[deliverable/linux.git] / virt / kvm / iommu.c

/*
 * Copyright (c) 2006, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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, Inc., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307 USA.
 *
 * Copyright (C) 2006-2008 Intel Corporation
 * Copyright IBM Corporation, 2008
 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
 *
 * Author: Allen M. Kay <allen.m.kay@intel.com>
 * Author: Weidong Han <weidong.han@intel.com>
 * Author: Ben-Ami Yassour <benami@il.ibm.com>
 */

#include <linux/list.h>
#include <linux/kvm_host.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/stat.h>
#include <linux/dmar.h>
#include <linux/iommu.h>
#include <linux/intel-iommu.h>

static bool allow_unsafe_assigned_interrupts;
module_param_named(allow_unsafe_assigned_interrupts,
		   allow_unsafe_assigned_interrupts, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(allow_unsafe_assigned_interrupts,
 "Enable device assignment on platforms without interrupt remapping support.");

static int kvm_iommu_unmap_memslots(struct kvm *kvm);
static void kvm_iommu_put_pages(struct kvm *kvm,
				gfn_t base_gfn, unsigned long npages);

static pfn_t kvm_pin_pages(struct kvm_memory_slot *slot, gfn_t gfn,
			   unsigned long npages)
{
	gfn_t end_gfn;
	pfn_t pfn;

	pfn     = gfn_to_pfn_memslot(slot, gfn);
	end_gfn = gfn + npages;
	gfn    += 1;

	if (is_error_noslot_pfn(pfn))
		return pfn;

	while (gfn < end_gfn)
		gfn_to_pfn_memslot(slot, gfn++);

	return pfn;
}

static void kvm_unpin_pages(struct kvm *kvm, pfn_t pfn, unsigned long npages)
{
	unsigned long i;

	for (i = 0; i < npages; ++i)
		kvm_release_pfn_clean(pfn + i);
}

int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
{
	gfn_t gfn, end_gfn;
	pfn_t pfn;
	int r = 0;
	struct iommu_domain *domain = kvm->arch.iommu_domain;
	int flags;

	/* check if iommu exists and in use */
	if (!domain)
		return 0;

	gfn     = slot->base_gfn;
	end_gfn = gfn + slot->npages;

	flags = IOMMU_READ;
	if (!(slot->flags & KVM_MEM_READONLY))
		flags |= IOMMU_WRITE;
	if (!kvm->arch.iommu_noncoherent)
		flags |= IOMMU_CACHE;


	while (gfn < end_gfn) {
		unsigned long page_size;

		/* Check if already mapped */
		if (iommu_iova_to_phys(domain, gfn_to_gpa(gfn))) {
			gfn += 1;
			continue;
		}

		/* Get the page size we could use to map */
		page_size = kvm_host_page_size(kvm, gfn);

		/* Make sure the page_size does not exceed the memslot */
		while ((gfn + (page_size >> PAGE_SHIFT)) > end_gfn)
			page_size >>= 1;

		/* Make sure gfn is aligned to the page size we want to map */
		while ((gfn << PAGE_SHIFT) & (page_size - 1))
			page_size >>= 1;

		/* Make sure hva is aligned to the page size we want to map */
		while (__gfn_to_hva_memslot(slot, gfn) & (page_size - 1))
			page_size >>= 1;

		/*
		 * Pin all pages we are about to map in memory. This is
		 * important because we unmap and unpin in 4kb steps later.
		 */
		pfn = kvm_pin_pages(slot, gfn, page_size >> PAGE_SHIFT);
		if (is_error_noslot_pfn(pfn)) {
			gfn += 1;
			continue;
		}

		/* Map into IO address space */
		r = iommu_map(domain, gfn_to_gpa(gfn), pfn_to_hpa(pfn),
			      page_size, flags);
		if (r) {
			printk(KERN_ERR "kvm_iommu_map_address:"
			       "iommu failed to map pfn=%llx\n", pfn);
			kvm_unpin_pages(kvm, pfn, page_size >> PAGE_SHIFT);
			goto unmap_pages;
		}

		gfn += page_size >> PAGE_SHIFT;


