drivers/crypto/ccp/psp-dev.c

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This source file includes following definitions.
sev_version_greater_or_equal
psp_alloc_struct
psp_irq_handler
sev_wait_cmd_ioc
sev_cmd_buffer_len
__sev_do_cmd_locked
sev_do_cmd
__sev_platform_init_locked
sev_platform_init
__sev_platform_shutdown_locked
sev_platform_shutdown
sev_get_platform_state
sev_ioctl_do_reset
sev_ioctl_do_platform_status
sev_ioctl_do_pek_pdh_gen
sev_ioctl_do_pek_csr
psp_copy_user_blob
sev_get_api_version
sev_get_firmware
sev_update_firmware
sev_ioctl_do_pek_import
sev_ioctl_do_get_id2
sev_ioctl_do_get_id
sev_ioctl_do_pdh_export
sev_ioctl
sev_platform_status
sev_guest_deactivate
sev_guest_activate
sev_guest_decommission
sev_guest_df_flush
sev_exit
sev_misc_init
psp_check_sev_support
psp_dev_init
psp_dev_destroy
sev_issue_cmd_external_user
psp_pci_init
psp_pci_exit
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * AMD Platform Security Processor (PSP) interface
   4  *
   5  * Copyright (C) 2016,2018 Advanced Micro Devices, Inc.
   6  *
   7  * Author: Brijesh Singh <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 
  24 #include "sp-dev.h"
  25 #include "psp-dev.h"
  26 
  27 #define DEVICE_NAME             "sev"
  28 #define SEV_FW_FILE             "amd/sev.fw"
  29 #define SEV_FW_NAME_SIZE        64
  30 
  31 static DEFINE_MUTEX(sev_cmd_mutex);
  32 static struct sev_misc_dev *misc_dev;
  33 static struct psp_device *psp_master;
  34 
  35 static int psp_cmd_timeout = 100;
  36 module_param(psp_cmd_timeout, int, 0644);
  37 MODULE_PARM_DESC(psp_cmd_timeout, " default timeout value, in seconds, for PSP commands");
  38 
  39 static int psp_probe_timeout = 5;
  40 module_param(psp_probe_timeout, int, 0644);
  41 MODULE_PARM_DESC(psp_probe_timeout, " default timeout value, in seconds, during PSP device probe");
  42 
  43 static bool psp_dead;
  44 static int psp_timeout;
  45 
  46 static inline bool sev_version_greater_or_equal(u8 maj, u8 min)
  47 {
  48         if (psp_master->api_major > maj)
  49                 return true;
  50         if (psp_master->api_major == maj && psp_master->api_minor >= min)
  51                 return true;
  52         return false;
  53 }
  54 
  55 static struct psp_device *psp_alloc_struct(struct sp_device *sp)
  56 {
  57         struct device *dev = sp->dev;
  58         struct psp_device *psp;
  59 
  60         psp = devm_kzalloc(dev, sizeof(*psp), GFP_KERNEL);
  61         if (!psp)
  62                 return NULL;
  63 
  64         psp->dev = dev;
  65         psp->sp = sp;
  66 
  67         snprintf(psp->name, sizeof(psp->name), "psp-%u", sp->ord);
  68 
  69         return psp;
  70 }
  71 
  72 static irqreturn_t psp_irq_handler(int irq, void *data)
  73 {
  74         struct psp_device *psp = data;
  75         unsigned int status;
  76         int reg;
  77 
  78         /* Read the interrupt status: */
  79         status = ioread32(psp->io_regs + psp->vdata->intsts_reg);
  80 
  81         /* Check if it is command completion: */
  82         if (!(status & PSP_CMD_COMPLETE))
  83                 goto done;
  84 
  85         /* Check if it is SEV command completion: */
  86         reg = ioread32(psp->io_regs + psp->vdata->cmdresp_reg);
  87         if (reg & PSP_CMDRESP_RESP) {
  88                 psp->sev_int_rcvd = 1;
  89                 wake_up(&psp->sev_int_queue);
  90         }
  91 
  92 done:
  93         /* Clear the interrupt status by writing the same value we read. */
  94         iowrite32(status, psp->io_regs + psp->vdata->intsts_reg);
  95 
  96         return IRQ_HANDLED;
  97 }
  98 
  99 static int sev_wait_cmd_ioc(struct psp_device *psp,
 100                             unsigned int *reg, unsigned int timeout)
 101 {
 102         int ret;
 103 
 104         ret = wait_event_timeout(psp->sev_int_queue,
 105                         psp->sev_int_rcvd, timeout * HZ);
 106         if (!ret)
 107                 return -ETIMEDOUT;
 108 
 109         *reg = ioread32(psp->io_regs + psp->vdata->cmdresp_reg);
 110 
 111         return 0;
 112 }
 113 
 114 static int sev_cmd_buffer_len(int cmd)
 115 {
 116         switch (cmd) {
 117         case SEV_CMD_INIT:                      return sizeof(struct sev_data_init);
 118         case SEV_CMD_PLATFORM_STATUS:           return sizeof(struct sev_user_data_status);
 119         case SEV_CMD_PEK_CSR:                   return sizeof(struct sev_data_pek_csr);
 120         case SEV_CMD_PEK_CERT_IMPORT:           return sizeof(struct sev_data_pek_cert_import);
 121         case SEV_CMD_PDH_CERT_EXPORT:           return sizeof(struct sev_data_pdh_cert_export);
 122         case SEV_CMD_LAUNCH_START:              return sizeof(struct sev_data_launch_start);
