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 #include <linux/cpufeature.h> 25 26 #include <asm/smp.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 35 static DEFINE_MUTEX(sev_cmd_mutex); 36 static struct sev_misc_dev *misc_dev; 37 38 static int psp_cmd_timeout = 100; 39 module_param(psp_cmd_timeout, int, 0644); 40 MODULE_PARM_DESC(psp_cmd_timeout, " default timeout value, in seconds, for PSP commands"); 41 42 static int psp_probe_timeout = 5; 43 module_param(psp_probe_timeout, int, 0644); 44 MODULE_PARM_DESC(psp_probe_timeout, " default timeout value, in seconds, during PSP device probe"); 45 46 MODULE_FIRMWARE("amd/amd_sev_fam17h_model0xh.sbin"); /* 1st gen EPYC */ 47 MODULE_FIRMWARE("amd/amd_sev_fam17h_model3xh.sbin"); /* 2nd gen EPYC */ 48 MODULE_FIRMWARE("amd/amd_sev_fam19h_model0xh.sbin"); /* 3rd gen EPYC */ 49 50 static bool psp_dead; 51 static 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) 59 static void *sev_es_tmr; 60 61 static 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 74 static 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 91 static 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 } 105 106 static 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 case SEV_CMD_ATTESTATION_REPORT: return sizeof(struct sev_data_attestation_report); 137 case SEV_CMD_SEND_CANCEL: return sizeof(struct sev_data_send_cancel); 138 default: return 0; 139 } 140 141 return 0; 142 } 143 144 static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret) 145 { 146 struct psp_device *psp = psp_master; 147 struct sev_device *sev; 148 unsigned int phys_lsb, phys_msb; 149 unsigned int reg, ret = 0; 150 int buf_len; 151 152 if (!psp || !psp->sev_data) 153 return -ENODEV; 154 155 if (psp_dead) 156 return -EBUSY; 157 158 sev = psp->sev_data; 159 160 buf_len = sev_cmd_buffer_len(cmd); 161 if (WARN_ON_ONCE(!data != !buf_len)) 162 return -EINVAL; 163 164 /* 165 * Copy the incoming data to driver's scratch buffer as __pa() will not 166 * work for some memory, e.g. vmalloc'd addresses, and @data may not be 167 * physically contiguous. 168 */ 169 if (data) 170 memcpy(sev->cmd_buf, data, buf_len); 171 172 /* Get the physical address of the command buffer */ 173 phys_lsb = data ? lower_32_bits(__psp_pa(sev->cmd_buf)) : 0; 174 phys_msb = data ? upper_32_bits(__psp_pa(sev->cmd_buf)) : 0; 175 176 dev_dbg(sev->dev, "sev command id %#x buffer 0x%08x%08x timeout %us\n", 177 cmd, phys_msb, phys_lsb, psp_timeout); 178 179 print_hex_dump_debug("(in): ", DUMP_PREFIX_OFFSET, 16, 2, data, 180 buf_len, false); 181 182 iowrite32(phys_lsb, sev->io_regs + sev->vdata->cmdbuff_addr_lo_reg); 183 iowrite32(phys_msb, sev->io_regs + sev->vdata->cmdbuff_addr_hi_reg); 184 185 sev->int_rcvd = 0; 186 187 reg = cmd; 188 reg <<= SEV_CMDRESP_CMD_SHIFT; 189 reg |= SEV_CMDRESP_IOC; 190 iowrite32(reg, sev->io_regs + sev->vdata->cmdresp_reg); 191 192 /* wait for command completion */ 193 ret = sev_wait_cmd_ioc(sev, ®, psp_timeout); 194 if (ret) { 195 if (psp_ret) 196 *psp_ret = 0; 197 198 dev_err(sev->dev, "sev command %#x timed out, disabling PSP\n", cmd); 199 psp_dead = true; 200 201 return ret; 202 } 203 204 psp_timeout = psp_cmd_timeout; 205 206 if (psp_ret) 207 *psp_ret = reg & PSP_CMDRESP_ERR_MASK; 208 209 if (reg & PSP_CMDRESP_ERR_MASK) { 210 dev_dbg(sev->dev, "sev command %#x failed (%#010x)\n", 211 cmd, reg & PSP_CMDRESP_ERR_MASK); 212 ret = -EIO; 213 } 214 215 print_hex_dump_debug("(out): ", DUMP_PREFIX_OFFSET, 16, 2, data, 216 buf_len, false); 217 218 /* 219 * Copy potential output from the PSP back to data. Do this even on 220 * failure in case the caller wants to glean something from the error. 