	}

	return 0;

unmap_pages:
	kvm_iommu_put_pages(kvm, slot->base_gfn, gfn - slot->base_gfn);
	return r;
}

static int kvm_iommu_map_memslots(struct kvm *kvm)
{
	int idx, r = 0;
	struct kvm_memslots *slots;
	struct kvm_memory_slot *memslot;

	if (kvm->arch.iommu_noncoherent)
		kvm_arch_register_noncoherent_dma(kvm);

	idx = srcu_read_lock(&kvm->srcu);
	slots = kvm_memslots(kvm);

	kvm_for_each_memslot(memslot, slots) {
		r = kvm_iommu_map_pages(kvm, memslot);
		if (r)
			break;
	}
	srcu_read_unlock(&kvm->srcu, idx);

	return r;
}

int kvm_assign_device(struct kvm *kvm,
		      struct kvm_assigned_dev_kernel *assigned_dev)
{
	struct pci_dev *pdev = NULL;
	struct iommu_domain *domain = kvm->arch.iommu_domain;
	int r;
	bool noncoherent;

	/* check if iommu exists and in use */
	if (!domain)
		return 0;

	pdev = assigned_dev->dev;
	if (pdev == NULL)
		return -ENODEV;

	r = iommu_attach_device(domain, &pdev->dev);
	if (r) {
		dev_err(&pdev->dev, "kvm assign device failed ret %d", r);
		return r;
	}

	noncoherent = !iommu_capable(&pci_bus_type, IOMMU_CAP_CACHE_COHERENCY);

	/* Check if need to update IOMMU page table for guest memory */
	if (noncoherent != kvm->arch.iommu_noncoherent) {
		kvm_iommu_unmap_memslots(kvm);
		kvm->arch.iommu_noncoherent = noncoherent;
		r = kvm_iommu_map_memslots(kvm);
		if (r)
			goto out_unmap;
	}

	pci_set_dev_assigned(pdev);

	dev_info(&pdev->dev, "kvm assign device\n");

	return 0;
out_unmap:
	kvm_iommu_unmap_memslots(kvm);
	return r;
}

int kvm_deassign_device(struct kvm *kvm,
			struct kvm_assigned_dev_kernel *assigned_dev)
{
	struct iommu_domain *domain = kvm->arch.iommu_domain;
	struct pci_dev *pdev = NULL;

	/* check if iommu exists and in use */
	if (!domain)
		return 0;

	pdev = assigned_dev->dev;
	if (pdev == NULL)
		return -ENODEV;

	iommu_detach_device(domain, &pdev->dev);

	pci_clear_dev_assigned(pdev);

	dev_info(&pdev->dev, "kvm deassign device\n");

	return 0;
}

int kvm_iommu_map_guest(struct kvm *kvm)
{
	int r;

	if (!iommu_present(&pci_bus_type)) {
		printk(KERN_ERR "%s: iommu not found\n", __func__);
		return -ENODEV;
	}

	mutex_lock(&kvm->slots_lock);

	kvm->arch.iommu_domain = iommu_domain_alloc(&pci_bus_type);
	if (!kvm->arch.iommu_domain) {
		r = -ENOMEM;
		goto out_unlock;
	}

	if (!allow_unsafe_assigned_interrupts &&
	    !iommu_capable(&pci_bus_type, IOMMU_CAP_INTR_REMAP)) {
		printk(KERN_WARNING "%s: No interrupt remapping support,"
		       " disallowing device assignment."
		       " Re-enble with \"allow_unsafe_assigned_interrupts=1\""
		       " module option.\n", __func__);
		iommu_domain_free(kvm->arch.iommu_domain);
		kvm->arch.iommu_domain = NULL;
		r = -EPERM;
		goto out_unlock;
	}

	r = kvm_iommu_map_memslots(kvm);
	if (r)
		kvm_iommu_unmap_memslots(kvm);

out_unlock:
	mutex_unlock(&kvm->slots_lock);
	return r;
}

static void kvm_iommu_put_pages(struct kvm *kvm,
				gfn_t base_gfn, unsigned long npages)
{
	struct iommu_domain *domain;
	gfn_t end_gfn, gfn;
	pfn_t pfn;
	u64 phys;

	domain  = kvm->arch.iommu_domain;
	end_gfn = base_gfn + npages;
	gfn     = base_gfn;

	/* check if iommu exists and in use */
	if (!domain)
		return;

	while (gfn < end_gfn) {
		unsigned long unmap_pages;
		size_t size;

		/* Get physical address */
		phys = iommu_iova_to_phys(domain, gfn_to_gpa(gfn));

		if (!phys) {
			gfn++;
			continue;
		}

		pfn  = phys >> PAGE_SHIFT;

