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 <[email protected]> 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 /* 307 * The SEV spec requires that FACTORY_RESET must be issued in 308 * UNINIT state. Before we go further lets check if any guest is 309 * active. 310 * 311 * If FW is in WORKING state then deny the request otherwise issue 312 * SHUTDOWN command do INIT -> UNINIT before issuing the FACTORY_RESET. 313 * 314 */ 315 rc = sev_get_platform_state(&state, &argp->error); 316 if (rc) 317 return rc; 318 319 if (state == SEV_STATE_WORKING) 320 return -EBUSY; 321 322 if (state == SEV_STATE_INIT) { 323 rc = __sev_platform_shutdown_locked(&argp->error); 324 if (rc) 325 return rc; 326 } 327 328 return __sev_do_cmd_locked(SEV_CMD_FACTORY_RESET, NULL, &argp->error); 329 } 330 331 static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp) 332 { 333 struct sev_user_data_status *data = &psp_master->status_cmd_buf; 334 int ret; 335 336 ret = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, data, &argp->error); 337 if (ret) 338 return ret; 339 340 if (copy_to_user((void __user *)argp->data, data, sizeof(*data))) 341 ret = -EFAULT; 342 343 return ret; 344 } 345 346 static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp) 347 { 348 int rc; 349 350 if (psp_master->sev_state == SEV_STATE_UNINIT) { 351 rc = __sev_platform_init_locked(&argp->error); 352 if (rc) 353 return rc; 354 } 355 356 return __sev_do_cmd_locked(cmd, NULL, &argp->error); 357 } 358 359 static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp) 360 { 361 struct sev_user_data_pek_csr input; 362 struct sev_data_pek_csr *data; 363 void *blob = NULL; 364 int ret; 365 366 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input))) 367 return -EFAULT; 368 369 data = kzalloc(sizeof(*data), GFP_KERNEL); 370 if (!data) 371 return -ENOMEM; 372 373 /* userspace wants to query CSR length */ 374 if (!input.address || !input.length) 375 goto cmd; 376 377 /* allocate a physically contiguous buffer to store the CSR blob */ 378 if (!access_ok(input.address, input.length) || 379 input.length > SEV_FW_BLOB_MAX_SIZE) { 380 ret = -EFAULT; 381 goto e_free; 382 } 383 384 blob = kmalloc(input.length, GFP_KERNEL); 385 if (!blob) { 386 ret = -ENOMEM; 387 goto e_free; 388 } 389 390 data->address = __psp_pa(blob); 391 data->len = input.length; 392 393 cmd: 394 if (psp_master->sev_state == SEV_STATE_UNINIT) { 395 ret = __sev_platform_init_locked(&argp->error); 396 if (ret) 397 goto e_free_blob; 398 } 399 400 ret = __sev_do_cmd_locked(SEV_CMD_PEK_CSR, data, &argp->error); 401 402 /* If we query the CSR length, FW responded with expected data. */ 403 input.length = data->len; 404 405 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) { 406 ret = -EFAULT; 407 goto e_free_blob; 408 } 409 410 if (blob) { 411 if (copy_to_user((void __user *)input.address, blob, input.length)) 412 ret = -EFAULT; 413 } 414 415 e_free_blob: 416 kfree(blob); 417 e_free: 418 kfree(data); 419 return ret; 420 } 421 422 void *psp_copy_user_blob(u64 __user uaddr, u32 len) 423 { 424 if (!uaddr || !len) 425 return ERR_PTR(-EINVAL); 426 427 /* verify that blob length does not exceed our limit */ 428 if (len > SEV_FW_BLOB_MAX_SIZE) 429 return ERR_PTR(-EINVAL); 430 431 return memdup_user((void __user *)(uintptr_t)uaddr, len); 432 } 433 EXPORT_SYMBOL_GPL(psp_copy_user_blob); 434 435 static int sev_get_api_version(void) 436 { 437 struct sev_user_data_status *status; 