1 // SPDX-License-Identifier: GPL-2.0-only
3 * AMD Secure Encrypted Virtualization (SEV) interface
5 * Copyright (C) 2016,2019 Advanced Micro Devices, Inc.
7 * Author: Brijesh Singh <brijesh.singh@amd.com>
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>
27 #include <linux/fs_struct.h>
28 #include <linux/psp.h>
31 #include <asm/cacheflush.h>
36 #define DEVICE_NAME "sev"
37 #define SEV_FW_FILE "/*(DEBLOBBED)*/"
38 #define SEV_FW_NAME_SIZE 64
40 static DEFINE_MUTEX(sev_cmd_mutex);
41 static struct sev_misc_dev *misc_dev;
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");
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");
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");
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");
59 /*(DEBLOBBED)*/ /* 1st gen EPYC */
60 /*(DEBLOBBED)*/ /* 2nd gen EPYC */
61 /*(DEBLOBBED)*/ /* 3rd gen EPYC */
62 /*(DEBLOBBED)*/ /* 4th gen EPYC */
65 static int psp_timeout;
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
72 #define SEV_ES_TMR_SIZE (1024 * 1024)
73 static void *sev_es_tmr;
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.
80 #define NV_LENGTH (32 * 1024)
81 static void *sev_init_ex_buffer;
83 static inline bool sev_version_greater_or_equal(u8 maj, u8 min)
85 struct sev_device *sev = psp_master->sev_data;
87 if (sev->api_major > maj)
90 if (sev->api_major == maj && sev->api_minor >= min)
96 static void sev_irq_handler(int irq, void *data, unsigned int status)
98 struct sev_device *sev = data;
101 /* Check if it is command completion: */
102 if (!(status & SEV_CMD_COMPLETE))
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)) {
109 wake_up(&sev->int_queue);
113 static int sev_wait_cmd_ioc(struct sev_device *sev,
114 unsigned int *reg, unsigned int timeout)
118 ret = wait_event_timeout(sev->int_queue,
119 sev->int_rcvd, timeout * HZ);
123 *reg = ioread32(sev->io_regs + sev->vdata->cmdresp_reg);
128 static int sev_cmd_buffer_len(int 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);
167 static void *sev_fw_alloc(unsigned long len)
171 page = alloc_pages(GFP_KERNEL, get_order(len));
175 return page_address(page);
178 static struct file *open_file_as_root(const char *filename, int flags, umode_t mode)
183 const struct cred *old_cred;
185 task_lock(&init_task);
186 get_fs_root(init_task.fs, &root);
187 task_unlock(&init_task);
189 cred = prepare_creds();
191 return ERR_PTR(-ENOMEM);
192 cred->fsuid = GLOBAL_ROOT_UID;
193 old_cred = override_creds(cred);
195 fp = file_open_root(&root, filename, flags, mode);
198 revert_creds(old_cred);
203 static int sev_read_init_ex_file(void)
205 struct sev_device *sev = psp_master->sev_data;
209 lockdep_assert_held(&sev_cmd_mutex);
211 if (!sev_init_ex_buffer)
214 fp = open_file_as_root(init_ex_path, O_RDONLY, 0);
216 int ret = PTR_ERR(fp);
218 if (ret == -ENOENT) {
220 "SEV: %s does not exist and will be created later.\n",
225 "SEV: could not open %s for read, error %d\n",
231 nread = kernel_read(fp, sev_init_ex_buffer, NV_LENGTH, NULL);
232 if (nread != NV_LENGTH) {
234 "SEV: could not read %u bytes to non volatile memory area, ret %ld\n",
238 dev_dbg(sev->dev, "SEV: read %ld bytes from NV file\n", nread);
239 filp_close(fp, NULL);
244 static int sev_write_init_ex_file(void)
246 struct sev_device *sev = psp_master->sev_data;
251 lockdep_assert_held(&sev_cmd_mutex);
253 if (!sev_init_ex_buffer)
256 fp = open_file_as_root(init_ex_path, O_CREAT | O_WRONLY, 0600);
258 int ret = PTR_ERR(fp);
261 "SEV: could not open file for write, error %d\n",
266 nwrite = kernel_write(fp, sev_init_ex_buffer, NV_LENGTH, &offset);
268 filp_close(fp, NULL);
270 if (nwrite != NV_LENGTH) {
272 "SEV: failed to write %u bytes to non volatile memory area, ret %ld\n",
277 dev_dbg(sev->dev, "SEV: write successful to NV file\n");
282 static int sev_write_init_ex_file_if_required(int cmd_id)
284 lockdep_assert_held(&sev_cmd_mutex);
286 if (!sev_init_ex_buffer)
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.
