1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * AMD Platform Security Processor (PSP) interface 4 * 5 * Copyright (C) 2016,2018 Advanced Micro Devices, Inc. 6 * 7 * Author: Brijesh Singh <brijesh.singh@amd.com> 8 */ 9 10 #include <linux/module.h> 11 #include <linux/kernel.h> 12 #include <linux/kthread.h> 13 #include <linux/sched.h> 14 #include <linux/interrupt.h> 15 #include <linux/spinlock.h> 16 #include <linux/spinlock_types.h> 17 #include <linux/types.h> 18 #include <linux/mutex.h> 19 #include <linux/delay.h> 20 #include <linux/hw_random.h> 21 #include <linux/ccp.h> 22 #include <linux/firmware.h> 23 24 #include <asm/smp.h> 25 26 #include "sp-dev.h" 27 #include "psp-dev.h" 28 29 #define DEVICE_NAME "sev" 30 #define SEV_FW_FILE "amd/sev.fw" 31 #define SEV_FW_NAME_SIZE 64 32 33 static DEFINE_MUTEX(sev_cmd_mutex); 34 static struct sev_misc_dev *misc_dev; 35 static struct psp_device *psp_master; 36 37 static int psp_cmd_timeout = 100; 38 module_param(psp_cmd_timeout, int, 0644); 39 MODULE_PARM_DESC(psp_cmd_timeout, " default timeout value, in seconds, for PSP commands"); 40 41 static int psp_probe_timeout = 5; 42 module_param(psp_probe_timeout, int, 0644); 43 MODULE_PARM_DESC(psp_probe_timeout, " default timeout value, in seconds, during PSP device probe"); 44 45 static bool psp_dead; 46 static int psp_timeout; 47 48 static inline bool sev_version_greater_or_equal(u8 maj, u8 min) 49 { 50 if (psp_master->api_major > maj) 51 return true; 52 if (psp_master->api_major == maj && psp_master->api_minor >= min) 53 return true; 54 return false; 55 } 56 57 static struct psp_device *psp_alloc_struct(struct sp_device *sp) 58 { 59 struct device *dev = sp->dev; 60 struct psp_device *psp; 61 62 psp = devm_kzalloc(dev, sizeof(*psp), GFP_KERNEL); 63 if (!psp) 64 return NULL; 65 66 psp->dev = dev; 67 psp->sp = sp; 68 69 snprintf(psp->name, sizeof(psp->name), "psp-%u", sp->ord); 70 71 return psp; 72 } 73 74 static irqreturn_t psp_irq_handler(int irq, void *data) 75 { 76 struct psp_device *psp = data; 77 unsigned int status; 78 int reg; 79 80 /* Read the interrupt status: */ 81 status = ioread32(psp->io_regs + psp->vdata->intsts_reg); 82 83 /* Check if it is command completion: */ 84 if (!(status & PSP_CMD_COMPLETE)) 85 goto done; 86 87 /* Check if it is SEV command completion: */ 88 reg = ioread32(psp->io_regs + psp->vdata->cmdresp_reg); 89 if (reg & PSP_CMDRESP_RESP) { 90 psp->sev_int_rcvd = 1; 91 wake_up(&psp->sev_int_queue); 92 } 93 94 done: 95 /* Clear the interrupt status by writing the same value we read. */ 96 iowrite32(status, psp->io_regs + psp->vdata->intsts_reg); 97 98 return IRQ_HANDLED; 99 } 100 101 static int sev_wait_cmd_ioc(struct psp_device *psp, 102 unsigned int *reg, unsigned int timeout) 103 { 104 int ret; 105 106 ret = wait_event_timeout(psp->sev_int_queue, 107 psp->sev_int_rcvd, timeout * HZ); 108 if (!ret) 109 return -ETIMEDOUT; 110 111 *reg = ioread32(psp->io_regs + psp->vdata->cmdresp_reg); 112 113 return 0; 114 } 115 116 static int sev_cmd_buffer_len(int cmd) 117 { 118 switch (cmd) { 119 case SEV_CMD_INIT: return sizeof(struct sev_data_init); 120 case SEV_CMD_PLATFORM_STATUS: return sizeof(struct sev_user_data_status); 121 case SEV_CMD_PEK_CSR: return sizeof(struct sev_data_pek_csr); 122 case SEV_CMD_PEK_CERT_IMPORT: return sizeof(struct sev_data_pek_cert_import); 123 case SEV_CMD_PDH_CERT_EXPORT: return sizeof(struct sev_data_pdh_cert_export); 124 case SEV_CMD_LAUNCH_START: return sizeof(struct sev_data_launch_start); 125 case SEV_CMD_LAUNCH_UPDATE_DATA: return sizeof(struct sev_data_launch_update_data); 126 case SEV_CMD_LAUNCH_UPDATE_VMSA: return sizeof(struct sev_data_launch_update_vmsa); 127 case SEV_CMD_LAUNCH_FINISH: return sizeof(struct sev_data_launch_finish); 128 case SEV_CMD_LAUNCH_MEASURE: return sizeof(struct sev_data_launch_measure); 129 