[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 int 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 *kvm, struct kvm_memory_slot *slot,
			   gfn_t gfn, unsigned long size)
{
	gfn_t end_gfn;
	pfn_t pfn;

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

	if (is_error_pfn(pfn))
		return pfn;

	while (gfn < end_gfn)
		gfn_to_pfn_memslot(kvm, 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 | IOMMU_WRITE;
	if (kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY)
		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;

		/*
		 * 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(kvm, slot, gfn, page_size);
		if (is_error_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;

	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, last_flags;

	/* 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) {
		printk(KERN_ERR "assign device %x:%x:%x.%x failed",
			pci_domain_nr(pdev->bus),
			pdev->bus->number,
			PCI_SLOT(pdev->devfn),
			PCI_FUNC(pdev->devfn));
		return r;
	}

	last_flags = kvm->arch.iommu_flags;
	if (iommu_domain_has_cap(kvm->arch.iommu_domain,
				 IOMMU_CAP_CACHE_COHERENCY))
		kvm->arch.iommu_flags |= KVM_IOMMU_CACHE_COHERENCY;

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

	pdev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED;

	printk(KERN_DEBUG "assign device %x:%x:%x.%x\n",
		assigned_dev->host_segnr,
		assigned_dev->host_busnr,
		PCI_SLOT(assigned_dev->host_devfn),
		PCI_FUNC(assigned_dev->host_devfn));

	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;

	printk(KERN_DEBUG "deassign device %x:%x:%x.%x\n",
		assigned_dev->host_segnr,
		assigned_dev->host_busnr,
		PCI_SLOT(assigned_dev->host_devfn),
		PCI_FUNC(assigned_dev->host_devfn));

	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;
	}

	kvm->arch.iommu_domain = iommu_domain_alloc(&pci_bus_type);
	if (!kvm->arch.iommu_domain)
		return -ENOMEM;

	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;
		return -EPERM;
	}

	r = kvm_iommu_map_memslots(kvm);
	if (r)
		goto out_unmap;

	return 0;

out_unmap:
	kvm_iommu_unmap_memslots(kvm);
	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));
		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;
	}
}

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_put_pages(kvm, memslot->base_gfn, memslot->npages);

	srcu_read_unlock(&kvm->srcu, idx);

	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;

