happen */
253	pr_err("KVM: Oops, kvmppc_h_enter returned too hard!\n");
254	ret = H_RESOURCE; /* or something */
255	}
256	return ret;
257
258	}
259
de56a948 PM	260	static int kvmppc_mmu_book3s_64_hv_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
	261	struct kvmppc_pte *gpte, bool data)
	262	{
	263	return -ENOENT;
	264	}
	265
93e60249 PM	266	void kvmppc_pin_guest_page(struct kvm kvm, unsigned long gpa,
	267	unsigned long *nb_ret)
	268	{
	269	struct kvm_memory_slot *memslot;
	270	unsigned long gfn = gpa >> PAGE_SHIFT;
	271	struct page *page;
	272	unsigned long offset;
	273	unsigned long pfn, pa;
	274	unsigned long *physp;
	275
	276	memslot = gfn_to_memslot(kvm, gfn);
	277	if (!memslot \|\| (memslot->flags & KVM_MEMSLOT_INVALID))
	278	return NULL;
	279	physp = kvm->arch.slot_phys[memslot->id];
	280	if (!physp)
	281	return NULL;
	282	physp += (gfn - memslot->base_gfn) >>
	283	(kvm->arch.ram_porder - PAGE_SHIFT);
	284	pa = *physp;
c77162de PM	285	if (!pa) {
	286	if (kvmppc_get_guest_page(kvm, gfn, memslot) < 0)
	287	return NULL;
	288	pa = *physp;
	289	}
93e60249 PM	290	pfn = pa >> PAGE_SHIFT;
	291	page = pfn_to_page(pfn);
	292	get_page(page);
	293	offset = gpa & (kvm->arch.ram_psize - 1);
	294	if (nb_ret)
	295	*nb_ret = kvm->arch.ram_psize - offset;
	296	return page_address(page) + offset;
	297	}
	298
	299	void kvmppc_unpin_guest_page(struct kvm kvm, void va)
	300	{
	301	struct page *page = virt_to_page(va);
	302
	303	page = compound_head(page);
	304	put_page(page);
	305	}
	306
de56a948 PM	307	void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu)
	308	{
	309	struct kvmppc_mmu *mmu = &vcpu->arch.mmu;
	310
9e368f29 PM	311	if (cpu_has_feature(CPU_FTR_ARCH_206))
	312	vcpu->arch.slb_nr = 32; /* POWER7 */
	313	else
	314	vcpu->arch.slb_nr = 64;
de56a948 PM	315
	316	mmu->xlate = kvmppc_mmu_book3s_64_hv_xlate;
	317	mmu->reset_msr = kvmppc_mmu_book3s_64_hv_reset_msr;
	318
	319	vcpu->arch.hflags \|= BOOK3S_HFLAG_SLB;
	320	}