[linux-2.6-block.git] / arch / powerpc / kvm / book3s_64_vio_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>
 * Copyright 2011 David Gibson, IBM Corporation <dwg@au1.ibm.com>
 * Copyright 2016 Alexey Kardashevskiy, IBM Corporation <aik@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/list.h>

#include <asm/tlbflush.h>
#include <asm/kvm_ppc.h>
#include <asm/kvm_book3s.h>
#include <asm/mmu-hash64.h>
#include <asm/mmu_context.h>
#include <asm/hvcall.h>
#include <asm/synch.h>
#include <asm/ppc-opcode.h>
#include <asm/kvm_host.h>
#include <asm/udbg.h>
#include <asm/iommu.h>
#include <asm/tce.h>
#include <asm/iommu.h>

#define TCES_PER_PAGE	(PAGE_SIZE / sizeof(u64))

/*
 * Finds a TCE table descriptor by LIOBN.
 *
 * WARNING: This will be called in real or virtual mode on HV KVM and virtual
 *          mode on PR KVM
 */
struct kvmppc_spapr_tce_table *kvmppc_find_table(struct kvm_vcpu *vcpu,
		unsigned long liobn)
{
	struct kvm *kvm = vcpu->kvm;
	struct kvmppc_spapr_tce_table *stt;

	list_for_each_entry_lockless(stt, &kvm->arch.spapr_tce_tables, list)
		if (stt->liobn == liobn)
			return stt;

	return NULL;
}
EXPORT_SYMBOL_GPL(kvmppc_find_table);

/*
 * Validates IO address.
 *
 * WARNING: This will be called in real-mode on HV KVM and virtual
 *          mode on PR KVM
 */
long kvmppc_ioba_validate(struct kvmppc_spapr_tce_table *stt,
		unsigned long ioba, unsigned long npages)
{
	unsigned long mask = (1ULL << stt->page_shift) - 1;
	unsigned long idx = ioba >> stt->page_shift;

	if ((ioba & mask) || (idx + npages > stt->size) || (idx + npages < idx))
		return H_PARAMETER;

	return H_SUCCESS;
}
EXPORT_SYMBOL_GPL(kvmppc_ioba_validate);

/*
 * Validates TCE address.
 * At the moment flags and page mask are validated.
 * As the host kernel does not access those addresses (just puts them
 * to the table and user space is supposed to process them), we can skip
 * checking other things (such as TCE is a guest RAM address or the page
 * was actually allocated).
 *
 * WARNING: This will be called in real-mode on HV KVM and virtual
 *          mode on PR KVM
 */
long kvmppc_tce_validate(struct kvmppc_spapr_tce_table *stt, unsigned long tce)
{
	unsigned long page_mask = ~((1ULL << stt->page_shift) - 1);
	unsigned long mask = ~(page_mask | TCE_PCI_WRITE | TCE_PCI_READ);

	if (tce & mask)
		return H_PARAMETER;

	return H_SUCCESS;
}
EXPORT_SYMBOL_GPL(kvmppc_tce_validate);

/* Note on the use of page_address() in real mode,
 *
 * It is safe to use page_address() in real mode on ppc64 because
 * page_address() is always defined as lowmem_page_address()
 * which returns __va(PFN_PHYS(page_to_pfn(page))) which is arithmetic
 * operation and does not access page struct.
 *
 * Theoretically page_address() could be defined different
 * but either WANT_PAGE_VIRTUAL or HASHED_PAGE_VIRTUAL
 * would have to be enabled.
 * WANT_PAGE_VIRTUAL is never enabled on ppc32/ppc64,
 * HASHED_PAGE_VIRTUAL could be enabled for ppc32 only and only
 * if CONFIG_HIGHMEM is defined. As CONFIG_SPARSEMEM_VMEMMAP
 * is not expected to be enabled on ppc32, page_address()
 * is safe for ppc32 as well.
 *
 * WARNING: This will be called in real-mode on HV KVM and virtual
 *          mode on PR KVM
 */
static u64 *kvmppc_page_address(struct page *page)
{
#if defined(HASHED_PAGE_VIRTUAL) || defined(WANT_PAGE_VIRTUAL)
#error TODO: fix to avoid page_address() here
#endif
	return (u64 *) page_address(page);
}