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:
305 return sev_write_init_ex_file();
308 static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret)
310 struct psp_device *psp = psp_master;
311 struct sev_device *sev;
312 unsigned int cmdbuff_hi, cmdbuff_lo;
313 unsigned int phys_lsb, phys_msb;
314 unsigned int reg, ret = 0;
317 if (!psp || !psp->sev_data)
325 buf_len = sev_cmd_buffer_len(cmd);
326 if (WARN_ON_ONCE(!data != !buf_len))
330 * Copy the incoming data to driver's scratch buffer as __pa() will not
331 * work for some memory, e.g. vmalloc'd addresses, and @data may not be
332 * physically contiguous.
335 memcpy(sev->cmd_buf, data, buf_len);
337 /* Get the physical address of the command buffer */
338 phys_lsb = data ? lower_32_bits(__psp_pa(sev->cmd_buf)) : 0;
339 phys_msb = data ? upper_32_bits(__psp_pa(sev->cmd_buf)) : 0;
341 dev_dbg(sev->dev, "sev command id %#x buffer 0x%08x%08x timeout %us\n",
342 cmd, phys_msb, phys_lsb, psp_timeout);
344 print_hex_dump_debug("(in): ", DUMP_PREFIX_OFFSET, 16, 2, data,
347 iowrite32(phys_lsb, sev->io_regs + sev->vdata->cmdbuff_addr_lo_reg);
348 iowrite32(phys_msb, sev->io_regs + sev->vdata->cmdbuff_addr_hi_reg);
352 reg = FIELD_PREP(SEV_CMDRESP_CMD, cmd) | SEV_CMDRESP_IOC;
353 iowrite32(reg, sev->io_regs + sev->vdata->cmdresp_reg);
355 /* wait for command completion */
356 ret = sev_wait_cmd_ioc(sev, ®, psp_timeout);
361 dev_err(sev->dev, "sev command %#x timed out, disabling PSP\n", cmd);
367 psp_timeout = psp_cmd_timeout;
370 *psp_ret = FIELD_GET(PSP_CMDRESP_STS, reg);
372 if (FIELD_GET(PSP_CMDRESP_STS, reg)) {
373 dev_dbg(sev->dev, "sev command %#x failed (%#010lx)\n",
374 cmd, FIELD_GET(PSP_CMDRESP_STS, reg));
377 * PSP firmware may report additional error information in the
378 * command buffer registers on error. Print contents of command
379 * buffer registers if they changed.
381 cmdbuff_hi = ioread32(sev->io_regs + sev->vdata->cmdbuff_addr_hi_reg);
382 cmdbuff_lo = ioread32(sev->io_regs + sev->vdata->cmdbuff_addr_lo_reg);
383 if (cmdbuff_hi != phys_msb || cmdbuff_lo != phys_lsb) {
384 dev_dbg(sev->dev, "Additional error information reported in cmdbuff:");
385 dev_dbg(sev->dev, " cmdbuff hi: %#010x\n", cmdbuff_hi);
386 dev_dbg(sev->dev, " cmdbuff lo: %#010x\n", cmdbuff_lo);
390 ret = sev_write_init_ex_file_if_required(cmd);
393 print_hex_dump_debug("(out): ", DUMP_PREFIX_OFFSET, 16, 2, data,
397 * Copy potential output from the PSP back to data. Do this even on
398 * failure in case the caller wants to glean something from the error.
401 memcpy(data, sev->cmd_buf, buf_len);
406 static int sev_do_cmd(int cmd, void *data, int *psp_ret)
410 mutex_lock(&sev_cmd_mutex);
411 rc = __sev_do_cmd_locked(cmd, data, psp_ret);
412 mutex_unlock(&sev_cmd_mutex);
417 static int __sev_init_locked(int *error)
419 struct sev_data_init data;
421 memset(&data, 0, sizeof(data));
424 * Do not include the encryption mask on the physical
425 * address of the TMR (firmware should clear it anyway).
