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