case SEV_CMD_ACTIVATE: return sizeof(struct sev_data_activate); 130 case SEV_CMD_DEACTIVATE: return sizeof(struct sev_data_deactivate); 131 case SEV_CMD_DECOMMISSION: return sizeof(struct sev_data_decommission); 132 case SEV_CMD_GUEST_STATUS: return sizeof(struct sev_data_guest_status); 133 case SEV_CMD_DBG_DECRYPT: return sizeof(struct sev_data_dbg); 134 case SEV_CMD_DBG_ENCRYPT: return sizeof(struct sev_data_dbg); 135 case SEV_CMD_SEND_START: return sizeof(struct sev_data_send_start); 136 case SEV_CMD_SEND_UPDATE_DATA: return sizeof(struct sev_data_send_update_data); 137 case SEV_CMD_SEND_UPDATE_VMSA: return sizeof(struct sev_data_send_update_vmsa); 138 case SEV_CMD_SEND_FINISH: return sizeof(struct sev_data_send_finish); 139 case SEV_CMD_RECEIVE_START: return sizeof(struct sev_data_receive_start); 140 case SEV_CMD_RECEIVE_FINISH: return sizeof(struct sev_data_receive_finish); 141 case SEV_CMD_RECEIVE_UPDATE_DATA: return sizeof(struct sev_data_receive_update_data); 142 case SEV_CMD_RECEIVE_UPDATE_VMSA: return sizeof(struct sev_data_receive_update_vmsa); 143 case SEV_CMD_LAUNCH_UPDATE_SECRET: return sizeof(struct sev_data_launch_secret); 144 case SEV_CMD_DOWNLOAD_FIRMWARE: return sizeof(struct sev_data_download_firmware); 145 case SEV_CMD_GET_ID: return sizeof(struct sev_data_get_id); 146 default: return 0; 147 } 148 149 return 0; 150 } 151 152 static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret) 153 { 154 struct psp_device *psp = psp_master; 155 unsigned int phys_lsb, phys_msb; 156 unsigned int reg, ret = 0; 157 158 if (!psp) 159 return -ENODEV; 160 161 if (psp_dead) 162 return -EBUSY; 163 164 /* Get the physical address of the command buffer */ 165 phys_lsb = data ? lower_32_bits(__psp_pa(data)) : 0; 166 phys_msb = data ? upper_32_bits(__psp_pa(data)) : 0; 167 168 dev_dbg(psp->dev, "sev command id %#x buffer 0x%08x%08x timeout %us\n", 169 cmd, phys_msb, phys_lsb, psp_timeout); 170 171 print_hex_dump_debug("(in): ", DUMP_PREFIX_OFFSET, 16, 2, data, 172 sev_cmd_buffer_len(cmd), false); 173 174 iowrite32(phys_lsb, psp->io_regs + psp->vdata->cmdbuff_addr_lo_reg); 175 iowrite32(phys_msb, psp->io_regs + psp->vdata->cmdbuff_addr_hi_reg); 176 177 psp->sev_int_rcvd = 0; 178 179 reg = cmd; 180 reg <<= PSP_CMDRESP_CMD_SHIFT; 181 reg |= PSP_CMDRESP_IOC; 182 iowrite32(reg, psp->io_regs + psp->vdata->cmdresp_reg); 183 184 /* wait for command completion */ 185 ret = sev_wait_cmd_ioc(psp, ®, psp_timeout); 186 if (ret) { 187 if (psp_ret) 188 *psp_ret = 0; 189 190 dev_err(psp->dev, "sev command %#x timed out, disabling PSP \n", cmd); 191 psp_dead = true; 192 193 return ret; 194 } 195 196 psp_timeout = psp_cmd_timeout; 197 198 if (psp_ret) 199 *psp_ret = reg & PSP_CMDRESP_ERR_MASK; 200 201 if (reg & PSP_CMDRESP_ERR_MASK) { 202 dev_dbg(psp->dev, "sev command %#x failed (%#010x)\n", 203 cmd, reg & PSP_CMDRESP_ERR_MASK); 204 ret = -EIO; 205 } 206 207 print_hex_dump_debug("(out): ", DUMP_PREFIX_OFFSET, 16, 2, data, 208 sev_cmd_buffer_len(cmd), false); 209 210 return ret; 211 } 212 213 static int sev_do_cmd(int cmd, void *data, int *psp_ret) 214 { 215 int rc; 216 217 mutex_lock(&sev_cmd_mutex); 218 rc = __sev_do_cmd_locked(cmd, data, psp_ret); 219 mutex_unlock(&sev_cmd_mutex); 220 221 return rc; 222 } 223 224 static int __sev_platform_init_locked(int *error) 225 { 226 struct psp_device *psp = psp_master; 227 int rc = 0; 228 229 if (!psp) 230 return -ENODEV; 231 232 if (psp->sev_state == SEV_STATE_INIT) 233 return 0; 234 235 rc = __sev_do_cmd_locked(SEV_CMD_INIT, &psp->init_cmd_buf, error); 236 if (rc) 237 return rc; 238 239 psp->sev_state = SEV_STATE_INIT; 240 241 /* Prepare for first SEV guest launch after INIT */ 242 wbinvd_on_all_cpus(); 243 rc = __sev_do_cmd_locked(SEV_CMD_DF_FLUSH, NULL, error); 244 if (rc) 245 return rc; 246 247 dev_dbg(psp->dev, "SEV firmware