1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved
5 * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
6 * Author: Alex Williamson <alex.williamson@redhat.com>
8 * Derived from original vfio:
9 * Copyright 2010 Cisco Systems, Inc. All rights reserved.
10 * Author: Tom Lyon, pugs@cisco.com
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
28 #include "vfio_pci_priv.h"
30 #define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>"
31 #define DRIVER_DESC "VFIO PCI - User Level meta-driver"
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");
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.");
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");
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");
53 static bool enable_sriov;
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.");
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.");
63 static bool vfio_pci_dev_in_denylist(struct pci_dev *pdev)
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:
85 static bool vfio_pci_is_denylisted(struct pci_dev *pdev)
87 if (!vfio_pci_dev_in_denylist(pdev))
90 if (disable_denylist) {
92 "device denylist disabled - allowing device %04x:%04x.\n",
93 pdev->vendor, pdev->device);
97 pci_warn(pdev, "%04x:%04x exists in vfio-pci device denylist, driver probing disallowed.\n",
98 pdev->vendor, pdev->device);
103 static int vfio_pci_open_device(struct vfio_device *core_vdev)
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;
110 ret = vfio_pci_core_enable(vdev);
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);
125 vfio_pci_core_finish_enable(vdev);
130 static const struct vfio_device_ops vfio_pci_ops = {
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,
149 static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
151 struct vfio_pci_core_device *vdev;
154 if (vfio_pci_is_denylisted(pdev))
157 vdev = vfio_alloc_device(vfio_pci_core_device, vdev, &pdev->dev,
160 return PTR_ERR(vdev);
162 dev_set_drvdata(&pdev->dev, vdev);
163 ret = vfio_pci_core_register_device(vdev);
169 vfio_put_device(&vdev->vdev);
173 static void vfio_pci_remove(struct pci_dev *pdev)
175 struct vfio_pci_core_device *vdev = dev_get_drvdata(&pdev->dev);
177 vfio_pci_core_unregister_device(vdev);
178 vfio_put_device(&vdev->vdev);
181 static int vfio_pci_sriov_configure(struct pci_dev *pdev, int nr_virtfn)
183 struct vfio_pci_core_device *vdev = dev_get_drvdata(&pdev->dev);
188 return vfio_pci_core_sriov_configure(vdev, nr_virtfn);
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 */
196 MODULE_DEVICE_TABLE(pci, vfio_pci_table);
198 static struct pci_driver vfio_pci_driver = {
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,
208 static void __init vfio_pci_fill_ids(void)
213 /* no ids passed actually */
217 /* add ids specified in the module parameter */
219 while ((id = strsep(&p, ","))) {
220 unsigned int vendor, device, subvendor = PCI_ANY_ID,
221 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
227 fields = sscanf(id, "%x:%x:%x:%x:%x:%x",
228 &vendor, &device, &subvendor, &subdevice,
229 &class, &class_mask);
232 pr_warn("invalid id string \"%s\"\n", id);
236 rc = pci_add_dynid(&vfio_pci_driver, vendor, device,
237 subvendor, subdevice, class, class_mask, 0);
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);
243 pr_info("add [%04x:%04x[%04x:%04x]] class %#08x/%08x\n",
244 vendor, device, subvendor, subdevice,
249 static int __init vfio_pci_init(void)
252 bool is_disable_vga = true;
254 #ifdef CONFIG_VFIO_PCI_VGA
255 is_disable_vga = disable_vga;
258 vfio_pci_core_set_params(nointxmask, is_disable_vga, disable_idle_d3);
260 /* Register and scan for devices */
261 ret = pci_register_driver(&vfio_pci_driver);
267 if (disable_denylist)
268 pr_warn("device denylist disabled.\n");
272 module_init(vfio_pci_init);
274 static void __exit vfio_pci_cleanup(void)
276 pci_unregister_driver(&vfio_pci_driver);
278 module_exit(vfio_pci_cleanup);
280 MODULE_LICENSE("GPL v2");
281 MODULE_AUTHOR(DRIVER_AUTHOR);
282 MODULE_DESCRIPTION(DRIVER_DESC);