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