initialized\n"); 248 249 return rc; 250 } 251 252 int sev_platform_init(int *error) 253 { 254 int rc; 255 256 mutex_lock(&sev_cmd_mutex); 257 rc = __sev_platform_init_locked(error); 258 mutex_unlock(&sev_cmd_mutex); 259 260 return rc; 261 } 262 EXPORT_SYMBOL_GPL(sev_platform_init); 263 264 static int __sev_platform_shutdown_locked(int *error) 265 { 266 int ret; 267 268 ret = __sev_do_cmd_locked(SEV_CMD_SHUTDOWN, NULL, error); 269 if (ret) 270 return ret; 271 272 psp_master->sev_state = SEV_STATE_UNINIT; 273 dev_dbg(psp_master->dev, "SEV firmware shutdown\n"); 274 275 return ret; 276 } 277 278 static int sev_platform_shutdown(int *error) 279 { 280 int rc; 281 282 mutex_lock(&sev_cmd_mutex); 283 rc = __sev_platform_shutdown_locked(NULL); 284 mutex_unlock(&sev_cmd_mutex); 285 286 return rc; 287 } 288 289 static int sev_get_platform_state(int *state, int *error) 290 { 291 int rc; 292 293 rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, 294 &psp_master->status_cmd_buf, error); 295 if (rc) 296 return rc; 297 298 *state = psp_master->status_cmd_buf.state; 299 return rc; 300 } 301 302 static int sev_ioctl_do_reset(struct sev_issue_cmd *argp) 303 { 304 int state, rc; 305 306 if (!capable(CAP_SYS_ADMIN)) 307 return -EPERM; 308 309 /* 310 * The SEV spec requires that FACTORY_RESET must be issued in 311 * UNINIT state. Before we go further lets check if any guest is 312 * active. 313 * 314 * If FW is in WORKING state then deny the request otherwise issue 315 * SHUTDOWN command do INIT -> UNINIT before issuing the FACTORY_RESET. 316 * 317 */ 318 rc = sev_get_platform_state(&state, &argp->error); 319 if (rc) 320 return rc; 321 322 if (state == SEV_STATE_WORKING) 323 return -EBUSY; 324 325 if (state == SEV_STATE_INIT) { 326 rc = __sev_platform_shutdown_locked(&argp->error); 327 if (rc) 328 return rc; 329 } 330 331 return __sev_do_cmd_locked(SEV_CMD_FACTORY_RESET, NULL, &argp->error); 332 } 333 334 static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp) 335 { 336 struct sev_user_data_status *data = &psp_master->status_cmd_buf; 337 int ret; 338 339 ret = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, data, &argp->error); 340 if (ret) 341 return ret; 342 343 if (copy_to_user((void __user *)argp->data, data, sizeof(*data))) 344 ret = -EFAULT; 345 346 return ret; 347 } 348 349 static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp) 350 { 351 int rc; 352 353 if (!capable(CAP_SYS_ADMIN)) 354 return -EPERM; 355 356 if (psp_master->sev_state == SEV_STATE_UNINIT) { 357 rc = __sev_platform_init_locked(&argp->error); 358 if (rc) 359 return rc; 360 } 361 362 return __sev_do_cmd_locked(cmd, NULL, &argp->error); 363 } 364 365 static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp) 366 { 367 struct sev_user_data_pek_csr input; 368 struct sev_data_pek_csr *data; 369 void *blob = NULL; 370 int ret; 371 372 if (!capable(CAP_SYS_ADMIN)) 373 return -EPERM; 374 375 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input))) 376 return -EFAULT; 377 378 data = kzalloc(sizeof(*data), GFP_KERNEL); 379 if (!data) 380 return -ENOMEM; 381 382 /* userspace wants to query CSR length */ 383 if (!input.address || !input.length) 384 goto cmd; 385 386 /* allocate a physically contiguous buffer to store the CSR blob */ 387 if (!access_ok(input.address, input.length) || 388 input.length > SEV_FW_BLOB_MAX_SIZE) { 389 ret = -EFAULT; 390 goto e_free; 391 } 392 393 blob = kmalloc(input.length, GFP_KERNEL); 394 if (!blob) { 395 ret = -ENOMEM; 396 goto e_free; 397 } 398 399 data->address = __psp_pa(blob); 400 data->len = input.length; 401 402 cmd: 403 if (psp_master->sev_state == SEV_STATE_UNINIT) { 404 ret = __sev_platform_init_locked(&argp->error); 405 if (ret) 406 goto e_free_blob; 407 } 408 409 ret = __sev_do_cmd_locked(SEV_CMD_PEK_CSR, data, &argp->error); 410 411 /* If we query the CSR