		/* Unmap address from IO address space */
		size       = iommu_unmap(domain, gfn_to_gpa(gfn), PAGE_SIZE);
		unmap_pages = 1ULL << get_order(size);

		/* Unpin all pages we just unmapped to not leak any memory */
		kvm_unpin_pages(kvm, pfn, unmap_pages);

		gfn += unmap_pages;
	}
}

void kvm_iommu_unmap_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
{
	kvm_iommu_put_pages(kvm, slot->base_gfn, slot->npages);
}

static int kvm_iommu_unmap_memslots(struct kvm *kvm)
{
	int idx;
	struct kvm_memslots *slots;
	struct kvm_memory_slot *memslot;

	idx = srcu_read_lock(&kvm->srcu);
	slots = kvm_memslots(kvm);

	kvm_for_each_memslot(memslot, slots)
		kvm_iommu_unmap_pages(kvm, memslot);

	srcu_read_unlock(&kvm->srcu, idx);

	if (kvm->arch.iommu_noncoherent)
		kvm_arch_unregister_noncoherent_dma(kvm);

	return 0;
}

int kvm_iommu_unmap_guest(struct kvm *kvm)
{
	struct iommu_domain *domain = kvm->arch.iommu_domain;

	/* check if iommu exists and in use */
	if (!domain)
		return 0;

	mutex_lock(&kvm->slots_lock);
	kvm_iommu_unmap_memslots(kvm);
	kvm->arch.iommu_domain = NULL;
	kvm->arch.iommu_noncoherent = false;
	mutex_unlock(&kvm->slots_lock);

