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/bitfield.h>
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/kthread.h>
14 #include <linux/sched.h>
15 #include <linux/interrupt.h>
16 #include <linux/spinlock.h>
17 #include <linux/spinlock_types.h>
18 #include <linux/types.h>
19 #include <linux/mutex.h>
20 #include <linux/delay.h>
21 #include <linux/hw_random.h>
22 #include <linux/ccp.h>
23 #include <linux/firmware.h>
24 #include <linux/gfp.h>
25 #include <linux/cpufeature.h>
26 #include <linux/fs.h>
27 #include <linux/fs_struct.h>
28 #include <linux/psp.h>
29
30 #include <asm/smp.h>
31 #include <asm/cacheflush.h>
32
33 #include "psp-dev.h"
34 #include "sev-dev.h"
35
36 #define DEVICE_NAME "sev"
37 #define SEV_FW_FILE "amd/sev.fw"
38 #define SEV_FW_NAME_SIZE 64
39
40 static DEFINE_MUTEX(sev_cmd_mutex);
41 static struct sev_misc_dev *misc_dev;
42
43 static int psp_cmd_timeout = 100;
44 module_param(psp_cmd_timeout, int, 0644);
45 MODULE_PARM_DESC(psp_cmd_timeout, " default timeout value, in seconds, for PSP commands");
46
47 static int psp_probe_timeout = 5;
48 module_param(psp_probe_timeout, int, 0644);
49 MODULE_PARM_DESC(psp_probe_timeout, " default timeout value, in seconds, during PSP device probe");
50
51 static char *init_ex_path;
52 module_param(init_ex_path, charp, 0444);
53 MODULE_PARM_DESC(init_ex_path, " Path for INIT_EX data; if set try INIT_EX");
54
55 static bool psp_init_on_probe = true;
56 module_param(psp_init_on_probe, bool, 0444);
57 MODULE_PARM_DESC(psp_init_on_probe, " if true, the PSP will be initialized on module init. Else the PSP will be initialized on the first command requiring it");
58
59 MODULE_FIRMWARE("amd/amd_sev_fam17h_model0xh.sbin"); /* 1st gen EPYC */
60 MODULE_FIRMWARE("amd/amd_sev_fam17h_model3xh.sbin"); /* 2nd gen EPYC */
61 MODULE_FIRMWARE("amd/amd_sev_fam19h_model0xh.sbin"); /* 3rd gen EPYC */
62 MODULE_FIRMWARE("amd/amd_sev_fam19h_model1xh.sbin"); /* 4th gen EPYC */
63
64 static bool psp_dead;
65 static int psp_timeout;
66
67 /* Trusted Memory Region (TMR):
68 * The TMR is a 1MB area that must be 1MB aligned. Use the page allocator
69 * to allocate the memory, which will return aligned memory for the specified
70 * allocation order.
71 */
72 #define SEV_ES_TMR_SIZE (1024 * 1024)
73 static void *sev_es_tmr;
74
75 /* INIT_EX NV Storage:
76 * The NV Storage is a 32Kb area and must be 4Kb page aligned. Use the page
77 * allocator to allocate the memory, which will return aligned memory for the
78 * specified allocation order.
79 */
80 #define NV_LENGTH (32 * 1024)
81 static void *sev_init_ex_buffer;
82
sev_version_greater_or_equal(u8 maj,u8 min)83 static inline bool sev_version_greater_or_equal(u8 maj, u8 min)
84 {
85 struct sev_device *sev = psp_master->sev_data;
86
87 if (sev->api_major > maj)
88 return true;
89
90 if (sev->api_major == maj && sev->api_minor >= min)
91 return true;
92
93 return false;
94 }
95
sev_irq_handler(int irq,void * data,unsigned int status)96 static void sev_irq_handler(int irq, void *data, unsigned int status)
97 {
98 struct sev_device *sev = data;
99 int reg;
100
101 /* Check if it is command completion: */
102 if (!(status & SEV_CMD_COMPLETE))
103 return;
104
105 /* Check if it is SEV command completion: */
106 reg = ioread32(sev->io_regs + sev->vdata->cmdresp_reg);
107 if (FIELD_GET(PSP_CMDRESP_RESP, reg)) {
108 sev->int_rcvd = 1;
109 wake_up(&sev->int_queue);
110 }
111 }
112
sev_wait_cmd_ioc(struct sev_device * sev,unsigned int * reg,unsigned int timeout)113 static int sev_wait_cmd_ioc(struct sev_device *sev,
114 unsigned int *reg, unsigned int timeout)
115 {
116 int ret;
117
118 ret = wait_event_timeout(sev->int_queue,
119 sev->int_rcvd, timeout * HZ);
120 if (!ret)
121 return -ETIMEDOUT;
122
123 *reg = ioread32(sev->io_regs + sev->vdata->cmdresp_reg);
124
125 return 0;
126 }
127
sev_cmd_buffer_len(int cmd)128 static int sev_cmd_buffer_len(int cmd)
129 {
130 switch (cmd) {
131 case SEV_CMD_INIT: return sizeof(struct sev_data_init);
132 case SEV_CMD_INIT_EX: return sizeof(struct sev_data_init_ex);
133 case SEV_CMD_PLATFORM_STATUS: return sizeof(struct sev_user_data_status);
134 case SEV_CMD_PEK_CSR: return sizeof(struct sev_data_pek_csr);
135 case SEV_CMD_PEK_CERT_IMPORT: return sizeof(struct sev_data_pek_cert_import);
136 case SEV_CMD_PDH_CERT_EXPORT: return sizeof(struct sev_data_pdh_cert_export);
137 case SEV_CMD_LAUNCH_START: return sizeof(struct sev_data_launch_start);
138 case SEV_CMD_LAUNCH_UPDATE_DATA: return sizeof(struct sev_data_launch_update_data);
139 case SEV_CMD_LAUNCH_UPDATE_VMSA: return sizeof(struct sev_data_launch_update_vmsa);
140 case SEV_CMD_LAUNCH_FINISH: return sizeof(struct sev_data_launch_finish);
141 case SEV_CMD_LAUNCH_MEASURE: return sizeof(struct sev_data_launch_measure);
