1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved
4 *
5 * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
6 * Author: Alex Williamson <alex.williamson@redhat.com>
7 *
8 * Derived from original vfio:
9 * Copyright 2010 Cisco Systems, Inc. All rights reserved.
10 * Author: Tom Lyon, pugs@cisco.com
11 */
12
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15 #include <linux/device.h>
16 #include <linux/eventfd.h>
17 #include <linux/file.h>
18 #include <linux/interrupt.h>
19 #include <linux/iommu.h>
20 #include <linux/module.h>
21 #include <linux/mutex.h>
22 #include <linux/notifier.h>
23 #include <linux/pm_runtime.h>
24 #include <linux/slab.h>
25 #include <linux/types.h>
26 #include <linux/uaccess.h>
27
28 #include "vfio_pci_priv.h"
29
30 #define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>"
31 #define DRIVER_DESC "VFIO PCI - User Level meta-driver"
32
33 static char ids[1024] __initdata;
34 module_param_string(ids, ids, sizeof(ids), 0);
35 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");
36
37 static bool nointxmask;
38 module_param_named(nointxmask, nointxmask, bool, S_IRUGO | S_IWUSR);
39 MODULE_PARM_DESC(nointxmask,
40 "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.");
41
42 #ifdef CONFIG_VFIO_PCI_VGA
43 static bool disable_vga;
44 module_param(disable_vga, bool, S_IRUGO);
45 MODULE_PARM_DESC(disable_vga, "Disable VGA resource access through vfio-pci");
46 #endif
47
48 static bool disable_idle_d3;
49 module_param(disable_idle_d3, bool, S_IRUGO | S_IWUSR);
50 MODULE_PARM_DESC(disable_idle_d3,
51 "Disable using the PCI D3 low power state for idle, unused devices");
52
53 static bool enable_sriov;
54 #ifdef CONFIG_PCI_IOV
55 module_param(enable_sriov, bool, 0644);
56 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.");
57 #endif
58
59 static bool disable_denylist;
60 module_param(disable_denylist, bool, 0444);
61 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.");
62
vfio_pci_dev_in_denylist(struct pci_dev * pdev)63 static bool vfio_pci_dev_in_denylist(struct pci_dev *pdev)
64 {
65 switch (pdev->vendor) {
66 case PCI_VENDOR_ID_INTEL:
67 switch (pdev->device) {
68 case PCI_DEVICE_ID_INTEL_QAT_C3XXX:
69 case PCI_DEVICE_ID_INTEL_QAT_C3XXX_VF:
70 case PCI_DEVICE_ID_INTEL_QAT_C62X:
71 case PCI_DEVICE_ID_INTEL_QAT_C62X_VF:
72 case PCI_DEVICE_ID_INTEL_QAT_DH895XCC:
73 case PCI_DEVICE_ID_INTEL_QAT_DH895XCC_VF:
74 case PCI_DEVICE_ID_INTEL_DSA_SPR0:
75 case PCI_DEVICE_ID_INTEL_IAX_SPR0:
76 return true;
77 default:
78 return false;
79 }
80 }
81
82 return false;
83 }
84
vfio_pci_is_denylisted(struct pci_dev * pdev)85 static bool vfio_pci_is_denylisted(struct pci_dev *pdev)
86 {
87 if (!vfio_pci_dev_in_denylist(pdev))
88 return false;
89
90 if (disable_denylist) {
91 pci_warn(pdev,
92 "device denylist disabled - allowing device %04x:%04x.\n",
93 pdev->vendor, pdev->device);
94 return false;
95 }
96
97 pci_warn(pdev, "%04x:%04x exists in vfio-pci device denylist, driver probing disallowed.\n",
98 pdev->vendor, pdev->device);
99
100 return true;
101 }
102
vfio_pci_open_device(struct vfio_device * core_vdev)103 static int vfio_pci_open_device(struct vfio_device *core_vdev)
104 {
105 struct vfio_pci_core_device *vdev =
106 container_of(core_vdev, struct vfio_pci_core_device, vdev);
107 struct pci_dev *pdev = vdev->pdev;
108 int ret;
109
110 ret = vfio_pci_core_enable(vdev);
111 if (ret)
112 return ret;
113
114 if (vfio_pci_is_vga(pdev) &&
115 pdev->vendor == PCI_VENDOR_ID_INTEL &&
116 IS_ENABLED(CONFIG_VFIO_PCI_IGD)) {
117 ret = vfio_pci_igd_init(vdev);
118 if (ret && ret != -ENODEV) {
119 pci_warn(pdev, "Failed to setup Intel IGD regions\n");
120 vfio_pci_core_disable(vdev);
121 return ret;
122 }
123 }
124
125 vfio_pci_core_finish_enable(vdev);
126
127 return 0;
128 }
129
130 static const struct vfio_device_ops vfio_pci_ops = {
131 .name = "vfio-pci",
132 .init = vfio_pci_core_init_dev,
133 .release = vfio_pci_core_release_dev,
134 .open_device = vfio_pci_open_device,
135 .close_device = vfio_pci_core_close_device,
136 .ioctl = vfio_pci_core_ioctl,
137 .device_feature = vfio_pci_core_ioctl_feature,