	iommu_domain_free(domain);
	return 0;
}
Commit	Line	Data
62c476c7 BAY	1	/*
	2	* Copyright (c) 2006, Intel Corporation.
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms and conditions of the GNU General Public License,
	6	* version 2, as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	11	* more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along with
	14	* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
	15	* Place - Suite 330, Boston, MA 02111-1307 USA.
	16	*
	17	* Copyright (C) 2006-2008 Intel Corporation
	18	* Copyright IBM Corporation, 2008
221d059d AK	19	* Copyright 2010 Red Hat, Inc. and/or its affiliates.
221d059d AK	20	*
62c476c7 BAY	21	* Author: Allen M. Kay <allen.m.kay@intel.com>
	22	* Author: Weidong Han <weidong.han@intel.com>
	23	* Author: Ben-Ami Yassour <benami@il.ibm.com>
	24	*/
	25
	26	#include <linux/list.h>
	27	#include <linux/kvm_host.h>
51441d43	28	#include <linux/module.h>
62c476c7	29	#include <linux/pci.h>
799fd8b2	30	#include <linux/stat.h>
62c476c7	31	#include <linux/dmar.h>
19de40a8	32	#include <linux/iommu.h>
62c476c7 BAY	33	#include <linux/intel-iommu.h>
62c476c7 BAY	34
90ab5ee9	35	static bool allow_unsafe_assigned_interrupts;
3f68b031 AW	36	module_param_named(allow_unsafe_assigned_interrupts,
	37	allow_unsafe_assigned_interrupts, bool, S_IRUGO \| S_IWUSR);
	38	MODULE_PARM_DESC(allow_unsafe_assigned_interrupts,
	39	"Enable device assignment on platforms without interrupt remapping support.");
	40
62c476c7 BAY	41	static int kvm_iommu_unmap_memslots(struct kvm *kvm);
	42	static void kvm_iommu_put_pages(struct kvm *kvm,
	43	gfn_t base_gfn, unsigned long npages);
	44
d5661048	45	static pfn_t kvm_pin_pages(struct kvm_memory_slot *slot, gfn_t gfn,
3d32e4db	46	unsigned long npages)
fcd95807 JR	47	{
	48	gfn_t end_gfn;
	49	pfn_t pfn;
	50
d5661048	51	pfn = gfn_to_pfn_memslot(slot, gfn);
3d32e4db	52	end_gfn = gfn + npages;
fcd95807 JR	53	gfn += 1;
fcd95807 JR	54
81c52c56	55	if (is_error_noslot_pfn(pfn))
fcd95807 JR	56	return pfn;
	57
	58	while (gfn < end_gfn)
d5661048	59	gfn_to_pfn_memslot(slot, gfn++);
fcd95807 JR	60
	61	return pfn;
	62	}
	63
350b8bdd MT	64	static void kvm_unpin_pages(struct kvm *kvm, pfn_t pfn, unsigned long npages)
	65	{
	66	unsigned long i;
	67
	68	for (i = 0; i < npages; ++i)
	69	kvm_release_pfn_clean(pfn + i);
	70	}
	71
3ad26d81	72	int kvm_iommu_map_pages(struct kvm kvm, struct kvm_memory_slot slot)
62c476c7	73	{
fcd95807	74	gfn_t gfn, end_gfn;
62c476c7	75	pfn_t pfn;
fcd95807	76	int r = 0;
19de40a8	77	struct iommu_domain *domain = kvm->arch.iommu_domain;
522c68c4	78	int flags;
62c476c7 BAY	79
	80	/* check if iommu exists and in use */
	81	if (!domain)
	82	return 0;
	83
fcd95807 JR	84	gfn = slot->base_gfn;
	85	end_gfn = gfn + slot->npages;
	86
d47510e2 AW	87	flags = IOMMU_READ;
	88	if (!(slot->flags & KVM_MEM_READONLY))
	89	flags \|= IOMMU_WRITE;
d96eb2c6	90	if (!kvm->arch.iommu_noncoherent)
522c68c4 SY	91	flags \|= IOMMU_CACHE;
522c68c4 SY	92
fcd95807 JR	93
	94	while (gfn < end_gfn) {
	95	unsigned long page_size;
	96
	97	/* Check if already mapped */
	98	if (iommu_iova_to_phys(domain, gfn_to_gpa(gfn))) {
	99	gfn += 1;
	100	continue;
	101	}
	102
	103	/* Get the page size we could use to map */
	104	page_size = kvm_host_page_size(kvm, gfn);
	105
	106	/* Make sure the page_size does not exceed the memslot */
	107	while ((gfn + (page_size >> PAGE_SHIFT)) > end_gfn)
	108	page_size >>= 1;
	109
	110	/* Make sure gfn is aligned to the page size we want to map */
	111	while ((gfn << PAGE_SHIFT) & (page_size - 1))
	112	page_size >>= 1;
	113
27ef63c7 GE	114	/* Make sure hva is aligned to the page size we want to map */
	115	while (__gfn_to_hva_memslot(slot, gfn) & (page_size - 1))
	116	page_size >>= 1;
	117