221 */ 222 if (data) 223 memcpy(data, sev->cmd_buf, buf_len); 224 225 return ret; 226 } 227 228 static int sev_do_cmd(int cmd, void *data, int *psp_ret) 229 { 230 int rc; 231 232 mutex_lock(&sev_cmd_mutex); 233 rc = __sev_do_cmd_locked(cmd, data, psp_ret); 234 mutex_unlock(&sev_cmd_mutex); 235 236 return rc; 237 } 238 239 static int __sev_platform_init_locked(int *error) 240 { 241 struct psp_device *psp = psp_master; 242 struct sev_data_init data; 243 struct sev_device *sev; 244 int rc = 0; 245 246 if (!psp || !psp->sev_data) 247 return -ENODEV; 248 249 sev = psp->sev_data; 250 251 if (sev->state == SEV_STATE_INIT) 252 return 0; 253 254 memset(&data, 0, sizeof(data)); 255 if (sev_es_tmr) { 256 u64 tmr_pa; 257 258 /* 259 * Do not include the encryption mask on the physical 260 * address of the TMR (firmware should clear it anyway). 261 */ 262 tmr_pa = __pa(sev_es_tmr); 263 264 data.flags |= SEV_INIT_FLAGS_SEV_ES; 265 data.tmr_address = tmr_pa; 266 data.tmr_len = SEV_ES_TMR_SIZE; 267 } 268 269 rc = __sev_do_cmd_locked(SEV_CMD_INIT, &data, error); 270 if (rc) 271 return rc; 272 273 sev->state = SEV_STATE_INIT; 274 275 /* Prepare for first SEV guest launch after INIT */ 276 wbinvd_on_all_cpus(); 277 rc = __sev_do_cmd_locked(SEV_CMD_DF_FLUSH, NULL, error); 278 if (rc) 279 return rc; 280 281 dev_dbg(sev->dev, "SEV firmware initialized\n"); 282 283 return rc; 284 } 285 286 int sev_platform_init(int *error) 287 { 288 int rc; 289 290 mutex_lock(&sev_cmd_mutex); 291 rc = __sev_platform_init_locked(error); 292 mutex_unlock(&sev_cmd_mutex); 293 294 return rc; 295 } 296 EXPORT_SYMBOL_GPL(sev_platform_init); 297 298 static int __sev_platform_shutdown_locked(int *error) 299 { 300 struct sev_device *sev = psp_master->sev_data; 301 int ret; 302 303 ret = __sev_do_cmd_locked(SEV_CMD_SHUTDOWN, NULL, error); 304 if (ret) 305 return ret; 306 307 sev->state = SEV_STATE_UNINIT; 308 dev_dbg(sev->dev, "SEV firmware shutdown\n"); 309 310 return ret; 311 } 312 313 static int sev_platform_shutdown(int *error) 314 { 315 int rc; 316 317 mutex_lock(&sev_cmd_mutex); 318 rc = __sev_platform_shutdown_locked(NULL); 319 mutex_unlock(&sev_cmd_mutex); 320 321 return rc; 322 } 323 324 static int sev_get_platform_state(int *state, int *error) 325 { 326 struct sev_user_data_status data; 327 int rc; 328 329 rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, &data, error); 330 if (rc) 331 return rc; 332 333 *state = data.state; 334 return rc; 335 } 336 337 static int sev_ioctl_do_reset(struct sev_issue_cmd *argp, bool writable) 338 { 339 int state, rc; 340 341 if (!writable) 342 return -EPERM; 343 344 /* 345 * The SEV spec requires that FACTORY_RESET must be issued in 346 * UNINIT state. Before we go further lets check if any guest is 347 * active. 348 * 349 * If FW is in WORKING state then deny the request otherwise issue 350 * SHUTDOWN command do INIT -> UNINIT before issuing the FACTORY_RESET. 