1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * AMD Secure Encrypted Virtualization (SEV) interface 4 * 5 * Copyright (C) 2016,2019 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#include <linux/gfp.h> 24 25#include <asm/smp.h> 26#include <asm/cacheflush.h> 27 28#include "psp-dev.h" 29#include "sev-dev.h" 30 31#define DEVICE_NAME "sev" 32#define SEV_FW_FILE "amd/sev.fw" 33#define SEV_FW_NAME_SIZE 64 34 35static DEFINE_MUTEX(sev_cmd_mutex); 36static struct sev_misc_dev *misc_dev; 37 38static int psp_cmd_timeout = 100; 39module_param(psp_cmd_timeout, int, 0644); 40MODULE_PARM_DESC(psp_cmd_timeout, " default timeout value, in seconds, for PSP commands"); 41 42static int psp_probe_timeout = 5; 43module_param(psp_probe_timeout, int, 0644); 44MODULE_PARM_DESC(psp_probe_timeout, " default timeout value, in seconds, during PSP device probe"); 45 46MODULE_FIRMWARE("amd/amd_sev_fam17h_model0xh.sbin"); /* 1st gen EPYC */ 47MODULE_FIRMWARE("amd/amd_sev_fam17h_model3xh.sbin"); /* 2nd gen EPYC */ 48MODULE_FIRMWARE("amd/amd_sev_fam19h_model0xh.sbin"); /* 3rd gen EPYC */ 49 50static bool psp_dead; 51static int psp_timeout; 52 53/* Trusted Memory Region (TMR): 54 * The TMR is a 1MB area that must be 1MB aligned. Use the page allocator 55 * to allocate the memory, which will return aligned memory for the specified 56 * allocation order. 57 */ 58#define SEV_ES_TMR_SIZE (1024 * 1024) 59static void *sev_es_tmr; 60 61static inline bool sev_version_greater_or_equal(u8 maj, u8 min) 62{ 63 struct sev_device *sev = psp_master->sev_data; 64 65 if (sev->api_major > maj) 66 return true; 67 68 if (sev->api_major == maj && sev->api_minor >= min) 69 return true; 70 71 return false; 72} 73 74static void sev_irq_handler(int irq, void *data, unsigned int status) 75{ 76 struct sev_device *sev = data; 77 int reg; 78 79 /* Check if it is command completion: */ 80 if (!(status & SEV_CMD_COMPLETE)) 81 return; 82 83 /* Check if it is SEV command completion: */ 84 reg = ioread32(sev->io_regs + sev->vdata->cmdresp_reg); 85 if (reg & PSP_CMDRESP_RESP) { 86 sev->int_rcvd = 1; 87 wake_up(&sev->int_queue); 88 } 89} 90 91static int sev_wait_cmd_ioc(struct sev_device *sev, 92 unsigned int *reg, unsigned int timeout) 93{ 94 int ret; 95 96 ret = wait_event_timeout(sev->int_queue, 97 sev->int_rcvd, timeout * HZ); 98 if (!ret) 99 return -ETIMEDOUT; 100 101 *reg = ioread32(sev->io_regs + sev->vdata->cmdresp_reg); 102 103 return 0; 104} 105 106static int sev_cmd_buffer_len(int cmd) 107{ 108 switch (cmd) { 109 case SEV_CMD_INIT: return sizeof(struct sev_data_init); 110 case SEV_CMD_PLATFORM_STATUS: return sizeof(struct sev_user_data_status); 111 case SEV_CMD_PEK_CSR: return sizeof(struct sev_data_pek_csr); 112 case SEV_CMD_PEK_CERT_IMPORT: return sizeof(struct sev_data_pek_cert_import); 113 case SEV_CMD_PDH_CERT_EXPORT: return sizeof(struct sev_data_pdh_cert_export); 114 case SEV_CMD_LAUNCH_START: return sizeof(struct sev_data_launch_start); 115 case SEV_CMD_LAUNCH_UPDATE_DATA: return sizeof(struct sev_data_launch_update_data); 116 case SEV_CMD_LAUNCH_UPDATE_VMSA: return sizeof(struct sev_data_launch_update_vmsa); 117 case SEV_CMD_LAUNCH_FINISH: return sizeof(struct sev_data_launch_finish); 118 case SEV_CMD_LAUNCH_MEASURE: return sizeof(struct sev_data_launch_measure); 119 case SEV_CMD_ACTIVATE: return sizeof(struct sev_data_activate); 120 case SEV_CMD_DEACTIVATE: return sizeof(struct sev_data_deactivate); 121 case SEV_CMD_DECOMMISSION: return sizeof(struct sev_data_decommission); 122 case SEV_CMD_GUEST_STATUS: return sizeof(struct sev_data_guest_status); 123 case SEV_CMD_DBG_DECRYPT: return sizeof(struct sev_data_dbg); 124 case SEV_CMD_DBG_ENCRYPT: return sizeof(struct sev_data_dbg); 125 case SEV_CMD_SEND_START: return sizeof(struct sev_data_send_start); 126 case SEV_CMD_SEND_UPDATE_DATA: