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 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 return true; 75 default: 76 return false; 77 } 78 } 79 80 return false; 81 } 82 83 static bool vfio_pci_is_denylisted(struct pci_dev *pdev) 84 { 85 if (!vfio_pci_dev_in_denylist(pdev)) 86 return false; 87 88 if (disable_denylist) { 89 pci_warn(pdev, 90 "device denylist disabled - allowing device %04x:%04x.\n", 91 pdev->vendor, pdev->device); 92 return false; 93 } 94 95 pci_warn(pdev, "%04x:%04x exists in vfio-pci device denylist, driver probing disallowed.\n", 96 pdev->vendor, pdev->device); 97 98 return true; 99 } 100 101 static int vfio_pci_open_device(struct vfio_device *core_vdev) 102 { 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; 106 int ret; 107 108 ret = vfio_pci_core_enable(vdev); 109 if (ret) 110 return ret; 111 112 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); 119 return ret; 120 } 121 } 122 123 vfio_pci_core_finish_enable(vdev); 124 125 return 0; 126 } 127 128 static const struct vfio_device_ops vfio_pci_ops = { 129 .name = "vfio-pci", 130 .init = vfio_pci_core_init_dev, 131 .release = vfio_pci_core_release_dev, 132 .open_device = vfio_pci_open_device, 133 .close_device = vfio_pci_core_close_device, 134 .ioctl = vfio_pci_core_ioctl, 135 .device_feature = vfio_pci_core_ioctl_feature, 136 .read = vfio_pci_core_read, 137 .write = vfio_pci_core_write, 138 .mmap = vfio_pci_core_mmap, 139 .request = vfio_pci_core_request, 140 .match = vfio_pci_core_match, 141 .bind_iommufd = vfio_iommufd_physical_bind, 142 .unbind_iommufd = vfio_iommufd_physical_unbind, 143 .attach_ioas = vfio_iommufd_physical_attach_ioas, 144 }; 145 146 static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) 147 { 148 struct vfio_pci_core_device *vdev; 149 int ret; 150 151 if (vfio_pci_is_denylisted(pdev)) 152 return -EINVAL; 153 154 vdev = vfio_alloc_device(vfio_pci_core_device, vdev, &pdev->dev, 155 &vfio_pci_ops); 156 if (IS_ERR(vdev)) 157 return PTR_ERR(vdev); 158 159 dev_set_drvdata(&pdev->dev, vdev); 160 ret = vfio_pci_core_register_device(vdev); 161 if (ret) 162 goto out_put_vdev; 163 return 0; 164 165 out_put_vdev: 166 vfio_put_device(&vdev->vdev); 167 return ret; 168 } 169 170 static void vfio_pci_remove(struct pci_dev *pdev) 171 { 172 struct vfio_pci_core_device *vdev = dev_get_drvdata(&pdev->dev); 173 174 vfio_pci_core_unregister_device(vdev); 175 vfio_put_device(&vdev->vdev); 176 } 177 178 static int vfio_pci_sriov_configure(struct pci_dev *pdev, int nr_virtfn) 179 { 180 struct vfio_pci_core_device *vdev = dev_get_drvdata(&pdev->dev); 181 182 if (!enable_sriov) 183 return -ENOENT; 184 185 return vfio_pci_core_sriov_configure(vdev, nr_virtfn); 186 } 187 188 static const struct pci_device_id vfio_pci_table[] = { 189 { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_ANY_ID, PCI_ANY_ID) }, /* match all by default */ 190 {} 191 }; 192 193 MODULE_DEVICE_TABLE(pci, vfio_pci_table); 194 195 static struct pci_driver vfio_pci_driver = { 196 .name = "vfio-pci", 197 .id_table = vfio_pci_table, 198 .probe = vfio_pci_probe, 199 .remove = vfio_pci_remove, 200 .sriov_configure = vfio_pci_sriov_configure, 201 .err_handler = &vfio_pci_core_err_handlers, 202 .driver_managed_dma = true, 203 }; 204 205 static void __init vfio_pci_fill_ids(void) 206 { 207 char *p, *id; 208 int rc; 209 210 /* no ids passed actually */ 211 if (ids[0] == '\0') 212 return; 213 214 /* add ids specified in the module parameter */ 215 p = ids; 216 while ((id = strsep(&p, ","))) { 217 unsigned int vendor, device, subvendor = PCI_ANY_ID, 218 subdevice = PCI_ANY_ID, class = 0, class_mask = 0; 219 int fields; 220 221 if (!strlen(id)) 222 continue; 223 224 fields = sscanf(id, "%x:%x:%x:%x:%x:%x", 225 &vendor, &device, &subvendor, &subdevice, 226 &class, &class_mask); 227 228 if (fields < 2) { 229 pr_warn("invalid id string \"%s\"\n", id); 230 continue; 231 } 232 233 rc = pci_add_dynid(&vfio_pci_driver, vendor, device, 234 subvendor, subdevice, class, class_mask, 0); 235 if (rc) 236 pr_warn("failed to add dynamic id [%04x:%04x[%04x:%04x]] class %#08x/%08x (%d)\n", 237 vendor, device, subvendor, subdevice, 238 class, class_mask, rc); 239 else 240 pr_info("add [%04x:%04x[%04x:%04x]] class %#08x/%08x\n", 241 vendor, device, subvendor, subdevice, 242 class, class_mask); 243 } 244 } 245 246 static int __init vfio_pci_init(void) 247 { 248 int ret; 249 bool is_disable_vga = true; 250 251 #ifdef CONFIG_VFIO_PCI_VGA 252 is_disable_vga = disable_vga; 253 #endif 254 255 vfio_pci_core_set_params(nointxmask, is_disable_vga, disable_idle_d3); 256 257 /* Register and scan for devices */ 258 ret = pci_register_driver(&vfio_pci_driver); 259 if (ret) 260 return ret; 261 262 vfio_pci_fill_ids(); 263 264 if (disable_denylist) 265 pr_warn("device denylist disabled.\n"); 266 267 return 0; 268 } 269 module_init(vfio_pci_init); 270 271 static void __exit vfio_pci_cleanup(void) 272 { 273 pci_unregister_driver(&vfio_pci_driver); 274 } 275 module_exit(vfio_pci_cleanup); 276 277 MODULE_LICENSE("GPL v2"); 278 MODULE_AUTHOR(DRIVER_AUTHOR); 279 MODULE_DESCRIPTION(DRIVER_DESC); 280