length, FW responded with expected data. */ 412 input.length = data->len; 413 414 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) { 415 ret = -EFAULT; 416 goto e_free_blob; 417 } 418 419 if (blob) { 420 if (copy_to_user((void __user *)input.address, blob, input.length)) 421 ret = -EFAULT; 422 } 423 424 e_free_blob: 425 kfree(blob); 426 e_free: 427 kfree(data); 428 return ret; 429 } 430 431 void *psp_copy_user_blob(u64 __user uaddr, u32 len) 432 { 433 if (!uaddr || !len) 434 return ERR_PTR(-EINVAL); 435 436 /* verify that blob length does not exceed our limit */ 437 if (len > SEV_FW_BLOB_MAX_SIZE) 438 return ERR_PTR(-EINVAL); 439 440 return memdup_user((void __user *)(uintptr_t)uaddr, len); 441 } 442 EXPORT_SYMBOL_GPL(psp_copy_user_blob); 443 444 static int sev_get_api_version(void) 445 { 446 struct sev_user_data_status *status; 447 int error = 0, ret; 448 449 status = &psp_master->status_cmd_buf; 450 ret = sev_platform_status(status, &error); 451 if (ret) { 452 dev_err(psp_master->dev, 453 "SEV: failed to get status. Error: %#x\n", error); 454 return 1; 455 } 456 457 psp_master->api_major = status->api_major; 458 psp_master->api_minor = status->api_minor; 459 psp_master->build = status->build; 460 psp_master->sev_state = status->state; 461 462 return 0; 463 } 464 465 static int sev_get_firmware(struct device *dev, 466 const struct firmware **firmware) 467 { 468 char fw_name_specific[SEV_FW_NAME_SIZE]; 469 char fw_name_subset[SEV_FW_NAME_SIZE]; 470 471 snprintf(fw_name_specific, sizeof(fw_name_specific), 472 "amd/amd_sev_fam%.2xh_model%.2xh.sbin", 473 boot_cpu_data.x86, boot_cpu_data.x86_model); 474 475 snprintf(fw_name_subset, sizeof(fw_name_subset), 476 "amd/amd_sev_fam%.2xh_model%.1xxh.sbin", 477 boot_cpu_data.x86, (boot_cpu_data.x86_model & 0xf0) >> 4); 478 479 /* Check for SEV FW for a particular model. 480 * Ex. amd_sev_fam17h_model00h.sbin for Family 17h Model 00h 481 * 482 * or 483 * 484 * Check for SEV FW common to a subset of models. 485 * Ex. amd_sev_fam17h_model0xh.sbin for 486 * Family 17h Model 00h -- Family 17h Model 0Fh 487 * 488 * or 489 * 490 * Fall-back to using generic name: sev.fw 491 */ 492 if ((firmware_request_nowarn(firmware, fw_name_specific, dev) >= 0) || 493 (firmware_request_nowarn(firmware, fw_name_subset, dev) >= 0) || 494 (firmware_request_nowarn(firmware, SEV_FW_FILE, dev) >= 0)) 495 return 0; 496 497 return -ENOENT; 498 } 499 500 /* Don't fail if SEV FW couldn't be updated. Continue with existing SEV FW */ 501 static int sev_update_firmware(struct device *dev) 502 { 503 struct sev_data_download_firmware *data; 504 const struct firmware *firmware; 505 int ret, error, order; 506 struct page *p; 507 u64 data_size; 508 509 if (sev_get_firmware(dev, &firmware) == -ENOENT) { 510 dev_dbg(dev, "No SEV firmware file present\n"); 511 return -1; 512 } 513 514 /* 515 * SEV FW expects the physical address given to it to be 32 516 * byte aligned. Memory allocated has structure placed at the 517 * beginning followed by the firmware being passed to the SEV 518 * FW. Allocate enough memory for data structure + alignment 519 * padding + SEV FW. 520 */ 521 data_size = ALIGN(sizeof(struct sev_data_download_firmware), 32); 522 523 order = get_order(firmware->size + data_size); 524 p = alloc_pages(GFP_KERNEL, order); 525 if (!p) { 526 ret = -1; 527 goto fw_err; 528 } 529 530 /* 531 * Copy firmware data to a kernel allocated contiguous 532 * memory region. 