return sizeof(struct sev_data_send_update_data); 127 case SEV_CMD_SEND_UPDATE_VMSA: return sizeof(struct sev_data_send_update_vmsa); 128 case SEV_CMD_SEND_FINISH: return sizeof(struct sev_data_send_finish); 129 case SEV_CMD_RECEIVE_START: return sizeof(struct sev_data_receive_start); 130 case SEV_CMD_RECEIVE_FINISH: return sizeof(struct sev_data_receive_finish); 131 case SEV_CMD_RECEIVE_UPDATE_DATA: return sizeof(struct sev_data_receive_update_data); 132 case SEV_CMD_RECEIVE_UPDATE_VMSA: return sizeof(struct sev_data_receive_update_vmsa); 133 case SEV_CMD_LAUNCH_UPDATE_SECRET: return sizeof(struct sev_data_launch_secret); 134 case SEV_CMD_DOWNLOAD_FIRMWARE: return sizeof(struct sev_data_download_firmware); 135 case SEV_CMD_GET_ID: return sizeof(struct sev_data_get_id); 136 default: return 0; 137 } 138 139 return 0; 140} 141 142static void *sev_fw_alloc(unsigned long len) 143{ 144 struct page *page; 145 146 page = alloc_pages(GFP_KERNEL, get_order(len)); 147 if (!page) 148 return NULL; 149 150 return page_address(page); 151} 152 153static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret) 154{ 155 struct psp_device *psp = psp_master; 156 struct sev_device *sev; 157 unsigned int phys_lsb, phys_msb; 158 unsigned int reg, ret = 0; 159 int buf_len; 160 161 if (!psp || !psp->sev_data) 162 return -ENODEV; 163 164 if (psp_dead) 165 return -EBUSY; 166 167 sev = psp->sev_data; 168 169 buf_len = sev_cmd_buffer_len(cmd); 170 if (WARN_ON_ONCE(!data != !buf_len)) 171 return -EINVAL; 172 173 /* 174 * Copy the incoming data to driver's scratch buffer as __pa() will not 175 * work for some memory, e.g. vmalloc'd addresses, and @data may not be 176 * physically contiguous. 177 */ 178 if (data) 179 memcpy(sev->cmd_buf, data, buf_len); 180 181 /* Get the physical address of the command buffer */ 182 phys_lsb = data ? lower_32_bits(__psp_pa(sev->cmd_buf)) : 0; 183 phys_msb = data ? upper_32_bits(__psp_pa(sev->cmd_buf)) : 0; 184 185 dev_dbg(sev->dev, "sev command id %#x buffer 0x%08x%08x timeout %us\n", 186 cmd, phys_msb, phys_lsb, psp_timeout); 187 188 print_hex_dump_debug("(in): ", DUMP_PREFIX_OFFSET, 16, 2, data, 189 buf_len, false); 190 191 iowrite32(phys_lsb, sev->io_regs + sev->vdata->cmdbuff_addr_lo_reg); 192 iowrite32(phys_msb, sev->io_regs + sev->vdata->cmdbuff_addr_hi_reg); 193 194 sev->int_rcvd = 0; 195 196 reg = cmd; 197 reg <<= SEV_CMDRESP_CMD_SHIFT; 198 reg |= SEV_CMDRESP_IOC; 199 iowrite32(reg, sev->io_regs + sev->vdata->cmdresp_reg); 200 201 /* wait for command completion */ 202 ret = sev_wait_cmd_ioc(sev, ®, psp_timeout); 203 if (ret) { 204 if (psp_ret) 205 *psp_ret = 0; 206 207 dev_err(sev->dev, "sev command %#x timed out, disabling PSP\n", cmd); 208 psp_dead = true; 209 210 return ret; 211 } 212 213 psp_timeout = psp_cmd_timeout; 214 215 if (psp_ret) 216 *psp_ret = reg & PSP_CMDRESP_ERR_MASK; 217 218 if (reg & PSP_CMDRESP_ERR_MASK) { 219 dev_dbg(sev->dev, "sev command %#x failed (%#010x)\n", 220 cmd, reg & PSP_CMDRESP_ERR_MASK); 221 ret = -EIO; 222 } 223 224 print_hex_dump_debug("(out): ", DUMP_PREFIX_OFFSET, 16, 2, data, 225 buf_len, false); 226 227 /* 228 * Copy potential output from the PSP back to data. Do this even on 229 * failure in case the caller wants to glean something from the error. 230 */ 231 if (data) 232 memcpy(data, sev->cmd_buf, buf_len); 233 234 return ret; 235} 236 237static int sev_do_cmd(int cmd, void *data, int *psp_ret) 238{ 239 int rc; 240 241 mutex_lock(&sev_cmd_mutex); 242 rc = __sev_do_cmd_locked(cmd, data, psp_ret); 243 mutex_unlock(&sev_cmd_mutex); 244 245 return rc; 246} 247 248static int __sev_platform_init_locked(int *error) 249{ 250 struct psp_device *psp = psp_master; 251 struct sev_device *sev; 252 int rc = 0; 253 254 if (!psp || !psp->sev_data) 255 return -ENODEV; 256 257 sev = psp->sev_data; 258 259 if (sev->state == SEV_STATE_INIT) 260 return 0; 261 262 if (sev_es_tmr) { 263 u64 tmr_pa; 264 265 /* 266 * Do not include the encryption mask on the physical 267 * address of the TMR (firmware should clear it anyway). 