142 case SEV_CMD_ACTIVATE: return sizeof(struct sev_data_activate);
143 case SEV_CMD_DEACTIVATE: return sizeof(struct sev_data_deactivate);
144 case SEV_CMD_DECOMMISSION: return sizeof(struct sev_data_decommission);
145 case SEV_CMD_GUEST_STATUS: return sizeof(struct sev_data_guest_status);
146 case SEV_CMD_DBG_DECRYPT: return sizeof(struct sev_data_dbg);
147 case SEV_CMD_DBG_ENCRYPT: return sizeof(struct sev_data_dbg);
148 case SEV_CMD_SEND_START: return sizeof(struct sev_data_send_start);
149 case SEV_CMD_SEND_UPDATE_DATA: return sizeof(struct sev_data_send_update_data);
150 case SEV_CMD_SEND_UPDATE_VMSA: return sizeof(struct sev_data_send_update_vmsa);
151 case SEV_CMD_SEND_FINISH: return sizeof(struct sev_data_send_finish);
152 case SEV_CMD_RECEIVE_START: return sizeof(struct sev_data_receive_start);
153 case SEV_CMD_RECEIVE_FINISH: return sizeof(struct sev_data_receive_finish);
154 case SEV_CMD_RECEIVE_UPDATE_DATA: return sizeof(struct sev_data_receive_update_data);
155 case SEV_CMD_RECEIVE_UPDATE_VMSA: return sizeof(struct sev_data_receive_update_vmsa);
156 case SEV_CMD_LAUNCH_UPDATE_SECRET: return sizeof(struct sev_data_launch_secret);
157 case SEV_CMD_DOWNLOAD_FIRMWARE: return sizeof(struct sev_data_download_firmware);
158 case SEV_CMD_GET_ID: return sizeof(struct sev_data_get_id);
159 case SEV_CMD_ATTESTATION_REPORT: return sizeof(struct sev_data_attestation_report);
160 case SEV_CMD_SEND_CANCEL: return sizeof(struct sev_data_send_cancel);
161 default: return 0;
162 }
163
164 return 0;
165 }
166
sev_fw_alloc(unsigned long len)167 static void *sev_fw_alloc(unsigned long len)
168 {
169 struct page *page;
170
171 page = alloc_pages(GFP_KERNEL, get_order(len));
172 if (!page)
173 return NULL;
174
175 return page_address(page);
176 }
177
open_file_as_root(const char * filename,int flags,umode_t mode)178 static struct file *open_file_as_root(const char *filename, int flags, umode_t mode)
179 {
180 struct file *fp;
181 struct path root;
182 struct cred *cred;
183 const struct cred *old_cred;
184
185 task_lock(&init_task);
186 get_fs_root(init_task.fs, &root);
187 task_unlock(&init_task);
188
189 cred = prepare_creds();
190 if (!cred)
191 return ERR_PTR(-ENOMEM);
192 cred->fsuid = GLOBAL_ROOT_UID;
193 old_cred = override_creds(cred);
194
195 fp = file_open_root(&root, filename, flags, mode);
196 path_put(&root);
197
198 revert_creds(old_cred);
199
200 return fp;
201 }
202
sev_read_init_ex_file(void)203 static int sev_read_init_ex_file(void)
204 {
205 struct sev_device *sev = psp_master->sev_data;
206 struct file *fp;
207 ssize_t nread;
208
209 lockdep_assert_held(&sev_cmd_mutex);
210
211 if (!sev_init_ex_buffer)
212 return -EOPNOTSUPP;
213
214 fp = open_file_as_root(init_ex_path, O_RDONLY, 0);
215 if (IS_ERR(fp)) {
216 int ret = PTR_ERR(fp);
217
218 if (ret == -ENOENT) {
219 dev_info(sev->dev,
220 "SEV: %s does not exist and will be created later.\n",
221 init_ex_path);
222 ret = 0;
223 } else {
224 dev_err(sev->dev,
225 "SEV: could not open %s for read, error %d\n",
226 init_ex_path, ret);
227 }
228 return ret;
229 }
230
231 nread = kernel_read(fp, sev_init_ex_buffer, NV_LENGTH, NULL);
232 if (nread != NV_LENGTH) {
233 dev_info(sev->dev,
234 "SEV: could not read %u bytes to non volatile memory area, ret %ld\n",
235 NV_LENGTH, nread);
236 }
237
238 dev_dbg(sev->dev, "SEV: read %ld bytes from NV file\n", nread);
239 filp_close(fp, NULL);
240
241 return 0;
242 }
243
sev_write_init_ex_file(void)244 static int sev_write_init_ex_file(void)
245 {
246 struct sev_device *sev = psp_master->sev_data;
247 struct file *fp;
248 loff_t offset = 0;
249 ssize_t nwrite;
250
251 lockdep_assert_held(&sev_cmd_mutex);
252
253 if (!sev_init_ex_buffer)
254 return 0;
255
256 fp = open_file_as_root(init_ex_path, O_CREAT | O_WRONLY, 0600);
257 if (IS_ERR(fp)) {
258 int ret = PTR_ERR(fp);
259
260 dev_err(sev->dev,
261 "SEV: could not open file for write, error %d\n",
262 ret);
263 return ret;
264 }
265
266 nwrite = kernel_write(fp, sev_init_ex_buffer, NV_LENGTH, &offset);
267 vfs_fsync(fp, 0);
268 filp_close(fp, NULL);
269
270 if (nwrite != NV_LENGTH) {
271 dev_err(sev->dev,
272 "SEV: failed to write %u bytes to non volatile memory area, ret %ld\n",
273 NV_LENGTH, nwrite);
274 return -EIO;
275 }
276
277 dev_dbg(sev->dev, "SEV: write successful to NV file\n");
278
279 return 0;
280 }
281
sev_write_init_ex_file_if_required(int cmd_id)282 static int sev_write_init_ex_file_if_required(int cmd_id)
283 {
284 lockdep_assert_held(&sev_cmd_mutex);
285
286 if (!sev_init_ex_buffer)
287 return 0;
288
289 /*
290 * Only a few platform commands modify the SPI/NV area, but none of the
291 * non-platform commands do. Only INIT(_EX), PLATFORM_RESET, PEK_GEN,
292 * PEK_CERT_IMPORT, and PDH_GEN do.