fcd95807 JR	118	/*
	119	* Pin all pages we are about to map in memory. This is
	120	* important because we unmap and unpin in 4kb steps later.
	121	*/
3d32e4db	122	pfn = kvm_pin_pages(slot, gfn, page_size >> PAGE_SHIFT);
81c52c56	123	if (is_error_noslot_pfn(pfn)) {
fcd95807	124	gfn += 1;
62c476c7	125	continue;
fcd95807	126	}
62c476c7	127
fcd95807 JR	128	/* Map into IO address space */
fcd95807 JR	129	r = iommu_map(domain, gfn_to_gpa(gfn), pfn_to_hpa(pfn),
7d3002cc	130	page_size, flags);
e5fcfc82	131	if (r) {
260782bc	132	printk(KERN_ERR "kvm_iommu_map_address:"
5689cc53	133	"iommu failed to map pfn=%llx\n", pfn);
3d32e4db	134	kvm_unpin_pages(kvm, pfn, page_size >> PAGE_SHIFT);
62c476c7 BAY	135	goto unmap_pages;
62c476c7 BAY	136	}
fcd95807 JR	137
	138	gfn += page_size >> PAGE_SHIFT;
	139
	140
62c476c7	141	}
fcd95807	142
62c476c7 BAY	143	return 0;
	144
	145	unmap_pages:
350b8bdd	146	kvm_iommu_put_pages(kvm, slot->base_gfn, gfn - slot->base_gfn);
62c476c7 BAY	147	return r;
	148	}
	149
	150	static int kvm_iommu_map_memslots(struct kvm *kvm)
	151	{
be6ba0f0	152	int idx, r = 0;
46a26bf5	153	struct kvm_memslots *slots;
be6ba0f0	154	struct kvm_memory_slot *memslot;
62c476c7	155
e0f0bbc5 AW	156	if (kvm->arch.iommu_noncoherent)
	157	kvm_arch_register_noncoherent_dma(kvm);
	158
95c87e2b	159	idx = srcu_read_lock(&kvm->srcu);
90d83dc3	160	slots = kvm_memslots(kvm);
46a26bf5	161
be6ba0f0 XG	162	kvm_for_each_memslot(memslot, slots) {
be6ba0f0 XG	163	r = kvm_iommu_map_pages(kvm, memslot);
62c476c7 BAY	164	if (r)
	165	break;
	166	}
95c87e2b	167	srcu_read_unlock(&kvm->srcu, idx);
682edb4c	168
62c476c7 BAY	169	return r;
	170	}
	171
260782bc WH	172	int kvm_assign_device(struct kvm *kvm,
260782bc WH	173	struct kvm_assigned_dev_kernel *assigned_dev)
62c476c7 BAY	174	{
62c476c7 BAY	175	struct pci_dev *pdev = NULL;
19de40a8	176	struct iommu_domain *domain = kvm->arch.iommu_domain;
d96eb2c6 AW	177	int r;
d96eb2c6 AW	178	bool noncoherent;
62c476c7	179
260782bc WH	180	/* check if iommu exists and in use */
	181	if (!domain)
	182	return 0;
	183
	184	pdev = assigned_dev->dev;
	185	if (pdev == NULL)
62c476c7	186	return -ENODEV;
260782bc	187
19de40a8	188	r = iommu_attach_device(domain, &pdev->dev);
260782bc	189	if (r) {
d151f63f	190	dev_err(&pdev->dev, "kvm assign device failed ret %d", r);
260782bc	191	return r;
62c476c7 BAY	192	}
62c476c7 BAY	193
ee5ba30f	194	noncoherent = !iommu_capable(&pci_bus_type, IOMMU_CAP_CACHE_COHERENCY);
522c68c4 SY	195
522c68c4 SY	196	/* Check if need to update IOMMU page table for guest memory */
d96eb2c6	197	if (noncoherent != kvm->arch.iommu_noncoherent) {
522c68c4	198	kvm_iommu_unmap_memslots(kvm);
d96eb2c6	199	kvm->arch.iommu_noncoherent = noncoherent;
522c68c4 SY	200	r = kvm_iommu_map_memslots(kvm);
	201	if (r)
	202	goto out_unmap;
	203	}
	204
ad0d217c	205	pci_set_dev_assigned(pdev);
6777829c	206
29242cb5	207	dev_info(&pdev->dev, "kvm assign device\n");
62c476c7	208
260782bc	209	return 0;
522c68c4 SY	210	out_unmap:
	211	kvm_iommu_unmap_memslots(kvm);
	212	return r;
260782bc	213	}
62c476c7	214
0a920356 WH	215	int kvm_deassign_device(struct kvm *kvm,
	216	struct kvm_assigned_dev_kernel *assigned_dev)
	217	{
19de40a8	218	struct iommu_domain *domain = kvm->arch.iommu_domain;
0a920356 WH	219	struct pci_dev *pdev = NULL;
	220
	221	/* check if iommu exists and in use */
	222	if (!domain)
	223	return 0;
	224
	225	pdev = assigned_dev->dev;
	226	if (pdev == NULL)
	227	return -ENODEV;
	228
19de40a8	229	iommu_detach_device(domain, &pdev->dev);
0a920356	230
ad0d217c	231	pci_clear_dev_assigned(pdev);
6777829c	232
29242cb5	233	dev_info(&pdev->dev, "kvm deassign device\n");
0a920356 WH	234
	235	return 0;
	236	}
	237
260782bc WH	238	int kvm_iommu_map_guest(struct kvm *kvm)
	239	{