438 int error = 0, ret; 439 440 status = &psp_master->status_cmd_buf; 441 ret = sev_platform_status(status, &error); 442 if (ret) { 443 dev_err(psp_master->dev, 444 "SEV: failed to get status. Error: %#x\n", error); 445 return 1; 446 } 447 448 psp_master->api_major = status->api_major; 449 psp_master->api_minor = status->api_minor; 450 psp_master->build = status->build; 451 psp_master->sev_state = status->state; 452 453 return 0; 454 } 455 456 static int sev_get_firmware(struct device *dev, 457 const struct firmware **firmware) 458 { 459 char fw_name_specific[SEV_FW_NAME_SIZE]; 460 char fw_name_subset[SEV_FW_NAME_SIZE]; 461 462 snprintf(fw_name_specific, sizeof(fw_name_specific), 463 "amd/amd_sev_fam%.2xh_model%.2xh.sbin", 464 boot_cpu_data.x86, boot_cpu_data.x86_model); 465 466 snprintf(fw_name_subset, sizeof(fw_name_subset), 467 "amd/amd_sev_fam%.2xh_model%.1xxh.sbin", 468 boot_cpu_data.x86, (boot_cpu_data.x86_model & 0xf0) >> 4); 469 470 /* Check for SEV FW for a particular model. 471 * Ex. amd_sev_fam17h_model00h.sbin for Family 17h Model 00h 472 * 473 * or 474 * 475 * Check for SEV FW common to a subset of models. 476 * Ex. amd_sev_fam17h_model0xh.sbin for 477 * Family 17h Model 00h -- Family 17h Model 0Fh 478 * 479 * or 480 * 481 * Fall-back to using generic name: sev.fw 482 */ 483 if ((firmware_request_nowarn(firmware, fw_name_specific, dev) >= 0) || 484 (firmware_request_nowarn(firmware, fw_name_subset, dev) >= 0) || 485 (firmware_request_nowarn(firmware, SEV_FW_FILE, dev) >= 0)) 486 return 0; 487 488 return -ENOENT; 489 } 490 491 /* Don't fail if SEV FW couldn't be updated. Continue with existing SEV FW */ 492 static int sev_update_firmware(struct device *dev) 493 { 494 struct sev_data_download_firmware *data; 495 const struct firmware *firmware; 496 int ret, error, order; 497 struct page *p; 498 u64 data_size; 499 500 if (sev_get_firmware(dev, &firmware) == -ENOENT) { 501 dev_dbg(dev, "No SEV firmware file present\n"); 502 return -1; 503 } 504 505 /* 506 * SEV FW expects the physical address given to it to be 32 507 * byte aligned. Memory allocated has structure placed at the 508 * beginning followed by the firmware being passed to the SEV 509 * FW. Allocate enough memory for data structure + alignment 510 * padding + SEV FW. 511 */ 512 data_size = ALIGN(sizeof(struct sev_data_download_firmware), 32); 513 514 order = get_order(firmware->size + data_size); 515 p = alloc_pages(GFP_KERNEL, order); 516 if (!p) { 517 ret = -1; 518 goto fw_err; 519 } 520 521 /* 522 * Copy firmware data to a kernel allocated contiguous 523 * memory region. 524 */ 525 data = page_address(p); 526 memcpy(page_address(p) + data_size, firmware->data, firmware->size); 527 528 data->address = __psp_pa(page_address(p) + data_size); 529 data->len = firmware->size; 530 531 ret = sev_do_cmd(SEV_CMD_DOWNLOAD_FIRMWARE, data, &error); 532 if (ret) 533 dev_dbg(dev, "Failed to update SEV firmware: %#x\n", error); 534 else 535 dev_info(dev, "SEV firmware update successful\n"); 536 537 __free_pages(p, order); 538 539 fw_err: 540 release_firmware(firmware); 541 542 return ret; 543 } 544 545 static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp) 546 { 547 struct sev_user_data_pek_cert_import input; 548 struct sev_data_pek_cert_import *data; 549 void *pek_blob, *oca_blob; 550 int ret; 551 552 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input))) 553 return -EFAULT; 554 555 data = kzalloc(sizeof(*data), GFP_KERNEL); 