293 */
294 switch (cmd_id) {
295 case SEV_CMD_FACTORY_RESET:
296 case SEV_CMD_INIT_EX:
297 case SEV_CMD_PDH_GEN:
298 case SEV_CMD_PEK_CERT_IMPORT:
299 case SEV_CMD_PEK_GEN:
300 break;
301 default:
302 return 0;
303 }
304
305 return sev_write_init_ex_file();
306 }
307
__sev_do_cmd_locked(int cmd,void * data,int * psp_ret)308 static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret)
309 {
310 struct psp_device *psp = psp_master;
311 struct sev_device *sev;
312 unsigned int phys_lsb, phys_msb;
313 unsigned int reg, ret = 0;
314 int buf_len;
315
316 if (!psp || !psp->sev_data)
317 return -ENODEV;
318
319 if (psp_dead)
320 return -EBUSY;
321
322 sev = psp->sev_data;
323
324 buf_len = sev_cmd_buffer_len(cmd);
325 if (WARN_ON_ONCE(!data != !buf_len))
326 return -EINVAL;
327
328 /*
329 * Copy the incoming data to driver's scratch buffer as __pa() will not
330 * work for some memory, e.g. vmalloc'd addresses, and @data may not be
331 * physically contiguous.
332 */
333 if (data)
334 memcpy(sev->cmd_buf, data, buf_len);
335
336 /* Get the physical address of the command buffer */
337 phys_lsb = data ? lower_32_bits(__psp_pa(sev->cmd_buf)) : 0;
338 phys_msb = data ? upper_32_bits(__psp_pa(sev->cmd_buf)) : 0;
339
340 dev_dbg(sev->dev, "sev command id %#x buffer 0x%08x%08x timeout %us\n",
341 cmd, phys_msb, phys_lsb, psp_timeout);
342
343 print_hex_dump_debug("(in): ", DUMP_PREFIX_OFFSET, 16, 2, data,
344 buf_len, false);
345
346 iowrite32(phys_lsb, sev->io_regs + sev->vdata->cmdbuff_addr_lo_reg);
347 iowrite32(phys_msb, sev->io_regs + sev->vdata->cmdbuff_addr_hi_reg);
348
349 sev->int_rcvd = 0;
350
351 reg = FIELD_PREP(SEV_CMDRESP_CMD, cmd) | SEV_CMDRESP_IOC;
352 iowrite32(reg, sev->io_regs + sev->vdata->cmdresp_reg);
353
354 /* wait for command completion */
355 ret = sev_wait_cmd_ioc(sev, ®, psp_timeout);
356 if (ret) {
357 if (psp_ret)
358 *psp_ret = 0;
359
360 dev_err(sev->dev, "sev command %#x timed out, disabling PSP\n", cmd);
361 psp_dead = true;
362
363 return ret;
364 }
365
366 psp_timeout = psp_cmd_timeout;
367
368 if (psp_ret)
369 *psp_ret = FIELD_GET(PSP_CMDRESP_STS, reg);
370
371 if (FIELD_GET(PSP_CMDRESP_STS, reg)) {
372 dev_dbg(sev->dev, "sev command %#x failed (%#010lx)\n",
373 cmd, FIELD_GET(PSP_CMDRESP_STS, reg));
374 ret = -EIO;
375 } else {
376 ret = sev_write_init_ex_file_if_required(cmd);
377 }
378
379 print_hex_dump_debug("(out): ", DUMP_PREFIX_OFFSET, 16, 2, data,
380 buf_len, false);
381
382 /*
383 * Copy potential output from the PSP back to data. Do this even on
384 * failure in case the caller wants to glean something from the error.
385 */
386 if (data)
387 memcpy(data, sev->cmd_buf, buf_len);
388
389 return ret;
390 }
391
sev_do_cmd(int cmd,void * data,int * psp_ret)392 static int sev_do_cmd(int cmd, void *data, int *psp_ret)
393 {
394 int rc;
395
396 mutex_lock(&sev_cmd_mutex);
397 rc = __sev_do_cmd_locked(cmd, data, psp_ret);
398 mutex_unlock(&sev_cmd_mutex);
399
400 return rc;
401 }
402
__sev_init_locked(int * error)403 static int __sev_init_locked(int *error)
404 {
405 struct sev_data_init data;
406
407 memset(&data, 0, sizeof(data));
408 if (sev_es_tmr) {
409 /*
410 * Do not include the encryption mask on the physical
411 * address of the TMR (firmware should clear it anyway).
412 */
413 data.tmr_address = __pa(sev_es_tmr);
414
415 data.flags |= SEV_INIT_FLAGS_SEV_ES;
416 data.tmr_len = SEV_ES_TMR_SIZE;
417 }
418
419 return __sev_do_cmd_locked(SEV_CMD_INIT, &data, error);
420 }
421
__sev_init_ex_locked(int * error)422 static int __sev_init_ex_locked(int *error)
423 {
424 struct sev_data_init_ex data;
425
426 memset(&data, 0, sizeof(data));
427 data.length = sizeof(data);
428 data.nv_address = __psp_pa(sev_init_ex_buffer);
429 data.nv_len = NV_LENGTH;
430
431 if (sev_es_tmr) {
432 /*
433 * Do not include the encryption mask on the physical
434 * address of the TMR (firmware should clear it anyway).
435 */
436 data.tmr_address = __pa(sev_es_tmr);
437
438 data.flags |= SEV_INIT_FLAGS_SEV_ES;
439 data.tmr_len = SEV_ES_TMR_SIZE;
440 }
441
442 return __sev_do_cmd_locked(SEV_CMD_INIT_EX, &data, error);
443 }
444
__sev_do_init_locked(int * psp_ret)445 static inline int __sev_do_init_locked(int *psp_ret)
446 {
447 if (sev_init_ex_buffer)
448 return __sev_init_ex_locked(psp_ret);
449 else
450 return __sev_init_locked(psp_ret);
451 }
452
__sev_platform_init_locked(int * error)453 static int __sev_platform_init_locked(int *error)
454 {
455 int rc = 0, psp_ret = SEV_RET_NO_FW_CALL;
456 struct psp_device *psp = psp_master;
457 struct sev_device *sev;
458
459 if (!psp || !psp->sev_data)
460 return -ENODEV;
461
462 sev = psp->sev_data;
463
464 if (sev->state == SEV_STATE_INIT)
465 return 0;
466
467 if (sev_init_ex_buffer) {
468 rc = sev_read_init_ex_file();
469 if (rc)
470 return rc;
471 }
472
473 rc = __sev_do_init_locked(&psp_ret);
474 if (rc && psp_ret == SEV_RET_SECURE_DATA_INVALID) {
475 /*
476 * Initialization command returned an integrity check failure
477 * status code, meaning that firmware load and validation of SEV
478 * related persistent data has failed. Retrying the
479 * initialization function should succeed by replacing the state
480 * with a reset state.