	240	int r;
	241
a1b60c1c	242	if (!iommu_present(&pci_bus_type)) {
19de40a8	243	printk(KERN_ERR "%s: iommu not found\n", __func__);
62c476c7 BAY	244	return -ENODEV;
	245	}
	246
21a1416a AW	247	mutex_lock(&kvm->slots_lock);
21a1416a AW	248
905d66c1	249	kvm->arch.iommu_domain = iommu_domain_alloc(&pci_bus_type);
21a1416a AW	250	if (!kvm->arch.iommu_domain) {
	251	r = -ENOMEM;
	252	goto out_unlock;
	253	}
62c476c7	254
3f68b031	255	if (!allow_unsafe_assigned_interrupts &&
ee5ba30f	256	!iommu_capable(&pci_bus_type, IOMMU_CAP_INTR_REMAP)) {
3f68b031 AW	257	printk(KERN_WARNING "%s: No interrupt remapping support,"
	258	" disallowing device assignment."
	259	" Re-enble with \"allow_unsafe_assigned_interrupts=1\""
	260	" module option.\n", __func__);
	261	iommu_domain_free(kvm->arch.iommu_domain);
	262	kvm->arch.iommu_domain = NULL;
21a1416a AW	263	r = -EPERM;
21a1416a AW	264	goto out_unlock;
3f68b031 AW	265	}
3f68b031 AW	266
62c476c7 BAY	267	r = kvm_iommu_map_memslots(kvm);
62c476c7 BAY	268	if (r)
21a1416a	269	kvm_iommu_unmap_memslots(kvm);
62c476c7	270
21a1416a AW	271	out_unlock:
21a1416a AW	272	mutex_unlock(&kvm->slots_lock);
62c476c7 BAY	273	return r;
	274	}
	275
	276	static void kvm_iommu_put_pages(struct kvm *kvm,
260782bc	277	gfn_t base_gfn, unsigned long npages)
62c476c7	278	{
fcd95807 JR	279	struct iommu_domain *domain;
fcd95807 JR	280	gfn_t end_gfn, gfn;
62c476c7	281	pfn_t pfn;
260782bc WH	282	u64 phys;
260782bc WH	283
fcd95807 JR	284	domain = kvm->arch.iommu_domain;
	285	end_gfn = base_gfn + npages;
	286	gfn = base_gfn;
	287
260782bc WH	288	/* check if iommu exists and in use */
	289	if (!domain)
	290	return;
62c476c7	291
fcd95807 JR	292	while (gfn < end_gfn) {
fcd95807 JR	293	unsigned long unmap_pages;
7d3002cc	294	size_t size;
fcd95807 JR	295
fcd95807 JR	296	/* Get physical address */
19de40a8	297	phys = iommu_iova_to_phys(domain, gfn_to_gpa(gfn));
16b854c8 XG	298
	299	if (!phys) {
	300	gfn++;
	301	continue;
	302	}
	303
fcd95807 JR	304	pfn = phys >> PAGE_SHIFT;
	305
	306	/* Unmap address from IO address space */
7d3002cc OBC	307	size = iommu_unmap(domain, gfn_to_gpa(gfn), PAGE_SIZE);
7d3002cc OBC	308	unmap_pages = 1ULL << get_order(size);
260782bc	309
fcd95807 JR	310	/* Unpin all pages we just unmapped to not leak any memory */
	311	kvm_unpin_pages(kvm, pfn, unmap_pages);
	312
	313	gfn += unmap_pages;
	314	}
62c476c7 BAY	315	}
62c476c7 BAY	316
32f6daad AW	317	void kvm_iommu_unmap_pages(struct kvm kvm, struct kvm_memory_slot slot)
	318	{
	319	kvm_iommu_put_pages(kvm, slot->base_gfn, slot->npages);
	320	}
	321
62c476c7 BAY	322	static int kvm_iommu_unmap_memslots(struct kvm *kvm)
62c476c7 BAY	323	{
be6ba0f0	324	int idx;
46a26bf5	325	struct kvm_memslots *slots;
be6ba0f0	326	struct kvm_memory_slot *memslot;
46a26bf5	327
95c87e2b	328	idx = srcu_read_lock(&kvm->srcu);
90d83dc3	329	slots = kvm_memslots(kvm);
682edb4c	330
be6ba0f0	331	kvm_for_each_memslot(memslot, slots)
32f6daad	332	kvm_iommu_unmap_pages(kvm, memslot);
be6ba0f0	333
95c87e2b	334	srcu_read_unlock(&kvm->srcu, idx);
62c476c7	335
e0f0bbc5 AW	336	if (kvm->arch.iommu_noncoherent)
	337	kvm_arch_unregister_noncoherent_dma(kvm);
	338
62c476c7 BAY	339	return 0;
	340	}
	341
	342	int kvm_iommu_unmap_guest(struct kvm *kvm)
	343	{
19de40a8	344	struct iommu_domain *domain = kvm->arch.iommu_domain;
62c476c7 BAY	345
	346	/* check if iommu exists and in use */
	347	if (!domain)
	348	return 0;
	349
21a1416a	350	mutex_lock(&kvm->slots_lock);
62c476c7	351	kvm_iommu_unmap_memslots(kvm);
21a1416a	352	kvm->arch.iommu_domain = NULL;
d96eb2c6	353	kvm->arch.iommu_noncoherent = false;
21a1416a AW	354	mutex_unlock(&kvm->slots_lock);
21a1416a AW	355
19de40a8	356	iommu_domain_free(domain);
62c476c7 BAY	357	return 0;
62c476c7 BAY	358	}