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.
8 * Derived from original vfio:
9 * Copyright 2010 Cisco Systems, Inc. All rights reserved.
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 <linux/vfio_pci_core.h>
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
[email protected] 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:
83 static bool vfio_pci_is_denylisted(struct pci_dev *pdev)
85 if (!vfio_pci_dev_in_denylist(pdev))
88 if (disable_denylist) {
90 "device denylist disabled - allowing device %04x:%04x.\n",
91 pdev->vendor, pdev->device);
95 pci_warn(pdev, "%04x:%04x exists in vfio-pci device denylist, driver probing disallowed.\n",
96 pdev->vendor, pdev->device);
101 static int vfio_pci_open_device(struct vfio_device *core_vdev)
103 struct vfio_pci_core_device *vdev =
104 container_of(core_vdev, struct vfio_pci_core_device, vdev);
105 struct pci_dev *pdev = vdev->pdev;
108 ret = vfio_pci_core_enable(vdev);
112 if (vfio_pci_is_vga(pdev) &&
113 pdev->vendor == PCI_VENDOR_ID_INTEL &&
114 IS_ENABLED(CONFIG_VFIO_PCI_IGD)) {
115 ret = vfio_pci_igd_init(vdev);
116 if (ret && ret != -ENODEV) {
117 pci_warn(pdev, "Failed to setup Intel IGD regions\n");
118 vfio_pci_core_disable(vdev);
123 vfio_pci_core_finish_enable(vdev);
128 static const struct vfio_device_ops vfio_pci_ops = {
130 .open_device = vfio_pci_open_device,
131 .close_device = vfio_pci_core_close_device,
132 .ioctl = vfio_pci_core_ioctl,
133 .device_feature = vfio_pci_core_ioctl_feature,
134 .read = vfio_pci_core_read,
135 .write = vfio_pci_core_write,
136 .mmap = vfio_pci_core_mmap,
137 .request = vfio_pci_core_request,
138 .match = vfio_pci_core_match,
141 static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
143 struct vfio_pci_core_device *vdev;
146 if (vfio_pci_is_denylisted(pdev))
149 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
152 vfio_pci_core_init_device(vdev, pdev, &vfio_pci_ops);
154 dev_set_drvdata(&pdev->dev, vdev);
155 ret = vfio_pci_core_register_device(vdev);
161 vfio_pci_core_uninit_device(vdev);
166 static void vfio_pci_remove(struct pci_dev *pdev)
168 struct vfio_pci_core_device *vdev = dev_get_drvdata(&pdev->dev);
170 vfio_pci_core_unregister_device(vdev);
171 vfio_pci_core_uninit_device(vdev);
175 static int vfio_pci_sriov_configure(struct pci_dev *pdev, int nr_virtfn)
177 struct vfio_pci_core_device *vdev = dev_get_drvdata(&pdev->dev);
182 return vfio_pci_core_sriov_configure(vdev, nr_virtfn);
185 static const struct pci_device_id vfio_pci_table[] = {
186 { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_ANY_ID, PCI_ANY_ID) }, /* match all by default */
190 MODULE_DEVICE_TABLE(pci, vfio_pci_table);
192 static struct pci_driver vfio_pci_driver = {
194 .id_table = vfio_pci_table,
195 .probe = vfio_pci_probe,
196 .remove = vfio_pci_remove,
197 .sriov_configure = vfio_pci_sriov_configure,
198 .err_handler = &vfio_pci_core_err_handlers,
199 .driver_managed_dma = true,
202 static void __init vfio_pci_fill_ids(void)
207 /* no ids passed actually */
211 /* add ids specified in the module parameter */
213 while ((id = strsep(&p, ","))) {
214 unsigned int vendor, device, subvendor = PCI_ANY_ID,
215 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
221 fields = sscanf(id, "%x:%x:%x:%x:%x:%x",
222 &vendor, &device, &subvendor, &subdevice,
223 &class, &class_mask);
226 pr_warn("invalid id string \"%s\"\n", id);
230 rc = pci_add_dynid(&vfio_pci_driver, vendor, device,
231 subvendor, subdevice, class, class_mask, 0);
233 pr_warn("failed to add dynamic id [%04x:%04x[%04x:%04x]] class %#08x/%08x (%d)\n",
234 vendor, device, subvendor, subdevice,
235 class, class_mask, rc);
237 pr_info("add [%04x:%04x[%04x:%04x]] class %#08x/%08x\n",
238 vendor, device, subvendor, subdevice,
243 static int __init vfio_pci_init(void)
246 bool is_disable_vga = true;
248 #ifdef CONFIG_VFIO_PCI_VGA
249 is_disable_vga = disable_vga;
252 vfio_pci_core_set_params(nointxmask, is_disable_vga, disable_idle_d3);
254 /* Register and scan for devices */
255 ret = pci_register_driver(&vfio_pci_driver);
261 if (disable_denylist)
262 pr_warn("device denylist disabled.\n");
266 module_init(vfio_pci_init);
268 static void __exit vfio_pci_cleanup(void)
270 pci_unregister_driver(&vfio_pci_driver);
272 module_exit(vfio_pci_cleanup);
274 MODULE_LICENSE("GPL v2");
275 MODULE_AUTHOR(DRIVER_AUTHOR);
276 MODULE_DESCRIPTION(DRIVER_DESC);