481 */
482 dev_err(sev->dev,
483 "SEV: retrying INIT command because of SECURE_DATA_INVALID error. Retrying once to reset PSP SEV state.");
484 rc = __sev_do_init_locked(&psp_ret);
485 }
486
487 if (error)
488 *error = psp_ret;
489
490 if (rc)
491 return rc;
492
493 sev->state = SEV_STATE_INIT;
494
495 /* Prepare for first SEV guest launch after INIT */
496 wbinvd_on_all_cpus();
497 rc = __sev_do_cmd_locked(SEV_CMD_DF_FLUSH, NULL, error);
498 if (rc)
499 return rc;
500
501 dev_dbg(sev->dev, "SEV firmware initialized\n");
502
503 dev_info(sev->dev, "SEV API:%d.%d build:%d\n", sev->api_major,
504 sev->api_minor, sev->build);
505
506 return 0;
507 }
508
sev_platform_init(int * error)509 int sev_platform_init(int *error)
510 {
511 int rc;
512
513 mutex_lock(&sev_cmd_mutex);
514 rc = __sev_platform_init_locked(error);
515 mutex_unlock(&sev_cmd_mutex);
516
517 return rc;
518 }
519 EXPORT_SYMBOL_GPL(sev_platform_init);
520
__sev_platform_shutdown_locked(int * error)521 static int __sev_platform_shutdown_locked(int *error)
522 {
523 struct psp_device *psp = psp_master;
524 struct sev_device *sev;
525 int ret;
526
527 if (!psp || !psp->sev_data)
528 return 0;
529
530 sev = psp->sev_data;
531
532 if (sev->state == SEV_STATE_UNINIT)
533 return 0;
534
535 ret = __sev_do_cmd_locked(SEV_CMD_SHUTDOWN, NULL, error);
536 if (ret)
537 return ret;
538
539 sev->state = SEV_STATE_UNINIT;
540 dev_dbg(sev->dev, "SEV firmware shutdown\n");
541
542 return ret;
543 }
544
sev_platform_shutdown(int * error)545 static int sev_platform_shutdown(int *error)
546 {
547 int rc;
548
549 mutex_lock(&sev_cmd_mutex);
550 rc = __sev_platform_shutdown_locked(NULL);
551 mutex_unlock(&sev_cmd_mutex);
552
553 return rc;
554 }
555
sev_get_platform_state(int * state,int * error)556 static int sev_get_platform_state(int *state, int *error)
557 {
558 struct sev_user_data_status data;
559 int rc;
560
561 rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, &data, error);
562 if (rc)
563 return rc;
564
565 *state = data.state;
566 return rc;
567 }
568
sev_ioctl_do_reset(struct sev_issue_cmd * argp,bool writable)569 static int sev_ioctl_do_reset(struct sev_issue_cmd *argp, bool writable)
570 {
571 int state, rc;
572
573 if (!writable)
574 return -EPERM;
575
576 /*
577 * The SEV spec requires that FACTORY_RESET must be issued in
578 * UNINIT state. Before we go further lets check if any guest is
579 * active.
580 *
581 * If FW is in WORKING state then deny the request otherwise issue
582 * SHUTDOWN command do INIT -> UNINIT before issuing the FACTORY_RESET.
583 *
584 */
585 rc = sev_get_platform_state(&state, &argp->error);
586 if (rc)
587 return rc;
588
589 if (state == SEV_STATE_WORKING)
590 return -EBUSY;
591
592 if (state == SEV_STATE_INIT) {
593 rc = __sev_platform_shutdown_locked(&argp->error);
594 if (rc)
595 return rc;
596 }
597
598 return __sev_do_cmd_locked(SEV_CMD_FACTORY_RESET, NULL, &argp->error);
599 }
600
sev_ioctl_do_platform_status(struct sev_issue_cmd * argp)601 static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp)
602 {
603 struct sev_user_data_status data;
604 int ret;
605
606 memset(&data, 0, sizeof(data));
607
608 ret = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, &data, &argp->error);
609 if (ret)
610 return ret;
611
612 if (copy_to_user((void __user *)argp->data, &data, sizeof(data)))
613 ret = -EFAULT;
614
615 return ret;
616 }
617
sev_ioctl_do_pek_pdh_gen(int cmd,struct sev_issue_cmd * argp,bool writable)618 static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp, bool writable)
619 {
620 struct sev_device *sev = psp_master->sev_data;
621 int rc;
622
623 if (!writable)
624 return -EPERM;
625
626 if (sev->state == SEV_STATE_UNINIT) {
627 rc = __sev_platform_init_locked(&argp->error);
628 if (rc)
629 return rc;
630 }
631
632 return __sev_do_cmd_locked(cmd, NULL, &argp->error);
633 }
634
sev_ioctl_do_pek_csr(struct sev_issue_cmd * argp,bool writable)635 static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp, bool writable)
636 {
637 struct sev_device *sev = psp_master->sev_data;
638 struct sev_user_data_pek_csr input;
639 struct sev_data_pek_csr data;
640 void __user *input_address;
641 void *blob = NULL;
642 int ret;
643
644 if (!writable)
645 return -EPERM;
646
647 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
648 return -EFAULT;
649
650 memset(&data, 0, sizeof(data));
651
652 /* userspace wants to query CSR length */
653 if (!input.address || !input.length)
654 goto cmd;
655
656 /* allocate a physically contiguous buffer to store the CSR blob */