/*
 * Handles TCE requests for emulated devices.
 * Puts guest TCE values to the table and expects user space to convert them.
 * Called in both real and virtual modes.
 * Cannot fail so kvmppc_tce_validate must be called before it.
 *
 * WARNING: This will be called in real-mode on HV KVM and virtual
 *          mode on PR KVM
 */
void kvmppc_tce_put(struct kvmppc_spapr_tce_table *stt,
		unsigned long idx, unsigned long tce)
{
	struct page *page;
	u64 *tbl;

	page = stt->pages[idx / TCES_PER_PAGE];
	tbl = kvmppc_page_address(page);

	tbl[idx % TCES_PER_PAGE] = tce;
}
EXPORT_SYMBOL_GPL(kvmppc_tce_put);

long kvmppc_gpa_to_ua(struct kvm *kvm, unsigned long gpa,
		unsigned long *ua, unsigned long **prmap)
{
	unsigned long gfn = gpa >> PAGE_SHIFT;
	struct kvm_memory_slot *memslot;

	memslot = search_memslots(kvm_memslots(kvm), gfn);
	if (!memslot)
		return -EINVAL;

	*ua = __gfn_to_hva_memslot(memslot, gfn) |
		(gpa & ~(PAGE_MASK | TCE_PCI_READ | TCE_PCI_WRITE));

#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
	if (prmap)
		*prmap = &memslot->arch.rmap[gfn - memslot->base_gfn];
#endif

	return 0;
}
EXPORT_SYMBOL_GPL(kvmppc_gpa_to_ua);

#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
		      unsigned long ioba, unsigned long tce)
{
	struct kvmppc_spapr_tce_table *stt = kvmppc_find_table(vcpu, liobn);
	long ret;

	/* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */
	/* 	    liobn, ioba, tce); */

	if (!stt)
		return H_TOO_HARD;

	ret = kvmppc_ioba_validate(stt, ioba, 1);
	if (ret != H_SUCCESS)
		return ret;

	ret = kvmppc_tce_validate(stt, tce);
	if (ret != H_SUCCESS)
		return ret;

	kvmppc_tce_put(stt, ioba >> stt->page_shift, tce);

	return H_SUCCESS;
}
EXPORT_SYMBOL_GPL(kvmppc_h_put_tce);

static long kvmppc_rm_ua_to_hpa(struct kvm_vcpu *vcpu,
		unsigned long ua, unsigned long *phpa)
{
	pte_t *ptep, pte;
	unsigned shift = 0;

	ptep = __find_linux_pte_or_hugepte(vcpu->arch.pgdir, ua, NULL, &shift);
	if (!ptep || !pte_present(*ptep))
		return -ENXIO;
	pte = *ptep;

	if (!shift)
		shift = PAGE_SHIFT;

	/* Avoid handling anything potentially complicated in realmode */
	if (shift > PAGE_SHIFT)
		return -EAGAIN;

	if (!pte_young(pte))
		return -EAGAIN;

	*phpa = (pte_pfn(pte) << PAGE_SHIFT) | (ua & ((1ULL << shift) - 1)) |
			(ua & ~PAGE_MASK);

	return 0;
}

long kvmppc_rm_h_put_tce_indirect(struct kvm_vcpu *vcpu,
		unsigned long liobn, unsigned long ioba,
		unsigned long tce_list,	unsigned long npages)
{
	struct kvmppc_spapr_tce_table *stt;
	long i, ret = H_SUCCESS;
	unsigned long tces, entry, ua = 0;
	unsigned long *rmap = NULL;

	stt = kvmppc_find_table(vcpu, liobn);
	if (!stt)
		return H_TOO_HARD;

	entry = ioba >> stt->page_shift;
	/*
	 * The spec says that the maximum size of the list is 512 TCEs
	 * so the whole table addressed resides in 4K page
	 */
	if (npages > 512)
		return H_PARAMETER;

	if (tce_list & (SZ_4K - 1))
		return H_PARAMETER;

	ret = kvmppc_ioba_validate(stt, ioba, npages);
	if (ret != H_SUCCESS)
		return ret;

	if (kvmppc_gpa_to_ua(vcpu->kvm, tce_list, &ua, &rmap))
		return H_TOO_HARD;

	rmap = (void *) vmalloc_to_phys(rmap);