268 */ 269 tmr_pa = __pa(sev_es_tmr); 270 271 sev->init_cmd_buf.flags |= SEV_INIT_FLAGS_SEV_ES; 272 sev->init_cmd_buf.tmr_address = tmr_pa; 273 sev->init_cmd_buf.tmr_len = SEV_ES_TMR_SIZE; 274 } 275 276 rc = __sev_do_cmd_locked(SEV_CMD_INIT, &sev->init_cmd_buf, error); 277 if (rc) 278 return rc; 279 280 sev->state = SEV_STATE_INIT; 281 282 /* Prepare for first SEV guest launch after INIT */ 283 wbinvd_on_all_cpus(); 284 rc = __sev_do_cmd_locked(SEV_CMD_DF_FLUSH, NULL, error); 285 if (rc) 286 return rc; 287 288 dev_dbg(sev->dev, "SEV firmware initialized\n"); 289 290 return rc; 291} 292 293int sev_platform_init(int *error) 294{ 295 int rc; 296 297 mutex_lock(&sev_cmd_mutex); 298 rc = __sev_platform_init_locked(error); 299 mutex_unlock(&sev_cmd_mutex); 300 301 return rc; 302} 303EXPORT_SYMBOL_GPL(sev_platform_init); 304 305static int __sev_platform_shutdown_locked(int *error) 306{ 307 struct psp_device *psp = psp_master; 308 struct sev_device *sev; 309 int ret; 310 311 if (!psp || !psp->sev_data) 312 return 0; 313 314 sev = psp->sev_data; 315 316 if (sev->state == SEV_STATE_UNINIT) 317 return 0; 318 319 ret = __sev_do_cmd_locked(SEV_CMD_SHUTDOWN, NULL, error); 320 if (ret) 321 return ret; 322 323 sev->state = SEV_STATE_UNINIT; 324 dev_dbg(sev->dev, "SEV firmware shutdown\n"); 325 326 return ret; 327} 328 329static int sev_platform_shutdown(int *error) 330{ 331 int rc; 332 333 mutex_lock(&sev_cmd_mutex); 334 rc = __sev_platform_shutdown_locked(NULL); 335 mutex_unlock(&sev_cmd_mutex); 336 337 return rc; 338} 339 340static int sev_get_platform_state(int *state, int *error) 341{ 342 struct sev_user_data_status data; 343 int rc; 344 345 rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, &data, error); 346 if (rc) 347 return rc; 348 349 *state = data.state; 350 return rc; 351} 352 353static int sev_ioctl_do_reset(struct sev_issue_cmd *argp, bool writable) 354{ 355 int state, rc; 356 357 if (!writable) 358 return -EPERM; 359 360 /* 361 * The SEV spec requires that FACTORY_RESET must be issued in 362 * UNINIT state. Before we go further lets check if any guest is 363 * active. 364 * 365 * If FW is in WORKING state then deny the request otherwise issue 366 * SHUTDOWN command do INIT -> UNINIT before issuing the FACTORY_RESET. 367 * 368 */ 369 rc = sev_get_platform_state(&state, &argp->error); 370 if (rc) 371 return rc; 372 373 if (state == SEV_STATE_WORKING) 374 return -EBUSY; 375 376 if (state == SEV_STATE_INIT) { 377 rc = __sev_platform_shutdown_locked(&argp->error); 378 if (rc) 379 return rc; 380 } 381 382 return __sev_do_cmd_locked(SEV_CMD_FACTORY_RESET, NULL, &argp->error); 383} 384 385static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp) 386{ 387 struct sev_user_data_status data; 388 int ret; 389 390 memset(&data, 0, sizeof(data)); 391 392 ret = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, &data, &argp->error); 393 if (ret) 394 return ret; 395 396 if (copy_to_user((void __user *)argp->data, &data, sizeof(data))) 397 ret = -EFAULT; 398 399 return ret; 400} 401 402static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp, bool writable) 403{ 404 struct sev_device *sev = psp_master->sev_data; 405 int rc; 406 407 if (!writable) 408 return -EPERM; 409 410 if (sev->state == SEV_STATE_UNINIT) { 411 rc = __sev_platform_init_locked(&argp->error); 412 if (rc) 413 return rc; 414 } 415 416 return __sev_do_cmd_locked(cmd, NULL, &argp->error); 417} 418 419static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp, bool writable) 420{ 421 struct sev_device *sev = psp_master->sev_data; 422 struct sev_user_data_pek_csr input; 