533 */ 534 data = page_address(p); 535 memcpy(page_address(p) + data_size, firmware->data, firmware->size); 536 537 data->address = __psp_pa(page_address(p) + data_size); 538 data->len = firmware->size; 539 540 ret = sev_do_cmd(SEV_CMD_DOWNLOAD_FIRMWARE, data, &error); 541 if (ret) 542 dev_dbg(dev, "Failed to update SEV firmware: %#x\n", error); 543 else 544 dev_info(dev, "SEV firmware update successful\n"); 545 546 __free_pages(p, order); 547 548 fw_err: 549 release_firmware(firmware); 550 551 return ret; 552 } 553 554 static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp) 555 { 556 struct sev_user_data_pek_cert_import input; 557 struct sev_data_pek_cert_import *data; 558 void *pek_blob, *oca_blob; 559 int ret; 560 561 if (!capable(CAP_SYS_ADMIN)) 562 return -EPERM; 563 564 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input))) 565 return -EFAULT; 566 567 data = kzalloc(sizeof(*data), GFP_KERNEL); 568 if (!data) 569 return -ENOMEM; 570 571 /* copy PEK certificate blobs from userspace */ 572 pek_blob = psp_copy_user_blob(input.pek_cert_address, input.pek_cert_len); 573 if (IS_ERR(pek_blob)) { 574 ret = PTR_ERR(pek_blob); 575 goto e_free; 576 } 577 578 data->pek_cert_address = __psp_pa(pek_blob); 579 data->pek_cert_len = input.pek_cert_len; 580 581 /* copy PEK certificate blobs from userspace */ 582 oca_blob = psp_copy_user_blob(input.oca_cert_address, input.oca_cert_len); 583 if (IS_ERR(oca_blob)) { 584 ret = PTR_ERR(oca_blob); 585 goto e_free_pek; 586 } 587 588 data->oca_cert_address = __psp_pa(oca_blob); 589 data->oca_cert_len = input.oca_cert_len; 590 591 /* If platform is not in INIT state then transition it to INIT */ 592 if (psp_master->sev_state != SEV_STATE_INIT) { 593 ret = __sev_platform_init_locked(&argp->error); 594 if (ret) 595 goto e_free_oca; 596 } 597 598 ret = __sev_do_cmd_locked(SEV_CMD_PEK_CERT_IMPORT, data, &argp->error); 599 600 e_free_oca: 601 kfree(oca_blob); 602 e_free_pek: 603 kfree(pek_blob); 604 e_free: 605 kfree(data); 606 return ret; 607 } 608 609 static int sev_ioctl_do_get_id2(struct sev_issue_cmd *argp) 610 { 611 struct sev_user_data_get_id2 input; 612 struct sev_data_get_id *data; 613 void *id_blob = NULL; 614 int ret; 615 616 /* SEV GET_ID is available from SEV API v0.16 and up */ 617 if (!sev_version_greater_or_equal(0, 16)) 618 return -ENOTSUPP; 619 620 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input))) 621 return -EFAULT; 622 623 /* Check if we have write access to the userspace buffer */ 624 if (input.address && 625 input.length && 626 !access_ok(input.address, input.length)) 627 return -EFAULT; 628 629 data = kzalloc(sizeof(*data), GFP_KERNEL); 630 if (!data) 631 return -ENOMEM; 632 633 if (input.address && input.length) { 634 id_blob = kmalloc(input.length, GFP_KERNEL); 635 if (!id_blob) { 636 kfree(data); 637 return -ENOMEM; 638 } 639 640 data->address = __psp_pa(id_blob); 641 data->len = input.length; 642 } 643 644 ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error); 645 646 /* 647 * Firmware will return the length of the ID value (either the minimum 648 * required length or the actual length written), return it to the user. 649 */ 650 input.length = data->len; 651 652 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) { 653 ret = -EFAULT; 654 goto e_free; 655 } 656 657 if (id_blob) { 658 if (copy_to_user((void __user *)input.address, 659 id_blob, data->len)) { 660 ret = -EFAULT; 661 goto e_free; 662 } 663 } 664 665 e_free: 666 kfree(id_blob); 667 kfree(data); 668 669 return ret; 670 } 671 672 static int sev_ioctl_do_get_id(struct sev_issue_cmd *argp) 673 { 674 struct sev_data_get_id *data; 675 u64 data_size, user_size; 676 void *id_blob, *mem; 677 int ret; 678 679 /* SEV GET_ID available from SEV API v0.16 and up */ 680 if (!sev_version_greater_or_equal(0, 16)) 681 return -ENOTSUPP; 682 683 /* SEV FW expects the buffer it fills with the ID to be 684 * 8-byte aligned. Memory allocated should be enough to 685 * hold data structure + alignment padding + memory 686 * where SEV FW writes the ID. 687 */ 688 data_size = ALIGN(sizeof(struct sev_data_get_id), 8); 689 user_size = sizeof(struct sev_user_data_get_id); 690 691 mem = kzalloc(data_size + user_size, GFP_KERNEL); 692 if (!mem) 