351 * 352 */ 353 rc = sev_get_platform_state(&state, &argp->error); 354 if (rc) 355 return rc; 356 357 if (state == SEV_STATE_WORKING) 358 return -EBUSY; 359 360 if (state == SEV_STATE_INIT) { 361 rc = __sev_platform_shutdown_locked(&argp->error); 362 if (rc) 363 return rc; 364 } 365 366 return __sev_do_cmd_locked(SEV_CMD_FACTORY_RESET, NULL, &argp->error); 367 } 368 369 static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp) 370 { 371 struct sev_user_data_status data; 372 int ret; 373 374 ret = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, &data, &argp->error); 375 if (ret) 376 return ret; 377 378 if (copy_to_user((void __user *)argp->data, &data, sizeof(data))) 379 ret = -EFAULT; 380 381 return ret; 382 } 383 384 static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp, bool writable) 385 { 386 struct sev_device *sev = psp_master->sev_data; 387 int rc; 388 389 if (!writable) 390 return -EPERM; 391 392 if (sev->state == SEV_STATE_UNINIT) { 393 rc = __sev_platform_init_locked(&argp->error); 394 if (rc) 395 return rc; 396 } 397 398 return __sev_do_cmd_locked(cmd, NULL, &argp->error); 399 } 400 401 static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp, bool writable) 402 { 403 struct sev_device *sev = psp_master->sev_data; 404 struct sev_user_data_pek_csr input; 405 struct sev_data_pek_csr data; 406 void __user *input_address; 407 void *blob = NULL; 408 int ret; 409 410 if (!writable) 411 return -EPERM; 412 413 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input))) 414 return -EFAULT; 415 416 memset(&data, 0, sizeof(data)); 417 418 /* userspace wants to query CSR length */ 419 if (!input.address || !input.length) 420 goto cmd; 421 422 /* allocate a physically contiguous buffer to store the CSR blob */ 423 input_address = (void __user *)input.address; 424 if (input.length > SEV_FW_BLOB_MAX_SIZE) 425 return -EFAULT; 426 427 blob = kmalloc(input.length, GFP_KERNEL); 428 if (!blob) 429 return -ENOMEM; 430 431 data.address = __psp_pa(blob); 432 data.len = input.length; 433 434 cmd: 435 if (sev->state == SEV_STATE_UNINIT) { 436 ret = __sev_platform_init_locked(&argp->error); 437 if (ret) 438 goto e_free_blob; 439 } 440 441 ret = __sev_do_cmd_locked(SEV_CMD_PEK_CSR, &data, &argp->error); 442 443 /* If we query the CSR length, FW responded with expected data. */ 444 input.length = data.len; 445 446 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) { 447 ret = -EFAULT; 448 goto e_free_blob; 449 } 450 451 if (blob) { 452 if (copy_to_user(input_address, blob, input.length)) 453 ret = -EFAULT; 454 } 455 456 e_free_blob: 457 kfree(blob); 458 return ret; 459 } 460 461 void *psp_copy_user_blob(u64 uaddr, u32 len) 462 { 463 if (!uaddr || !len) 464 return ERR_PTR(-EINVAL); 465 466 /* verify that blob length does not exceed our limit */ 467 if (len > SEV_FW_BLOB_MAX_SIZE) 468 return ERR_PTR(-EINVAL); 469 470 return memdup_user((void __user *)uaddr, len); 471 } 472 EXPORT_SYMBOL_GPL(psp_copy_user_blob); 473 474 static int sev_get_api_version(void) 475 { 476 struct sev_device *sev = psp_master->sev_data; 477 struct sev_user_data_status status; 478 int error = 0, ret; 479 480 ret = sev_platform_status(&status, &error); 481 if (ret) { 482 dev_err(sev->dev, 483 "SEV: failed to get status. Error: %#x\n", error); 484 return 1; 485 } 486 487 sev->api_major = status.api_major; 488 sev->api_minor = status.api_minor; 489 sev->build = status.build; 490 sev->state = status.state; 491 492 return 0; 493 } 494 495 static int sev_get_firmware(struct device *dev, 496 const struct firmware **firmware) 497 { 498 char fw_name_specific[SEV_FW_NAME_SIZE]; 499 char fw_name_subset[SEV_FW_NAME_SIZE]; 500 501 snprintf(fw_name_specific, sizeof(fw_name_specific), 502 "amd/amd_sev_fam%.2xh_model%.2xh.sbin", 503 boot_cpu_data.x86, boot_cpu_data.x86_model); 504 505 snprintf(fw_name_subset, sizeof(fw_name_subset), 506 "amd/amd_sev_fam%.2xh_model%.1xxh.sbin", 507 boot_cpu_data.x86, (boot_cpu_data.x86_model & 0xf0) >> 4); 508 509 /* Check for SEV FW for a particular model. 