 123         case SEV_CMD_LAUNCH_UPDATE_DATA:        return sizeof(struct sev_data_launch_update_data);
 124         case SEV_CMD_LAUNCH_UPDATE_VMSA:        return sizeof(struct sev_data_launch_update_vmsa);
 125         case SEV_CMD_LAUNCH_FINISH:             return sizeof(struct sev_data_launch_finish);
 126         case SEV_CMD_LAUNCH_MEASURE:            return sizeof(struct sev_data_launch_measure);
 127         case SEV_CMD_ACTIVATE:                  return sizeof(struct sev_data_activate);
 128         case SEV_CMD_DEACTIVATE:                return sizeof(struct sev_data_deactivate);
 129         case SEV_CMD_DECOMMISSION:              return sizeof(struct sev_data_decommission);
 130         case SEV_CMD_GUEST_STATUS:              return sizeof(struct sev_data_guest_status);
 131         case SEV_CMD_DBG_DECRYPT:               return sizeof(struct sev_data_dbg);
 132         case SEV_CMD_DBG_ENCRYPT:               return sizeof(struct sev_data_dbg);
 133         case SEV_CMD_SEND_START:                return sizeof(struct sev_data_send_start);
 134         case SEV_CMD_SEND_UPDATE_DATA:          return sizeof(struct sev_data_send_update_data);
 135         case SEV_CMD_SEND_UPDATE_VMSA:          return sizeof(struct sev_data_send_update_vmsa);
 136         case SEV_CMD_SEND_FINISH:               return sizeof(struct sev_data_send_finish);
 137         case SEV_CMD_RECEIVE_START:             return sizeof(struct sev_data_receive_start);
 138         case SEV_CMD_RECEIVE_FINISH:            return sizeof(struct sev_data_receive_finish);
 139         case SEV_CMD_RECEIVE_UPDATE_DATA:       return sizeof(struct sev_data_receive_update_data);
 140         case SEV_CMD_RECEIVE_UPDATE_VMSA:       return sizeof(struct sev_data_receive_update_vmsa);
 141         case SEV_CMD_LAUNCH_UPDATE_SECRET:      return sizeof(struct sev_data_launch_secret);
 142         case SEV_CMD_DOWNLOAD_FIRMWARE:         return sizeof(struct sev_data_download_firmware);
 143         case SEV_CMD_GET_ID:                    return sizeof(struct sev_data_get_id);
 144         default:                                return 0;
 145         }
 146 
 147         return 0;
 148 }
 149 
 150 static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret)
 151 {
 152         struct psp_device *psp = psp_master;
 153         unsigned int phys_lsb, phys_msb;
 154         unsigned int reg, ret = 0;
 155 
 156         if (!psp)
 157                 return -ENODEV;
 158 
 159         if (psp_dead)
 160                 return -EBUSY;
 161 
 162         /* Get the physical address of the command buffer */
 163         phys_lsb = data ? lower_32_bits(__psp_pa(data)) : 0;
 164         phys_msb = data ? upper_32_bits(__psp_pa(data)) : 0;
 165 
 166         dev_dbg(psp->dev, "sev command id %#x buffer 0x%08x%08x timeout %us\n",
 167                 cmd, phys_msb, phys_lsb, psp_timeout);
 168 
 169         print_hex_dump_debug("(in):  ", DUMP_PREFIX_OFFSET, 16, 2, data,
 170                              sev_cmd_buffer_len(cmd), false);
 171 
 172         iowrite32(phys_lsb, psp->io_regs + psp->vdata->cmdbuff_addr_lo_reg);
 173         iowrite32(phys_msb, psp->io_regs + psp->vdata->cmdbuff_addr_hi_reg);
 174 
 175         psp->sev_int_rcvd = 0;
 176 
 177         reg = cmd;
 178         reg <<= PSP_CMDRESP_CMD_SHIFT;
 179         reg |= PSP_CMDRESP_IOC;
 180         iowrite32(reg, psp->io_regs + psp->vdata->cmdresp_reg);
 181 
 182         /* wait for command completion */
 183         ret = sev_wait_cmd_ioc(psp, &reg, psp_timeout);
 184         if (ret) {
 185                 if (psp_ret)
 186                         *psp_ret = 0;
 187 
 188                 dev_err(psp->dev, "sev command %#x timed out, disabling PSP \n", cmd);
 189                 psp_dead = true;
 190 
 191                 return ret;
 192         }
 193 
 194         psp_timeout = psp_cmd_timeout;
 195 
 196         if (psp_ret)
 197                 *psp_ret = reg & PSP_CMDRESP_ERR_MASK;
 198 
 199         if (reg & PSP_CMDRESP_ERR_MASK) {
 200                 dev_dbg(psp->dev, "sev command %#x failed (%#010x)\n",
 201                         cmd, reg & PSP_CMDRESP_ERR_MASK);
 202                 ret = -EIO;
 203         }
 204 
 205         print_hex_dump_debug("(out): ", DUMP_PREFIX_OFFSET, 16, 2, data,
 206                              sev_cmd_buffer_len(cmd), false);
 207 
 208         return ret;
 209 }
 210 
 211 static int sev_do_cmd(int cmd, void *data, int *psp_ret)
 212 {
 213         int rc;
 214 
 215         mutex_lock(&sev_cmd_mutex);
 216         rc = __sev_do_cmd_locked(cmd, data, psp_ret);
 217         mutex_unlock(&sev_cmd_mutex);
 218 