423 struct sev_data_pek_csr data; 424 void __user *input_address; 425 void *blob = NULL; 426 int ret; 427 428 if (!writable) 429 return -EPERM; 430 431 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input))) 432 return -EFAULT; 433 434 memset(&data, 0, sizeof(data)); 435 436 /* userspace wants to query CSR length */ 437 if (!input.address || !input.length) 438 goto cmd; 439 440 /* allocate a physically contiguous buffer to store the CSR blob */ 441 input_address = (void __user *)input.address; 442 if (input.length > SEV_FW_BLOB_MAX_SIZE) 443 return -EFAULT; 444 445 blob = kzalloc(input.length, GFP_KERNEL); 446 if (!blob) 447 return -ENOMEM; 448 449 data.address = __psp_pa(blob); 450 data.len = input.length; 451 452cmd: 453 if (sev->state == SEV_STATE_UNINIT) { 454 ret = __sev_platform_init_locked(&argp->error); 455 if (ret) 456 goto e_free_blob; 457 } 458 459 ret = __sev_do_cmd_locked(SEV_CMD_PEK_CSR, &data, &argp->error); 460 461 /* If we query the CSR length, FW responded with expected data. */ 462 input.length = data.len; 463 464 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) { 465 ret = -EFAULT; 466 goto e_free_blob; 467 } 468 469 if (blob) { 470 if (copy_to_user(input_address, blob, input.length)) 471 ret = -EFAULT; 472 } 473 474e_free_blob: 475 kfree(blob); 476 return ret; 477} 478 479void *psp_copy_user_blob(u64 uaddr, u32 len) 480{ 481 if (!uaddr || !len) 482 return ERR_PTR(-EINVAL); 483 484 /* verify that blob length does not exceed our limit */ 485 if (len > SEV_FW_BLOB_MAX_SIZE) 486 return ERR_PTR(-EINVAL); 487 488 return memdup_user((void __user *)uaddr, len); 489} 490EXPORT_SYMBOL_GPL(psp_copy_user_blob); 491 492static int sev_get_api_version(void) 493{ 494 struct sev_device *sev = psp_master->sev_data; 495 struct sev_user_data_status status; 496 int error = 0, ret; 497 498 ret = sev_platform_status(&status, &error); 499 if (ret) { 500 dev_err(sev->dev, 501 "SEV: failed to get status. Error: %#x\n", error); 502 return 1; 503 } 504 505 sev->api_major = status.api_major; 506 sev->api_minor = status.api_minor; 507 sev->build = status.build; 508 sev->state = status.state; 509 510 return 0; 511} 512 513static int sev_get_firmware(struct device *dev, 514 const struct firmware **firmware) 515{ 516 char fw_name_specific[SEV_FW_NAME_SIZE]; 517 char fw_name_subset[SEV_FW_NAME_SIZE]; 518 519 snprintf(fw_name_specific, sizeof(fw_name_specific), 520 "amd/amd_sev_fam%.2xh_model%.2xh.sbin", 521 boot_cpu_data.x86, boot_cpu_data.x86_model); 522 523 snprintf(fw_name_subset, sizeof(fw_name_subset), 524 "amd/amd_sev_fam%.2xh_model%.1xxh.sbin", 525 boot_cpu_data.x86, (boot_cpu_data.x86_model & 0xf0) >> 4); 526 527 /* Check for SEV FW for a particular model. 528 * Ex. amd_sev_fam17h_model00h.sbin for Family 17h Model 00h 529 * 530 * or 531 * 532 * Check for SEV FW common to a subset of models. 533 * Ex. amd_sev_fam17h_model0xh.sbin for 534 * Family 17h Model 00h -- Family 17h Model 0Fh 535 * 536 * or 537 * 538 * Fall-back to using generic name: sev.fw 539 */ 540 if ((firmware_request_nowarn(firmware, fw_name_specific, dev) >= 0) || 541 (firmware_request_nowarn(firmware, fw_name_subset, dev) >= 0) || 542 (firmware_request_nowarn(firmware, SEV_FW_FILE, dev) >= 0)) 543 return 0; 544 545 return -ENOENT; 546} 547 548/* Don't fail if SEV FW couldn't be updated. Continue with existing SEV FW */ 549static int sev_update_firmware(struct device *dev) 550{ 551 struct sev_data_download_firmware *data; 552 const struct firmware *firmware; 553 int ret, error, order; 554 struct page *p; 555 u64 data_size; 556 557 if (sev_get_firmware(dev, &firmware) == -ENOENT) { 558 dev_dbg(dev, "No SEV firmware file present\n"); 559 return -1; 560 } 561 562 /* 563 * SEV FW expects the physical address given to it to be 32 564 * byte aligned. Memory allocated has structure placed at the 565 * beginning followed by the firmware being passed to the SEV 566 * FW. Allocate enough memory for data structure + alignment 567 * padding + SEV FW. 568 */ 569 data_size = ALIGN(sizeof(struct sev_data_download_firmware), 32); 570 571 order = get_order(firmware->size + data_size); 572 p = alloc_pages(GFP_KERNEL, order); 573 if (!p) { 574 ret = -1; 575 goto fw_err; 576 } 577 578 /* 579 * Copy firmware data to a kernel allocated contiguous 580 * memory region. 