693 return -ENOMEM; 694 695 data = mem; 696 id_blob = mem + data_size; 697 698 data->address = __psp_pa(id_blob); 699 data->len = user_size; 700 701 ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error); 702 if (!ret) { 703 if (copy_to_user((void __user *)argp->data, id_blob, data->len)) 704 ret = -EFAULT; 705 } 706 707 kfree(mem); 708 709 return ret; 710 } 711 712 static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp) 713 { 714 struct sev_user_data_pdh_cert_export input; 715 void *pdh_blob = NULL, *cert_blob = NULL; 716 struct sev_data_pdh_cert_export *data; 717 int ret; 718 719 /* If platform is not in INIT state then transition it to INIT. */ 720 if (psp_master->sev_state != SEV_STATE_INIT) { 721 if (!capable(CAP_SYS_ADMIN)) 722 return -EPERM; 723 724 ret = __sev_platform_init_locked(&argp->error); 725 if (ret) 726 return ret; 727 } 728 729 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input))) 730 return -EFAULT; 731 732 data = kzalloc(sizeof(*data), GFP_KERNEL); 733 if (!data) 734 return -ENOMEM; 735 736 /* Userspace wants to query the certificate length. */ 737 if (!input.pdh_cert_address || 738 !input.pdh_cert_len || 739 !input.cert_chain_address) 740 goto cmd; 741 742 /* Allocate a physically contiguous buffer to store the PDH blob. */ 743 if ((input.pdh_cert_len > SEV_FW_BLOB_MAX_SIZE) || 744 !access_ok(input.pdh_cert_address, input.pdh_cert_len)) { 745 ret = -EFAULT; 746 goto e_free; 747 } 748 749 /* Allocate a physically contiguous buffer to store the cert chain blob. */ 750 if ((input.cert_chain_len > SEV_FW_BLOB_MAX_SIZE) || 751 !access_ok(input.cert_chain_address, input.cert_chain_len)) { 752 ret = -EFAULT; 753 goto e_free; 754 } 755 756 pdh_blob = kmalloc(input.pdh_cert_len, GFP_KERNEL); 757 if (!pdh_blob) { 758 ret = -ENOMEM; 759 goto e_free; 760 } 761 762 data->pdh_cert_address = __psp_pa(pdh_blob); 763 data->pdh_cert_len = input.pdh_cert_len; 764 765 cert_blob = kmalloc(input.cert_chain_len, GFP_KERNEL); 766 if (!cert_blob) { 767 ret = -ENOMEM; 768 goto e_free_pdh; 769 } 770 771 data->cert_chain_address = __psp_pa(cert_blob); 772 data->cert_chain_len = input.cert_chain_len; 773 774 cmd: 775 ret = __sev_do_cmd_locked(SEV_CMD_PDH_CERT_EXPORT, data, &argp->error); 776 777 /* If we query the length, FW responded with expected data. */ 778 input.cert_chain_len = data->cert_chain_len; 779 input.pdh_cert_len = data->pdh_cert_len; 780 781 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) { 782 ret = -EFAULT; 783 goto e_free_cert; 784 } 785 786 if (pdh_blob) { 787 if (copy_to_user((void __user *)input.pdh_cert_address, 788 pdh_blob, input.pdh_cert_len)) { 789 ret = -EFAULT; 790 goto e_free_cert; 791 } 792 } 793 794 if (cert_blob) { 795 if (copy_to_user((void __user *)input.cert_chain_address, 796 cert_blob, input.cert_chain_len)) 797 ret = -EFAULT; 798 } 799 800 e_free_cert: 801 kfree(cert_blob); 802 e_free_pdh: 803 kfree(pdh_blob); 804 e_free: 805 kfree(data); 806 return ret; 807 } 808 809 static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg) 810 { 811 void __user *argp = (void __user *)arg; 812 struct sev_issue_cmd input; 813 int ret = -EFAULT; 814 815 if (!psp_master) 816 return -ENODEV; 817 818 if (ioctl != SEV_ISSUE_CMD) 819 return -EINVAL; 820 821 if (copy_from_user(&input, argp, sizeof(struct sev_issue_cmd))) 822 return -EFAULT; 823 824 if (input.cmd > SEV_MAX) 825 return -EINVAL; 826 827 mutex_lock(&sev_cmd_mutex); 828 829 switch (input.cmd) { 830 831 case SEV_FACTORY_RESET: 832 ret = sev_ioctl_do_reset(&input); 833 break; 834 case SEV_PLATFORM_STATUS: 835 ret = sev_ioctl_do_platform_status(&input); 836 break; 837 case SEV_PEK_GEN: 838 ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PEK_GEN, &input); 839 break; 840 case SEV_PDH_GEN: 841 ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PDH_GEN, &input); 842 