510 * Ex. amd_sev_fam17h_model00h.sbin for Family 17h Model 00h 511 * 512 * or 513 * 514 * Check for SEV FW common to a subset of models. 515 * Ex. amd_sev_fam17h_model0xh.sbin for 516 * Family 17h Model 00h -- Family 17h Model 0Fh 517 * 518 * or 519 * 520 * Fall-back to using generic name: sev.fw 521 */ 522 if ((firmware_request_nowarn(firmware, fw_name_specific, dev) >= 0) || 523 (firmware_request_nowarn(firmware, fw_name_subset, dev) >= 0) || 524 (firmware_request_nowarn(firmware, SEV_FW_FILE, dev) >= 0)) 525 return 0; 526 527 return -ENOENT; 528 } 529 530 /* Don't fail if SEV FW couldn't be updated. Continue with existing SEV FW */ 531 static int sev_update_firmware(struct device *dev) 532 { 533 struct sev_data_download_firmware *data; 534 const struct firmware *firmware; 535 int ret, error, order; 536 struct page *p; 537 u64 data_size; 538 539 if (sev_get_firmware(dev, &firmware) == -ENOENT) { 540 dev_dbg(dev, "No SEV firmware file present\n"); 541 return -1; 542 } 543 544 /* 545 * SEV FW expects the physical address given to it to be 32 546 * byte aligned. Memory allocated has structure placed at the 547 * beginning followed by the firmware being passed to the SEV 548 * FW. Allocate enough memory for data structure + alignment 549 * padding + SEV FW. 550 */ 551 data_size = ALIGN(sizeof(struct sev_data_download_firmware), 32); 552 553 order = get_order(firmware->size + data_size); 554 p = alloc_pages(GFP_KERNEL, order); 555 if (!p) { 556 ret = -1; 557 goto fw_err; 558 } 559 560 /* 561 * Copy firmware data to a kernel allocated contiguous 562 * memory region. 563 */ 564 data = page_address(p); 565 memcpy(page_address(p) + data_size, firmware->data, firmware->size); 566 567 data->address = __psp_pa(page_address(p) + data_size); 568 data->len = firmware->size; 569 570 ret = sev_do_cmd(SEV_CMD_DOWNLOAD_FIRMWARE, data, &error); 571 if (ret) 572 dev_dbg(dev, "Failed to update SEV firmware: %#x\n", error); 573 else 574 dev_info(dev, "SEV firmware update successful\n"); 575 576 __free_pages(p, order); 577 578 fw_err: 579 release_firmware(firmware); 580 581 return ret; 582 } 583 584 static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp, bool writable) 585 { 586 struct sev_device *sev = psp_master->sev_data; 587 struct sev_user_data_pek_cert_import input; 588 struct sev_data_pek_cert_import data; 589 void *pek_blob, *oca_blob; 590 int ret; 591 592 if (!writable) 593 return -EPERM; 594 595 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input))) 596 return -EFAULT; 597 598 /* copy PEK certificate blobs from userspace */ 599 pek_blob = psp_copy_user_blob(input.pek_cert_address, input.pek_cert_len); 600 if (IS_ERR(pek_blob)) 601 return PTR_ERR(pek_blob); 602 603 data.reserved = 0; 604 data.pek_cert_address = __psp_pa(pek_blob); 605 data.pek_cert_len = input.pek_cert_len; 606 607 /* copy PEK certificate blobs from userspace */ 608 oca_blob = psp_copy_user_blob(input.oca_cert_address, input.oca_cert_len); 609 if (IS_ERR(oca_blob)) { 610 ret = PTR_ERR(oca_blob); 611 goto e_free_pek; 612 } 613 614 data.oca_cert_address = __psp_pa(oca_blob); 615 data.oca_cert_len = input.oca_cert_len; 616 617 /* If platform is not in INIT state then transition it to INIT */ 618 if (sev->state != SEV_STATE_INIT) { 619 ret = __sev_platform_init_locked(&argp->error); 620 if (ret) 621 goto e_free_oca; 622 } 623 624 ret = __sev_do_cmd_locked(SEV_CMD_PEK_CERT_IMPORT, &data, &argp->error); 625 626 e_free_oca: 627 kfree(oca_blob); 628 e_free_pek: 629 kfree(pek_blob); 630 return ret; 631 } 632 633 static int sev_ioctl_do_get_id2(struct sev_issue_cmd *argp) 634 { 635 struct sev_user_data_get_id2 input; 636 struct sev_data_get_id data; 637 void __user *input_address; 638 void *id_blob = NULL; 639 int ret; 640 641 /* SEV GET_ID is available from SEV API v0.16 and up */ 642 if (!sev_version_greater_or_equal(0, 16)) 643 return -ENOTSUPP; 644 645 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input))) 646 return -EFAULT; 647 648 input_address = (void __user *)input.address; 649 650 if (input.address && input.length) { 651 id_blob = kmalloc(input.length, GFP_KERNEL); 652 if (!id_blob) 653 return -ENOMEM; 654 655 data.address = __psp_pa(id_blob); 656 data.len = input.length; 657 } else { 658 data.address = 0; 659 data.len = 0; 660 } 661 662 ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, &data, &argp->error); 663 664 /* 665 * Firmware will return the length of the ID value (either the minimum 666 * required length or the actual length written), return it to the user. 667 */ 668 input.length = data.len; 669 670 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) { 671 ret = -EFAULT; 672 goto e_free; 673 } 674 675 if (id_blob) { 676 if (copy_to_user(input_address, id_blob, data.len)) { 677 ret = -EFAULT; 678 goto e_free; 679 } 680 } 681 682 e_free: 683 kfree(id_blob); 684 685 return ret; 686 } 687 688 static int sev_ioctl_do_get_id(struct sev_issue_cmd *argp) 689 { 690 struct sev_data_get_id *data; 691 u64 data_size, user_size; 692 void *id_blob, *mem; 693 int ret; 694 695 /* SEV GET_ID available from SEV API v0.16 and up */ 696 if (!sev_version_greater_or_equal(0, 16)) 697 return -ENOTSUPP; 698 699 /* SEV FW expects the buffer it fills with the ID to be 700 * 8-byte aligned. Memory allocated should be enough to 701 * hold data structure + alignment padding + memory 702 * where SEV FW writes the ID. 703 */ 704 data_size = ALIGN(sizeof(struct sev_data_get_id), 8); 705 user_size = sizeof(struct sev_user_data_get_id); 706 707 mem = kzalloc(data_size + user_size, GFP_KERNEL); 708 if (!mem) 709 return -ENOMEM; 710 711 data = mem; 712 id_blob = mem + data_size; 713 714 data->address = __psp_pa(id_blob); 715 data->len = user_size; 716 717 ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error); 718 if (!ret) { 719 if (copy_to_user((void __user *)argp->data, id_blob, data->len)) 720 ret = -EFAULT; 721 } 722 723 kfree(mem); 724 725 return ret; 726 } 727 728 static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp, bool writable) 729 { 730 struct sev_device *sev = psp_master->sev_data; 731 struct sev_user_data_pdh_cert_export input; 732 void *pdh_blob = NULL, *cert_blob = NULL; 733 struct sev_data_pdh_cert_export data; 734 void __user *input_cert_chain_address; 735 void __user *input_pdh_cert_address; 736 int ret; 737 738 /* If platform is not in INIT state then transition it to INIT. */ 739 if (sev->state != SEV_STATE_INIT) { 740 if (!writable) 741 return -EPERM; 742 743 ret = __sev_platform_init_locked(&argp->error); 744 if (ret) 745 return ret; 746 } 747 748 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input))) 749 return -EFAULT; 750 751 memset(&data, 0, sizeof(data)); 752 753 /* Userspace wants to query the certificate length. */ 754 if (!input.pdh_cert_address || 755 !input.pdh_cert_len || 756 !input.cert_chain_address) 757 goto cmd; 758 759 input_pdh_cert_address = (void __user *)input.pdh_cert_address; 760 input_cert_chain_address = (void __user *)input.cert_chain_address; 761 762 /* Allocate a physically contiguous buffer to store the PDH blob. */ 763 if (input.pdh_cert_len > SEV_FW_BLOB_MAX_SIZE) 764 return -EFAULT; 765 766 /* Allocate a physically contiguous buffer to store the cert chain blob. */ 767 if (input.cert_chain_len > SEV_FW_BLOB_MAX_SIZE) 768 return -EFAULT; 769 770 pdh_blob = kmalloc(input.pdh_cert_len, GFP_KERNEL); 771 if (!pdh_blob) 772 return -ENOMEM; 773 774 data.pdh_cert_address = __psp_pa(pdh_blob); 775 data.pdh_cert_len = input.pdh_cert_len; 776 777 cert_blob = kmalloc(input.cert_chain_len, GFP_KERNEL); 778 if (!cert_blob) { 779 ret = -ENOMEM; 780 goto e_free_pdh; 781 } 782 783 data.cert_chain_address = __psp_pa(cert_blob); 784 data.cert_chain_len = input.cert_chain_len; 785 786 cmd: 787 ret = __sev_do_cmd_locked(SEV_CMD_PDH_CERT_EXPORT, &data, &argp->error); 788 789 /* If we query the length, FW responded with expected data. */ 790 input.cert_chain_len = data.cert_chain_len; 791 input.pdh_cert_len = data.pdh_cert_len; 792 793 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) { 794 ret = -EFAULT; 795 goto e_free_cert; 796 } 797 798 if (pdh_blob) { 799 if (copy_to_user(input_pdh_cert_address, 800 pdh_blob, input.pdh_cert_len)) { 801 ret = -EFAULT; 802 goto e_free_cert; 803 } 804 } 805 806 if (cert_blob) { 807 if (copy_to_user(input_cert_chain_address, 808 cert_blob, input.cert_chain_len)) 809 ret = -EFAULT; 810 } 811 812 e_free_cert: 813 kfree(cert_blob); 814 e_free_pdh: 815 kfree(pdh_blob); 816 return ret; 817 } 818 819 static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg) 820 { 821 void __user *argp = (void __user *)arg; 822 struct sev_issue_cmd input; 823 int ret = -EFAULT; 824 bool writable = file->f_mode & FMODE_WRITE; 825 826 if (!psp_master || !psp_master->sev_data) 827 return -ENODEV; 828 829 if (ioctl != SEV_ISSUE_CMD) 830 return -EINVAL; 831 832 if (copy_from_user(&input, argp, sizeof(struct sev_issue_cmd))) 833 return -EFAULT; 834 835 if (input.cmd > SEV_MAX) 836 return -EINVAL; 837 838 mutex_lock(&sev_cmd_mutex); 839 840 switch (input.cmd) { 841 842 case SEV_FACTORY_RESET: 843 ret = sev_ioctl_do_reset(&input, writable); 844 break; 845 case SEV_PLATFORM_STATUS: 846 ret = sev_ioctl_do_platform_status(&input); 847 break; 848 case SEV_PEK_GEN: 849 ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PEK_GEN, &input, writable); 850 break; 851 case SEV_PDH_GEN: 852 ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PDH_GEN, &input, writable); 853 break; 854 case SEV_PEK_CSR: 855 ret = sev_ioctl_do_pek_csr(&input, writable); 856 break; 857 case SEV_PEK_CERT_IMPORT: 858 ret = sev_ioctl_do_pek_import(&input, writable); 859 break; 860 case SEV_PDH_CERT_EXPORT: 861 ret = sev_ioctl_do_pdh_export(&input, writable); 862 break; 863 case SEV_GET_ID: 864 pr_warn_once("SEV_GET_ID command is