summaryrefslogtreecommitdiffstats
path: root/drivers/vfio/pci/vfio_pci.c
blob: 2b047469e02feea48b0bbea808fd119d1eeefcfe (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved
 *
 * Copyright (C) 2012 Red Hat, Inc.  All rights reserved.
 *     Author: Alex Williamson <alex.williamson@redhat.com>
 *
 * Derived from original vfio:
 * Copyright 2010 Cisco Systems, Inc.  All rights reserved.
 * Author: Tom Lyon, pugs@cisco.com
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/device.h>
#include <linux/eventfd.h>
#include <linux/file.h>
#include <linux/interrupt.h>
#include <linux/iommu.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/notifier.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/uaccess.h>

#include <linux/vfio_pci_core.h>

#define DRIVER_AUTHOR   "Alex Williamson <alex.williamson@redhat.com>"
#define DRIVER_DESC     "VFIO PCI - User Level meta-driver"

static char ids[1024] __initdata;
module_param_string(ids, ids, sizeof(ids), 0);
MODULE_PARM_DESC(ids, "Initial PCI IDs to add to the vfio driver, format is \"vendor:device[:subvendor[:subdevice[:class[:class_mask]]]]\" and multiple comma separated entries can be specified");

static bool nointxmask;
module_param_named(nointxmask, nointxmask, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(nointxmask,
		  "Disable support for PCI 2.3 style INTx masking.  If this resolves problems for specific devices, report lspci -vvvxxx to linux-pci@vger.kernel.org so the device can be fixed automatically via the broken_intx_masking flag.");

#ifdef CONFIG_VFIO_PCI_VGA
static bool disable_vga;
module_param(disable_vga, bool, S_IRUGO);
MODULE_PARM_DESC(disable_vga, "Disable VGA resource access through vfio-pci");
#endif

static bool disable_idle_d3;
module_param(disable_idle_d3, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(disable_idle_d3,
		 "Disable using the PCI D3 low power state for idle, unused devices");

static bool enable_sriov;
#ifdef CONFIG_PCI_IOV
module_param(enable_sriov, bool, 0644);
MODULE_PARM_DESC(enable_sriov, "Enable support for SR-IOV configuration.  Enabling SR-IOV on a PF typically requires support of the userspace PF driver, enabling VFs without such support may result in non-functional VFs or PF.");
#endif

static bool disable_denylist;
module_param(disable_denylist, bool, 0444);
MODULE_PARM_DESC(disable_denylist, "Disable use of device denylist. Disabling the denylist allows binding to devices with known errata that may lead to exploitable stability or security issues when accessed by untrusted users.");

static bool vfio_pci_dev_in_denylist(struct pci_dev *pdev)
{
	switch (pdev->vendor) {
	case PCI_VENDOR_ID_INTEL:
		switch (pdev->device) {
		case PCI_DEVICE_ID_INTEL_QAT_C3XXX:
		case PCI_DEVICE_ID_INTEL_QAT_C3XXX_VF:
		case PCI_DEVICE_ID_INTEL_QAT_C62X:
		case PCI_DEVICE_ID_INTEL_QAT_C62X_VF:
		case PCI_DEVICE_ID_INTEL_QAT_DH895XCC:
		case PCI_DEVICE_ID_INTEL_QAT_DH895XCC_VF:
			return true;
		default:
			return false;
		}
	}

	return false;
}

static bool vfio_pci_is_denylisted(struct pci_dev *pdev)
{
	if (!vfio_pci_dev_in_denylist(pdev))
		return false;

	if (disable_denylist) {
		pci_warn(pdev,
			 "device denylist disabled - allowing device %04x:%04x.\n",
			 pdev->vendor, pdev->device);
		return false;
	}

	pci_warn(pdev, "%04x:%04x exists in vfio-pci device denylist, driver probing disallowed.\n",
		 pdev->vendor, pdev->device);

	return true;
}

static int vfio_pci_open_device(struct vfio_device *core_vdev)
{
	struct vfio_pci_core_device *vdev =
		container_of(core_vdev, struct vfio_pci_core_device, vdev);
	struct pci_dev *pdev = vdev->pdev;
	int ret;

	ret = vfio_pci_core_enable(vdev);
	if (ret)
		return ret;

	if (vfio_pci_is_vga(pdev) &&
	    pdev->vendor == PCI_VENDOR_ID_INTEL &&
	    IS_ENABLED(CONFIG_VFIO_PCI_IGD)) {
		ret = vfio_pci_igd_init(vdev);
		if (ret && ret != -ENODEV) {
			pci_warn(pdev, "Failed to setup Intel IGD regions\n");
			vfio_pci_core_disable(vdev);
			return ret;
		}
	}