	/*
	 * Synchronize with the MMU notifier callbacks in
	 * book3s_64_mmu_hv.c (kvm_unmap_hva_hv etc.).
	 * While we have the rmap lock, code running on other CPUs
	 * cannot finish unmapping the host real page that backs
	 * this guest real page, so we are OK to access the host
	 * real page.
	 */
	lock_rmap(rmap);
	if (kvmppc_rm_ua_to_hpa(vcpu, ua, &tces)) {
		ret = H_TOO_HARD;
		goto unlock_exit;
	}

	for (i = 0; i < npages; ++i) {
		unsigned long tce = be64_to_cpu(((u64 *)tces)[i]);

		ret = kvmppc_tce_validate(stt, tce);
		if (ret != H_SUCCESS)
			goto unlock_exit;

		kvmppc_tce_put(stt, entry + i, tce);
	}

unlock_exit:
	unlock_rmap(rmap);

	return ret;
}

long kvmppc_h_stuff_tce(struct kvm_vcpu *vcpu,
		unsigned long liobn, unsigned long ioba,
		unsigned long tce_value, unsigned long npages)
{
	struct kvmppc_spapr_tce_table *stt;
	long i, ret;

	stt = kvmppc_find_table(vcpu, liobn);
	if (!stt)
		return H_TOO_HARD;

	ret = kvmppc_ioba_validate(stt, ioba, npages);
	if (ret != H_SUCCESS)
		return ret;

	/* Check permission bits only to allow userspace poison TCE for debug */
	if (tce_value & (TCE_PCI_WRITE | TCE_PCI_READ))
		return H_PARAMETER;

	for (i = 0; i < npages; ++i, ioba += (1ULL << stt->page_shift))
		kvmppc_tce_put(stt, ioba >> stt->page_shift, tce_value);

	return H_SUCCESS;
}
EXPORT_SYMBOL_GPL(kvmppc_h_stuff_tce);

long kvmppc_h_get_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
		      unsigned long ioba)
{
	struct kvmppc_spapr_tce_table *stt = kvmppc_find_table(vcpu, liobn);
	long ret;
	unsigned long idx;
	struct page *page;
	u64 *tbl;

	if (!stt)
		return H_TOO_HARD;

	ret = kvmppc_ioba_validate(stt, ioba, 1);
	if (ret != H_SUCCESS)
		return ret;

	idx = ioba >> stt->page_shift;
	page = stt->pages[idx / TCES_PER_PAGE];
	tbl = (u64 *)page_address(page);

	vcpu->arch.gpr[4] = tbl[idx % TCES_PER_PAGE];

	return H_SUCCESS;
}
EXPORT_SYMBOL_GPL(kvmppc_h_get_tce);