556 if (!data) 557 return -ENOMEM; 558 559 /* copy PEK certificate blobs from userspace */ 560 pek_blob = psp_copy_user_blob(input.pek_cert_address, input.pek_cert_len); 561 if (IS_ERR(pek_blob)) { 562 ret = PTR_ERR(pek_blob); 563 goto e_free; 564 } 565 566 data->pek_cert_address = __psp_pa(pek_blob); 567 data->pek_cert_len = input.pek_cert_len; 568 569 /* copy PEK certificate blobs from userspace */ 570 oca_blob = psp_copy_user_blob(input.oca_cert_address, input.oca_cert_len); 571 if (IS_ERR(oca_blob)) { 572 ret = PTR_ERR(oca_blob); 573 goto e_free_pek; 574 } 575 576 data->oca_cert_address = __psp_pa(oca_blob); 577 data->oca_cert_len = input.oca_cert_len; 578 579 /* If platform is not in INIT state then transition it to INIT */ 580 if (psp_master->sev_state != SEV_STATE_INIT) { 581 ret = __sev_platform_init_locked(&argp->error); 582 if (ret) 583 goto e_free_oca; 584 } 585 586 ret = __sev_do_cmd_locked(SEV_CMD_PEK_CERT_IMPORT, data, &argp->error); 587 588 e_free_oca: 589 kfree(oca_blob); 590 e_free_pek: 591 kfree(pek_blob); 592 e_free: 593 kfree(data); 594 return ret; 595 } 596 597 static int sev_ioctl_do_get_id2(struct sev_issue_cmd *argp) 598 { 599 struct sev_user_data_get_id2 input; 600 struct sev_data_get_id *data; 601 void *id_blob = NULL; 602 int ret; 603 604 /* SEV GET_ID is available from SEV API v0.16 and up */ 605 if (!sev_version_greater_or_equal(0, 16)) 606 return -ENOTSUPP; 607 608 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input))) 609 return -EFAULT; 610 611 /* Check if we have write access to the userspace buffer */ 612 if (input.address && 613 input.length && 614 !access_ok(input.address, input.length)) 615 return -EFAULT; 616 617 data = kzalloc(sizeof(*data), GFP_KERNEL); 618 if (!data) 619 return -ENOMEM; 620 621 if (input.address && input.length) { 622 id_blob = kmalloc(input.length, GFP_KERNEL); 623 if (!id_blob) { 624 kfree(data); 625 return -ENOMEM; 626 } 627 628 data->address = __psp_pa(id_blob); 629 data->len = input.length; 630 } 631 632 ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error); 633 634 /* 635 * Firmware will return the length of the ID value (either the minimum 636 * required length or the actual length written), return it to the user. 637 */ 638 input.length = data->len; 639 640 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) { 641 ret = -EFAULT; 642 goto e_free; 643 } 644 645 if (id_blob) { 646 if (copy_to_user((void __user *)input.address, 647 id_blob, data->len)) { 648 ret = -EFAULT; 649 goto e_free; 650 } 651 } 652 653 e_free: 654 kfree(id_blob); 655 kfree(data); 656 657 return ret; 658 } 659 660 static int sev_ioctl_do_get_id(struct sev_issue_cmd *argp) 661 { 662 struct sev_data_get_id *data; 663 u64 data_size, user_size; 664 void *id_blob, *mem; 665 int ret; 666 667 /* SEV GET_ID available from SEV API v0.16 and up */ 668 if (!sev_version_greater_or_equal(0, 16)) 669 return -ENOTSUPP; 670 671 /* SEV FW expects the buffer it fills with the ID to be 672 * 8-byte aligned. Memory allocated should be enough to 673 * hold data structure + alignment padding + memory 674 * where SEV FW writes the ID. 675 */ 676 data_size = ALIGN(sizeof(struct sev_data_get_id), 8); 677 user_size = sizeof(struct sev_user_data_get_id); 678 679 mem = kzalloc(data_size + user_size, GFP_KERNEL); 680 if (!mem) 681 return -ENOMEM; 682 683 data = mem; 684 id_blob = mem + data_size; 685 686 data->address = __psp_pa(id_blob); 687 data->len = user_size; 688 689 ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error); 690 if (!ret) { 691 if (copy_to_user((void __user *)argp->data, id_blob, data->len)) 692 ret = -EFAULT; 693 } 694 695 kfree(mem); 696 697 return ret; 698 } 699 700 static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp) 701 { 702 struct sev_user_data_pdh_cert_export input; 703 void *pdh_blob = NULL, *cert_blob = NULL; 704 struct sev_data_pdh_cert_export *data; 705 int ret; 706 707 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input))) 708 return -EFAULT; 709 710 data = kzalloc(sizeof(*data), GFP_KERNEL); 711 if (!data) 712 return -ENOMEM; 713 714 /* Userspace wants to query the certificate length. */ 715 if (!input.pdh_cert_address || 716 !input.pdh_cert_len || 717 !input.cert_chain_address) 718 goto cmd; 719 720 /* Allocate a physically contiguous buffer to store the PDH blob. */ 721 if ((input.pdh_cert_len > SEV_FW_BLOB_MAX_SIZE) || 722 !access_ok(input.pdh_cert_address, input.pdh_cert_len)) { 723 ret = -EFAULT; 724 goto e_free; 725 } 726 727 /* Allocate a physically contiguous buffer to store the cert chain blob. */ 728 if ((input.cert_chain_len > SEV_FW_BLOB_MAX_SIZE) || 729 !access_ok(input.cert_chain_address, input.cert_chain_len)) { 730 ret = -EFAULT; 731 goto e_free; 732 } 733 734 pdh_blob = kmalloc(input.pdh_cert_len, GFP_KERNEL); 735 if (!pdh_blob) { 736 ret = -ENOMEM; 737 goto e_free; 738 } 739 740 data->pdh_cert_address = __psp_pa(pdh_blob); 741 data->pdh_cert_len = input.pdh_cert_len; 742 743 cert_blob = kmalloc(input.cert_chain_len, GFP_KERNEL); 744 if (!cert_blob) { 745 ret = -ENOMEM; 746 goto e_free_pdh; 747 } 748 749 data->cert_chain_address = __psp_pa(cert_blob); 750 data->cert_chain_len = input.cert_chain_len; 751 752 cmd: 753 /* If platform is not in INIT state then transition it to INIT. */ 754 if (psp_master->sev_state != SEV_STATE_INIT) { 755 ret = __sev_platform_init_locked(&argp->error); 756 if (ret) 757 goto e_free_cert; 758 } 759 760 ret = __sev_do_cmd_locked(SEV_CMD_PDH_CERT_EXPORT, data, &argp->error); 761 762 /* If we query the length, FW responded with expected data. */ 763 input.cert_chain_len = data->cert_chain_len; 764 input.pdh_cert_len = data->pdh_cert_len; 765 766 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) { 767 ret = -EFAULT; 768 goto e_free_cert; 769 } 770 771 if (pdh_blob) { 772 if (copy_to_user((void __user *)input.pdh_cert_address, 773 pdh_blob, input.pdh_cert_len)) { 774 ret = -EFAULT; 775 goto e_free_cert; 776 } 777 } 778 779 if (cert_blob) { 780 if (copy_to_user((void __user *)input.cert_chain_address, 781 cert_blob, input.cert_chain_len)) 782 ret = -EFAULT; 783 } 784 785 e_free_cert: 786 kfree(cert_blob); 787 e_free_pdh: 788 kfree(pdh_blob); 789 e_free: 790 kfree(data); 791 return ret; 792 } 793 794 static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg) 795 { 796 void __user *argp = (void __user *)arg; 797 struct sev_issue_cmd input; 798 int ret = -EFAULT; 799 800 if (!psp_master) 801 return -ENODEV; 802 803 if (ioctl != SEV_ISSUE_CMD) 804 return -EINVAL; 805 806 if (copy_from_user(&input, argp, sizeof(struct sev_issue_cmd))) 807 return -EFAULT; 808 809 if (input.cmd > SEV_MAX) 810 return -EINVAL; 811 812 mutex_lock(&sev_cmd_mutex); 813 814 switch (input.cmd) { 815 816 case SEV_FACTORY_RESET: 817 ret = sev_ioctl_do_reset(&input); 818 break; 819 case SEV_PLATFORM_STATUS: 820 ret = sev_ioctl_do_platform_status(&input); 821 break; 822 