	vfio_pci_core_finish_enable(vdev);

	return 0;
}

static const struct vfio_device_ops vfio_pci_ops = {
	.name		= "vfio-pci",
	.open_device	= vfio_pci_open_device,
	.close_device	= vfio_pci_core_close_device,
	.ioctl		= vfio_pci_core_ioctl,
	.device_feature = vfio_pci_core_ioctl_feature,
	.read		= vfio_pci_core_read,
	.write		= vfio_pci_core_write,
	.mmap		= vfio_pci_core_mmap,
	.request	= vfio_pci_core_request,
	.match		= vfio_pci_core_match,
};

static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
	struct vfio_pci_core_device *vdev;
	int ret;

	if (vfio_pci_is_denylisted(pdev))
		return -EINVAL;

	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
	if (!vdev)
		return -ENOMEM;
	vfio_pci_core_init_device(vdev, pdev, &vfio_pci_ops);

	ret = vfio_pci_core_register_device(vdev);
	if (ret)
		goto out_free;
	dev_set_drvdata(&pdev->dev, vdev);
	return 0;

out_free:
	vfio_pci_core_uninit_device(vdev);
	kfree(vdev);
	return ret;
}

static void vfio_pci_remove(struct pci_dev *pdev)
{
	struct vfio_pci_core_device *vdev = dev_get_drvdata(&pdev->dev);

	vfio_pci_core_unregister_device(vdev);
	vfio_pci_core_uninit_device(vdev);
	kfree(vdev);
}

static int vfio_pci_sriov_configure(struct pci_dev *pdev, int nr_virtfn)
{
	if (!enable_sriov)
		return -ENOENT;

	return vfio_pci_core_sriov_configure(pdev, nr_virtfn);
}

static const struct pci_device_id vfio_pci_table[] = {
	{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_ANY_ID, PCI_ANY_ID) }, /* match all by default */
	{}
};

MODULE_DEVICE_TABLE(pci, vfio_pci_table);

static struct pci_driver vfio_pci_driver = {
	.name			= "vfio-pci",
	.id_table		= vfio_pci_table,
	.probe			= vfio_pci_probe,
	.remove			= vfio_pci_remove,
	.sriov_configure	= vfio_pci_sriov_configure,
	.err_handler		= &vfio_pci_core_err_handlers,
};

static void __init vfio_pci_fill_ids(void)
{
	char *p, *id;
	int rc;

	/* no ids passed actually */
	if (ids[0] == '\0')
		return;

	/* add ids specified in the module parameter */
	p = ids;
	while ((id = strsep(&p, ","))) {
		unsigned int vendor, device, subvendor = PCI_ANY_ID,
			subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
		int fields;

		if (!strlen(id))
			continue;

		fields = sscanf(id, "%x:%x:%x:%x:%x:%x",
				&vendor, &device, &subvendor, &subdevice,
				&class, &class_mask);

		if (fields < 2) {
			pr_warn("invalid id string \"%s\"\n", id);
			continue;
		}

		rc = pci_add_dynid(&vfio_pci_driver, vendor, device,
				   subvendor, subdevice, class, class_mask, 0);
		if (rc)
			pr_warn("failed to add dynamic id [%04x:%04x[%04x:%04x]] class %#08x/%08x (%d)\n",
				vendor, device, subvendor, subdevice,
				class, class_mask, rc);
		else
			pr_info("add [%04x:%04x[%04x:%04x]] class %#08x/%08x\n",
				vendor, device, subvendor, subdevice,
				class, class_mask);
	}
}

static int __init vfio_pci_init(void)
{
	int ret;
	bool is_disable_vga = true;

#ifdef CONFIG_VFIO_PCI_VGA
	is_disable_vga = disable_vga;
#endif

	vfio_pci_core_set_params(nointxmask, is_disable_vga, disable_idle_d3);

	/* Register and scan for devices */
	ret = pci_register_driver(&vfio_pci_driver);
	if (ret)
		return ret;

	vfio_pci_fill_ids();

	if (disable_denylist)
		pr_warn("device denylist disabled.\n");

	return 0;
}
module_init(vfio_pci_init);

static void __exit vfio_pci_cleanup(void)
{
	pci_unregister_driver(&vfio_pci_driver);
}
module_exit(vfio_pci_cleanup);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);