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 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 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 } 102 103 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 }; 148 149 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 } 172 173 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 } 180 181 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 }; 207 208 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 } 248 249 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); 273 274 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