deprecated, use SEV_GET_ID2\n"); 865 ret = sev_ioctl_do_get_id(&input); 866 break; 867 case SEV_GET_ID2: 868 ret = sev_ioctl_do_get_id2(&input); 869 break; 870 default: 871 ret = -EINVAL; 872 goto out; 873 } 874 875 if (copy_to_user(argp, &input, sizeof(struct sev_issue_cmd))) 876 ret = -EFAULT; 877 out: 878 mutex_unlock(&sev_cmd_mutex); 879 880 return ret; 881 } 882 883 static const struct file_operations sev_fops = { 884 .owner = THIS_MODULE, 885 .unlocked_ioctl = sev_ioctl, 886 }; 887 888 int sev_platform_status(struct sev_user_data_status *data, int *error) 889 { 890 return sev_do_cmd(SEV_CMD_PLATFORM_STATUS, data, error); 891 } 892 EXPORT_SYMBOL_GPL(sev_platform_status); 893 894 int sev_guest_deactivate(struct sev_data_deactivate *data, int *error) 895 { 896 return sev_do_cmd(SEV_CMD_DEACTIVATE, data, error); 897 } 898 EXPORT_SYMBOL_GPL(sev_guest_deactivate); 899 900 int sev_guest_activate(struct sev_data_activate *data, int *error) 901 { 902 return sev_do_cmd(SEV_CMD_ACTIVATE, data, error); 903 } 904 EXPORT_SYMBOL_GPL(sev_guest_activate); 905 906 int sev_guest_decommission(struct sev_data_decommission *data, int *error) 907 { 908 return sev_do_cmd(SEV_CMD_DECOMMISSION, data, error); 909 } 910 EXPORT_SYMBOL_GPL(sev_guest_decommission); 911 912 int sev_guest_df_flush(int *error) 913 { 914 return sev_do_cmd(SEV_CMD_DF_FLUSH, NULL, error); 915 } 916 EXPORT_SYMBOL_GPL(sev_guest_df_flush); 917 918 static void sev_exit(struct kref *ref) 919 { 920 misc_deregister(&misc_dev->misc); 921 kfree(misc_dev); 922 misc_dev = NULL; 923 } 924 925 static int sev_misc_init(struct sev_device *sev) 926 { 927 struct device *dev = sev->dev; 928 int ret; 929 930 /* 931 * SEV feature support can be detected on multiple devices but the SEV 932 * FW commands must be issued on the master. During probe, we do not 933 * know the master hence we create /dev/sev on the first device probe. 934 * sev_do_cmd() finds the right master device to which to issue the 935 * command to the firmware. 936 */ 937 if (!misc_dev) { 938 struct miscdevice *misc; 939 940 misc_dev = kzalloc(sizeof(*misc_dev), GFP_KERNEL); 941 if (!misc_dev) 942 return -ENOMEM; 943 944 misc = &misc_dev->misc; 945 misc->minor = MISC_DYNAMIC_MINOR; 946 misc->name = DEVICE_NAME; 947 misc->fops = &sev_fops; 948 949 ret = misc_register(misc); 950 if (ret) 951 return ret; 952 953 kref_init(&misc_dev->refcount); 954 } else { 955 kref_get(&misc_dev->refcount); 956 } 957 958 init_waitqueue_head(&sev->int_queue); 959 sev->misc = misc_dev; 960 dev_dbg(dev, "registered SEV device\n"); 961 962 return 0; 963 } 964 965 int sev_dev_init(struct psp_device *psp) 966 { 967 struct device *dev = psp->dev; 968 struct sev_device *sev; 969 int ret = -ENOMEM; 970 971 if (!boot_cpu_has(X86_FEATURE_SEV)) { 972 dev_info_once(dev, "SEV: memory encryption not enabled by BIOS\n"); 973 return 0; 974 } 975 976 sev = devm_kzalloc(dev, sizeof(*sev), GFP_KERNEL); 977 if (!sev) 978 goto e_err; 979 980 sev->cmd_buf = (void *)devm_get_free_pages(dev, GFP_KERNEL, 0); 981 if (!sev->cmd_buf) 982 goto e_sev; 983 984 psp->sev_data = sev; 985 986 sev->dev = dev; 987 sev->psp = psp; 988 989 sev->io_regs = psp->io_regs; 990 991 sev->vdata = (struct sev_vdata *)psp->vdata->sev; 992 if (!sev->vdata) { 993 ret = -ENODEV; 994 dev_err(dev, "sev: missing driver data\n"); 995 goto e_buf; 996 } 997 998 psp_set_sev_irq_handler(psp, sev_irq_handler, sev); 999 