657 input_address = (void __user *)input.address;
658 if (input.length > SEV_FW_BLOB_MAX_SIZE)
659 return -EFAULT;
660
661 blob = kzalloc(input.length, GFP_KERNEL);
662 if (!blob)
663 return -ENOMEM;
664
665 data.address = __psp_pa(blob);
666 data.len = input.length;
667
668 cmd:
669 if (sev->state == SEV_STATE_UNINIT) {
670 ret = __sev_platform_init_locked(&argp->error);
671 if (ret)
672 goto e_free_blob;
673 }
674
675 ret = __sev_do_cmd_locked(SEV_CMD_PEK_CSR, &data, &argp->error);
676
677 /* If we query the CSR length, FW responded with expected data. */
678 input.length = data.len;
679
680 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
681 ret = -EFAULT;
682 goto e_free_blob;
683 }
684
685 if (blob) {
686 if (copy_to_user(input_address, blob, input.length))
687 ret = -EFAULT;
688 }
689
690 e_free_blob:
691 kfree(blob);
692 return ret;
693 }
694
psp_copy_user_blob(u64 uaddr,u32 len)695 void *psp_copy_user_blob(u64 uaddr, u32 len)
696 {
697 if (!uaddr || !len)
698 return ERR_PTR(-EINVAL);
699
700 /* verify that blob length does not exceed our limit */
701 if (len > SEV_FW_BLOB_MAX_SIZE)
702 return ERR_PTR(-EINVAL);
703
704 return memdup_user((void __user *)uaddr, len);
705 }
706 EXPORT_SYMBOL_GPL(psp_copy_user_blob);
707
sev_get_api_version(void)708 static int sev_get_api_version(void)
709 {
710 struct sev_device *sev = psp_master->sev_data;
711 struct sev_user_data_status status;
712 int error = 0, ret;
713
714 ret = sev_platform_status(&status, &error);
715 if (ret) {
716 dev_err(sev->dev,
717 "SEV: failed to get status. Error: %#x\n", error);
718 return 1;
719 }
720
721 sev->api_major = status.api_major;
722 sev->api_minor = status.api_minor;
723 sev->build = status.build;
724 sev->state = status.state;
725
726 return 0;
727 }
728
sev_get_firmware(struct device * dev,const struct firmware ** firmware)729 static int sev_get_firmware(struct device *dev,
730 const struct firmware **firmware)
731 {
732 char fw_name_specific[SEV_FW_NAME_SIZE];
733 char fw_name_subset[SEV_FW_NAME_SIZE];
734
735 snprintf(fw_name_specific, sizeof(fw_name_specific),
736 "amd/amd_sev_fam%.2xh_model%.2xh.sbin",
737 boot_cpu_data.x86, boot_cpu_data.x86_model);
738
739 snprintf(fw_name_subset, sizeof(fw_name_subset),
740 "amd/amd_sev_fam%.2xh_model%.1xxh.sbin",
741 boot_cpu_data.x86, (boot_cpu_data.x86_model & 0xf0) >> 4);
742
743 /* Check for SEV FW for a particular model.
744 * Ex. amd_sev_fam17h_model00h.sbin for Family 17h Model 00h
745 *
746 * or
747 *
748 * Check for SEV FW common to a subset of models.
749 * Ex. amd_sev_fam17h_model0xh.sbin for
750 * Family 17h Model 00h -- Family 17h Model 0Fh
751 *
752 * or
753 *
754 * Fall-back to using generic name: sev.fw
755 */
756 if ((firmware_request_nowarn(firmware, fw_name_specific, dev) >= 0) ||
757 (firmware_request_nowarn(firmware, fw_name_subset, dev) >= 0) ||
758 (firmware_request_nowarn(firmware, SEV_FW_FILE, dev) >= 0))
759 return 0;
760
761 return -ENOENT;
762 }
763
764 /* Don't fail if SEV FW couldn't be updated. Continue with existing SEV FW */
sev_update_firmware(struct device * dev)765 static int sev_update_firmware(struct device *dev)
766 {
767 struct sev_data_download_firmware *data;
768 const struct firmware *firmware;
769 int ret, error, order;
770 struct page *p;
771 u64 data_size;
772
773 if (!sev_version_greater_or_equal(0, 15)) {
774 dev_dbg(dev, "DOWNLOAD_FIRMWARE not supported\n");
775 return -1;
776 }
777
778 if (sev_get_firmware(dev, &firmware) == -ENOENT) {
779 dev_dbg(dev, "No SEV firmware file present\n");
780 return -1;
781 }
782
783 /*
784 * SEV FW expects the physical address given to it to be 32
785 * byte aligned. Memory allocated has structure placed at the
786 * beginning followed by the firmware being passed to the SEV
787 * FW. Allocate enough memory for data structure + alignment
788 * padding + SEV FW.
789 */
790 data_size = ALIGN(sizeof(struct sev_data_download_firmware), 32);
791
792 order = get_order(firmware->size + data_size);
793 p = alloc_pages(GFP_KERNEL, order);
794 if (!p) {
795 ret = -1;
796 goto fw_err;
797 }
798
799 /*
800 * Copy firmware data to a kernel allocated contiguous
801 * memory region.
802 */
803 data = page_address(p);
804 memcpy(page_address(p) + data_size, firmware->data, firmware->size);
805
806 data->address = __psp_pa(page_address(p) + data_size);
807 data->len = firmware->size;
808
809 ret = sev_do_cmd(SEV_CMD_DOWNLOAD_FIRMWARE, data, &error);
810
811 /*
812 * A quirk for fixing the committed TCB version, when upgrading from
813 * earlier firmware version than 1.50.