#endif /* KVM_BOOK3S_HV_POSSIBLE */
Commit	Line	Data
54738c09 DG	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	* Copyright 2011 David Gibson, IBM Corporation <dwg@au1.ibm.com>
d3695aa4	17	* Copyright 2016 Alexey Kardashevskiy, IBM Corporation <aik@au1.ibm.com>
54738c09 DG	18	*/
	19
	20	#include <linux/types.h>
	21	#include <linux/string.h>
	22	#include <linux/kvm.h>
	23	#include <linux/kvm_host.h>
	24	#include <linux/highmem.h>
	25	#include <linux/gfp.h>
	26	#include <linux/slab.h>
	27	#include <linux/hugetlb.h>
	28	#include <linux/list.h>
	29
	30	#include <asm/tlbflush.h>
	31	#include <asm/kvm_ppc.h>
	32	#include <asm/kvm_book3s.h>
	33	#include <asm/mmu-hash64.h>
d3695aa4	34	#include <asm/mmu_context.h>
54738c09 DG	35	#include <asm/hvcall.h>
	36	#include <asm/synch.h>
	37	#include <asm/ppc-opcode.h>
	38	#include <asm/kvm_host.h>
	39	#include <asm/udbg.h>
fcbb2ce6	40	#include <asm/iommu.h>
5ee7af18	41	#include <asm/tce.h>
d3695aa4	42	#include <asm/iommu.h>
54738c09 DG	43
	44	#define TCES_PER_PAGE (PAGE_SIZE / sizeof(u64))
	45
fcbb2ce6 AK	46	/*
	47	* Finds a TCE table descriptor by LIOBN.
	48	*
	49	* WARNING: This will be called in real or virtual mode on HV KVM and virtual
	50	* mode on PR KVM
	51	*/
d3695aa4	52	struct kvmppc_spapr_tce_table kvmppc_find_table(struct kvm_vcpu vcpu,
fcbb2ce6 AK	53	unsigned long liobn)
	54	{
	55	struct kvm *kvm = vcpu->kvm;
	56	struct kvmppc_spapr_tce_table *stt;
	57
366baf28	58	list_for_each_entry_lockless(stt, &kvm->arch.spapr_tce_tables, list)
fcbb2ce6 AK	59	if (stt->liobn == liobn)
	60	return stt;
	61
	62	return NULL;
	63	}
d3695aa4	64	EXPORT_SYMBOL_GPL(kvmppc_find_table);
fcbb2ce6 AK	65
	66	/*
	67	* Validates IO address.
	68	*
	69	* WARNING: This will be called in real-mode on HV KVM and virtual
	70	* mode on PR KVM
	71	*/
5ee7af18	72	long kvmppc_ioba_validate(struct kvmppc_spapr_tce_table *stt,
fcbb2ce6 AK	73	unsigned long ioba, unsigned long npages)
fcbb2ce6 AK	74	{
fe26e527 AK	75	unsigned long mask = (1ULL << stt->page_shift) - 1;
fe26e527 AK	76	unsigned long idx = ioba >> stt->page_shift;
fcbb2ce6	77
fe26e527	78	if ((ioba & mask) \|\| (idx + npages > stt->size) \|\| (idx + npages < idx))
fcbb2ce6 AK	79	return H_PARAMETER;
	80
	81	return H_SUCCESS;
	82	}
5ee7af18 AK	83	EXPORT_SYMBOL_GPL(kvmppc_ioba_validate);
	84
	85	/*
	86	* Validates TCE address.
	87	* At the moment flags and page mask are validated.
	88	* As the host kernel does not access those addresses (just puts them
	89	* to the table and user space is supposed to process them), we can skip
	90	* checking other things (such as TCE is a guest RAM address or the page
	91	* was actually allocated).
	92	*
	93	* WARNING: This will be called in real-mode on HV KVM and virtual
	94	* mode on PR KVM
	95	*/
	96	long kvmppc_tce_validate(struct kvmppc_spapr_tce_table *stt, unsigned long tce)
	97	{
fe26e527 AK	98	unsigned long page_mask = ~((1ULL << stt->page_shift) - 1);
fe26e527 AK	99	unsigned long mask = ~(page_mask \| TCE_PCI_WRITE \| TCE_PCI_READ);
5ee7af18 AK	100
	101	if (tce & mask)
	102	return H_PARAMETER;
	103
	104	return H_SUCCESS;
	105	}
	106	EXPORT_SYMBOL_GPL(kvmppc_tce_validate);
	107
	108	/* Note on the use of page_address() in real mode,
	109	*
	110	* It is safe to use page_address() in real mode on ppc64 because
	111	* page_address() is always defined as lowmem_page_address()
	112	* which returns __va(PFN_PHYS(page_to_pfn(page))) which is arithmetic
	113	* operation and does not access page struct.
	114	*
	115	* Theoretically page_address() could be defined different
