[mirror_ubuntu-artful-kernel.git] / virt / kvm / vfio.c

/*
 * VFIO-KVM bridge pseudo device
 *
 * Copyright (C) 2013 Red Hat, Inc.  All rights reserved.
 *     Author: Alex Williamson <alex.williamson@redhat.com>
 *
 * 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.
 */

#include <linux/errno.h>
#include <linux/file.h>
#include <linux/kvm_host.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/vfio.h>
#include "vfio.h"

#ifdef CONFIG_SPAPR_TCE_IOMMU
#include <asm/kvm_ppc.h>
#endif

struct kvm_vfio_group {
	struct list_head node;
	struct vfio_group *vfio_group;
};

struct kvm_vfio {
	struct list_head group_list;
	struct mutex lock;
	bool noncoherent;
};

static struct vfio_group *kvm_vfio_group_get_external_user(struct file *filep)
{
	struct vfio_group *vfio_group;
	struct vfio_group *(*fn)(struct file *);

	fn = symbol_get(vfio_group_get_external_user);
	if (!fn)
		return ERR_PTR(-EINVAL);

	vfio_group = fn(filep);

	symbol_put(vfio_group_get_external_user);

	return vfio_group;
}

static bool kvm_vfio_external_group_match_file(struct vfio_group *group,
					       struct file *filep)
{
	bool ret, (*fn)(struct vfio_group *, struct file *);

	fn = symbol_get(vfio_external_group_match_file);
	if (!fn)
		return false;

	ret = fn(group, filep);

	symbol_put(vfio_external_group_match_file);

	return ret;
}

static void kvm_vfio_group_put_external_user(struct vfio_group *vfio_group)
{
	void (*fn)(struct vfio_group *);

	fn = symbol_get(vfio_group_put_external_user);
	if (!fn)
		return;

	fn(vfio_group);

	symbol_put(vfio_group_put_external_user);
}

static void kvm_vfio_group_set_kvm(struct vfio_group *group, struct kvm *kvm)
{
	void (*fn)(struct vfio_group *, struct kvm *);

	fn = symbol_get(vfio_group_set_kvm);
	if (!fn)
		return;

	fn(group, kvm);

	symbol_put(vfio_group_set_kvm);
}

static bool kvm_vfio_group_is_coherent(struct vfio_group *vfio_group)
{
	long (*fn)(struct vfio_group *, unsigned long);
	long ret;

	fn = symbol_get(vfio_external_check_extension);
	if (!fn)
		return false;

	ret = fn(vfio_group, VFIO_DMA_CC_IOMMU);

	symbol_put(vfio_external_check_extension);

	return ret > 0;
}

#ifdef CONFIG_SPAPR_TCE_IOMMU
static int kvm_vfio_external_user_iommu_id(struct vfio_group *vfio_group)
{
	int (*fn)(struct vfio_group *);
	int ret = -EINVAL;

	fn = symbol_get(vfio_external_user_iommu_id);
	if (!fn)
		return ret;

	ret = fn(vfio_group);

	symbol_put(vfio_external_user_iommu_id);

	return ret;
}

static struct iommu_group *kvm_vfio_group_get_iommu_group(
		struct vfio_group *group)
{
	int group_id = kvm_vfio_external_user_iommu_id(group);

	if (group_id < 0)
		return NULL;

	return iommu_group_get_by_id(group_id);
}

static void kvm_spapr_tce_release_vfio_group(struct kvm *kvm,
		struct vfio_group *vfio_group)
{
	struct iommu_group *grp = kvm_vfio_group_get_iommu_group(vfio_group);

	if (WARN_ON_ONCE(!grp))
		return;

	kvm_spapr_tce_release_iommu_group(kvm, grp);
	iommu_group_put(grp);
}
#endif

/*
 * Groups can use the same or different IOMMU domains.  If the same then
 * adding a new group may change the coherency of groups we've previously
 * been told about.  We don't want to care about any of that so we retest
 * each group and bail as soon as we find one that's noncoherent.  This
 * means we only ever [un]register_noncoherent_dma once for the whole device.
 */
static void kvm_vfio_update_coherency(struct kvm_device *dev)
{
	struct kvm_vfio *kv = dev->private;
	bool noncoherent = false;
	struct kvm_vfio_group *kvg;