break; 843 case SEV_PEK_CSR: 844 ret = sev_ioctl_do_pek_csr(&input); 845 break; 846 case SEV_PEK_CERT_IMPORT: 847 ret = sev_ioctl_do_pek_import(&input); 848 break; 849 case SEV_PDH_CERT_EXPORT: 850 ret = sev_ioctl_do_pdh_export(&input); 851 break; 852 case SEV_GET_ID: 853 pr_warn_once("SEV_GET_ID command is deprecated, use SEV_GET_ID2\n"); 854 ret = sev_ioctl_do_get_id(&input); 855 break; 856 case SEV_GET_ID2: 857 ret = sev_ioctl_do_get_id2(&input); 858 break; 859 default: 860 ret = -EINVAL; 861 goto out; 862 } 863 864 if (copy_to_user(argp, &input, sizeof(struct sev_issue_cmd))) 865 ret = -EFAULT; 866 out: 867 mutex_unlock(&sev_cmd_mutex); 868 869 return ret; 870 } 871 872 static const struct file_operations sev_fops = { 873 .owner = THIS_MODULE, 874 .unlocked_ioctl = sev_ioctl, 875 }; 876 877 int sev_platform_status(struct sev_user_data_status *data, int *error) 878 { 879 return sev_do_cmd(SEV_CMD_PLATFORM_STATUS, data, error); 880 } 881 EXPORT_SYMBOL_GPL(sev_platform_status); 882 883 int sev_guest_deactivate(struct sev_data_deactivate *data, int *error) 884 { 885 return sev_do_cmd(SEV_CMD_DEACTIVATE, data, error); 886 } 887 EXPORT_SYMBOL_GPL(sev_guest_deactivate); 888 889 int sev_guest_activate(struct sev_data_activate *data, int *error) 890 { 891 return sev_do_cmd(SEV_CMD_ACTIVATE, data, error); 892 } 893 EXPORT_SYMBOL_GPL(sev_guest_activate); 894 895 int sev_guest_decommission(struct sev_data_decommission *data, int *error) 896 { 897 return sev_do_cmd(SEV_CMD_DECOMMISSION, data, error); 898 } 899 EXPORT_SYMBOL_GPL(sev_guest_decommission); 900 901 int sev_guest_df_flush(int *error) 902 { 903 return sev_do_cmd(SEV_CMD_DF_FLUSH, NULL, error); 904 } 905 EXPORT_SYMBOL_GPL(sev_guest_df_flush); 906 907 static void sev_exit(struct kref *ref) 908 { 909 struct sev_misc_dev *misc_dev = container_of(ref, struct sev_misc_dev, refcount); 910 911 misc_deregister(&misc_dev->misc); 912 } 913 914 static int sev_misc_init(struct psp_device *psp) 915 { 916 struct device *dev = psp->dev; 917 int ret; 918 919 /* 920 * SEV feature support can be detected on multiple devices but the SEV 921 * FW commands must be issued on the master. During probe, we do not 922 * know the master hence we create /dev/sev on the first device probe. 923 * sev_do_cmd() finds the right master device to which to issue the 924 * command to the firmware. 925 */ 926 if (!misc_dev) { 927 struct miscdevice *misc; 928 929 misc_dev = devm_kzalloc(dev, sizeof(*misc_dev), GFP_KERNEL); 930 if (!misc_dev) 931 return -ENOMEM; 932 933 misc = &misc_dev->misc; 934 misc->minor = MISC_DYNAMIC_MINOR; 935 misc->name = DEVICE_NAME; 936 misc->fops = &sev_fops; 937 938 ret = misc_register(misc); 939 if (ret) 940 return ret; 941 942 kref_init(&misc_dev->refcount); 943 } else { 944 kref_get(&misc_dev->refcount); 945 } 946 947 init_waitqueue_head(&psp->sev_int_queue); 948 psp->sev_misc = misc_dev; 949 dev_dbg(dev, "registered SEV device\n"); 950 951 return 0; 952 } 953 954 static int psp_check_sev_support(struct psp_device *psp) 955 { 956 unsigned int val = ioread32(psp->io_regs + psp->vdata->feature_reg); 957 958 /* 959 * Check for a access to the registers. If this read returns 960 * 0xffffffff, it's likely that the system is running a broken 961 * BIOS which disallows access to the device. Stop here and 962 * fail the PSP initialization (but not the load, as the CCP 963 * could get properly initialized). 964 */ 965 if (val == 0xffffffff) { 966 dev_notice(psp->dev, "psp: unable to access the device: you might be running a broken BIOS.\n"); 967 return -ENODEV; 968 } 969 970 if (!