 219         return rc;
 220 }
 221 
 222 static int __sev_platform_init_locked(int *error)
 223 {
 224         struct psp_device *psp = psp_master;
 225         int rc = 0;
 226 
 227         if (!psp)
 228                 return -ENODEV;
 229 
 230         if (psp->sev_state == SEV_STATE_INIT)
 231                 return 0;
 232 
 233         rc = __sev_do_cmd_locked(SEV_CMD_INIT, &psp->init_cmd_buf, error);
 234         if (rc)
 235                 return rc;
 236 
 237         psp->sev_state = SEV_STATE_INIT;
 238         dev_dbg(psp->dev, "SEV firmware initialized\n");
 239 
 240         return rc;
 241 }
 242 
 243 int sev_platform_init(int *error)
 244 {
 245         int rc;
 246 
 247         mutex_lock(&sev_cmd_mutex);
 248         rc = __sev_platform_init_locked(error);
 249         mutex_unlock(&sev_cmd_mutex);
 250 
 251         return rc;
 252 }
 253 EXPORT_SYMBOL_GPL(sev_platform_init);
 254 
 255 static int __sev_platform_shutdown_locked(int *error)
 256 {
 257         int ret;
 258 
 259         ret = __sev_do_cmd_locked(SEV_CMD_SHUTDOWN, NULL, error);
 260         if (ret)
 261                 return ret;
 262 
 263         psp_master->sev_state = SEV_STATE_UNINIT;
 264         dev_dbg(psp_master->dev, "SEV firmware shutdown\n");
 265 
 266         return ret;
 267 }
 268 
 269 static int sev_platform_shutdown(int *error)
 270 {
 271         int rc;
 272 
 273         mutex_lock(&sev_cmd_mutex);
 274         rc = __sev_platform_shutdown_locked(NULL);
 275         mutex_unlock(&sev_cmd_mutex);
 276 
 277         return rc;
 278 }
 279 
 280 static int sev_get_platform_state(int *state, int *error)
 281 {
 282         int rc;
 283 
 284         rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS,
 285                                  &psp_master->status_cmd_buf, error);
 286         if (rc)
 287                 return rc;
 288 
 289         *state = psp_master->status_cmd_buf.state;
 290         return rc;
 291 }
 292 
 293 static int sev_ioctl_do_reset(struct sev_issue_cmd *argp)
 294 {
 295         int state, rc;
 296 
 297         /*
 298          * The SEV spec requires that FACTORY_RESET must be issued in
 299          * UNINIT state. Before we go further lets check if any guest is
 300          * active.
 301          *
 302          * If FW is in WORKING state then deny the request otherwise issue
 303          * SHUTDOWN command do INIT -> UNINIT before issuing the FACTORY_RESET.
 304          *
 305          */
 306         rc = sev_get_platform_state(&state, &argp->error);
 307         if (rc)
 308                 return rc;
 309 
 310         if (state == SEV_STATE_WORKING)
 311                 return -EBUSY;
 312 
 313         if (state == SEV_STATE_INIT) {
 314                 rc = __sev_platform_shutdown_locked(&argp->error);
 315                 if (rc)
 316                         return rc;
 317         }
 318 
 319         return __sev_do_cmd_locked(SEV_CMD_FACTORY_RESET, NULL, &argp->error);
 320 }
 321 
 322 static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp)
 323 {
 324         struct sev_user_data_status *data = &psp_master->status_cmd_buf;
 325         int ret;
 326 
 327         ret = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, data, &argp->error);
 328         if (ret)
 329                 return ret;
 330 
 331         if (copy_to_user((void __user *)argp->data, data, sizeof(*data)))
 332                 ret = -EFAULT;
 333 
 334         return ret;
 335 }
 336 
 337 static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp)
 338 {
 339         int rc;
 340 
 341         if (psp_master->sev_state == SEV_STATE_UNINIT) {
 342                 rc = __sev_platform_init_locked(&argp->error);
 343                 if (rc)
 344                         return rc;
 345         }
 346 
 347         return __sev_do_cmd_locked(cmd, NULL, &argp->error);
 348 }
 349 
 350 static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp)
 351 {
 352         struct sev_user_data_pek_csr input;
 353         struct sev_data_pek_csr *data;
 354         void *blob = NULL;
 355         int ret;
 356 
 357         if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
 358                 return -EFAULT;
 359 
 360         data = kzalloc(sizeof(*data), GFP_KERNEL);
 361         if (!data)
 362                 return -ENOMEM;
 363 
 364         /* userspace wants to query CSR length */
 365         if (!input.address || !input.length)
 366                 goto cmd;
 367 
 368         /* allocate a physically contiguous buffer to store the CSR blob */
 369         if (!access_ok(input.address, input.length) ||
 370             input.length > SEV_FW_BLOB_MAX_SIZE) {
 371                 ret = -EFAULT;