	mutex_lock(&kv->lock);

	list_for_each_entry(kvg, &kv->group_list, node) {
		if (!kvm_vfio_group_is_coherent(kvg->vfio_group)) {
			noncoherent = true;
			break;
		}
	}

	if (noncoherent != kv->noncoherent) {
		kv->noncoherent = noncoherent;

		if (kv->noncoherent)
			kvm_arch_register_noncoherent_dma(dev->kvm);
		else
			kvm_arch_unregister_noncoherent_dma(dev->kvm);
	}

	mutex_unlock(&kv->lock);
}

static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg)
{
	struct kvm_vfio *kv = dev->private;
	struct vfio_group *vfio_group;
	struct kvm_vfio_group *kvg;
	int32_t __user *argp = (int32_t __user *)(unsigned long)arg;
	struct fd f;
	int32_t fd;
	int ret;

	switch (attr) {
	case KVM_DEV_VFIO_GROUP_ADD:
		if (get_user(fd, argp))
			return -EFAULT;

		f = fdget(fd);
		if (!f.file)
			return -EBADF;

		vfio_group = kvm_vfio_group_get_external_user(f.file);
		fdput(f);

		if (IS_ERR(vfio_group))
			return PTR_ERR(vfio_group);

		mutex_lock(&kv->lock);

		list_for_each_entry(kvg, &kv->group_list, node) {
			if (kvg->vfio_group == vfio_group) {
				mutex_unlock(&kv->lock);
				kvm_vfio_group_put_external_user(vfio_group);
				return -EEXIST;
			}
		}

		kvg = kzalloc(sizeof(*kvg), GFP_KERNEL);
		if (!kvg) {
			mutex_unlock(&kv->lock);
			kvm_vfio_group_put_external_user(vfio_group);
			return -ENOMEM;
		}

		list_add_tail(&kvg->node, &kv->group_list);
		kvg->vfio_group = vfio_group;

		kvm_arch_start_assignment(dev->kvm);

		mutex_unlock(&kv->lock);

		kvm_vfio_group_set_kvm(vfio_group, dev->kvm);

		kvm_vfio_update_coherency(dev);

		return 0;

	case KVM_DEV_VFIO_GROUP_DEL:
		if (get_user(fd, argp))
			return -EFAULT;

		f = fdget(fd);
		if (!f.file)
			return -EBADF;

		ret = -ENOENT;

		mutex_lock(&kv->lock);

		list_for_each_entry(kvg, &kv->group_list, node) {
			if (!kvm_vfio_external_group_match_file(kvg->vfio_group,
								f.file))
				continue;

			list_del(&kvg->node);
			kvm_arch_end_assignment(dev->kvm);
#ifdef CONFIG_SPAPR_TCE_IOMMU
			kvm_spapr_tce_release_vfio_group(dev->kvm,
							 kvg->vfio_group);
#endif
			kvm_vfio_group_set_kvm(kvg->vfio_group, NULL);
			kvm_vfio_group_put_external_user(kvg->vfio_group);
			kfree(kvg);
			ret = 0;
			break;
		}

		mutex_unlock(&kv->lock);

		fdput(f);

		kvm_vfio_update_coherency(dev);

		return ret;