814 */
815 if (!ret && !sev_version_greater_or_equal(1, 50))
816 ret = sev_do_cmd(SEV_CMD_DOWNLOAD_FIRMWARE, data, &error);
817
818 if (ret)
819 dev_dbg(dev, "Failed to update SEV firmware: %#x\n", error);
820 else
821 dev_info(dev, "SEV firmware update successful\n");
822
823 __free_pages(p, order);
824
825 fw_err:
826 release_firmware(firmware);
827
828 return ret;
829 }
830
sev_ioctl_do_pek_import(struct sev_issue_cmd * argp,bool writable)831 static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp, bool writable)
832 {
833 struct sev_device *sev = psp_master->sev_data;
834 struct sev_user_data_pek_cert_import input;
835 struct sev_data_pek_cert_import data;
836 void *pek_blob, *oca_blob;
837 int ret;
838
839 if (!writable)
840 return -EPERM;
841
842 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
843 return -EFAULT;
844
845 /* copy PEK certificate blobs from userspace */
846 pek_blob = psp_copy_user_blob(input.pek_cert_address, input.pek_cert_len);
847 if (IS_ERR(pek_blob))
848 return PTR_ERR(pek_blob);
849
850 data.reserved = 0;
851 data.pek_cert_address = __psp_pa(pek_blob);
852 data.pek_cert_len = input.pek_cert_len;
853
854 /* copy PEK certificate blobs from userspace */
855 oca_blob = psp_copy_user_blob(input.oca_cert_address, input.oca_cert_len);
856 if (IS_ERR(oca_blob)) {
857 ret = PTR_ERR(oca_blob);
858 goto e_free_pek;
859 }
860
861 data.oca_cert_address = __psp_pa(oca_blob);
862 data.oca_cert_len = input.oca_cert_len;
863
864 /* If platform is not in INIT state then transition it to INIT */
865 if (sev->state != SEV_STATE_INIT) {
866 ret = __sev_platform_init_locked(&argp->error);
867 if (ret)
868 goto e_free_oca;
869 }
870
871 ret = __sev_do_cmd_locked(SEV_CMD_PEK_CERT_IMPORT, &data, &argp->error);
872
873 e_free_oca:
874 kfree(oca_blob);
875 e_free_pek:
876 kfree(pek_blob);
877 return ret;
878 }
879
sev_ioctl_do_get_id2(struct sev_issue_cmd * argp)880 static int sev_ioctl_do_get_id2(struct sev_issue_cmd *argp)
881 {
882 struct sev_user_data_get_id2 input;
883 struct sev_data_get_id data;
884 void __user *input_address;
885 void *id_blob = NULL;
886 int ret;
887
888 /* SEV GET_ID is available from SEV API v0.16 and up */
889 if (!sev_version_greater_or_equal(0, 16))
890 return -ENOTSUPP;
891
892 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
893 return -EFAULT;
894
895 input_address = (void __user *)input.address;
896
897 if (input.address && input.length) {
898 /*
899 * The length of the ID shouldn't be assumed by software since
900 * it may change in the future. The allocation size is limited
901 * to 1 << (PAGE_SHIFT + MAX_ORDER) by the page allocator.
902 * If the allocation fails, simply return ENOMEM rather than
903 * warning in the kernel log.
904 */
905 id_blob = kzalloc(input.length, GFP_KERNEL | __GFP_NOWARN);
906 if (!id_blob)
907 return -ENOMEM;
908
909 data.address = __psp_pa(id_blob);
910 data.len = input.length;
911 } else {
912 data.address = 0;
913 data.len = 0;
914 }
915
916 ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, &data, &argp->error);
917
918 /*
919 * Firmware will return the length of the ID value (either the minimum
920 * required length or the actual length written), return it to the user.
921 */
922 input.length = data.len;
923
924 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
925 ret = -EFAULT;
926 goto e_free;
927 }
928
929 if (id_blob) {
930 if (copy_to_user(input_address, id_blob, data.len)) {
931 ret = -EFAULT;
932 goto e_free;
933 }
934 }
935
936 e_free:
937 kfree(id_blob);
938
939 return ret;
940 }
941
sev_ioctl_do_get_id(struct sev_issue_cmd * argp)942 static int sev_ioctl_do_get_id(struct sev_issue_cmd *argp)
943 {
944 struct sev_data_get_id *data;
945 u64 data_size, user_size;
946 void *id_blob, *mem;
947 int ret;
948
949 /* SEV GET_ID available from SEV API v0.16 and up */
950 if (!sev_version_greater_or_equal(0, 16))
951 return -ENOTSUPP;
952
953 /* SEV FW expects the buffer it fills with the ID to be
954 * 8-byte aligned. Memory allocated should be enough to
955 * hold data structure + alignment padding + memory
956 * where SEV FW writes the ID.
957 */
958 data_size = ALIGN(sizeof(struct sev_data_get_id), 8);
959 user_size = sizeof(struct sev_user_data_get_id);
960
961 mem = kzalloc(data_size + user_size, GFP_KERNEL);
962 if (!mem)
963 return -ENOMEM;
964
965 data = mem;
966 id_blob = mem + data_size;
967
968 data->address = __psp_pa(id_blob);
969 data->len = user_size;
970
971 ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error);
972 if (!ret) {
973 if (copy_to_user((void __user *)argp->data, id_blob, data->len))
974 ret = -EFAULT;
975 }
976
977 kfree(mem);
978
979 return ret;
980 }
981
sev_ioctl_do_pdh_export(struct sev_issue_cmd * argp,bool writable)982 static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp, bool writable)
983 {
984 struct sev_device *sev = psp_master->sev_data;
985 struct sev_user_data_pdh_cert_export input;
986 void *pdh_blob = NULL, *cert_blob = NULL;
987 struct sev_data_pdh_cert_export data;
988 void __user *input_cert_chain_address;
989 void __user *input_pdh_cert_address;
990 int ret;
991
992 /* If platform is not in INIT state then transition it to INIT. */
993 if (sev->state != SEV_STATE_INIT) {
994 if (!writable)
995 return -EPERM;
996
997 ret = __sev_platform_init_locked(&argp->error);
998 if (ret)
999 return ret;
1000 }
1001
1002 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
1003 return -EFAULT;
1004
1005 memset(&data, 0, sizeof(data));
1006
1007 /* Userspace wants to query the certificate length. */
1008 if (!input.pdh_cert_address ||
1009 !input.pdh_cert_len ||