581 */ 582 data = page_address(p); 583 memcpy(page_address(p) + data_size, firmware->data, firmware->size); 584 585 data->address = __psp_pa(page_address(p) + data_size); 586 data->len = firmware->size; 587 588 ret = sev_do_cmd(SEV_CMD_DOWNLOAD_FIRMWARE, data, &error); 589 if (ret) 590 dev_dbg(dev, "Failed to update SEV firmware: %#x\n", error); 591 else 592 dev_info(dev, "SEV firmware update successful\n"); 593 594 __free_pages(p, order); 595 596fw_err: 597 release_firmware(firmware); 598 599 return ret; 600} 601 602static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp, bool writable) 603{ 604 struct sev_device *sev = psp_master->sev_data; 605 struct sev_user_data_pek_cert_import input; 606 struct sev_data_pek_cert_import data; 607 void *pek_blob, *oca_blob; 608 int ret; 609 610 if (!writable) 611 return -EPERM; 612 613 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input))) 614 return -EFAULT; 615 616 /* copy PEK certificate blobs from userspace */ 617 pek_blob = psp_copy_user_blob(input.pek_cert_address, input.pek_cert_len); 618 if (IS_ERR(pek_blob)) 619 return PTR_ERR(pek_blob); 620 621 data.reserved = 0; 622 data.pek_cert_address = __psp_pa(pek_blob); 623 data.pek_cert_len = input.pek_cert_len; 624 625 /* copy PEK certificate blobs from userspace */ 626 oca_blob = psp_copy_user_blob(input.oca_cert_address, input.oca_cert_len); 627 if (IS_ERR(oca_blob)) { 628 ret = PTR_ERR(oca_blob); 629 goto e_free_pek; 630 } 631 632 data.oca_cert_address = __psp_pa(oca_blob); 633 data.oca_cert_len = input.oca_cert_len; 634 635 /* If platform is not in INIT state then transition it to INIT */ 636 if (sev->state != SEV_STATE_INIT) { 637 ret = __sev_platform_init_locked(&argp->error); 638 if (ret) 639 goto e_free_oca; 640 } 641 642 ret = __sev_do_cmd_locked(SEV_CMD_PEK_CERT_IMPORT, &data, &argp->error); 643 644e_free_oca: 645 kfree(oca_blob); 646e_free_pek: 647 kfree(pek_blob); 648 return ret; 649} 650 651static int sev_ioctl_do_get_id2(struct sev_issue_cmd *argp) 652{ 653 struct sev_user_data_get_id2 input; 654 struct sev_data_get_id data; 655 void __user *input_address; 656 void *id_blob = NULL; 657 int ret; 658 659 /* SEV GET_ID is available from SEV API v0.16 and up */ 660 if (!sev_version_greater_or_equal(0, 16)) 661 return -ENOTSUPP; 662 663 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input))) 664 return -EFAULT; 665 666 input_address = (void __user *)input.address; 667 668 if (input.address && input.length) { 669 /* 670 * The length of the ID shouldn't be assumed by software since 671 * it may change in the future. The allocation size is limited 672 * to 1 << (PAGE_SHIFT + MAX_ORDER - 1) by the page allocator. 673 * If the allocation fails, simply return ENOMEM rather than 674 * warning in the kernel log. 675 */ 676 id_blob = kzalloc(input.length, GFP_KERNEL | __GFP_NOWARN); 677 if (!id_blob) 678 return -ENOMEM; 679 680 data.address = __psp_pa(id_blob); 681 data.len = input.length; 682 } else { 683 data.address = 0; 684 data.len = 0; 685 } 686 687 ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, &data, &argp->error); 688 689 /* 690 * Firmware will return the length of the ID value (either the minimum 691 * required length or the actual length written), return it to the user. 692 */ 693 input.length = data.len; 694 695 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) { 