#ifdef CONFIG_SPAPR_TCE_IOMMU
	case KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE: {
		struct kvm_vfio_spapr_tce param;
		struct kvm_vfio *kv = dev->private;
		struct vfio_group *vfio_group;
		struct kvm_vfio_group *kvg;
		struct fd f;
		struct iommu_group *grp;

		if (copy_from_user(&param, (void __user *)arg,
				sizeof(struct kvm_vfio_spapr_tce)))
			return -EFAULT;

		f = fdget(param.groupfd);
		if (!f.file)
			return -EBADF;

		vfio_group = kvm_vfio_group_get_external_user(f.file);
		fdput(f);

		if (IS_ERR(vfio_group))
			return PTR_ERR(vfio_group);

		grp = kvm_vfio_group_get_iommu_group(vfio_group);
		if (WARN_ON_ONCE(!grp)) {
			kvm_vfio_group_put_external_user(vfio_group);
			return -EIO;
		}

		ret = -ENOENT;

		mutex_lock(&kv->lock);

		list_for_each_entry(kvg, &kv->group_list, node) {
			if (kvg->vfio_group != vfio_group)
				continue;

			ret = kvm_spapr_tce_attach_iommu_group(dev->kvm,
					param.tablefd, grp);
			break;
		}

		mutex_unlock(&kv->lock);

		iommu_group_put(grp);
		kvm_vfio_group_put_external_user(vfio_group);

		return ret;
	}
#endif /* CONFIG_SPAPR_TCE_IOMMU */
	}

	return -ENXIO;
}

static int kvm_vfio_set_attr(struct kvm_device *dev,
			     struct kvm_device_attr *attr)
{
	switch (attr->group) {
	case KVM_DEV_VFIO_GROUP:
		return kvm_vfio_set_group(dev, attr->attr, attr->addr);
	}

	return -ENXIO;
}

static int kvm_vfio_has_attr(struct kvm_device *dev,
			     struct kvm_device_attr *attr)
{
	switch (attr->group) {
	case KVM_DEV_VFIO_GROUP:
		switch (attr->attr) {
		case KVM_DEV_VFIO_GROUP_ADD:
		case KVM_DEV_VFIO_GROUP_DEL:
#ifdef CONFIG_SPAPR_TCE_IOMMU
		case KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE:
#endif
			return 0;
		}

		break;
	}

	return -ENXIO;
}

static void kvm_vfio_destroy(struct kvm_device *dev)
{
	struct kvm_vfio *kv = dev->private;
	struct kvm_vfio_group *kvg, *tmp;

	list_for_each_entry_safe(kvg, tmp, &kv->group_list, node) {
#ifdef CONFIG_SPAPR_TCE_IOMMU
		kvm_spapr_tce_release_vfio_group(dev->kvm, kvg->vfio_group);
#endif
		kvm_vfio_group_set_kvm(kvg->vfio_group, NULL);
		kvm_vfio_group_put_external_user(kvg->vfio_group);
		list_del(&kvg->node);
		kfree(kvg);
		kvm_arch_end_assignment(dev->kvm);
	}

	kvm_vfio_update_coherency(dev);

	kfree(kv);
	kfree(dev); /* alloc by kvm_ioctl_create_device, free by .destroy */
}

static int kvm_vfio_create(struct kvm_device *dev, u32 type);

static struct kvm_device_ops kvm_vfio_ops = {
	.name = "kvm-vfio",
	.create = kvm_vfio_create,
	.destroy = kvm_vfio_destroy,
	.set_attr = kvm_vfio_set_attr,
	.has_attr = kvm_vfio_has_attr,
};

static int kvm_vfio_create(struct kvm_device *dev, u32 type)
{
	struct kvm_device *tmp;
	struct kvm_vfio *kv;

	/* Only one VFIO "device" per VM */
	list_for_each_entry(tmp, &dev->kvm->devices, vm_node)
		if (tmp->ops == &kvm_vfio_ops)
			return -EBUSY;

	kv = kzalloc(sizeof(*kv), GFP_KERNEL);
	if (!kv)
		return -ENOMEM;