 372                 goto e_free;
 373         }
 374 
 375         blob = kmalloc(input.length, GFP_KERNEL);
 376         if (!blob) {
 377                 ret = -ENOMEM;
 378                 goto e_free;
 379         }
 380 
 381         data->address = __psp_pa(blob);
 382         data->len = input.length;
 383 
 384 cmd:
 385         if (psp_master->sev_state == SEV_STATE_UNINIT) {
 386                 ret = __sev_platform_init_locked(&argp->error);
 387                 if (ret)
 388                         goto e_free_blob;
 389         }
 390 
 391         ret = __sev_do_cmd_locked(SEV_CMD_PEK_CSR, data, &argp->error);
 392 
 393          /* If we query the CSR length, FW responded with expected data. */
 394         input.length = data->len;
 395 
 396         if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
 397                 ret = -EFAULT;
 398                 goto e_free_blob;
 399         }
 400 
 401         if (blob) {
 402                 if (copy_to_user((void __user *)input.address, blob, input.length))
 403                         ret = -EFAULT;
 404         }
 405 
 406 e_free_blob:
 407         kfree(blob);
 408 e_free:
 409         kfree(data);
 410         return ret;
 411 }
 412 
 413 void *psp_copy_user_blob(u64 __user uaddr, u32 len)
 414 {
 415         if (!uaddr || !len)
 416                 return ERR_PTR(-EINVAL);
 417 
 418         /* verify that blob length does not exceed our limit */
 419         if (len > SEV_FW_BLOB_MAX_SIZE)
 420                 return ERR_PTR(-EINVAL);
 421 
 422         return memdup_user((void __user *)(uintptr_t)uaddr, len);
 423 }
 424 EXPORT_SYMBOL_GPL(psp_copy_user_blob);
 425 
 426 static int sev_get_api_version(void)
 427 {
 428         struct sev_user_data_status *status;
 429         int error = 0, ret;
 430 
 431         status = &psp_master->status_cmd_buf;
 432         ret = sev_platform_status(status, &error);
 433         if (ret) {
 434                 dev_err(psp_master->dev,
 435                         "SEV: failed to get status. Error: %#x\n", error);
 436                 return 1;
 437         }
 438 
 439         psp_master->api_major = status->api_major;
 440         psp_master->api_minor = status->api_minor;
 441         psp_master->build = status->build;
 442         psp_master->sev_state = status->state;
 443 
 444         return 0;
 445 }
 446 
 447 static int sev_get_firmware(struct device *dev,
 448                             const struct firmware **firmware)
 449 {
 450         char fw_name_specific[SEV_FW_NAME_SIZE];
 451         char fw_name_subset[SEV_FW_NAME_SIZE];
 452 
 453         snprintf(fw_name_specific, sizeof(fw_name_specific),
 454                  "amd/amd_sev_fam%.2xh_model%.2xh.sbin",
 455                  boot_cpu_data.x86, boot_cpu_data.x86_model);
 456 
 457         snprintf(fw_name_subset, sizeof(fw_name_subset),
 458                  "amd/amd_sev_fam%.2xh_model%.1xxh.sbin",
 459                  boot_cpu_data.x86, (boot_cpu_data.x86_model & 0xf0) >> 4);
 460 
 461         /* Check for SEV FW for a particular model.
 462          * Ex. amd_sev_fam17h_model00h.sbin for Family 17h Model 00h
 463          *
 464          * or
 465          *
 466          * Check for SEV FW common to a subset of models.
 467          * Ex. amd_sev_fam17h_model0xh.sbin for
 468          *     Family 17h Model 00h -- Family 17h Model 0Fh
 469          *
 470          * or
 471          *
 472          * Fall-back to using generic name: sev.fw
 473          */
 474         if ((firmware_request_nowarn(firmware, fw_name_specific, dev) >= 0) ||
 475             (firmware_request_nowarn(firmware, fw_name_subset, dev) >= 0) ||
 476             (firmware_request_nowarn(firmware, SEV_FW_FILE, dev) >= 0))
 477                 return 0;
 478 
 479         return -ENOENT;
 480 }
 481 
 482 /* Don't fail if SEV FW couldn't be updated. Continue with existing SEV FW */
 483 static int sev_update_firmware(struct device *dev)
 484 {
 485         struct sev_data_download_firmware *data;
 486         const struct firmware *firmware;
 487         int ret, error, order;
 488         struct page *p;
 489         u64 data_size;
 490 
 491         if (sev_get_firmware(dev, &firmware) == -ENOENT) {
 492                 dev_dbg(dev, "No SEV firmware file present\n");
 493                 return -1;
 494         }
 495 
 496         /*
 497          * SEV FW expects the physical address given to it to be 32
 498          * byte aligned. Memory allocated has structure placed at the
 499          * beginning followed by the firmware being passed to the SEV
 500          * FW. Allocate enough memory for data structure + alignment
 501          * padding + SEV FW.