(val & 1)) { 971 /* Device does not support the SEV feature */ 972 dev_dbg(psp->dev, "psp does not support SEV\n"); 973 return -ENODEV; 974 } 975 976 return 0; 977 } 978 979 int psp_dev_init(struct sp_device *sp) 980 { 981 struct device *dev = sp->dev; 982 struct psp_device *psp; 983 int ret; 984 985 ret = -ENOMEM; 986 psp = psp_alloc_struct(sp); 987 if (!psp) 988 goto e_err; 989 990 sp->psp_data = psp; 991 992 psp->vdata = (struct psp_vdata *)sp->dev_vdata->psp_vdata; 993 if (!psp->vdata) { 994 ret = -ENODEV; 995 dev_err(dev, "missing driver data\n"); 996 goto e_err; 997 } 998 999 psp->io_regs = sp->io_map; 1000 1001 ret = psp_check_sev_support(psp); 1002 if (ret) 1003 goto e_disable; 1004 1005 /* Disable and clear interrupts until ready */ 1006 iowrite32(0, psp->io_regs + psp->vdata->inten_reg); 1007 iowrite32(-1, psp->io_regs + psp->vdata->intsts_reg); 1008 1009 /* Request an irq */ 1010 ret = sp_request_psp_irq(psp->sp, psp_irq_handler, psp->name, psp); 1011 if (ret) { 1012 dev_err(dev, "psp: unable to allocate an IRQ\n"); 1013 goto e_err; 1014 } 1015 1016 ret = sev_misc_init(psp); 1017 if (ret) 1018 goto e_irq; 1019 1020 if (sp->set_psp_master_device) 1021 sp->set_psp_master_device(sp); 1022 1023 /* Enable interrupt */ 1024 iowrite32(-1, psp->io_regs + psp->vdata->inten_reg); 1025 1026 dev_notice(dev, "psp enabled\n"); 1027 1028 return 0; 1029 1030 e_irq: 1031 sp_free_psp_irq(psp->sp, psp); 1032 e_err: 1033 sp->psp_data = NULL; 1034 1035 dev_notice(dev, "psp initialization failed\n"); 1036 1037 return ret; 1038 1039 e_disable: 1040 sp->psp_data = NULL; 1041 1042 return ret; 1043 } 1044 1045 void psp_dev_destroy(struct sp_device *sp) 1046 { 1047 struct psp_device *psp = sp->psp_data; 1048 1049 if (!psp) 1050 return; 1051 1052 if (psp->sev_misc) 1053 kref_put(&misc_dev->refcount, sev_exit); 1054 1055 sp_free_psp_irq(sp, psp); 1056 } 1057 1058 int sev_issue_cmd_external_user(struct file *filep, unsigned int cmd, 1059 void *data, int *error) 1060 { 1061 if (!filep || filep->f_op != &sev_fops) 1062 return -EBADF; 1063 1064 return sev_do_cmd(cmd, data, error); 1065 } 1066 EXPORT_SYMBOL_GPL(sev_issue_cmd_external_user); 1067 1068 void psp_pci_init(void) 1069 { 1070 struct sp_device *sp; 1071 int error, rc; 1072 1073 sp = sp_get_psp_master_device(); 1074 if (!sp) 1075 return; 1076 1077 psp_master = sp->psp_data; 1078 1079 psp_timeout = psp_probe_timeout; 1080 1081 if (sev_get_api_version()) 1082 goto err; 1083 1084 /* 1085 * If platform is not in UNINIT state then firmware upgrade and/or 1086 * platform INIT command will fail. These command require UNINIT state. 1087 * 1088 * In a normal boot we should never run into case where the firmware 1089 * is not in UNINIT state on boot. But in case of kexec boot, a reboot 1090 * may not go through a typical shutdown sequence and may leave the 1091 * firmware in INIT or WORKING state. 1092 */ 1093 1094 if (psp_master->sev_state != SEV_STATE_UNINIT) { 1095 sev_platform_shutdown(NULL); 1096 psp_master->sev_state = SEV_STATE_UNINIT; 1097 } 1098 1099 if (sev_version_greater_or_equal(0, 15) && 1100 sev_update_firmware(psp_master->dev) == 0) 1101 sev_get_api_version(); 1102 1103 /* Initialize the platform */ 1104 rc = sev_platform_init(&error); 1105 if (rc && (error == SEV_RET_SECURE_DATA_INVALID)) { 1106 /* 1107 * INIT command returned an integrity check failure 1108 * status code, meaning that firmware load and 1109 * validation of SEV related persistent data has 1110 * failed and persistent state has been erased. 1111 * Retrying INIT command here should succeed. 1112 */ 1113 dev_dbg(sp->dev, "SEV: retrying INIT command"); 1114 rc = sev_platform_init(&error); 1115 } 1116 1117 if (rc) { 1118 dev_err(sp->dev, "SEV: failed to INIT error %#x\n", error); 1119 return; 1120 } 1121 1122 dev_info(sp->dev, "SEV API:%d.%d build:%d\n", psp_master->api_major, 1123 psp_master->api_minor, psp_master->build); 1124 1125 return; 1126 1127 err: 1128 psp_master = NULL; 1129 } 1130 1131 void psp_pci_exit(void) 1132 { 1133 if (!psp_master) 1134 return; 1135 1136 sev_platform_shutdown(NULL); 1137 } 1138