	INIT_LIST_HEAD(&kv->group_list);
	mutex_init(&kv->lock);

	dev->private = kv;

	return 0;
}

int kvm_vfio_ops_init(void)
{
	return kvm_register_device_ops(&kvm_vfio_ops, KVM_DEV_TYPE_VFIO);
}

void kvm_vfio_ops_exit(void)
{
	kvm_unregister_device_ops(KVM_DEV_TYPE_VFIO);
}
Commit	Line	Data
ec53500f AW	1	/*
	2	* VFIO-KVM bridge pseudo device
	3	*
	4	* Copyright (C) 2013 Red Hat, Inc. All rights reserved.
	5	* Author: Alex Williamson <alex.williamson@redhat.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11
	12	#include <linux/errno.h>
	13	#include <linux/file.h>
	14	#include <linux/kvm_host.h>
	15	#include <linux/list.h>
	16	#include <linux/module.h>
	17	#include <linux/mutex.h>
	18	#include <linux/slab.h>
	19	#include <linux/uaccess.h>
	20	#include <linux/vfio.h>
3c3c29fd	21	#include "vfio.h"
ec53500f	22
121f80ba AK	23	#ifdef CONFIG_SPAPR_TCE_IOMMU
	24	#include <asm/kvm_ppc.h>
	25	#endif
	26
ec53500f AW	27	struct kvm_vfio_group {
	28	struct list_head node;
	29	struct vfio_group *vfio_group;
	30	};
	31
	32	struct kvm_vfio {
	33	struct list_head group_list;
	34	struct mutex lock;
e0f0bbc5	35	bool noncoherent;
ec53500f AW	36	};
	37
	38	static struct vfio_group kvm_vfio_group_get_external_user(struct file filep)
	39	{
	40	struct vfio_group *vfio_group;
	41	struct vfio_group (fn)(struct file *);
	42
	43	fn = symbol_get(vfio_group_get_external_user);
	44	if (!fn)
	45	return ERR_PTR(-EINVAL);
	46
	47	vfio_group = fn(filep);
	48
	49	symbol_put(vfio_group_get_external_user);
	50
	51	return vfio_group;
	52	}
	53
5d6dee80 AW	54	static bool kvm_vfio_external_group_match_file(struct vfio_group *group,
	55	struct file *filep)
	56	{
	57	bool ret, (fn)(struct vfio_group , struct file *);
	58
	59	fn = symbol_get(vfio_external_group_match_file);
	60	if (!fn)
	61	return false;
	62
	63	ret = fn(group, filep);
	64
	65	symbol_put(vfio_external_group_match_file);
	66
	67	return ret;
	68	}
	69
ec53500f AW	70	static void kvm_vfio_group_put_external_user(struct vfio_group *vfio_group)
	71	{
	72	void (fn)(struct vfio_group );
	73
	74	fn = symbol_get(vfio_group_put_external_user);
	75	if (!fn)
	76	return;
	77
	78	fn(vfio_group);
	79
	80	symbol_put(vfio_group_put_external_user);
	81	}
	82
2fc1bec1 JS	83	static void kvm_vfio_group_set_kvm(struct vfio_group group, struct kvm kvm)
	84	{
	85	void (fn)(struct vfio_group , struct kvm *);
	86
	87	fn = symbol_get(vfio_group_set_kvm);
	88	if (!fn)
	89	return;
	90
	91	fn(group, kvm);
	92
	93	symbol_put(vfio_group_set_kvm);
	94	}
	95
9d830d47 AW	96	static bool kvm_vfio_group_is_coherent(struct vfio_group *vfio_group)
	97	{
	98	long (fn)(struct vfio_group , unsigned long);
	99	long ret;
	100
	101	fn = symbol_get(vfio_external_check_extension);
	102	if (!fn)
	103	return false;
	104
	105	ret = fn(vfio_group, VFIO_DMA_CC_IOMMU);
	106
	107	symbol_put(vfio_external_check_extension);