427 data.tmr_address = __pa(sev_es_tmr);
429 data.flags |= SEV_INIT_FLAGS_SEV_ES;
430 data.tmr_len = SEV_ES_TMR_SIZE;
433 return __sev_do_cmd_locked(SEV_CMD_INIT, &data, error);
436 static int __sev_init_ex_locked(int *error)
438 struct sev_data_init_ex data;
440 memset(&data, 0, sizeof(data));
441 data.length = sizeof(data);
442 data.nv_address = __psp_pa(sev_init_ex_buffer);
443 data.nv_len = NV_LENGTH;
447 * Do not include the encryption mask on the physical
448 * address of the TMR (firmware should clear it anyway).
450 data.tmr_address = __pa(sev_es_tmr);
452 data.flags |= SEV_INIT_FLAGS_SEV_ES;
453 data.tmr_len = SEV_ES_TMR_SIZE;
456 return __sev_do_cmd_locked(SEV_CMD_INIT_EX, &data, error);
459 static inline int __sev_do_init_locked(int *psp_ret)
461 if (sev_init_ex_buffer)
462 return __sev_init_ex_locked(psp_ret);
464 return __sev_init_locked(psp_ret);
467 static int __sev_platform_init_locked(int *error)
469 int rc = 0, psp_ret = SEV_RET_NO_FW_CALL;
470 struct psp_device *psp = psp_master;
471 struct sev_device *sev;
473 if (!psp || !psp->sev_data)
478 if (sev->state == SEV_STATE_INIT)
481 if (sev_init_ex_buffer) {
482 rc = sev_read_init_ex_file();
487 rc = __sev_do_init_locked(&psp_ret);
488 if (rc && psp_ret == SEV_RET_SECURE_DATA_INVALID) {
490 * Initialization command returned an integrity check failure
491 * status code, meaning that firmware load and validation of SEV
492 * related persistent data has failed. Retrying the
493 * initialization function should succeed by replacing the state
494 * with a reset state.
497 "SEV: retrying INIT command because of SECURE_DATA_INVALID error. Retrying once to reset PSP SEV state.");
498 rc = __sev_do_init_locked(&psp_ret);
507 sev->state = SEV_STATE_INIT;
509 /* Prepare for first SEV guest launch after INIT */
510 wbinvd_on_all_cpus();
511 rc = __sev_do_cmd_locked(SEV_CMD_DF_FLUSH, NULL, error);
515 dev_dbg(sev->dev, "SEV firmware initialized\n");
517 dev_info(sev->dev, "SEV API:%d.%d build:%d\n", sev->api_major,
518 sev->api_minor, sev->build);
523 int sev_platform_init(int *error)
527 mutex_lock(&sev_cmd_mutex);
528 rc = __sev_platform_init_locked(error);
529 mutex_unlock(&sev_cmd_mutex);
533 EXPORT_SYMBOL_GPL(sev_platform_init);
535 static int __sev_platform_shutdown_locked(int *error)
537 struct psp_device *psp = psp_master;
538 struct sev_device *sev;
541 if (!psp || !psp->sev_data)
546 if (sev->state == SEV_STATE_UNINIT)
549 ret = __sev_do_cmd_locked(SEV_CMD_SHUTDOWN, NULL, error);
553 sev->state = SEV_STATE_UNINIT;
554 dev_dbg(sev->dev, "SEV firmware shutdown\n");
559 static int sev_platform_shutdown(int *error)
563 mutex_lock(&sev_cmd_mutex);
564 rc = __sev_platform_shutdown_locked(NULL);
565 mutex_unlock(&sev_cmd_mutex);
570 static int sev_get_platform_state(int *state, int *error)
572 struct sev_user_data_status data;
575 rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, &data, error);
583 static int sev_ioctl_do_reset(struct sev_issue_cmd *argp, bool writable)
591 * The SEV spec requires that FACTORY_RESET must be issued in
592 * UNINIT state. Before we go further lets check if any guest is
595 * If FW is in WORKING state then deny the request otherwise issue
596 * SHUTDOWN command do INIT -> UNINIT before issuing the FACTORY_RESET.
