[mirror_ubuntu-bionic-kernel.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 size)
{
	gfn_t end_gfn;
	pfn_t pfn;

	pfn     = gfn_to_pfn_memslot(slot, gfn);
	end_gfn = gfn + (size >> PAGE_SHIFT);
	gfn    += 1;

	if (is_error_noslot_pfn(pfn))
		return pfn;

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

	return pfn;
}

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);
		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);
			goto unmap_pages;
		}

		gfn += page_size >> PAGE_SHIFT;


	}

	return 0;

unmap_pages:
	kvm_iommu_put_pages(kvm, slot->base_gfn, 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_domain_has_cap(kvm->arch.iommu_domain,
					    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;
	}

	pdev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED;

	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);

	pdev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;

	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_domain_has_cap(kvm->arch.iommu_domain,
				  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_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);
}

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 XG	45	static pfn_t kvm_pin_pages(struct kvm_memory_slot *slot, gfn_t gfn,
d5661048 XG	46	unsigned long size)
fcd95807 JR	47	{
	48	gfn_t end_gfn;
	49	pfn_t pfn;
	50
d5661048	51	pfn = gfn_to_pfn_memslot(slot, gfn);
fcd95807 JR	52	end_gfn = gfn + (size >> PAGE_SHIFT);
	53	gfn += 1;
	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
3ad26d81	64	int kvm_iommu_map_pages(struct kvm kvm, struct kvm_memory_slot slot)
62c476c7	65	{
fcd95807	66	gfn_t gfn, end_gfn;
62c476c7	67	pfn_t pfn;
fcd95807	68	int r = 0;
19de40a8	69	struct iommu_domain *domain = kvm->arch.iommu_domain;
522c68c4	70	int flags;
62c476c7 BAY	71
	72	/* check if iommu exists and in use */
	73	if (!domain)
	74	return 0;
	75
fcd95807 JR	76	gfn = slot->base_gfn;
	77	end_gfn = gfn + slot->npages;
	78
d47510e2 AW	79	flags = IOMMU_READ;
	80	if (!(slot->flags & KVM_MEM_READONLY))
	81	flags \|= IOMMU_WRITE;
d96eb2c6	82	if (!kvm->arch.iommu_noncoherent)
522c68c4 SY	83	flags \|= IOMMU_CACHE;
522c68c4 SY	84
fcd95807 JR	85
	86	while (gfn < end_gfn) {
	87	unsigned long page_size;
	88
	89	/* Check if already mapped */
	90	if (iommu_iova_to_phys(domain, gfn_to_gpa(gfn))) {
	91	gfn += 1;
	92	continue;
	93	}
	94
	95	/* Get the page size we could use to map */
	96	page_size = kvm_host_page_size(kvm, gfn);
	97
	98	/* Make sure the page_size does not exceed the memslot */
	99	while ((gfn + (page_size >> PAGE_SHIFT)) > end_gfn)
	100	page_size >>= 1;
	101
	102	/* Make sure gfn is aligned to the page size we want to map */
	103	while ((gfn << PAGE_SHIFT) & (page_size - 1))
	104	page_size >>= 1;
	105
27ef63c7 GE	106	/* Make sure hva is aligned to the page size we want to map */
	107	while (__gfn_to_hva_memslot(slot, gfn) & (page_size - 1))
	108	page_size >>= 1;
	109
fcd95807 JR	110	/*
	111	* Pin all pages we are about to map in memory. This is
	112	* important because we unmap and unpin in 4kb steps later.
	113	*/
d5661048	114	pfn = kvm_pin_pages(slot, gfn, page_size);
81c52c56	115	if (is_error_noslot_pfn(pfn)) {
fcd95807	116	gfn += 1;
62c476c7	117	continue;
fcd95807	118	}
62c476c7	119
fcd95807 JR	120	/* Map into IO address space */
fcd95807 JR	121	r = iommu_map(domain, gfn_to_gpa(gfn), pfn_to_hpa(pfn),
7d3002cc	122	page_size, flags);
e5fcfc82	123	if (r) {
260782bc	124	printk(KERN_ERR "kvm_iommu_map_address:"
5689cc53	125	"iommu failed to map pfn=%llx\n", pfn);