	108
	109	return ret > 0;
	110	}
	111
121f80ba AK	112	#ifdef CONFIG_SPAPR_TCE_IOMMU
	113	static int kvm_vfio_external_user_iommu_id(struct vfio_group *vfio_group)
	114	{
	115	int (fn)(struct vfio_group );
	116	int ret = -EINVAL;
	117
	118	fn = symbol_get(vfio_external_user_iommu_id);
	119	if (!fn)
	120	return ret;
	121
	122	ret = fn(vfio_group);
	123
	124	symbol_put(vfio_external_user_iommu_id);
	125
	126	return ret;
	127	}
	128
	129	static struct iommu_group *kvm_vfio_group_get_iommu_group(
	130	struct vfio_group *group)
	131	{
	132	int group_id = kvm_vfio_external_user_iommu_id(group);
	133
	134	if (group_id < 0)
	135	return NULL;
	136
	137	return iommu_group_get_by_id(group_id);
	138	}
	139
	140	static void kvm_spapr_tce_release_vfio_group(struct kvm *kvm,
	141	struct vfio_group *vfio_group)
	142	{
	143	struct iommu_group *grp = kvm_vfio_group_get_iommu_group(vfio_group);
	144
	145	if (WARN_ON_ONCE(!grp))
	146	return;
	147
	148	kvm_spapr_tce_release_iommu_group(kvm, grp);
	149	iommu_group_put(grp);
	150	}
	151	#endif
	152
e0f0bbc5 AW	153	/*
	154	* Groups can use the same or different IOMMU domains. If the same then
	155	* adding a new group may change the coherency of groups we've previously
	156	* been told about. We don't want to care about any of that so we retest
	157	* each group and bail as soon as we find one that's noncoherent. This
	158	* means we only ever [un]register_noncoherent_dma once for the whole device.
	159	*/
	160	static void kvm_vfio_update_coherency(struct kvm_device *dev)
	161	{
	162	struct kvm_vfio *kv = dev->private;
	163	bool noncoherent = false;
	164	struct kvm_vfio_group *kvg;
	165
	166	mutex_lock(&kv->lock);
	167
	168	list_for_each_entry(kvg, &kv->group_list, node) {
9d830d47 AW	169	if (!kvm_vfio_group_is_coherent(kvg->vfio_group)) {
	170	noncoherent = true;
	171	break;
	172	}
e0f0bbc5 AW	173	}
	174
	175	if (noncoherent != kv->noncoherent) {
	176	kv->noncoherent = noncoherent;
	177
	178	if (kv->noncoherent)
	179	kvm_arch_register_noncoherent_dma(dev->kvm);
	180	else
	181	kvm_arch_unregister_noncoherent_dma(dev->kvm);
	182	}
	183
	184	mutex_unlock(&kv->lock);
	185	}
	186
ec53500f AW	187	static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg)
	188	{
	189	struct kvm_vfio *kv = dev->private;
	190	struct vfio_group *vfio_group;
	191	struct kvm_vfio_group *kvg;
e81d1ad3	192	int32_t __user argp = (int32_t __user )(unsigned long)arg;
ec53500f AW	193	struct fd f;
	194	int32_t fd;
	195	int ret;
	196
	197	switch (attr) {
	198	case KVM_DEV_VFIO_GROUP_ADD:
e81d1ad3	199	if (get_user(fd, argp))
ec53500f AW	200	return -EFAULT;
	201
	202	f = fdget(fd);
	203	if (!f.file)
	204	return -EBADF;
	205
	206	vfio_group = kvm_vfio_group_get_external_user(f.file);
	207	fdput(f);
	208
	209	if (IS_ERR(vfio_group))
	210	return PTR_ERR(vfio_group);
	211
	212	mutex_lock(&kv->lock);