 502          */
 503         data_size = ALIGN(sizeof(struct sev_data_download_firmware), 32);
 504 
 505         order = get_order(firmware->size + data_size);
 506         p = alloc_pages(GFP_KERNEL, order);
 507         if (!p) {
 508                 ret = -1;
 509                 goto fw_err;
 510         }
 511 
 512         /*
 513          * Copy firmware data to a kernel allocated contiguous
 514          * memory region.
 515          */
 516         data = page_address(p);
 517         memcpy(page_address(p) + data_size, firmware->data, firmware->size);
 518 
 519         data->address = __psp_pa(page_address(p) + data_size);
 520         data->len = firmware->size;
 521 
 522         ret = sev_do_cmd(SEV_CMD_DOWNLOAD_FIRMWARE, data, &error);
 523         if (ret)
 524                 dev_dbg(dev, "Failed to update SEV firmware: %#x\n", error);
 525         else
 526                 dev_info(dev, "SEV firmware update successful\n");
 527 
 528         __free_pages(p, order);
 529 
 530 fw_err:
 531         release_firmware(firmware);
 532 
 533         return ret;
 534 }
 535 
 536 static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp)
 537 {
 538         struct sev_user_data_pek_cert_import input;
 539         struct sev_data_pek_cert_import *data;
 540         void *pek_blob, *oca_blob;
 541         int ret;
 542 
 543         if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
 544                 return -EFAULT;
 545 
 546         data = kzalloc(sizeof(*data), GFP_KERNEL);
 547         if (!data)
 548                 return -ENOMEM;
 549 
 550         /* copy PEK certificate blobs from userspace */
 551         pek_blob = psp_copy_user_blob(input.pek_cert_address, input.pek_cert_len);
 552         if (IS_ERR(pek_blob)) {
 553                 ret = PTR_ERR(pek_blob);
 554                 goto e_free;
 555         }
 556 
 557         data->pek_cert_address = __psp_pa(pek_blob);
 558         data->pek_cert_len = input.pek_cert_len;
 559 
 560         /* copy PEK certificate blobs from userspace */
 561         oca_blob = psp_copy_user_blob(input.oca_cert_address, input.oca_cert_len);
 562         if (IS_ERR(oca_blob)) {
 563                 ret = PTR_ERR(oca_blob);
 564                 goto e_free_pek;
 565         }
 566 
 567         data->oca_cert_address = __psp_pa(oca_blob);
 568         data->oca_cert_len = input.oca_cert_len;
 569 
 570         /* If platform is not in INIT state then transition it to INIT */
 571         if (psp_master->sev_state != SEV_STATE_INIT) {
 572                 ret = __sev_platform_init_locked(&argp->error);
 573                 if (ret)
 574                         goto e_free_oca;
 575         }
 576 
 577         ret = __sev_do_cmd_locked(SEV_CMD_PEK_CERT_IMPORT, data, &argp->error);
 578 
 579 e_free_oca:
 580         kfree(oca_blob);
 581 e_free_pek:
 582         kfree(pek_blob);
 583 e_free:
 584         kfree(data);
 585         return ret;
 586 }
 587 
 588 static int sev_ioctl_do_get_id2(struct sev_issue_cmd *argp)
 589 {
 590         struct sev_user_data_get_id2 input;
 591         struct sev_data_get_id *data;
 592         void *id_blob = NULL;
 593         int ret;
 594 
 595         /* SEV GET_ID is available from SEV API v0.16 and up */
 596         if (!sev_version_greater_or_equal(0, 16))
 597                 return -ENOTSUPP;
 598 
 599         if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
 600                 return -EFAULT;
 601 
 602         /* Check if we have write access to the userspace buffer */
 603         if (input.address &&
 604             input.length &&
 605             !access_ok(input.address, input.length))
 606                 return -EFAULT;
 607 
 608         data = kzalloc(sizeof(*data), GFP_KERNEL);
 609         if (!data)
 610                 return -ENOMEM;
 611 
 612         if (input.address && input.length) {
 613                 id_blob = kmalloc(input.length, GFP_KERNEL);
 614                 if (!id_blob) {
 615                         kfree(data);
 616                         return -ENOMEM;
 617                 }
 618 
 619                 data->address = __psp_pa(id_blob);
 620                 data->len = input.length;
 621         }
 622 
 623         ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error);
 624 
 625         /*
 626          * Firmware will return the length of the ID value (either the minimum
 627          * required length or the actual length written), return it to the user.
 628          */
 629         input.length = data->len;
 630 
 631         if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
 632                 ret = -EFAULT;
 633                 goto e_free;
 634         }
 635 
 636         if (id_blob) {
 637                 if (copy_to_user((void __user *)input.address,
 638                                  id_blob, data->len)) {
 639                         ret = -EFAULT;
 640                         goto e_free;
 641                 }
 642         }
 643 
 644 e_free:
 645         kfree(id_blob);
 646         kfree(data);
 647 
 648         return ret;
 649 }
 650 
 651 static int sev_ioctl_do_get_id(struct sev_issue_cmd *argp)
 652 {
 653         struct sev_data_get_id *data;
 654         u64 data_size, user_size;
 655         void *id_blob, *mem;
 656         int ret;
 657 
 658         /* SEV GET_ID available from SEV API v0.16 and up */
 659         if (!sev_version_greater_or_equal(0, 16))
 660                 return -ENOTSUPP;
 661 
 662         /* SEV FW expects the buffer it fills with the ID to be
 663          * 8-byte aligned. Memory allocated should be enough to
 664          * hold data structure + alignment padding + memory
 665          * where SEV FW writes the ID.