1010 !input.cert_chain_address)
1011 goto cmd;
1012
1013 input_pdh_cert_address = (void __user *)input.pdh_cert_address;
1014 input_cert_chain_address = (void __user *)input.cert_chain_address;
1015
1016 /* Allocate a physically contiguous buffer to store the PDH blob. */
1017 if (input.pdh_cert_len > SEV_FW_BLOB_MAX_SIZE)
1018 return -EFAULT;
1019
1020 /* Allocate a physically contiguous buffer to store the cert chain blob. */
1021 if (input.cert_chain_len > SEV_FW_BLOB_MAX_SIZE)
1022 return -EFAULT;
1023
1024 pdh_blob = kzalloc(input.pdh_cert_len, GFP_KERNEL);
1025 if (!pdh_blob)
1026 return -ENOMEM;
1027
1028 data.pdh_cert_address = __psp_pa(pdh_blob);
1029 data.pdh_cert_len = input.pdh_cert_len;
1030
1031 cert_blob = kzalloc(input.cert_chain_len, GFP_KERNEL);
1032 if (!cert_blob) {
1033 ret = -ENOMEM;
1034 goto e_free_pdh;
1035 }
1036
1037 data.cert_chain_address = __psp_pa(cert_blob);
1038 data.cert_chain_len = input.cert_chain_len;
1039
1040 cmd:
1041 ret = __sev_do_cmd_locked(SEV_CMD_PDH_CERT_EXPORT, &data, &argp->error);
1042
1043 /* If we query the length, FW responded with expected data. */
1044 input.cert_chain_len = data.cert_chain_len;
1045 input.pdh_cert_len = data.pdh_cert_len;
1046
1047 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
1048 ret = -EFAULT;
1049 goto e_free_cert;
1050 }
1051
1052 if (pdh_blob) {
1053 if (copy_to_user(input_pdh_cert_address,
1054 pdh_blob, input.pdh_cert_len)) {
1055 ret = -EFAULT;
1056 goto e_free_cert;
1057 }
1058 }
1059
1060 if (cert_blob) {
1061 if (copy_to_user(input_cert_chain_address,
1062 cert_blob, input.cert_chain_len))
1063 ret = -EFAULT;
1064 }
1065
1066 e_free_cert:
1067 kfree(cert_blob);
1068 e_free_pdh:
1069 kfree(pdh_blob);
1070 return ret;
1071 }
1072
sev_ioctl(struct file * file,unsigned int ioctl,unsigned long arg)1073 static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
1074 {
1075 void __user *argp = (void __user *)arg;
1076 struct sev_issue_cmd input;
1077 int ret = -EFAULT;
1078 bool writable = file->f_mode & FMODE_WRITE;
1079
1080 if (!psp_master || !psp_master->sev_data)
1081 return -ENODEV;
1082
1083 if (ioctl != SEV_ISSUE_CMD)
1084 return -EINVAL;
1085
1086 if (copy_from_user(&input, argp, sizeof(struct sev_issue_cmd)))
1087 return -EFAULT;
1088
1089 if (input.cmd > SEV_MAX)
1090 return -EINVAL;
1091
1092 mutex_lock(&sev_cmd_mutex);
1093
1094 switch (input.cmd) {
1095
1096 case SEV_FACTORY_RESET:
1097 ret = sev_ioctl_do_reset(&input, writable);
1098 break;
1099 case SEV_PLATFORM_STATUS:
1100 ret = sev_ioctl_do_platform_status(&input);
1101 break;
1102 case SEV_PEK_GEN:
1103 ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PEK_GEN, &input, writable);
1104 break;
1105 case SEV_PDH_GEN:
1106 ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PDH_GEN, &input, writable);
1107 break;
1108 case SEV_PEK_CSR:
1109 ret = sev_ioctl_do_pek_csr(&input, writable);
1110 break;
1111 case SEV_PEK_CERT_IMPORT:
1112 ret = sev_ioctl_do_pek_import(&input, writable);
1113 break;
1114 case SEV_PDH_CERT_EXPORT:
1115 ret = sev_ioctl_do_pdh_export(&input, writable);
1116 break;
1117 case SEV_GET_ID:
1118 pr_warn_once("SEV_GET_ID command is deprecated, use SEV_GET_ID2\n");
1119 ret = sev_ioctl_do_get_id(&input);
1120 break;
1121 case SEV_GET_ID2:
1122 ret = sev_ioctl_do_get_id2(&input);
1123 break;
1124 default:
1125 ret = -EINVAL;
1126 goto out;
1127 }
1128
1129 if (copy_to_user(argp, &input, sizeof(struct sev_issue_cmd)))
1130 ret = -EFAULT;
1131 out:
1132 mutex_unlock(&sev_cmd_mutex);
1133
1134 return ret;
1135 }
1136
1137 static const struct file_operations sev_fops = {
1138 .owner = THIS_MODULE,
1139 .unlocked_ioctl = sev_ioctl,
1140 };
1141
sev_platform_status(struct sev_user_data_status * data,int * error)1142 int sev_platform_status(struct sev_user_data_status *data, int *error)
1143 {
1144 return sev_do_cmd(SEV_CMD_PLATFORM_STATUS, data, error);
1145 }
1146 EXPORT_SYMBOL_GPL(sev_platform_status);
1147
sev_guest_deactivate(struct sev_data_deactivate * data,int * error)1148 int sev_guest_deactivate(struct sev_data_deactivate *data, int *error)
1149 {
1150 return sev_do_cmd(SEV_CMD_DEACTIVATE, data, error);
1151 }
1152 EXPORT_SYMBOL_GPL(sev_guest_deactivate);
1153
sev_guest_activate(struct sev_data_activate * data,int * error)1154 int sev_guest_activate(struct sev_data_activate *data, int *error)
1155 {
1156 return sev_do_cmd(SEV_CMD_ACTIVATE, data, error);
1157 }
1158 EXPORT_SYMBOL_GPL(sev_guest_activate);
1159
sev_guest_decommission(struct sev_data_decommission * data,int * error)1160 int sev_guest_decommission(struct sev_data_decommission *data, int *error)
1161 {
1162 return sev_do_cmd(SEV_CMD_DECOMMISSION, data, error);
1163 }
1164 EXPORT_SYMBOL_GPL(sev_guest_decommission);
1165
sev_guest_df_flush(int * error)1166 int sev_guest_df_flush(int *error)
1167 {
1168 return sev_do_cmd(SEV_CMD_DF_FLUSH, NULL, error);
1169 }
1170 EXPORT_SYMBOL_GPL(sev_guest_df_flush);
1171
sev_exit(struct kref * ref)1172 static void sev_exit(struct kref *ref)
1173 {
1174 misc_deregister(&misc_dev->misc);
1175 kfree(misc_dev);
1176 misc_dev = NULL;
1177 }
1178
sev_misc_init(struct sev_device * sev)1179 static int sev_misc_init(struct sev_device *sev)
1180 {
1181 struct device *dev = sev->dev;
1182 int ret;
1183
1184 /*
1185 * SEV feature support can be detected on multiple devices but the SEV
1186 * FW commands must be issued on the master. During probe, we do not
1187 * know the master hence we create /dev/sev on the first device probe.
1188 * sev_do_cmd() finds the right master device to which to issue the
1189 * command to the firmware.