	kvm_iommu_unmap_memslots(kvm);
	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
3f68b031 AW	35	static int allow_unsafe_assigned_interrupts;
	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
fcd95807 JR	45	static pfn_t kvm_pin_pages(struct kvm kvm, struct kvm_memory_slot slot,
	46	gfn_t gfn, unsigned long size)
	47	{
	48	gfn_t end_gfn;
	49	pfn_t pfn;
	50
	51	pfn = gfn_to_pfn_memslot(kvm, slot, gfn);
	52	end_gfn = gfn + (size >> PAGE_SHIFT);
	53	gfn += 1;
	54
	55	if (is_error_pfn(pfn))
	56	return pfn;
	57
	58	while (gfn < end_gfn)
	59	gfn_to_pfn_memslot(kvm, slot, gfn++);
	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
522c68c4 SY	79	flags = IOMMU_READ \| IOMMU_WRITE;
	80	if (kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY)
	81	flags \|= IOMMU_CACHE;
	82
fcd95807 JR	83
	84	while (gfn < end_gfn) {
	85	unsigned long page_size;
	86
	87	/* Check if already mapped */
	88	if (iommu_iova_to_phys(domain, gfn_to_gpa(gfn))) {
	89	gfn += 1;
	90	continue;
	91	}
	92
	93	/* Get the page size we could use to map */
	94	page_size = kvm_host_page_size(kvm, gfn);
	95
	96	/* Make sure the page_size does not exceed the memslot */
	97	while ((gfn + (page_size >> PAGE_SHIFT)) > end_gfn)
	98	page_size >>= 1;
	99
	100	/* Make sure gfn is aligned to the page size we want to map */
	101	while ((gfn << PAGE_SHIFT) & (page_size - 1))
	102	page_size >>= 1;
	103
	104	/*
	105	* Pin all pages we are about to map in memory. This is
	106	* important because we unmap and unpin in 4kb steps later.
	107	*/
	108	pfn = kvm_pin_pages(kvm, slot, gfn, page_size);
	109	if (is_error_pfn(pfn)) {
	110	gfn += 1;
62c476c7	111	continue;
fcd95807	112	}
62c476c7	113
fcd95807 JR	114	/* Map into IO address space */
fcd95807 JR	115	r = iommu_map(domain, gfn_to_gpa(gfn), pfn_to_hpa(pfn),
7d3002cc	116	page_size, flags);
e5fcfc82	117	if (r) {
260782bc	118	printk(KERN_ERR "kvm_iommu_map_address:"
5689cc53	119	"iommu failed to map pfn=%llx\n", pfn);
62c476c7 BAY	120	goto unmap_pages;
62c476c7 BAY	121	}
fcd95807 JR	122
	123	gfn += page_size >> PAGE_SHIFT;
	124
	125
62c476c7	126	}
fcd95807	127
62c476c7 BAY	128	return 0;
	129
	130	unmap_pages:
fcd95807	131	kvm_iommu_put_pages(kvm, slot->base_gfn, gfn);
62c476c7 BAY	132	return r;
	133	}
	134
	135	static int kvm_iommu_map_memslots(struct kvm *kvm)
	136	{
be6ba0f0	137	int idx, r = 0;
46a26bf5	138	struct kvm_memslots *slots;
be6ba0f0	139	struct kvm_memory_slot *memslot;
62c476c7	140
95c87e2b	141	idx = srcu_read_lock(&kvm->srcu);
90d83dc3	142	slots = kvm_memslots(kvm);
46a26bf5	143
be6ba0f0 XG	144	kvm_for_each_memslot(memslot, slots) {
be6ba0f0 XG	145	r = kvm_iommu_map_pages(kvm, memslot);
62c476c7 BAY	146	if (r)
	147	break;
	148	}
95c87e2b	149	srcu_read_unlock(&kvm->srcu, idx);
682edb4c	150
62c476c7 BAY	151	return r;
	152	}
	153
260782bc WH	154	int kvm_assign_device(struct kvm *kvm,
260782bc WH	155	struct kvm_assigned_dev_kernel *assigned_dev)
62c476c7 BAY	156	{
62c476c7 BAY	157	struct pci_dev *pdev = NULL;
19de40a8	158	struct iommu_domain *domain = kvm->arch.iommu_domain;
522c68c4	159	int r, last_flags;
62c476c7	160
260782bc WH	161	/* check if iommu exists and in use */
	162	if (!domain)
	163	return 0;
	164
	165	pdev = assigned_dev->dev;
	166	if (pdev == NULL)
62c476c7	167	return -ENODEV;
260782bc	168
19de40a8	169	r = iommu_attach_device(domain, &pdev->dev);
260782bc	170	if (r) {
ab9f4ecb ZE	171	printk(KERN_ERR "assign device %x:%x:%x.%x failed",
ab9f4ecb ZE	172	pci_domain_nr(pdev->bus),
260782bc WH	173	pdev->bus->number,
	174	PCI_SLOT(pdev->devfn),
	175	PCI_FUNC(pdev->devfn));
	176	return r;
62c476c7 BAY	177	}
62c476c7 BAY	178
522c68c4 SY	179	last_flags = kvm->arch.iommu_flags;
	180	if (iommu_domain_has_cap(kvm->arch.iommu_domain,
	181	IOMMU_CAP_CACHE_COHERENCY))
	182	kvm->arch.iommu_flags \|= KVM_IOMMU_CACHE_COHERENCY;