62c476c7 BAY	126	goto unmap_pages;
62c476c7 BAY	127	}
fcd95807 JR	128
	129	gfn += page_size >> PAGE_SHIFT;
	130
	131
62c476c7	132	}
fcd95807	133
62c476c7 BAY	134	return 0;
	135
	136	unmap_pages:
fcd95807	137	kvm_iommu_put_pages(kvm, slot->base_gfn, gfn);
62c476c7 BAY	138	return r;
	139	}
	140
	141	static int kvm_iommu_map_memslots(struct kvm *kvm)
	142	{
be6ba0f0	143	int idx, r = 0;
46a26bf5	144	struct kvm_memslots *slots;
be6ba0f0	145	struct kvm_memory_slot *memslot;
62c476c7	146
e0f0bbc5 AW	147	if (kvm->arch.iommu_noncoherent)
	148	kvm_arch_register_noncoherent_dma(kvm);
	149
95c87e2b	150	idx = srcu_read_lock(&kvm->srcu);
90d83dc3	151	slots = kvm_memslots(kvm);
46a26bf5	152
be6ba0f0 XG	153	kvm_for_each_memslot(memslot, slots) {
be6ba0f0 XG	154	r = kvm_iommu_map_pages(kvm, memslot);
62c476c7 BAY	155	if (r)
	156	break;
	157	}
95c87e2b	158	srcu_read_unlock(&kvm->srcu, idx);
682edb4c	159
62c476c7 BAY	160	return r;
	161	}
	162
260782bc WH	163	int kvm_assign_device(struct kvm *kvm,
260782bc WH	164	struct kvm_assigned_dev_kernel *assigned_dev)
62c476c7 BAY	165	{
62c476c7 BAY	166	struct pci_dev *pdev = NULL;
19de40a8	167	struct iommu_domain *domain = kvm->arch.iommu_domain;
d96eb2c6 AW	168	int r;
d96eb2c6 AW	169	bool noncoherent;
62c476c7	170
260782bc WH	171	/* check if iommu exists and in use */
	172	if (!domain)
	173	return 0;
	174
	175	pdev = assigned_dev->dev;
	176	if (pdev == NULL)
62c476c7	177	return -ENODEV;
260782bc	178
19de40a8	179	r = iommu_attach_device(domain, &pdev->dev);
260782bc	180	if (r) {
d151f63f	181	dev_err(&pdev->dev, "kvm assign device failed ret %d", r);
260782bc	182	return r;
62c476c7 BAY	183	}
62c476c7 BAY	184
d96eb2c6 AW	185	noncoherent = !iommu_domain_has_cap(kvm->arch.iommu_domain,
d96eb2c6 AW	186	IOMMU_CAP_CACHE_COHERENCY);
522c68c4 SY	187
522c68c4 SY	188	/* Check if need to update IOMMU page table for guest memory */
d96eb2c6	189	if (noncoherent != kvm->arch.iommu_noncoherent) {
522c68c4	190	kvm_iommu_unmap_memslots(kvm);
d96eb2c6	191	kvm->arch.iommu_noncoherent = noncoherent;
522c68c4 SY	192	r = kvm_iommu_map_memslots(kvm);
	193	if (r)
	194	goto out_unmap;
	195	}
	196
6777829c GR	197	pdev->dev_flags \|= PCI_DEV_FLAGS_ASSIGNED;
6777829c GR	198
29242cb5	199	dev_info(&pdev->dev, "kvm assign device\n");
62c476c7	200
260782bc	201	return 0;
522c68c4 SY	202	out_unmap:
	203	kvm_iommu_unmap_memslots(kvm);
	204	return r;
260782bc	205	}
62c476c7	206
0a920356 WH	207	int kvm_deassign_device(struct kvm *kvm,
	208	struct kvm_assigned_dev_kernel *assigned_dev)
	209	{
19de40a8	210	struct iommu_domain *domain = kvm->arch.iommu_domain;
0a920356 WH	211	struct pci_dev *pdev = NULL;
	212
	213	/* check if iommu exists and in use */
	214	if (!domain)
	215	return 0;
	216
	217	pdev = assigned_dev->dev;
	218	if (pdev == NULL)
	219	return -ENODEV;
	220
19de40a8	221	iommu_detach_device(domain, &pdev->dev);
0a920356	222
6777829c GR	223	pdev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
6777829c GR	224
29242cb5	225	dev_info(&pdev->dev, "kvm deassign device\n");
0a920356 WH	226
	227	return 0;
	228	}
	229
260782bc WH	230	int kvm_iommu_map_guest(struct kvm *kvm)
	231	{
	232	int r;
	233
a1b60c1c	234	if (!iommu_present(&pci_bus_type)) {
19de40a8	235	printk(KERN_ERR "%s: iommu not found\n", __func__);
62c476c7 BAY	236	return -ENODEV;
	237	}
	238
21a1416a AW	239	mutex_lock(&kvm->slots_lock);
21a1416a AW	240
905d66c1	241	kvm->arch.iommu_domain = iommu_domain_alloc(&pci_bus_type);
21a1416a AW	242	if (!kvm->arch.iommu_domain) {
	243	r = -ENOMEM;
	244	goto out_unlock;
	245	}
62c476c7	246