696 ret = -EFAULT; 697 goto e_free; 698 } 699 700 if (id_blob) { 701 if (copy_to_user(input_address, id_blob, data.len)) { 702 ret = -EFAULT; 703 goto e_free; 704 } 705 } 706 707e_free: 708 kfree(id_blob); 709 710 return ret; 711} 712 713static int sev_ioctl_do_get_id(struct sev_issue_cmd *argp) 714{ 715 struct sev_data_get_id *data; 716 u64 data_size, user_size; 717 void *id_blob, *mem; 718 int ret; 719 720 /* SEV GET_ID available from SEV API v0.16 and up */ 721 if (!sev_version_greater_or_equal(0, 16)) 722 return -ENOTSUPP; 723 724 /* SEV FW expects the buffer it fills with the ID to be 725 * 8-byte aligned. Memory allocated should be enough to 726 * hold data structure + alignment padding + memory 727 * where SEV FW writes the ID. 728 */ 729 data_size = ALIGN(sizeof(struct sev_data_get_id), 8); 730 user_size = sizeof(struct sev_user_data_get_id); 731 732 mem = kzalloc(data_size + user_size, GFP_KERNEL); 733 if (!mem) 734 return -ENOMEM; 735 736 data = mem; 737 id_blob = mem + data_size; 738 739 data->address = __psp_pa(id_blob); 740 data->len = user_size; 741 742 ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error); 743 if (!ret) { 744 if (copy_to_user((void __user *)argp->data, id_blob, data->len)) 745 ret = -EFAULT; 746 } 747 748 kfree(mem); 749 750 return ret; 751} 752 753static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp, bool writable) 754{ 755 struct sev_device *sev = psp_master->sev_data; 756 struct sev_user_data_pdh_cert_export input; 757 void *pdh_blob = NULL, *cert_blob = NULL; 758 struct sev_data_pdh_cert_export data; 759 void __user *input_cert_chain_address; 760 void __user *input_pdh_cert_address; 761 int ret; 762 763 /* If platform is not in INIT state then transition it to INIT. */ 764 if (sev->state != SEV_STATE_INIT) { 765 if (!writable) 766 return -EPERM; 767 768 ret = __sev_platform_init_locked(&argp->error); 769 if (ret) 770 return ret; 771 } 772 773 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input))) 774 return -EFAULT; 775 776 memset(&data, 0, sizeof(data)); 777 778 /* Userspace wants to query the certificate length. */ 779 if (!input.pdh_cert_address || 780 !input.pdh_cert_len || 781 !input.cert_chain_address) 782 goto cmd; 783 784 input_pdh_cert_address = (void __user *)input.pdh_cert_address; 785 input_cert_chain_address = (void __user *)input.cert_chain_address; 786 787 /* Allocate a physically contiguous buffer to store the PDH blob. */ 788 if (input.pdh_cert_len > SEV_FW_BLOB_MAX_SIZE) 789 return -EFAULT; 790 791 /* Allocate a physically contiguous buffer to store the cert chain blob. */ 792 if (input.cert_chain_len > SEV_FW_BLOB_MAX_SIZE) 793 return -EFAULT; 794 795 pdh_blob = kzalloc(input.pdh_cert_len, GFP_KERNEL); 796 if (!pdh_blob) 797 return -ENOMEM; 798 799 data.pdh_cert_address = __psp_pa(pdh_blob); 800 data.pdh_cert_len = input.pdh_cert_len; 801 802 cert_blob = kzalloc(input.cert_chain_len, GFP_KERNEL); 803 if (!cert_blob) { 804 ret = -ENOMEM; 805 goto e_free_pdh; 806 } 807 808 data.cert_chain_address = __psp_pa(cert_blob); 809 data.cert_chain_len = input.cert_chain_len; 810 811cmd: 812 ret = __sev_do_cmd_locked(SEV_CMD_PDH_CERT_EXPORT, &data, &argp->error); 813 814 /* If we query the length, FW responded with expected data. */ 815 input.cert_chain_len = data.cert_chain_len; 816 input.pdh_cert_len = data.pdh_cert_len; 817 818 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) { 819 ret = -EFAULT; 820 goto e_free_cert; 821 } 822 823 if (pdh_blob) { 824 if (copy_to_user(input_pdh_cert_address, 825 pdh_blob, input.pdh_cert_len)) { 826 ret = -EFAULT; 827 goto e_free_cert; 828 } 829 } 830 831 if (cert_blob) { 832 if (copy_to_user(input_cert_chain_address, 833 cert_blob, input.cert_chain_len)) 834 ret = -EFAULT; 835 } 836 837e_free_cert: 838 kfree(cert_blob); 