	116	* but either WANT_PAGE_VIRTUAL or HASHED_PAGE_VIRTUAL
	117	* would have to be enabled.
	118	* WANT_PAGE_VIRTUAL is never enabled on ppc32/ppc64,
	119	* HASHED_PAGE_VIRTUAL could be enabled for ppc32 only and only
	120	* if CONFIG_HIGHMEM is defined. As CONFIG_SPARSEMEM_VMEMMAP
	121	* is not expected to be enabled on ppc32, page_address()
	122	* is safe for ppc32 as well.
	123	*
	124	* WARNING: This will be called in real-mode on HV KVM and virtual
	125	* mode on PR KVM
	126	*/
	127	static u64 kvmppc_page_address(struct page page)
	128	{
	129	#if defined(HASHED_PAGE_VIRTUAL) \|\| defined(WANT_PAGE_VIRTUAL)
	130	#error TODO: fix to avoid page_address() here
	131	#endif
	132	return (u64 *) page_address(page);
	133	}
	134
	135	/*
	136	* Handles TCE requests for emulated devices.
	137	* Puts guest TCE values to the table and expects user space to convert them.
	138	* Called in both real and virtual modes.
	139	* Cannot fail so kvmppc_tce_validate must be called before it.
	140	*
	141	* WARNING: This will be called in real-mode on HV KVM and virtual
	142	* mode on PR KVM
	143	*/
	144	void kvmppc_tce_put(struct kvmppc_spapr_tce_table *stt,
	145	unsigned long idx, unsigned long tce)
	146	{
	147	struct page *page;
	148	u64 *tbl;
	149
	150	page = stt->pages[idx / TCES_PER_PAGE];
	151	tbl = kvmppc_page_address(page);
	152
	153	tbl[idx % TCES_PER_PAGE] = tce;
	154	}
	155	EXPORT_SYMBOL_GPL(kvmppc_tce_put);
fcbb2ce6	156
d3695aa4 AK	157	long kvmppc_gpa_to_ua(struct kvm *kvm, unsigned long gpa,
	158	unsigned long ua, unsigned long *prmap)
	159	{
	160	unsigned long gfn = gpa >> PAGE_SHIFT;
	161	struct kvm_memory_slot *memslot;
	162
	163	memslot = search_memslots(kvm_memslots(kvm), gfn);
	164	if (!memslot)
	165	return -EINVAL;
	166
	167	*ua = __gfn_to_hva_memslot(memslot, gfn) \|
	168	(gpa & ~(PAGE_MASK \| TCE_PCI_READ \| TCE_PCI_WRITE));
	169
	170	#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
	171	if (prmap)
	172	*prmap = &memslot->arch.rmap[gfn - memslot->base_gfn];
	173	#endif
	174
	175	return 0;
	176	}
	177	EXPORT_SYMBOL_GPL(kvmppc_gpa_to_ua);
	178
	179	#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
54738c09 DG	180	long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
	181	unsigned long ioba, unsigned long tce)
	182	{
fcbb2ce6 AK	183	struct kvmppc_spapr_tce_table *stt = kvmppc_find_table(vcpu, liobn);
fcbb2ce6 AK	184	long ret;
54738c09 DG	185
	186	/* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */
	187	/* liobn, ioba, tce); */
	188
fcbb2ce6 AK	189	if (!stt)
	190	return H_TOO_HARD;
	191
	192	ret = kvmppc_ioba_validate(stt, ioba, 1);
	193	if (ret != H_SUCCESS)
	194	return ret;
	195
5ee7af18 AK	196	ret = kvmppc_tce_validate(stt, tce);
	197	if (ret != H_SUCCESS)
	198	return ret;
fcbb2ce6	199
fe26e527	200	kvmppc_tce_put(stt, ioba >> stt->page_shift, tce);
fcbb2ce6 AK	201
fcbb2ce6 AK	202	return H_SUCCESS;
54738c09	203	}
066212e0	204	EXPORT_SYMBOL_GPL(kvmppc_h_put_tce);
69e9fbb2	205
d3695aa4 AK	206	static long kvmppc_rm_ua_to_hpa(struct kvm_vcpu *vcpu,
	207	unsigned long ua, unsigned long *phpa)
	208	{
	209	pte_t *ptep, pte;
	210	unsigned shift = 0;
	211
	212	ptep = __find_linux_pte_or_hugepte(vcpu->arch.pgdir, ua, NULL, &shift);
	213	if (!ptep \|\| !pte_present(*ptep))
	214	return -ENXIO;
	215	pte = *ptep;
	216
	217	if (!shift)
	218	shift = PAGE_SHIFT;
	219
	220	/* Avoid handling anything potentially complicated in realmode */
	221	if (shift > PAGE_SHIFT)
	222	return -EAGAIN;
	223
	224	if (!pte_young(pte))
	225	return -EAGAIN;
	226