case SEV_PEK_GEN: 823 ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PEK_GEN, &input); 824 break; 825 case SEV_PDH_GEN: 826 ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PDH_GEN, &input); 827 break; 828 case SEV_PEK_CSR: 829 ret = sev_ioctl_do_pek_csr(&input); 830 break; 831 case SEV_PEK_CERT_IMPORT: 832 ret = sev_ioctl_do_pek_import(&input); 833 break; 834 case SEV_PDH_CERT_EXPORT: 835 ret = sev_ioctl_do_pdh_export(&input); 836 break; 837 case SEV_GET_ID: 838 pr_warn_once("SEV_GET_ID command is deprecated, use SEV_GET_ID2\n"); 839 ret = sev_ioctl_do_get_id(&input); 840 break; 841 case SEV_GET_ID2: 842 ret = sev_ioctl_do_get_id2(&input); 843 break; 844 default: 845 ret = -EINVAL; 846 goto out; 847 } 848 849 if (copy_to_user(argp, &input, sizeof(struct sev_issue_cmd))) 850 ret = -EFAULT; 851 out: 852 mutex_unlock(&sev_cmd_mutex); 853 854 return ret; 855 } 856 857 static const struct file_operations sev_fops = { 858 .owner = THIS_MODULE, 859 .unlocked_ioctl = sev_ioctl, 860 }; 861 862 int sev_platform_status(struct sev_user_data_status *data, int *error) 863 { 864 return sev_do_cmd(SEV_CMD_PLATFORM_STATUS, data, error); 865 } 866 EXPORT_SYMBOL_GPL(sev_platform_status); 867 868 int sev_guest_deactivate(struct sev_data_deactivate *data, int *error) 869 { 870 return sev_do_cmd(SEV_CMD_DEACTIVATE, data, error); 871 } 872 EXPORT_SYMBOL_GPL(sev_guest_deactivate); 873 874 int sev_guest_activate(struct sev_data_activate *data, int *error) 875 { 876 return sev_do_cmd(SEV_CMD_ACTIVATE, data, error); 877 } 878 EXPORT_SYMBOL_GPL(sev_guest_activate); 879 880 int sev_guest_decommission(struct sev_data_decommission *data, int *error) 881 { 882 return sev_do_cmd(SEV_CMD_DECOMMISSION, data, error); 883 } 884 EXPORT_SYMBOL_GPL(sev_guest_decommission); 885 886 int sev_guest_df_flush(int *error) 887 { 888 return sev_do_cmd(SEV_CMD_DF_FLUSH, NULL, error); 889 } 890 EXPORT_SYMBOL_GPL(sev_guest_df_flush); 891 892 static void sev_exit(struct kref *ref) 893 { 894 struct sev_misc_dev *misc_dev = container_of(ref, struct sev_misc_dev, refcount); 895 896 misc_deregister(&misc_dev->misc); 897 } 898 899 static int sev_misc_init(struct psp_device *psp) 900 { 901 struct device *dev = psp->dev; 902 int ret; 903 904 /* 905 * SEV feature support can be detected on multiple devices but the SEV 906 * FW commands must be issued on the master. During probe, we do not 907 * know the master hence we create /dev/sev on the first device probe. 908 * sev_do_cmd() finds the right master device to which to issue the 909 * command to the firmware. 910 */ 911 if (!misc_dev) { 912 struct miscdevice *misc; 913 914 misc_dev = devm_kzalloc(dev, sizeof(*misc_dev), GFP_KERNEL); 915 if (!misc_dev) 916 return -ENOMEM; 917 918 misc = &misc_dev->misc; 919 misc->minor = MISC_DYNAMIC_MINOR; 920 misc->name = DEVICE_NAME; 921 misc->fops = &sev_fops; 922 923 ret = misc_register(misc); 924 if (ret) 925 return ret; 926 927 kref_init(&misc_dev->refcount); 928 } else { 929 kref_get(&misc_dev->refcount); 930 } 931 932 init_waitqueue_head(&psp->sev_int_queue); 933 psp->sev_misc = misc_dev; 934 dev_dbg(dev, "registered SEV device\n"); 935 936 return 0; 937 } 938 939 static int psp_check_sev_support(struct psp_device *psp) 940 { 941 /* Check if device supports SEV feature */ 942 if (!