 666          */
 667         data_size = ALIGN(sizeof(struct sev_data_get_id), 8);
 668         user_size = sizeof(struct sev_user_data_get_id);
 669 
 670         mem = kzalloc(data_size + user_size, GFP_KERNEL);
 671         if (!mem)
 672                 return -ENOMEM;
 673 
 674         data = mem;
 675         id_blob = mem + data_size;
 676 
 677         data->address = __psp_pa(id_blob);
 678         data->len = user_size;
 679 
 680         ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error);
 681         if (!ret) {
 682                 if (copy_to_user((void __user *)argp->data, id_blob, data->len))
 683                         ret = -EFAULT;
 684         }
 685 
 686         kfree(mem);
 687 
 688         return ret;
 689 }
 690 
 691 static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp)
 692 {
 693         struct sev_user_data_pdh_cert_export input;
 694         void *pdh_blob = NULL, *cert_blob = NULL;
 695         struct sev_data_pdh_cert_export *data;
 696         int ret;
 697 
 698         if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
 699                 return -EFAULT;
 700 
 701         data = kzalloc(sizeof(*data), GFP_KERNEL);
 702         if (!data)
 703                 return -ENOMEM;
 704 
 705         /* Userspace wants to query the certificate length. */
 706         if (!input.pdh_cert_address ||
 707             !input.pdh_cert_len ||
 708             !input.cert_chain_address)
 709                 goto cmd;
 710 
 711         /* Allocate a physically contiguous buffer to store the PDH blob. */
 712         if ((input.pdh_cert_len > SEV_FW_BLOB_MAX_SIZE) ||
 713             !access_ok(input.pdh_cert_address, input.pdh_cert_len)) {
 714                 ret = -EFAULT;
 715                 goto e_free;
 716         }
 717 
 718         /* Allocate a physically contiguous buffer to store the cert chain blob. */
 719         if ((input.cert_chain_len > SEV_FW_BLOB_MAX_SIZE) ||
 720             !access_ok(input.cert_chain_address, input.cert_chain_len)) {
 721                 ret = -EFAULT;
 722                 goto e_free;
 723         }
 724 
 725         pdh_blob = kmalloc(input.pdh_cert_len, GFP_KERNEL);
 726         if (!pdh_blob) {
 727                 ret = -ENOMEM;
 728                 goto e_free;
 729         }
 730 
 731         data->pdh_cert_address = __psp_pa(pdh_blob);
 732         data->pdh_cert_len = input.pdh_cert_len;
 733 
 734         cert_blob = kmalloc(input.cert_chain_len, GFP_KERNEL);
 735         if (!cert_blob) {
 736                 ret = -ENOMEM;
 737                 goto e_free_pdh;
 738         }
 739 
 740         data->cert_chain_address = __psp_pa(cert_blob);
 741         data->cert_chain_len = input.cert_chain_len;
 742 
 743 cmd:
 744         /* If platform is not in INIT state then transition it to INIT. */
 745         if (psp_master->sev_state != SEV_STATE_INIT) {
 746                 ret = __sev_platform_init_locked(&argp->error);
 747                 if (ret)
 748                         goto e_free_cert;
 749         }
 750 
 751         ret = __sev_do_cmd_locked(SEV_CMD_PDH_CERT_EXPORT, data, &argp->error);
 752 
 753         /* If we query the length, FW responded with expected data. */
 754         input.cert_chain_len = data->cert_chain_len;
 755         input.pdh_cert_len = data->pdh_cert_len;
 756 
 757         if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
 758                 ret = -EFAULT;
 759                 goto e_free_cert;
 760         }
 761 
 762         if (pdh_blob) {
 763                 if (copy_to_user((void __user *)input.pdh_cert_address,
 764                                  pdh_blob, input.pdh_cert_len)) {
 765                         ret = -EFAULT;
 766                         goto e_free_cert;
 767                 }
 768         }
 769 
 770         if (cert_blob) {
 771                 if (copy_to_user((void __user *)input.cert_chain_address,
 772                                  cert_blob, input.cert_chain_len))
 773                         ret = -EFAULT;
 774         }
 775 
 776 e_free_cert:
 777         kfree(cert_blob);
 778 e_free_pdh:
 779         kfree(pdh_blob);