	227	*phpa = (pte_pfn(pte) << PAGE_SHIFT) \| (ua & ((1ULL << shift) - 1)) \|
	228	(ua & ~PAGE_MASK);
	229
	230	return 0;
	231	}
	232
	233	long kvmppc_rm_h_put_tce_indirect(struct kvm_vcpu *vcpu,
	234	unsigned long liobn, unsigned long ioba,
	235	unsigned long tce_list, unsigned long npages)
	236	{
	237	struct kvmppc_spapr_tce_table *stt;
	238	long i, ret = H_SUCCESS;
	239	unsigned long tces, entry, ua = 0;
	240	unsigned long *rmap = NULL;
	241
	242	stt = kvmppc_find_table(vcpu, liobn);
	243	if (!stt)
	244	return H_TOO_HARD;
	245
fe26e527	246	entry = ioba >> stt->page_shift;
d3695aa4 AK	247	/*
	248	* The spec says that the maximum size of the list is 512 TCEs
	249	* so the whole table addressed resides in 4K page
	250	*/
	251	if (npages > 512)
	252	return H_PARAMETER;
	253
	254	if (tce_list & (SZ_4K - 1))
	255	return H_PARAMETER;
	256
	257	ret = kvmppc_ioba_validate(stt, ioba, npages);
	258	if (ret != H_SUCCESS)
	259	return ret;
	260
	261	if (kvmppc_gpa_to_ua(vcpu->kvm, tce_list, &ua, &rmap))
	262	return H_TOO_HARD;
	263
	264	rmap = (void *) vmalloc_to_phys(rmap);
	265
	266	/*
	267	* Synchronize with the MMU notifier callbacks in
	268	* book3s_64_mmu_hv.c (kvm_unmap_hva_hv etc.).
	269	* While we have the rmap lock, code running on other CPUs
	270	* cannot finish unmapping the host real page that backs
	271	* this guest real page, so we are OK to access the host
	272	* real page.
	273	*/
	274	lock_rmap(rmap);
	275	if (kvmppc_rm_ua_to_hpa(vcpu, ua, &tces)) {
	276	ret = H_TOO_HARD;
	277	goto unlock_exit;
	278	}
	279
	280	for (i = 0; i < npages; ++i) {
	281	unsigned long tce = be64_to_cpu(((u64 *)tces)[i]);
	282
	283	ret = kvmppc_tce_validate(stt, tce);
	284	if (ret != H_SUCCESS)
	285	goto unlock_exit;
	286
	287	kvmppc_tce_put(stt, entry + i, tce);
	288	}
	289
	290	unlock_exit:
	291	unlock_rmap(rmap);
	292
	293	return ret;
	294	}
	295
	296	long kvmppc_h_stuff_tce(struct kvm_vcpu *vcpu,
	297	unsigned long liobn, unsigned long ioba,
	298	unsigned long tce_value, unsigned long npages)
	299	{
	300	struct kvmppc_spapr_tce_table *stt;
	301	long i, ret;
	302
	303	stt = kvmppc_find_table(vcpu, liobn);
	304	if (!stt)
	305	return H_TOO_HARD;
	306
	307	ret = kvmppc_ioba_validate(stt, ioba, npages);
	308	if (ret != H_SUCCESS)
	309	return ret;
	310
311	/* Check permission bits only to allow userspace poison TCE for debug */
312	if (tce_value & (TCE_PCI_WRITE \| TCE_PCI_READ))
313	return H_PARAMETER;
314
fe26e527 AK	315	for (i = 0; i < npages; ++i, ioba += (1ULL << stt->page_shift))
fe26e527 AK	316	kvmppc_tce_put(stt, ioba >> stt->page_shift, tce_value);
d3695aa4 AK	317
	318	return H_SUCCESS;
	319	}
	320	EXPORT_SYMBOL_GPL(kvmppc_h_stuff_tce);
	321
69e9fbb2 LD	322	long kvmppc_h_get_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
	323	unsigned long ioba)
	324	{
fcbb2ce6 AK	325	struct kvmppc_spapr_tce_table *stt = kvmppc_find_table(vcpu, liobn);
	326	long ret;
	327	unsigned long idx;
	328	struct page *page;
	329	u64 *tbl;
69e9fbb2	330
fcbb2ce6 AK	331	if (!stt)
fcbb2ce6 AK	332	return H_TOO_HARD;
69e9fbb2	333
fcbb2ce6 AK	334	ret = kvmppc_ioba_validate(stt, ioba, 1);
	335	if (ret != H_SUCCESS)
	336	return ret;
69e9fbb2	337
fe26e527	338	idx = ioba >> stt->page_shift;
fcbb2ce6 AK	339	page = stt->pages[idx / TCES_PER_PAGE];
fcbb2ce6 AK	340	tbl = (u64 *)page_address(page);
69e9fbb2	341
fcbb2ce6	342	vcpu->arch.gpr[4] = tbl[idx % TCES_PER_PAGE];
69e9fbb2	343
fcbb2ce6	344	return H_SUCCESS;
69e9fbb2 LD	345	}
69e9fbb2 LD	346	EXPORT_SYMBOL_GPL(kvmppc_h_get_tce);
d3695aa4 AK	347
d3695aa4 AK	348	#endif /* KVM_BOOK3S_HV_POSSIBLE */