[linux-block.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 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;

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

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

		ret = -ENOENT;

		mutex_lock(&kv->lock);

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

			list_del(&kvg->node);
			kvm_vfio_group_put_external_user(kvg->vfio_group);
			kfree(kvg);
			ret = 0;
			break;
		}

		kvm_arch_end_assignment(dev->kvm);

		mutex_unlock(&kv->lock);

#ifdef CONFIG_SPAPR_TCE_IOMMU
		kvm_spapr_tce_release_vfio_group(dev->kvm, vfio_group);
#endif
		kvm_vfio_group_set_kvm(vfio_group, NULL);

		kvm_vfio_group_put_external_user(vfio_group);

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