	183
	184	/* Check if need to update IOMMU page table for guest memory */
	185	if ((last_flags ^ kvm->arch.iommu_flags) ==
	186	KVM_IOMMU_CACHE_COHERENCY) {
	187	kvm_iommu_unmap_memslots(kvm);
	188	r = kvm_iommu_map_memslots(kvm);
	189	if (r)
	190	goto out_unmap;
	191	}
	192
6777829c GR	193	pdev->dev_flags \|= PCI_DEV_FLAGS_ASSIGNED;
6777829c GR	194
ab9f4ecb ZE	195	printk(KERN_DEBUG "assign device %x:%x:%x.%x\n",
ab9f4ecb ZE	196	assigned_dev->host_segnr,
260782bc WH	197	assigned_dev->host_busnr,
	198	PCI_SLOT(assigned_dev->host_devfn),
	199	PCI_FUNC(assigned_dev->host_devfn));
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
ab9f4ecb ZE	225	printk(KERN_DEBUG "deassign device %x:%x:%x.%x\n",
ab9f4ecb ZE	226	assigned_dev->host_segnr,
0a920356 WH	227	assigned_dev->host_busnr,
	228	PCI_SLOT(assigned_dev->host_devfn),
	229	PCI_FUNC(assigned_dev->host_devfn));
	230
	231	return 0;
	232	}
	233
260782bc WH	234	int kvm_iommu_map_guest(struct kvm *kvm)
	235	{
	236	int r;
	237
a1b60c1c	238	if (!iommu_present(&pci_bus_type)) {
19de40a8	239	printk(KERN_ERR "%s: iommu not found\n", __func__);
62c476c7 BAY	240	return -ENODEV;
	241	}
	242
905d66c1	243	kvm->arch.iommu_domain = iommu_domain_alloc(&pci_bus_type);
19de40a8	244	if (!kvm->arch.iommu_domain)
260782bc	245	return -ENOMEM;
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;
	256	return -EPERM;
	257	}
	258
62c476c7 BAY	259	r = kvm_iommu_map_memslots(kvm);
	260	if (r)
	261	goto out_unmap;
	262
62c476c7 BAY	263	return 0;
	264
	265	out_unmap:
	266	kvm_iommu_unmap_memslots(kvm);
	267	return r;
	268	}
	269
fcd95807 JR	270	static void kvm_unpin_pages(struct kvm *kvm, pfn_t pfn, unsigned long npages)
	271	{
	272	unsigned long i;
	273
	274	for (i = 0; i < npages; ++i)
	275	kvm_release_pfn_clean(pfn + i);
	276	}
	277
62c476c7	278	static void kvm_iommu_put_pages(struct kvm *kvm,
260782bc	279	gfn_t base_gfn, unsigned long npages)
62c476c7	280	{
fcd95807 JR	281	struct iommu_domain *domain;
fcd95807 JR	282	gfn_t end_gfn, gfn;
62c476c7	283	pfn_t pfn;
260782bc WH	284	u64 phys;
260782bc WH	285
fcd95807 JR	286	domain = kvm->arch.iommu_domain;
	287	end_gfn = base_gfn + npages;
	288	gfn = base_gfn;
	289
260782bc WH	290	/* check if iommu exists and in use */
	291	if (!domain)
	292	return;
62c476c7	293
fcd95807 JR	294	while (gfn < end_gfn) {
fcd95807 JR	295	unsigned long unmap_pages;
7d3002cc	296	size_t size;
fcd95807 JR	297
fcd95807 JR	298	/* Get physical address */
19de40a8	299	phys = iommu_iova_to_phys(domain, gfn_to_gpa(gfn));
fcd95807 JR	300	pfn = phys >> PAGE_SHIFT;
	301
	302	/* Unmap address from IO address space */
7d3002cc OBC	303	size = iommu_unmap(domain, gfn_to_gpa(gfn), PAGE_SIZE);
7d3002cc OBC	304	unmap_pages = 1ULL << get_order(size);
260782bc	305
fcd95807 JR	306	/* Unpin all pages we just unmapped to not leak any memory */
	307	kvm_unpin_pages(kvm, pfn, unmap_pages);
	308
	309	gfn += unmap_pages;
	310	}
62c476c7 BAY	311	}
	312
	313	static int kvm_iommu_unmap_memslots(struct kvm *kvm)
	314	{
be6ba0f0	315	int idx;
46a26bf5	316	struct kvm_memslots *slots;
be6ba0f0	317	struct kvm_memory_slot *memslot;
46a26bf5	318
95c87e2b	319	idx = srcu_read_lock(&kvm->srcu);
90d83dc3	320	slots = kvm_memslots(kvm);
682edb4c	321
be6ba0f0 XG	322	kvm_for_each_memslot(memslot, slots)
	323	kvm_iommu_put_pages(kvm, memslot->base_gfn, memslot->npages);
	324
95c87e2b	325	srcu_read_unlock(&kvm->srcu, idx);
62c476c7 BAY	326
	327	return 0;
	328	}
	329
	330	int kvm_iommu_unmap_guest(struct kvm *kvm)
	331	{
19de40a8	332	struct iommu_domain *domain = kvm->arch.iommu_domain;
62c476c7 BAY	333
	334	/* check if iommu exists and in use */
	335	if (!domain)
	336	return 0;
	337
62c476c7	338	kvm_iommu_unmap_memslots(kvm);
19de40a8	339	iommu_domain_free(domain);
62c476c7 BAY	340	return 0;
62c476c7 BAY	341	}