	213
	214	list_for_each_entry(kvg, &kv->group_list, node) {
	215	if (kvg->vfio_group == vfio_group) {
	216	mutex_unlock(&kv->lock);
	217	kvm_vfio_group_put_external_user(vfio_group);
	218	return -EEXIST;
	219	}
	220	}
	221
	222	kvg = kzalloc(sizeof(*kvg), GFP_KERNEL);
	223	if (!kvg) {
	224	mutex_unlock(&kv->lock);
	225	kvm_vfio_group_put_external_user(vfio_group);
	226	return -ENOMEM;
	227	}
	228
	229	list_add_tail(&kvg->node, &kv->group_list);
	230	kvg->vfio_group = vfio_group;
	231
5544eb9b PB	232	kvm_arch_start_assignment(dev->kvm);
5544eb9b PB	233
ec53500f AW	234	mutex_unlock(&kv->lock);
ec53500f AW	235
2fc1bec1 JS	236	kvm_vfio_group_set_kvm(vfio_group, dev->kvm);
2fc1bec1 JS	237
e0f0bbc5 AW	238	kvm_vfio_update_coherency(dev);
e0f0bbc5 AW	239
ec53500f AW	240	return 0;
	241
	242	case KVM_DEV_VFIO_GROUP_DEL:
e81d1ad3	243	if (get_user(fd, argp))
ec53500f AW	244	return -EFAULT;
	245
	246	f = fdget(fd);
	247	if (!f.file)
	248	return -EBADF;
	249
ec53500f AW	250	ret = -ENOENT;
	251
	252	mutex_lock(&kv->lock);
	253
	254	list_for_each_entry(kvg, &kv->group_list, node) {
5d6dee80 AW	255	if (!kvm_vfio_external_group_match_file(kvg->vfio_group,
5d6dee80 AW	256	f.file))
ec53500f AW	257	continue;
	258
	259	list_del(&kvg->node);
e323369b AW	260	kvm_arch_end_assignment(dev->kvm);
	261	#ifdef CONFIG_SPAPR_TCE_IOMMU
	262	kvm_spapr_tce_release_vfio_group(dev->kvm,
	263	kvg->vfio_group);
	264	#endif
	265	kvm_vfio_group_set_kvm(kvg->vfio_group, NULL);
ec53500f AW	266	kvm_vfio_group_put_external_user(kvg->vfio_group);
	267	kfree(kvg);
	268	ret = 0;
	269	break;
	270	}
	271
	272	mutex_unlock(&kv->lock);
	273
5d6dee80	274	fdput(f);
ec53500f	275
e0f0bbc5 AW	276	kvm_vfio_update_coherency(dev);
e0f0bbc5 AW	277
ec53500f	278	return ret;
121f80ba AK	279
	280	#ifdef CONFIG_SPAPR_TCE_IOMMU
	281	case KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE: {
	282	struct kvm_vfio_spapr_tce param;
	283	struct kvm_vfio *kv = dev->private;
	284	struct vfio_group *vfio_group;
	285	struct kvm_vfio_group *kvg;
	286	struct fd f;
	287	struct iommu_group *grp;
	288
	289	if (copy_from_user(&param, (void __user *)arg,
	290	sizeof(struct kvm_vfio_spapr_tce)))
	291	return -EFAULT;
	292
	293	f = fdget(param.groupfd);
	294	if (!f.file)
	295	return -EBADF;
	296
	297	vfio_group = kvm_vfio_group_get_external_user(f.file);
	298	fdput(f);
	299
	300	if (IS_ERR(vfio_group))
	301	return PTR_ERR(vfio_group);
	302
	303	grp = kvm_vfio_group_get_iommu_group(vfio_group);
	304	if (WARN_ON_ONCE(!grp)) {
	305	kvm_vfio_group_put_external_user(vfio_group);
	306	return -EIO;
	307	}
	308
	309	ret = -ENOENT;
	310
	311	mutex_lock(&kv->lock);
	312
	313	list_for_each_entry(kvg, &kv->group_list, node) {
	314	if (kvg->vfio_group != vfio_group)
	315	continue;
	316
	317	ret = kvm_spapr_tce_attach_iommu_group(dev->kvm,
	318	param.tablefd, grp);