138 .read = vfio_pci_core_read,
139 .write = vfio_pci_core_write,
140 .mmap = vfio_pci_core_mmap,
141 .request = vfio_pci_core_request,
142 .match = vfio_pci_core_match,
143 .bind_iommufd = vfio_iommufd_physical_bind,
144 .unbind_iommufd = vfio_iommufd_physical_unbind,
145 .attach_ioas = vfio_iommufd_physical_attach_ioas,
146 .detach_ioas = vfio_iommufd_physical_detach_ioas,
147 };
148
vfio_pci_probe(struct pci_dev * pdev,const struct pci_device_id * id)149 static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
150 {
151 struct vfio_pci_core_device *vdev;
152 int ret;
153
154 if (vfio_pci_is_denylisted(pdev))
155 return -EINVAL;
156
157 vdev = vfio_alloc_device(vfio_pci_core_device, vdev, &pdev->dev,
158 &vfio_pci_ops);
159 if (IS_ERR(vdev))
160 return PTR_ERR(vdev);
161
162 dev_set_drvdata(&pdev->dev, vdev);
163 ret = vfio_pci_core_register_device(vdev);
164 if (ret)
165 goto out_put_vdev;
166 return 0;
167
168 out_put_vdev:
169 vfio_put_device(&vdev->vdev);
170 return ret;
171 }
172
vfio_pci_remove(struct pci_dev * pdev)173 static void vfio_pci_remove(struct pci_dev *pdev)
174 {
175 struct vfio_pci_core_device *vdev = dev_get_drvdata(&pdev->dev);
176
177 vfio_pci_core_unregister_device(vdev);
178 vfio_put_device(&vdev->vdev);
179 }
180
vfio_pci_sriov_configure(struct pci_dev * pdev,int nr_virtfn)181 static int vfio_pci_sriov_configure(struct pci_dev *pdev, int nr_virtfn)
182 {
183 struct vfio_pci_core_device *vdev = dev_get_drvdata(&pdev->dev);
184
185 if (!enable_sriov)
186 return -ENOENT;
187
188 return vfio_pci_core_sriov_configure(vdev, nr_virtfn);
189 }
190
191 static const struct pci_device_id vfio_pci_table[] = {
192 { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_ANY_ID, PCI_ANY_ID) }, /* match all by default */
193 {}
194 };
195
196 MODULE_DEVICE_TABLE(pci, vfio_pci_table);
197
198 static struct pci_driver vfio_pci_driver = {
199 .name = "vfio-pci",
200 .id_table = vfio_pci_table,
201 .probe = vfio_pci_probe,
202 .remove = vfio_pci_remove,
203 .sriov_configure = vfio_pci_sriov_configure,
204 .err_handler = &vfio_pci_core_err_handlers,
205 .driver_managed_dma = true,
206 };
207
vfio_pci_fill_ids(void)208 static void __init vfio_pci_fill_ids(void)
209 {
210 char *p, *id;
211 int rc;
212
213 /* no ids passed actually */
214 if (ids[0] == '\0')
215 return;
216
217 /* add ids specified in the module parameter */
218 p = ids;
219 while ((id = strsep(&p, ","))) {
220 unsigned int vendor, device, subvendor = PCI_ANY_ID,
221 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
222 int fields;
223
224 if (!strlen(id))
225 continue;
226
227 fields = sscanf(id, "%x:%x:%x:%x:%x:%x",
228 &vendor, &device, &subvendor, &subdevice,
229 &class, &class_mask);
230
231 if (fields < 2) {
232 pr_warn("invalid id string \"%s\"\n", id);
233 continue;
234 }
235
236 rc = pci_add_dynid(&vfio_pci_driver, vendor, device,
237 subvendor, subdevice, class, class_mask, 0);
238 if (rc)
239 pr_warn("failed to add dynamic id [%04x:%04x[%04x:%04x]] class %#08x/%08x (%d)\n",
240 vendor, device, subvendor, subdevice,
241 class, class_mask, rc);
242 else
243 pr_info("add [%04x:%04x[%04x:%04x]] class %#08x/%08x\n",
244 vendor, device, subvendor, subdevice,
245 class, class_mask);
246 }
247 }
248
vfio_pci_init(void)249 static int __init vfio_pci_init(void)
250 {
251 int ret;
252 bool is_disable_vga = true;
253
254 #ifdef CONFIG_VFIO_PCI_VGA
255 is_disable_vga = disable_vga;
256 #endif
257
258 vfio_pci_core_set_params(nointxmask, is_disable_vga, disable_idle_d3);
259
260 /* Register and scan for devices */
261 ret = pci_register_driver(&vfio_pci_driver);
262 if (ret)
263 return ret;
264
265 vfio_pci_fill_ids();
266
267 if (disable_denylist)
268 pr_warn("device denylist disabled.\n");
269
270 return 0;
271 }
272 module_init(vfio_pci_init);
273
vfio_pci_cleanup(void)274 static void __exit vfio_pci_cleanup(void)
275 {
276 pci_unregister_driver(&vfio_pci_driver);
277 }
278 module_exit(vfio_pci_cleanup);
279
280 MODULE_LICENSE("GPL v2");
281 MODULE_AUTHOR(DRIVER_AUTHOR);
282 MODULE_DESCRIPTION(DRIVER_DESC);
283