 780 e_free:
 781         kfree(data);
 782         return ret;
 783 }
 784 
 785 static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
 786 {
 787         void __user *argp = (void __user *)arg;
 788         struct sev_issue_cmd input;
 789         int ret = -EFAULT;
 790 
 791         if (!psp_master)
 792                 return -ENODEV;
 793 
 794         if (ioctl != SEV_ISSUE_CMD)
 795                 return -EINVAL;
 796 
 797         if (copy_from_user(&input, argp, sizeof(struct sev_issue_cmd)))
 798                 return -EFAULT;
 799 
 800         if (input.cmd > SEV_MAX)
 801                 return -EINVAL;
 802 
 803         mutex_lock(&sev_cmd_mutex);
 804 
 805         switch (input.cmd) {
 806 
 807         case SEV_FACTORY_RESET:
 808                 ret = sev_ioctl_do_reset(&input);
 809                 break;
 810         case SEV_PLATFORM_STATUS:
 811                 ret = sev_ioctl_do_platform_status(&input);
 812                 break;
 813         case SEV_PEK_GEN:
 814                 ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PEK_GEN, &input);
 815                 break;
 816         case SEV_PDH_GEN:
 817                 ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PDH_GEN, &input);
 818                 break;
 819         case SEV_PEK_CSR:
 820                 ret = sev_ioctl_do_pek_csr(&input);
 821                 break;
 822         case SEV_PEK_CERT_IMPORT:
 823                 ret = sev_ioctl_do_pek_import(&input);
 824                 break;
 825         case SEV_PDH_CERT_EXPORT:
 826                 ret = sev_ioctl_do_pdh_export(&input);
 827                 break;
 828         case SEV_GET_ID:
 829                 pr_warn_once("SEV_GET_ID command is deprecated, use SEV_GET_ID2\n");
 830                 ret = sev_ioctl_do_get_id(&input);
 831                 break;
 832         case SEV_GET_ID2:
 833                 ret = sev_ioctl_do_get_id2(&input);
 834                 break;
 835         default:
 836                 ret = -EINVAL;
 837                 goto out;
 838         }
 839 
 840         if (copy_to_user(argp, &input, sizeof(struct sev_issue_cmd)))
 841                 ret = -EFAULT;
 842 out:
 843         mutex_unlock(&sev_cmd_mutex);
 844 
 845         return ret;
 846 }
 847 
 848 static const struct file_operations sev_fops = {
 849         .owner  = THIS_MODULE,
 850         .unlocked_ioctl = sev_ioctl,
 851 };
 852 
 853 int sev_platform_status(struct sev_user_data_status *data, int *error)
 854 {
 855         return sev_do_cmd(SEV_CMD_PLATFORM_STATUS, data, error);
 856 }
 857 EXPORT_SYMBOL_GPL(sev_platform_status);
 858 
 859 int sev_guest_deactivate(struct sev_data_deactivate *data, int *error)
 860 {
 861         return sev_do_cmd(SEV_CMD_DEACTIVATE, data, error);
 862 }
 863 EXPORT_SYMBOL_GPL(sev_guest_deactivate);
 864 
 865 int sev_guest_activate(struct sev_data_activate *data, int *error)
 866 {
 867         return sev_do_cmd(SEV_CMD_ACTIVATE, data, error);
 868 }
 869 EXPORT_SYMBOL_GPL(sev_guest_activate);
 870 
 871 int sev_guest_decommission(struct sev_data_decommission *data, int *error)
 872 {
 873         return sev_do_cmd(SEV_CMD_DECOMMISSION, data, error);
 874 }
 875 EXPORT_SYMBOL_GPL(sev_guest_decommission);
 876 
 877 int sev_guest_df_flush(int *error)
 878 {
 879         return sev_do_cmd(SEV_CMD_DF_FLUSH, NULL, error);
 880 }
 881 EXPORT_SYMBOL_GPL(sev_guest_df_flush);
 882 
 883 static void sev_exit(struct kref *ref)
 884 {
 885         struct sev_misc_dev *misc_dev = container_of(ref, struct sev_misc_dev, refcount);
 886 
 887         misc_deregister(&misc_dev->misc);
 888 }
 889 
 890 static int sev_misc_init(struct psp_device *psp)
 891 {
 892         struct device *dev = psp->dev;
 893         int ret;
 894 
 895         /*
 896          * SEV feature support can be detected on multiple devices but the SEV
 897          * FW commands must be issued on the master. During probe, we do not
 898          * know the master hence we create /dev/sev on the first device probe.
 899          * sev_do_cmd() finds the right master device to which to issue the
 900          * command to the firmware.