	319	break;
	320	}
	321
	322	mutex_unlock(&kv->lock);
	323
	324	iommu_group_put(grp);
	325	kvm_vfio_group_put_external_user(vfio_group);
	326
	327	return ret;
	328	}
	329	#endif /* CONFIG_SPAPR_TCE_IOMMU */
ec53500f AW	330	}
	331
	332	return -ENXIO;
	333	}
	334
	335	static int kvm_vfio_set_attr(struct kvm_device *dev,
	336	struct kvm_device_attr *attr)
	337	{
	338	switch (attr->group) {
	339	case KVM_DEV_VFIO_GROUP:
	340	return kvm_vfio_set_group(dev, attr->attr, attr->addr);
	341	}
	342
	343	return -ENXIO;
	344	}
	345
	346	static int kvm_vfio_has_attr(struct kvm_device *dev,
	347	struct kvm_device_attr *attr)
	348	{
	349	switch (attr->group) {
	350	case KVM_DEV_VFIO_GROUP:
	351	switch (attr->attr) {
	352	case KVM_DEV_VFIO_GROUP_ADD:
	353	case KVM_DEV_VFIO_GROUP_DEL:
121f80ba AK	354	#ifdef CONFIG_SPAPR_TCE_IOMMU
	355	case KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE:
	356	#endif
ec53500f AW	357	return 0;
	358	}
	359
	360	break;
	361	}
	362
	363	return -ENXIO;
	364	}
	365
	366	static void kvm_vfio_destroy(struct kvm_device *dev)
	367	{
	368	struct kvm_vfio *kv = dev->private;
	369	struct kvm_vfio_group kvg, tmp;
	370
	371	list_for_each_entry_safe(kvg, tmp, &kv->group_list, node) {
121f80ba AK	372	#ifdef CONFIG_SPAPR_TCE_IOMMU
	373	kvm_spapr_tce_release_vfio_group(dev->kvm, kvg->vfio_group);
	374	#endif
2fc1bec1	375	kvm_vfio_group_set_kvm(kvg->vfio_group, NULL);
ec53500f AW	376	kvm_vfio_group_put_external_user(kvg->vfio_group);
	377	list_del(&kvg->node);
	378	kfree(kvg);
5544eb9b	379	kvm_arch_end_assignment(dev->kvm);
ec53500f AW	380	}
ec53500f AW	381
e0f0bbc5 AW	382	kvm_vfio_update_coherency(dev);
e0f0bbc5 AW	383
ec53500f AW	384	kfree(kv);
	385	kfree(dev); /* alloc by kvm_ioctl_create_device, free by .destroy */
	386	}
	387
80ce1639 WD	388	static int kvm_vfio_create(struct kvm_device *dev, u32 type);
	389
	390	static struct kvm_device_ops kvm_vfio_ops = {
	391	.name = "kvm-vfio",
	392	.create = kvm_vfio_create,
	393	.destroy = kvm_vfio_destroy,
	394	.set_attr = kvm_vfio_set_attr,
	395	.has_attr = kvm_vfio_has_attr,
	396	};
	397
ec53500f AW	398	static int kvm_vfio_create(struct kvm_device *dev, u32 type)
	399	{
	400	struct kvm_device *tmp;
	401	struct kvm_vfio *kv;
	402
	403	/* Only one VFIO "device" per VM */
	404	list_for_each_entry(tmp, &dev->kvm->devices, vm_node)
	405	if (tmp->ops == &kvm_vfio_ops)
	406	return -EBUSY;
	407
	408	kv = kzalloc(sizeof(*kv), GFP_KERNEL);
	409	if (!kv)
	410	return -ENOMEM;
	411
	412	INIT_LIST_HEAD(&kv->group_list);
	413	mutex_init(&kv->lock);
	414
	415	dev->private = kv;
	416
	417	return 0;
	418	}
	419
3c3c29fd	420	int kvm_vfio_ops_init(void)
80ce1639 WD	421	{
	422	return kvm_register_device_ops(&kvm_vfio_ops, KVM_DEV_TYPE_VFIO);
	423	}
571ee1b6 WL	424
	425	void kvm_vfio_ops_exit(void)
	426	{
	427	kvm_unregister_device_ops(KVM_DEV_TYPE_VFIO);
	428	}