599 rc = sev_get_platform_state(&state, &argp->error);
603 if (state == SEV_STATE_WORKING)
606 if (state == SEV_STATE_INIT) {
607 rc = __sev_platform_shutdown_locked(&argp->error);
612 return __sev_do_cmd_locked(SEV_CMD_FACTORY_RESET, NULL, &argp->error);
615 static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp)
617 struct sev_user_data_status data;
620 memset(&data, 0, sizeof(data));
622 ret = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, &data, &argp->error);
626 if (copy_to_user((void __user *)argp->data, &data, sizeof(data)))
632 static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp, bool writable)
634 struct sev_device *sev = psp_master->sev_data;
640 if (sev->state == SEV_STATE_UNINIT) {
641 rc = __sev_platform_init_locked(&argp->error);
646 return __sev_do_cmd_locked(cmd, NULL, &argp->error);
649 static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp, bool writable)
651 struct sev_device *sev = psp_master->sev_data;
652 struct sev_user_data_pek_csr input;
653 struct sev_data_pek_csr data;
654 void __user *input_address;
661 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
664 memset(&data, 0, sizeof(data));
666 /* userspace wants to query CSR length */
667 if (!input.address || !input.length)
670 /* allocate a physically contiguous buffer to store the CSR blob */
671 input_address = (void __user *)input.address;
672 if (input.length > SEV_FW_BLOB_MAX_SIZE)
675 blob = kzalloc(input.length, GFP_KERNEL);
679 data.address = __psp_pa(blob);
680 data.len = input.length;
683 if (sev->state == SEV_STATE_UNINIT) {
684 ret = __sev_platform_init_locked(&argp->error);
689 ret = __sev_do_cmd_locked(SEV_CMD_PEK_CSR, &data, &argp->error);
691 /* If we query the CSR length, FW responded with expected data. */
692 input.length = data.len;
694 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
700 if (copy_to_user(input_address, blob, input.length))
709 void *psp_copy_user_blob(u64 uaddr, u32 len)
712 return ERR_PTR(-EINVAL);
714 /* verify that blob length does not exceed our limit */
715 if (len > SEV_FW_BLOB_MAX_SIZE)
716 return ERR_PTR(-EINVAL);
718 return memdup_user((void __user *)uaddr, len);
720 EXPORT_SYMBOL_GPL(psp_copy_user_blob);
722 static int sev_get_api_version(void)
724 struct sev_device *sev = psp_master->sev_data;
725 struct sev_user_data_status status;
728 ret = sev_platform_status(&status, &error);
731 "SEV: failed to get status. Error: %#x\n", error);
735 sev->api_major = status.api_major;
736 sev->api_minor = status.api_minor;
737 sev->build = status.build;
738 sev->state = status.state;
743 static int sev_get_firmware(struct device *dev,
744 const struct firmware **firmware)
746 char fw_name_specific[SEV_FW_NAME_SIZE];
747 char fw_name_subset[SEV_FW_NAME_SIZE];
749 snprintf(fw_name_specific, sizeof(fw_name_specific),
750 "amd/amd_sev_fam%.2xh_model%.2xh.sbin",
751 boot_cpu_data.x86, boot_cpu_data.x86_model);
753 snprintf(fw_name_subset, sizeof(fw_name_subset),
754 "amd/amd_sev_fam%.2xh_model%.1xxh.sbin",
755 boot_cpu_data.x86, (boot_cpu_data.x86_model & 0xf0) >> 4);
757 /* Check for SEV FW for a particular model.
758 * Ex. amd_sev_fam17h_model00h.sbin for Family 17h Model 00h
762 * Check for SEV FW common to a subset of models.
763 * Ex. amd_sev_fam17h_model0xh.sbin for
764 * Family 17h Model 00h -- Family 17h Model 0Fh
768 * Fall-back to using generic name: sev.fw
770 if ((firmware_reject_nowarn(firmware, fw_name_specific, dev) >= 0) ||
771 (firmware_reject_nowarn(firmware, fw_name_subset, dev) >= 0) ||
772 (firmware_reject_nowarn(firmware, SEV_FW_FILE, dev) >= 0))
778 /* Don't fail if SEV FW couldn't be updated. Continue with existing SEV FW */
779 static int sev_update_firmware(struct device *dev)
781 struct sev_data_download_firmware *data;
782 const struct firmware *firmware;
783 int ret, error, order;
787 if (!sev_version_greater_or_equal(0, 15)) {
788 dev_dbg(dev, "DOWNLOAD_FIRMWARE not supported\n");
792 if (sev_get_firmware(dev, &firmware) == -ENOENT) {
793 dev_dbg(dev, "No SEV firmware file present\n");
798 * SEV FW expects the physical address given to it to be 32
799 * byte aligned. Memory allocated has structure placed at the
800 * beginning followed by the firmware being passed to the SEV
801 * FW. Allocate enough memory for data structure + alignment
804 data_size = ALIGN(sizeof(struct sev_data_download_firmware), 32);
806 order = get_order(firmware->size + data_size);
807 p = alloc_pages(GFP_KERNEL, order);
814 * Copy firmware data to a kernel allocated contiguous
817 data = page_address(p);
818 memcpy(page_address(p) + data_size, firmware->data, firmware->size);
820 data->address = __psp_pa(page_address(p) + data_size);
821 data->len = firmware->size;
823 ret = sev_do_cmd(SEV_CMD_DOWNLOAD_FIRMWARE, data, &error);
826 * A quirk for fixing the committed TCB version, when upgrading from
827 * earlier firmware version than 1.50.