839e_free_pdh: 840 kfree(pdh_blob); 841 return ret; 842} 843 844static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg) 845{ 846 void __user *argp = (void __user *)arg; 847 struct sev_issue_cmd input; 848 int ret = -EFAULT; 849 bool writable = file->f_mode & FMODE_WRITE; 850 851 if (!psp_master || !psp_master->sev_data) 852 return -ENODEV; 853 854 if (ioctl != SEV_ISSUE_CMD) 855 return -EINVAL; 856 857 if (copy_from_user(&input, argp, sizeof(struct sev_issue_cmd))) 858 return -EFAULT; 859 860 if (input.cmd > SEV_MAX) 861 return -EINVAL; 862 863 mutex_lock(&sev_cmd_mutex); 864 865 switch (input.cmd) { 866 867 case SEV_FACTORY_RESET: 868 ret = sev_ioctl_do_reset(&input, writable); 869 break; 870 case SEV_PLATFORM_STATUS: 871 ret = sev_ioctl_do_platform_status(&input); 872 break; 873 case SEV_PEK_GEN: 874 ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PEK_GEN, &input, writable); 875 break; 876 case SEV_PDH_GEN: 877 ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PDH_GEN, &input, writable); 878 break; 879 case SEV_PEK_CSR: 880 ret = sev_ioctl_do_pek_csr(&input, writable); 881 break; 882 case SEV_PEK_CERT_IMPORT: 883 ret = sev_ioctl_do_pek_import(&input, writable); 884 break; 885 case SEV_PDH_CERT_EXPORT: 886 ret = sev_ioctl_do_pdh_export(&input, writable); 887 break; 888 case SEV_GET_ID: 889 pr_warn_once("SEV_GET_ID command is deprecated, use SEV_GET_ID2\n"); 890 ret = sev_ioctl_do_get_id(&input); 891 break; 892 case SEV_GET_ID2: 893 ret = sev_ioctl_do_get_id2(&input); 894 break; 895 default: 896 ret = -EINVAL; 897 goto out; 898 } 899 900 if (copy_to_user(argp, &input, sizeof(struct sev_issue_cmd))) 901 ret = -EFAULT; 902out: 903 mutex_unlock(&sev_cmd_mutex); 904 905 return ret; 906} 907 908static const struct file_operations sev_fops = { 909 .owner = THIS_MODULE, 910 .unlocked_ioctl = sev_ioctl, 911}; 912 913int sev_platform_status(struct sev_user_data_status *data, int *error) 914{ 915 return sev_do_cmd(SEV_CMD_PLATFORM_STATUS, data, error); 916} 917EXPORT_SYMBOL_GPL(sev_platform_status); 918 919int sev_guest_deactivate(struct sev_data_deactivate *data, int *error) 920{ 921 return sev_do_cmd(SEV_CMD_DEACTIVATE, data, error); 922} 923EXPORT_SYMBOL_GPL(sev_guest_deactivate); 924 925int sev_guest_activate(struct sev_data_activate *data, int *error) 926{ 927 return sev_do_cmd(SEV_CMD_ACTIVATE, data, error); 928} 929EXPORT_SYMBOL_GPL(sev_guest_activate); 930 931int sev_guest_decommission(struct sev_data_decommission *data, int *error) 932{ 933 return sev_do_cmd(SEV_CMD_DECOMMISSION, data, error); 934} 935EXPORT_SYMBOL_GPL(sev_guest_decommission); 936 937int sev_guest_df_flush(int *error) 938{ 939 return sev_do_cmd(SEV_CMD_DF_FLUSH, NULL, error); 940} 941EXPORT_SYMBOL_GPL(sev_guest_df_flush); 942 943static void sev_exit(struct kref *ref) 944{ 945 misc_deregister(&misc_dev->misc); 946 kfree(misc_dev); 947 misc_dev = NULL; 948} 949 950static int sev_misc_init(struct sev_device *sev) 951{ 952 struct device *dev = sev->dev; 953 int ret; 954 955 /* 956 * SEV feature support can be detected on multiple devices but the SEV 957 * FW commands must be issued on the master. During probe, we do not 958 * know the master hence we create /dev/sev on the first device probe. 959 * sev_do_cmd() finds the right master device to which to issue the 960 * command to the firmware. 