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 <linux/vfio_pci_core.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 .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, 139 }; 140 141 static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) 142 { 143 struct vfio_pci_core_device *vdev; 144 int ret; 145 146 if (vfio_pci_is_denylisted(pdev)) 147 return -EINVAL; 148 149 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); 150 if (!vdev) 151 return -ENOMEM; 152 vfio_pci_core_init_device(vdev, pdev, &vfio_pci_ops); 153 154 dev_set_drvdata(&pdev->dev, vdev); 155 ret = vfio_pci_core_register_device(vdev); 156 if (ret) 157 goto out_free; 158 return 0; 159 160 out_free: 161 vfio_pci_core_uninit_device(vdev); 162 kfree(vdev); 163 return ret; 164 } 165 166 static void vfio_pci_remove(struct pci_dev *pdev) 167 { 168 struct vfio_pci_core_device *vdev = dev_get_drvdata(&pdev->dev); 169 170 vfio_pci_core_unregister_device(vdev); 171 vfio_pci_core_uninit_device(vdev); 172 kfree(vdev); 173 } 174 175 static int vfio_pci_sriov_configure(struct pci_dev *pdev, int nr_virtfn) 176 { 177 struct vfio_pci_core_device *vdev = dev_get_drvdata(&pdev->dev); 178 179 if (!enable_sriov) 180 return -ENOENT; 181 182 return vfio_pci_core_sriov_configure(vdev, nr_virtfn); 183 } 184 185 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 */ 187 {} 188 }; 189 190 MODULE_DEVICE_TABLE(pci, vfio_pci_table); 191 192 static struct pci_driver vfio_pci_driver = { 193 .name = "vfio-pci", 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, 200 }; 201 202 static void __init vfio_pci_fill_ids(void) 203 { 204 char *p, *id; 205 int rc; 206 207 /* no ids passed actually */ 208 if (ids[0] == '\0') 209 return; 210 211 /* add ids specified in the module parameter */ 212 p = ids; 213 while ((id = strsep(&p, ","))) { 214 unsigned int vendor, device, subvendor = PCI_ANY_ID, 215 subdevice = PCI_ANY_ID, class = 0, class_mask = 0; 216 int fields; 217 218 if (!strlen(id)) 219 continue; 220 221 fields = sscanf(id, "%x:%x:%x:%x:%x:%x", 222 &vendor, &device, &subvendor, &subdevice, 223 &class, &class_mask); 224 225 if (fields < 2) { 226 pr_warn("invalid id string \"%s\"\n", id); 227 continue; 228 } 229 230 rc = pci_add_dynid(&vfio_pci_driver, vendor, device, 231 subvendor, subdevice, class, class_mask, 0); 232 if (rc) 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); 236 else 237 pr_info("add [%04x:%04x[%04x:%04x]] class %#08x/%08x\n", 238 vendor, device, subvendor, subdevice, 239 class, class_mask); 240 } 241 } 242 243 static int __init vfio_pci_init(void) 244 { 245 int ret; 246 bool is_disable_vga = true; 247 248 #ifdef CONFIG_VFIO_PCI_VGA 249 is_disable_vga = disable_vga; 250 #endif 251 252 vfio_pci_core_set_params(nointxmask, is_disable_vga, disable_idle_d3); 253 254 /* Register and scan for devices */ 255 ret = pci_register_driver(&vfio_pci_driver); 256 if (ret) 257 return ret; 258 259 vfio_pci_fill_ids(); 260 261 if (disable_denylist) 262 pr_warn("device denylist disabled.\n"); 263 264 return 0; 265 } 266 module_init(vfio_pci_init); 267 268 static void __exit vfio_pci_cleanup(void) 269 { 270 pci_unregister_driver(&vfio_pci_driver); 271 } 272 module_exit(vfio_pci_cleanup); 273 274 MODULE_LICENSE("GPL v2"); 275 MODULE_AUTHOR(DRIVER_AUTHOR); 276 MODULE_DESCRIPTION(DRIVER_DESC); 277