829 if (!ret && !sev_version_greater_or_equal(1, 50))
830 ret = sev_do_cmd(SEV_CMD_DOWNLOAD_FIRMWARE, data, &error);
833 dev_dbg(dev, "Failed to update SEV firmware: %#x\n", error);
835 dev_info(dev, "SEV firmware update successful\n");
837 __free_pages(p, order);
840 release_firmware(firmware);
845 static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp, bool writable)
847 struct sev_device *sev = psp_master->sev_data;
848 struct sev_user_data_pek_cert_import input;
849 struct sev_data_pek_cert_import data;
850 void *pek_blob, *oca_blob;
856 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
859 /* copy PEK certificate blobs from userspace */
860 pek_blob = psp_copy_user_blob(input.pek_cert_address, input.pek_cert_len);
861 if (IS_ERR(pek_blob))
862 return PTR_ERR(pek_blob);
865 data.pek_cert_address = __psp_pa(pek_blob);
866 data.pek_cert_len = input.pek_cert_len;
868 /* copy PEK certificate blobs from userspace */
869 oca_blob = psp_copy_user_blob(input.oca_cert_address, input.oca_cert_len);
870 if (IS_ERR(oca_blob)) {
871 ret = PTR_ERR(oca_blob);
875 data.oca_cert_address = __psp_pa(oca_blob);
876 data.oca_cert_len = input.oca_cert_len;
878 /* If platform is not in INIT state then transition it to INIT */
879 if (sev->state != SEV_STATE_INIT) {
880 ret = __sev_platform_init_locked(&argp->error);
885 ret = __sev_do_cmd_locked(SEV_CMD_PEK_CERT_IMPORT, &data, &argp->error);
894 static int sev_ioctl_do_get_id2(struct sev_issue_cmd *argp)
896 struct sev_user_data_get_id2 input;
897 struct sev_data_get_id data;
898 void __user *input_address;
899 void *id_blob = NULL;
902 /* SEV GET_ID is available from SEV API v0.16 and up */
903 if (!sev_version_greater_or_equal(0, 16))
906 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
909 input_address = (void __user *)input.address;
911 if (input.address && input.length) {
913 * The length of the ID shouldn't be assumed by software since
914 * it may change in the future. The allocation size is limited
915 * to 1 << (PAGE_SHIFT + MAX_PAGE_ORDER) by the page allocator.
916 * If the allocation fails, simply return ENOMEM rather than
917 * warning in the kernel log.
919 id_blob = kzalloc(input.length, GFP_KERNEL | __GFP_NOWARN);
923 data.address = __psp_pa(id_blob);
924 data.len = input.length;
930 ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, &data, &argp->error);
933 * Firmware will return the length of the ID value (either the minimum
934 * required length or the actual length written), return it to the user.
936 input.length = data.len;
938 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
944 if (copy_to_user(input_address, id_blob, data.len)) {
956 static int sev_ioctl_do_get_id(struct sev_issue_cmd *argp)
958 struct sev_data_get_id *data;
959 u64 data_size, user_size;
963 /* SEV GET_ID available from SEV API v0.16 and up */
964 if (!sev_version_greater_or_equal(0, 16))
967 /* SEV FW expects the buffer it fills with the ID to be
968 * 8-byte aligned. Memory allocated should be enough to
969 * hold data structure + alignment padding + memory
970 * where SEV FW writes the ID.