3f68b031 AW	247	if (!allow_unsafe_assigned_interrupts &&
	248	!iommu_domain_has_cap(kvm->arch.iommu_domain,
	249	IOMMU_CAP_INTR_REMAP)) {
	250	printk(KERN_WARNING "%s: No interrupt remapping support,"
	251	" disallowing device assignment."
	252	" Re-enble with \"allow_unsafe_assigned_interrupts=1\""
	253	" module option.\n", __func__);
	254	iommu_domain_free(kvm->arch.iommu_domain);
	255	kvm->arch.iommu_domain = NULL;
21a1416a AW	256	r = -EPERM;
21a1416a AW	257	goto out_unlock;
3f68b031 AW	258	}
3f68b031 AW	259
62c476c7 BAY	260	r = kvm_iommu_map_memslots(kvm);
62c476c7 BAY	261	if (r)
21a1416a	262	kvm_iommu_unmap_memslots(kvm);
62c476c7	263
21a1416a AW	264	out_unlock:
21a1416a AW	265	mutex_unlock(&kvm->slots_lock);
62c476c7 BAY	266	return r;
	267	}
	268
fcd95807 JR	269	static void kvm_unpin_pages(struct kvm *kvm, pfn_t pfn, unsigned long npages)
	270	{
	271	unsigned long i;
	272
	273	for (i = 0; i < npages; ++i)
	274	kvm_release_pfn_clean(pfn + i);
	275	}
	276
62c476c7	277	static void kvm_iommu_put_pages(struct kvm *kvm,
260782bc	278	gfn_t base_gfn, unsigned long npages)
62c476c7	279	{
fcd95807 JR	280	struct iommu_domain *domain;
fcd95807 JR	281	gfn_t end_gfn, gfn;
62c476c7	282	pfn_t pfn;
260782bc WH	283	u64 phys;
260782bc WH	284
fcd95807 JR	285	domain = kvm->arch.iommu_domain;
	286	end_gfn = base_gfn + npages;
	287	gfn = base_gfn;
	288
260782bc WH	289	/* check if iommu exists and in use */
	290	if (!domain)
	291	return;
62c476c7	292
fcd95807 JR	293	while (gfn < end_gfn) {
fcd95807 JR	294	unsigned long unmap_pages;
7d3002cc	295	size_t size;
fcd95807 JR	296
fcd95807 JR	297	/* Get physical address */
19de40a8	298	phys = iommu_iova_to_phys(domain, gfn_to_gpa(gfn));
16b854c8 XG	299
	300	if (!phys) {
	301	gfn++;
	302	continue;
	303	}
	304
fcd95807 JR	305	pfn = phys >> PAGE_SHIFT;
	306
	307	/* Unmap address from IO address space */
7d3002cc OBC	308	size = iommu_unmap(domain, gfn_to_gpa(gfn), PAGE_SIZE);
7d3002cc OBC	309	unmap_pages = 1ULL << get_order(size);
260782bc	310
fcd95807 JR	311	/* Unpin all pages we just unmapped to not leak any memory */
	312	kvm_unpin_pages(kvm, pfn, unmap_pages);
	313
	314	gfn += unmap_pages;
	315	}
62c476c7 BAY	316	}
62c476c7 BAY	317
32f6daad AW	318	void kvm_iommu_unmap_pages(struct kvm kvm, struct kvm_memory_slot slot)
	319	{
	320	kvm_iommu_put_pages(kvm, slot->base_gfn, slot->npages);
	321	}
	322
62c476c7 BAY	323	static int kvm_iommu_unmap_memslots(struct kvm *kvm)
62c476c7 BAY	324	{
be6ba0f0	325	int idx;
46a26bf5	326	struct kvm_memslots *slots;
be6ba0f0	327	struct kvm_memory_slot *memslot;
46a26bf5	328
95c87e2b	329	idx = srcu_read_lock(&kvm->srcu);
90d83dc3	330	slots = kvm_memslots(kvm);
682edb4c	331
be6ba0f0	332	kvm_for_each_memslot(memslot, slots)
32f6daad	333	kvm_iommu_unmap_pages(kvm, memslot);
be6ba0f0	334
95c87e2b	335	srcu_read_unlock(&kvm->srcu, idx);
62c476c7	336
e0f0bbc5 AW	337	if (kvm->arch.iommu_noncoherent)
	338	kvm_arch_unregister_noncoherent_dma(kvm);
	339
62c476c7 BAY	340	return 0;
	341	}
	342
	343	int kvm_iommu_unmap_guest(struct kvm *kvm)
	344	{
19de40a8	345	struct iommu_domain *domain = kvm->arch.iommu_domain;
62c476c7 BAY	346
	347	/* check if iommu exists and in use */
	348	if (!domain)
	349	return 0;
	350
21a1416a	351	mutex_lock(&kvm->slots_lock);
62c476c7	352	kvm_iommu_unmap_memslots(kvm);
21a1416a	353	kvm->arch.iommu_domain = NULL;
d96eb2c6	354	kvm->arch.iommu_noncoherent = false;
21a1416a AW	355	mutex_unlock(&kvm->slots_lock);
21a1416a AW	356
19de40a8	357	iommu_domain_free(domain);
62c476c7 BAY	358	return 0;
62c476c7 BAY	359	}