961 */ 962 if (!misc_dev) { 963 struct miscdevice *misc; 964 965 misc_dev = kzalloc(sizeof(*misc_dev), GFP_KERNEL); 966 if (!misc_dev) 967 return -ENOMEM; 968 969 misc = &misc_dev->misc; 970 misc->minor = MISC_DYNAMIC_MINOR; 971 misc->name = DEVICE_NAME; 972 misc->fops = &sev_fops; 973 974 ret = misc_register(misc); 975 if (ret) 976 return ret; 977 978 kref_init(&misc_dev->refcount); 979 } else { 980 kref_get(&misc_dev->refcount); 981 } 982 983 init_waitqueue_head(&sev->int_queue); 984 sev->misc = misc_dev; 985 dev_dbg(dev, "registered SEV device\n"); 986 987 return 0; 988} 989 990int sev_dev_init(struct psp_device *psp) 991{ 992 struct device *dev = psp->dev; 993 struct sev_device *sev; 994 int ret = -ENOMEM; 995 996 sev = devm_kzalloc(dev, sizeof(*sev), GFP_KERNEL); 997 if (!sev) 998 goto e_err; 999 1000 sev->cmd_buf = (void *)devm_get_free_pages(dev, GFP_KERNEL, 0); 1001 if (!sev->cmd_buf) 1002 goto e_sev; 1003 1004 psp->sev_data = sev; 1005 1006 sev->dev = dev; 1007 sev->psp = psp; 1008 1009 sev->io_regs = psp->io_regs; 1010 1011 sev->vdata = (struct sev_vdata *)psp->vdata->sev; 1012 if (!sev->vdata) { 1013 ret = -ENODEV; 1014 dev_err(dev, "sev: missing driver data\n"); 1015 goto e_buf; 1016 } 1017 1018 psp_set_sev_irq_handler(psp, sev_irq_handler, sev); 1019 1020 ret = sev_misc_init(sev); 1021 if (ret) 1022 goto e_irq; 1023 1024 dev_notice(dev, "sev enabled\n"); 1025 1026 return 0; 1027 1028e_irq: 1029 psp_clear_sev_irq_handler(psp); 1030e_buf: 1031 devm_free_pages(dev, (unsigned long)sev->cmd_buf); 1032e_sev: 1033 devm_kfree(dev, sev); 1034e_err: 1035 psp->sev_data = NULL; 1036 1037 dev_notice(dev, "sev initialization failed\n"); 1038 1039 return ret; 1040} 1041 1042static void sev_firmware_shutdown(struct sev_device *sev) 1043{ 1044 sev_platform_shutdown(NULL); 1045 1046 if (sev_es_tmr) { 1047 /* The TMR area was encrypted, flush it from the cache */ 1048 wbinvd_on_all_cpus(); 1049 1050 free_pages((unsigned long)sev_es_tmr, 1051 get_order(SEV_ES_TMR_SIZE)); 1052 sev_es_tmr = NULL; 1053 } 1054} 1055 1056void sev_dev_destroy(struct psp_device *psp) 1057{ 1058 struct sev_device *sev = psp->sev_data; 1059 1060 if (!sev) 1061 return; 1062 1063 sev_firmware_shutdown(sev); 1064 1065 if (sev->misc) 1066 kref_put(&misc_dev->refcount, sev_exit); 1067 1068 psp_clear_sev_irq_handler(psp); 1069} 1070 1071int sev_issue_cmd_external_user(struct file *filep, unsigned int cmd, 1072 void *data, int *error) 1073{ 1074 if (!filep || filep->f_op != &sev_fops) 1075 return -EBADF; 1076 1077 return sev_do_cmd(cmd, data, error); 1078} 1079EXPORT_SYMBOL_GPL(sev_issue_cmd_external_user); 1080 1081void sev_pci_init(void) 1082{ 1083 struct sev_device *sev = psp_master->sev_data; 1084 int error, rc; 1085 1086 if (!sev) 1087 return; 1088 1089 psp_timeout = psp_probe_timeout; 1090 1091 if (sev_get_api_version()) 1092 goto err; 1093 1094 if (sev_version_greater_or_equal(0, 15) && 1095 sev_update_firmware(sev->dev) == 0) 1096 sev_get_api_version(); 1097 1098 /* Obtain the TMR memory area for SEV-ES use */ 1099 sev_es_tmr = sev_fw_alloc(SEV_ES_TMR_SIZE); 1100 if (sev_es_tmr) 1101 /* Must flush the cache before giving it to the firmware */ 1102 clflush_cache_range(sev_es_tmr, SEV_ES_TMR_SIZE); 1103 else 1104 dev_warn(sev->dev, 1105 "SEV: TMR allocation failed, SEV-ES support unavailable\n"); 1106 1107 /* Initialize the platform */ 1108 rc = sev_platform_init(&error); 1109 if (rc && (error == SEV_RET_SECURE_DATA_INVALID)) { 1110 /* 1111 * INIT command returned an integrity check failure 1112 * status code, meaning that firmware load and 1113 * validation of SEV related persistent data has 1114 * failed and persistent state has been erased. 1115 * Retrying INIT command here should succeed. 1116 */ 1117 dev_dbg(sev->dev, "SEV: retrying INIT command"); 1118 rc = sev_platform_init(&error); 1119 } 1120 1121 if (rc) { 1122 dev_err(sev->dev, "SEV: failed to INIT error %#x\n", error); 1123 return; 1124 } 1125 1126 dev_info(sev->dev, "SEV API:%d.%d build:%d\n", sev->api_major, 1127 sev->api_minor, sev->build); 1128 1129 return; 1130 1131err: 1132 psp_master->sev_data = NULL; 1133} 1134 1135void sev_pci_exit(void) 1136{ 1137 struct sev_device *sev = psp_master->sev_data; 1138 1139 if (!sev) 1140 return; 1141 1142 sev_firmware_shutdown(sev); 1143} 1144