 901          */
 902         if (!misc_dev) {
 903                 struct miscdevice *misc;
 904 
 905                 misc_dev = devm_kzalloc(dev, sizeof(*misc_dev), GFP_KERNEL);
 906                 if (!misc_dev)
 907                         return -ENOMEM;
 908 
 909                 misc = &misc_dev->misc;
 910                 misc->minor = MISC_DYNAMIC_MINOR;
 911                 misc->name = DEVICE_NAME;
 912                 misc->fops = &sev_fops;
 913 
 914                 ret = misc_register(misc);
 915                 if (ret)
 916                         return ret;
 917 
 918                 kref_init(&misc_dev->refcount);
 919         } else {
 920                 kref_get(&misc_dev->refcount);
 921         }
 922 
 923         init_waitqueue_head(&psp->sev_int_queue);
 924         psp->sev_misc = misc_dev;
 925         dev_dbg(dev, "registered SEV device\n");
 926 
 927         return 0;
 928 }
 929 
 930 static int psp_check_sev_support(struct psp_device *psp)
 931 {
 932         /* Check if device supports SEV feature */
 933         if (!(ioread32(psp->io_regs + psp->vdata->feature_reg) & 1)) {
 934                 dev_dbg(psp->dev, "psp does not support SEV\n");
 935                 return -ENODEV;
 936         }
 937 
 938         return 0;
 939 }
 940 
 941 int psp_dev_init(struct sp_device *sp)
 942 {
 943         struct device *dev = sp->dev;
 944         struct psp_device *psp;
 945         int ret;
 946 
 947         ret = -ENOMEM;
 948         psp = psp_alloc_struct(sp);
 949         if (!psp)
 950                 goto e_err;
 951 
 952         sp->psp_data = psp;
 953 
 954         psp->vdata = (struct psp_vdata *)sp->dev_vdata->psp_vdata;
 955         if (!psp->vdata) {
 956                 ret = -ENODEV;
 957                 dev_err(dev, "missing driver data\n");
 958                 goto e_err;
 959         }
 960 
 961         psp->io_regs = sp->io_map;
 962 
 963         ret = psp_check_sev_support(psp);
 964         if (ret)
 965                 goto e_disable;
 966 
 967         /* Disable and clear interrupts until ready */
 968         iowrite32(0, psp->io_regs + psp->vdata->inten_reg);
 969         iowrite32(-1, psp->io_regs + psp->vdata->intsts_reg);
 970 
 971         /* Request an irq */
 972         ret = sp_request_psp_irq(psp->sp, psp_irq_handler, psp->name, psp);
 973         if (ret) {
 974                 dev_err(dev, "psp: unable to allocate an IRQ\n");
 975                 goto e_err;
 976         }
 977 
 978         ret = sev_misc_init(psp);
 979         if (ret)
 980                 goto e_irq;
 981 
 982         if (sp->set_psp_master_device)
 983                 sp->set_psp_master_device(sp);
 984 
 985         /* Enable interrupt */
 986         iowrite32(-1, psp->io_regs + psp->vdata->inten_reg);
 987 
 988         dev_notice(dev, "psp enabled\n");
 989 
 990         return 0;
 991 
 992 e_irq:
 993         sp_free_psp_irq(psp->sp, psp);
 994 e_err:
 995         sp->psp_data = NULL;
 996 
 997         dev_notice(dev, "psp initialization failed\n");
 998 
 999         return ret;
1000 
1001 e_disable:
1002         sp->psp_data = NULL;
1003 
1004         return ret;
1005 }
1006 
1007 void psp_dev_destroy(struct sp_device *sp)
1008 {
1009         struct psp_device *psp = sp->psp_data;
1010 
1011         if (!psp)
1012                 return;
1013 
1014         if (psp->sev_misc)
1015                 kref_put(&misc_dev->refcount, sev_exit);
1016 
1017         sp_free_psp_irq(sp, psp);
1018 }
1019 
1020 int sev_issue_cmd_external_user(struct file *filep, unsigned int cmd,
1021                                 void *data, int *error)
1022 {
1023         if (!filep || filep->f_op != &sev_fops)
1024                 return -EBADF;
1025 
1026         return  sev_do_cmd(cmd, data, error);
1027 }
1028 EXPORT_SYMBOL_GPL(sev_issue_cmd_external_user);
1029 
1030 void psp_pci_init(void)
1031 {
1032         struct sp_device *sp;
1033         int error, rc;
1034 
1035         sp = sp_get_psp_master_device();
1036         if (!sp)
1037                 return;
1038 
1039         psp_master = sp->psp_data;
1040 
1041         psp_timeout = psp_probe_timeout;
1042 
1043         if (sev_get_api_version())
1044                 goto err;
1045 
1046         /*
1047          * If platform is not in UNINIT state then firmware upgrade and/or
1048          * platform INIT command will fail. These command require UNINIT state.
1049          *
1050          * In a normal boot we should never run into case where the firmware
1051          * is not in UNINIT state on boot. But in case of kexec boot, a reboot
1052          * may not go through a typical shutdown sequence and may leave the
1053          * firmware in INIT or WORKING state.
1054          */
1055 
1056         if (psp_master->sev_state != SEV_STATE_UNINIT) {
1057                 sev_platform_shutdown(NULL);
1058                 psp_master->sev_state = SEV_STATE_UNINIT;
1059         }
1060 
1061         if (sev_version_greater_or_equal(0, 15) &&
1062             sev_update_firmware(psp_master->dev) == 0)
1063                 sev_get_api_version();
1064 
1065         /* Initialize the platform */
1066         rc = sev_platform_init(&error);
1067         if (rc) {
1068                 dev_err(sp->dev, "SEV: failed to INIT error %#x\n", error);
1069                 return;
1070         }
1071 
1072         dev_info(sp->dev, "SEV API:%d.%d build:%d\n", psp_master->api_major,
1073                  psp_master->api_minor, psp_master->build);
1074 
1075         return;
1076 
1077 err:
1078         psp_master = NULL;
1079 }
1080 
1081 void psp_pci_exit(void)
1082 {
1083         if (!psp_master)
1084                 return;
1085 
1086         sev_platform_shutdown(NULL);
1087 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/crypto/ccp/psp-dev.c

DEFINITIONS