(ioread32(psp->io_regs + psp->vdata->feature_reg) & 1)) { 943 dev_dbg(psp->dev, "psp does not support SEV\n"); 944 return -ENODEV; 945 } 946 947 return 0; 948 } 949 950 int psp_dev_init(struct sp_device *sp) 951 { 952 struct device *dev = sp->dev; 953 struct psp_device *psp; 954 int ret; 955 956 ret = -ENOMEM; 957 psp = psp_alloc_struct(sp); 958 if (!psp) 959 goto e_err; 960 961 sp->psp_data = psp; 962 963 psp->vdata = (struct psp_vdata *)sp->dev_vdata->psp_vdata; 964 if (!psp->vdata) { 965 ret = -ENODEV; 966 dev_err(dev, "missing driver data\n"); 967 goto e_err; 968 } 969 970 psp->io_regs = sp->io_map; 971 972 ret = psp_check_sev_support(psp); 973 if (ret) 974 goto e_disable; 975 976 /* Disable and clear interrupts until ready */ 977 iowrite32(0, psp->io_regs + psp->vdata->inten_reg); 978 iowrite32(-1, psp->io_regs + psp->vdata->intsts_reg); 979 980 /* Request an irq */ 981 ret = sp_request_psp_irq(psp->sp, psp_irq_handler, psp->name, psp); 982 if (ret) { 983 dev_err(dev, "psp: unable to allocate an IRQ\n"); 984 goto e_err; 985 } 986 987 ret = sev_misc_init(psp); 988 if (ret) 989 goto e_irq; 990 991 if (sp->set_psp_master_device) 992 sp->set_psp_master_device(sp); 993 994 /* Enable interrupt */ 995 iowrite32(-1, psp->io_regs + psp->vdata->inten_reg); 996 997 dev_notice(dev, "psp enabled\n"); 998 999 return 0; 1000 1001 e_irq: 1002 sp_free_psp_irq(psp->sp, psp); 1003 e_err: 1004 sp->psp_data = NULL; 1005 1006 dev_notice(dev, "psp initialization failed\n"); 1007 1008 return ret; 1009 1010 e_disable: 1011 sp->psp_data = NULL; 1012 1013 return ret; 1014 } 1015 1016 void psp_dev_destroy(struct sp_device *sp) 1017 { 1018 struct psp_device *psp = sp->psp_data; 1019 1020 if (!psp) 1021 return; 1022 1023 if (psp->sev_misc) 1024 kref_put(&misc_dev->refcount, sev_exit); 1025 1026 sp_free_psp_irq(sp, psp); 1027 } 1028 1029 int sev_issue_cmd_external_user(struct file *filep, unsigned int cmd, 1030 void *data, int *error) 1031 { 1032 if (!filep || filep->f_op != &sev_fops) 1033 return -EBADF; 1034 1035 return sev_do_cmd(cmd, data, error); 1036 } 1037 EXPORT_SYMBOL_GPL(sev_issue_cmd_external_user); 1038 1039 void psp_pci_init(void) 1040 { 1041 struct sp_device *sp; 1042 int error, rc; 1043 1044 sp = sp_get_psp_master_device(); 1045 if (!sp) 1046 return; 1047 1048 psp_master = sp->psp_data; 1049 1050 psp_timeout = psp_probe_timeout; 1051 1052 if (sev_get_api_version()) 1053 goto err; 1054 1055 /* 1056 * If platform is not in UNINIT state then firmware upgrade and/or 1057 * platform INIT command will fail. These command require UNINIT state. 1058 * 1059 * In a normal boot we should never run into case where the firmware 1060 * is not in UNINIT state on boot. But in case of kexec boot, a reboot 1061 * may not go through a typical shutdown sequence and may leave the 1062 * firmware in INIT or WORKING state. 1063 */ 1064 1065 if (psp_master->sev_state != SEV_STATE_UNINIT) { 1066 sev_platform_shutdown(NULL); 1067 psp_master->sev_state = SEV_STATE_UNINIT; 1068 } 1069 1070 if (sev_version_greater_or_equal(0, 15) && 1071 sev_update_firmware(psp_master->dev) == 0) 1072 sev_get_api_version(); 1073 1074 /* Initialize the platform */ 1075 rc = sev_platform_init(&error); 1076 if (rc) { 1077 dev_err(sp->dev, "SEV: failed to INIT error %#x\n", error); 1078 return; 1079 } 1080 1081 dev_info(sp->dev, "SEV API:%d.%d build:%d\n", psp_master->api_major, 1082 psp_master->api_minor, psp_master->build); 1083 1084 return; 1085 1086 err: 1087 psp_master = NULL; 1088 } 1089 1090 void psp_pci_exit(void) 1091 { 1092 if (!psp_master) 1093 return; 1094 1095 sev_platform_shutdown(NULL); 1096 } 1097