1190 */
1191 if (!misc_dev) {
1192 struct miscdevice *misc;
1193
1194 misc_dev = kzalloc(sizeof(*misc_dev), GFP_KERNEL);
1195 if (!misc_dev)
1196 return -ENOMEM;
1197
1198 misc = &misc_dev->misc;
1199 misc->minor = MISC_DYNAMIC_MINOR;
1200 misc->name = DEVICE_NAME;
1201 misc->fops = &sev_fops;
1202
1203 ret = misc_register(misc);
1204 if (ret)
1205 return ret;
1206
1207 kref_init(&misc_dev->refcount);
1208 } else {
1209 kref_get(&misc_dev->refcount);
1210 }
1211
1212 init_waitqueue_head(&sev->int_queue);
1213 sev->misc = misc_dev;
1214 dev_dbg(dev, "registered SEV device\n");
1215
1216 return 0;
1217 }
1218
sev_dev_init(struct psp_device * psp)1219 int sev_dev_init(struct psp_device *psp)
1220 {
1221 struct device *dev = psp->dev;
1222 struct sev_device *sev;
1223 int ret = -ENOMEM;
1224
1225 if (!boot_cpu_has(X86_FEATURE_SEV)) {
1226 dev_info_once(dev, "SEV: memory encryption not enabled by BIOS\n");
1227 return 0;
1228 }
1229
1230 sev = devm_kzalloc(dev, sizeof(*sev), GFP_KERNEL);
1231 if (!sev)
1232 goto e_err;
1233
1234 sev->cmd_buf = (void *)devm_get_free_pages(dev, GFP_KERNEL, 0);
1235 if (!sev->cmd_buf)
1236 goto e_sev;
1237
1238 psp->sev_data = sev;
1239
1240 sev->dev = dev;
1241 sev->psp = psp;
1242
1243 sev->io_regs = psp->io_regs;
1244
1245 sev->vdata = (struct sev_vdata *)psp->vdata->sev;
1246 if (!sev->vdata) {
1247 ret = -ENODEV;
1248 dev_err(dev, "sev: missing driver data\n");
1249 goto e_buf;
1250 }
1251
1252 psp_set_sev_irq_handler(psp, sev_irq_handler, sev);
1253
1254 ret = sev_misc_init(sev);
1255 if (ret)
1256 goto e_irq;
1257
1258 dev_notice(dev, "sev enabled\n");
1259
1260 return 0;
1261
1262 e_irq:
1263 psp_clear_sev_irq_handler(psp);
1264 e_buf:
1265 devm_free_pages(dev, (unsigned long)sev->cmd_buf);
1266 e_sev:
1267 devm_kfree(dev, sev);
1268 e_err:
1269 psp->sev_data = NULL;
1270
1271 dev_notice(dev, "sev initialization failed\n");
1272
1273 return ret;
1274 }
1275
sev_firmware_shutdown(struct sev_device * sev)1276 static void sev_firmware_shutdown(struct sev_device *sev)
1277 {
1278 sev_platform_shutdown(NULL);
1279
1280 if (sev_es_tmr) {
1281 /* The TMR area was encrypted, flush it from the cache */
1282 wbinvd_on_all_cpus();
1283
1284 free_pages((unsigned long)sev_es_tmr,
1285 get_order(SEV_ES_TMR_SIZE));
1286 sev_es_tmr = NULL;
1287 }
1288
1289 if (sev_init_ex_buffer) {
1290 free_pages((unsigned long)sev_init_ex_buffer,
1291 get_order(NV_LENGTH));
1292 sev_init_ex_buffer = NULL;
1293 }
1294 }
1295
sev_dev_destroy(struct psp_device * psp)1296 void sev_dev_destroy(struct psp_device *psp)
1297 {
1298 struct sev_device *sev = psp->sev_data;
1299
1300 if (!sev)
1301 return;
1302
1303 sev_firmware_shutdown(sev);
1304
1305 if (sev->misc)
1306 kref_put(&misc_dev->refcount, sev_exit);
1307
1308 psp_clear_sev_irq_handler(psp);
1309 }
1310
sev_issue_cmd_external_user(struct file * filep,unsigned int cmd,void * data,int * error)1311 int sev_issue_cmd_external_user(struct file *filep, unsigned int cmd,
1312 void *data, int *error)
1313 {
1314 if (!filep || filep->f_op != &sev_fops)
1315 return -EBADF;
1316
1317 return sev_do_cmd(cmd, data, error);
1318 }
1319 EXPORT_SYMBOL_GPL(sev_issue_cmd_external_user);
1320
sev_pci_init(void)1321 void sev_pci_init(void)
1322 {
1323 struct sev_device *sev = psp_master->sev_data;
1324 int error, rc;
1325
1326 if (!sev)
1327 return;
1328
1329 psp_timeout = psp_probe_timeout;
1330
1331 if (sev_get_api_version())
1332 goto err;
1333
1334 if (sev_update_firmware(sev->dev) == 0)
1335 sev_get_api_version();
1336
1337 /* If an init_ex_path is provided rely on INIT_EX for PSP initialization
1338 * instead of INIT.
1339 */
1340 if (init_ex_path) {
1341 sev_init_ex_buffer = sev_fw_alloc(NV_LENGTH);
1342 if (!sev_init_ex_buffer) {
1343 dev_err(sev->dev,
1344 "SEV: INIT_EX NV memory allocation failed\n");
1345 goto err;
1346 }
1347 }
1348
1349 /* Obtain the TMR memory area for SEV-ES use */
1350 sev_es_tmr = sev_fw_alloc(SEV_ES_TMR_SIZE);
1351 if (sev_es_tmr)
1352 /* Must flush the cache before giving it to the firmware */
1353 clflush_cache_range(sev_es_tmr, SEV_ES_TMR_SIZE);
1354 else
1355 dev_warn(sev->dev,
1356 "SEV: TMR allocation failed, SEV-ES support unavailable\n");
1357
1358 if (!psp_init_on_probe)
1359 return;
1360
1361 /* Initialize the platform */
1362 rc = sev_platform_init(&error);
1363 if (rc)
1364 dev_err(sev->dev, "SEV: failed to INIT error %#x, rc %d\n",
1365 error, rc);
1366
1367 return;
1368
1369 err:
1370 sev_dev_destroy(psp_master);
1371
1372 psp_master->sev_data = NULL;
1373 }
1374
sev_pci_exit(void)1375 void sev_pci_exit(void)
1376 {
1377 struct sev_device *sev = psp_master->sev_data;
1378
1379 if (!sev)
1380 return;
1381
1382 sev_firmware_shutdown(sev);
1383 }
1384