1000 ret = sev_misc_init(sev); 1001 if (ret) 1002 goto e_irq; 1003 1004 dev_notice(dev, "sev enabled\n"); 1005 1006 return 0; 1007 1008 e_irq: 1009 psp_clear_sev_irq_handler(psp); 1010 e_buf: 1011 devm_free_pages(dev, (unsigned long)sev->cmd_buf); 1012 e_sev: 1013 devm_kfree(dev, sev); 1014 e_err: 1015 psp->sev_data = NULL; 1016 1017 dev_notice(dev, "sev initialization failed\n"); 1018 1019 return ret; 1020 } 1021 1022 void sev_dev_destroy(struct psp_device *psp) 1023 { 1024 struct sev_device *sev = psp->sev_data; 1025 1026 if (!sev) 1027 return; 1028 1029 if (sev->misc) 1030 kref_put(&misc_dev->refcount, sev_exit); 1031 1032 psp_clear_sev_irq_handler(psp); 1033 } 1034 1035 int sev_issue_cmd_external_user(struct file *filep, unsigned int cmd, 1036 void *data, int *error) 1037 { 1038 if (!filep || filep->f_op != &sev_fops) 1039 return -EBADF; 1040 1041 return sev_do_cmd(cmd, data, error); 1042 } 1043 EXPORT_SYMBOL_GPL(sev_issue_cmd_external_user); 1044 1045 void sev_pci_init(void) 1046 { 1047 struct sev_device *sev = psp_master->sev_data; 1048 struct page *tmr_page; 1049 int error, rc; 1050 1051 if (!sev) 1052 return; 1053 1054 psp_timeout = psp_probe_timeout; 1055 1056 if (sev_get_api_version()) 1057 goto err; 1058 1059 /* 1060 * If platform is not in UNINIT state then firmware upgrade and/or 1061 * platform INIT command will fail. These command require UNINIT state. 1062 * 1063 * In a normal boot we should never run into case where the firmware 1064 * is not in UNINIT state on boot. But in case of kexec boot, a reboot 1065 * may not go through a typical shutdown sequence and may leave the 1066 * firmware in INIT or WORKING state. 1067 */ 1068 1069 if (sev->state != SEV_STATE_UNINIT) { 1070 sev_platform_shutdown(NULL); 1071 sev->state = SEV_STATE_UNINIT; 1072 } 1073 1074 if (sev_version_greater_or_equal(0, 15) && 1075 sev_update_firmware(sev->dev) == 0) 1076 sev_get_api_version(); 1077 1078 /* Obtain the TMR memory area for SEV-ES use */ 1079 tmr_page = alloc_pages(GFP_KERNEL, get_order(SEV_ES_TMR_SIZE)); 1080 if (tmr_page) { 1081 sev_es_tmr = page_address(tmr_page); 1082 } else { 1083 sev_es_tmr = NULL; 1084 dev_warn(sev->dev, 1085 "SEV: TMR allocation failed, SEV-ES support unavailable\n"); 1086 } 1087 1088 /* Initialize the platform */ 1089 rc = sev_platform_init(&error); 1090 if (rc && (error == SEV_RET_SECURE_DATA_INVALID)) { 1091 /* 1092 * INIT command returned an integrity check failure 1093 * status code, meaning that firmware load and 1094 * validation of SEV related persistent data has 1095 * failed and persistent state has been erased. 1096 * Retrying INIT command here should succeed. 1097 */ 1098 dev_dbg(sev->dev, "SEV: retrying INIT command"); 1099 rc = sev_platform_init(&error); 1100 } 1101 1102 if (rc) { 1103 dev_err(sev->dev, "SEV: failed to INIT error %#x\n", error); 1104 return; 1105 } 1106 1107 dev_info(sev->dev, "SEV API:%d.%d build:%d\n", sev->api_major, 1108 sev->api_minor, sev->build); 1109 1110 return; 1111 1112 err: 1113 psp_master->sev_data = NULL; 1114 } 1115 1116 void sev_pci_exit(void) 1117 { 1118 if (!psp_master->sev_data) 1119 return; 1120 1121 sev_platform_shutdown(NULL); 1122 1123 if (sev_es_tmr) { 1124 /* The TMR area was encrypted, flush it from the cache */ 1125 wbinvd_on_all_cpus(); 1126 1127 free_pages((unsigned long)sev_es_tmr, 1128 get_order(SEV_ES_TMR_SIZE)); 1129 sev_es_tmr = NULL; 1130 } 1131 } 1132