972 data_size = ALIGN(sizeof(struct sev_data_get_id), 8);
973 user_size = sizeof(struct sev_user_data_get_id);
975 mem = kzalloc(data_size + user_size, GFP_KERNEL);
980 id_blob = mem + data_size;
982 data->address = __psp_pa(id_blob);
983 data->len = user_size;
985 ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error);
987 if (copy_to_user((void __user *)argp->data, id_blob, data->len))
996 static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp, bool writable)
998 struct sev_device *sev = psp_master->sev_data;
999 struct sev_user_data_pdh_cert_export input;
1000 void *pdh_blob = NULL, *cert_blob = NULL;
1001 struct sev_data_pdh_cert_export data;
1002 void __user *input_cert_chain_address;
1003 void __user *input_pdh_cert_address;
1006 /* If platform is not in INIT state then transition it to INIT. */
1007 if (sev->state != SEV_STATE_INIT) {
1011 ret = __sev_platform_init_locked(&argp->error);
1016 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
1019 memset(&data, 0, sizeof(data));
1021 /* Userspace wants to query the certificate length. */
1022 if (!input.pdh_cert_address ||
1023 !input.pdh_cert_len ||
1024 !input.cert_chain_address)
1027 input_pdh_cert_address = (void __user *)input.pdh_cert_address;
1028 input_cert_chain_address = (void __user *)input.cert_chain_address;
1030 /* Allocate a physically contiguous buffer to store the PDH blob. */
1031 if (input.pdh_cert_len > SEV_FW_BLOB_MAX_SIZE)
1034 /* Allocate a physically contiguous buffer to store the cert chain blob. */
1035 if (input.cert_chain_len > SEV_FW_BLOB_MAX_SIZE)
1038 pdh_blob = kzalloc(input.pdh_cert_len, GFP_KERNEL);
1042 data.pdh_cert_address = __psp_pa(pdh_blob);
1043 data.pdh_cert_len = input.pdh_cert_len;
1045 cert_blob = kzalloc(input.cert_chain_len, GFP_KERNEL);
1051 data.cert_chain_address = __psp_pa(cert_blob);
1052 data.cert_chain_len = input.cert_chain_len;
1055 ret = __sev_do_cmd_locked(SEV_CMD_PDH_CERT_EXPORT, &data, &argp->error);
1057 /* If we query the length, FW responded with expected data. */
1058 input.cert_chain_len = data.cert_chain_len;
1059 input.pdh_cert_len = data.pdh_cert_len;
1061 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
1067 if (copy_to_user(input_pdh_cert_address,
1068 pdh_blob, input.pdh_cert_len)) {
1075 if (copy_to_user(input_cert_chain_address,
1076 cert_blob, input.cert_chain_len))
1087 static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
1089 void __user *argp = (void __user *)arg;
1090 struct sev_issue_cmd input;
1092 bool writable = file->f_mode & FMODE_WRITE;
1094 if (!psp_master || !psp_master->sev_data)
1097 if (ioctl != SEV_ISSUE_CMD)
1100 if (copy_from_user(&input, argp, sizeof(struct sev_issue_cmd)))
1103 if (input.cmd > SEV_MAX)
1106 mutex_lock(&sev_cmd_mutex);
1108 switch (input.cmd) {
1110 case SEV_FACTORY_RESET:
1111 ret = sev_ioctl_do_reset(&input, writable);
1113 case SEV_PLATFORM_STATUS:
1114 ret = sev_ioctl_do_platform_status(&input);
1117 ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PEK_GEN, &input, writable);
1120 ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PDH_GEN, &input, writable);
1123 ret = sev_ioctl_do_pek_csr(&input, writable);
1125 case SEV_PEK_CERT_IMPORT:
1126 ret = sev_ioctl_do_pek_import(&input, writable);
1128 case SEV_PDH_CERT_EXPORT:
1129 ret = sev_ioctl_do_pdh_export(&input, writable);
1132 pr_warn_once("SEV_GET_ID command is deprecated, use SEV_GET_ID2\n");
1133 ret = sev_ioctl_do_get_id(&input);
1136 ret = sev_ioctl_do_get_id2(&input);
1143 if (copy_to_user(argp, &input, sizeof(struct sev_issue_cmd)))
1146 mutex_unlock(&sev_cmd_mutex);
1151 static const struct file_operations sev_fops = {
1152 .owner = THIS_MODULE,
1153 .unlocked_ioctl = sev_ioctl,
1156 int sev_platform_status(struct sev_user_data_status *data, int *error)
1158 return sev_do_cmd(SEV_CMD_PLATFORM_STATUS, data, error);
1160 EXPORT_SYMBOL_GPL(sev_platform_status);
1162 int sev_guest_deactivate(struct sev_data_deactivate *data, int *error)
1164 return sev_do_cmd(SEV_CMD_DEACTIVATE, data, error);
1166 EXPORT_SYMBOL_GPL(sev_guest_deactivate);
1168 int sev_guest_activate(struct sev_data_activate *data, int *error)
1170 return sev_do_cmd(SEV_CMD_ACTIVATE, data, error);
1172 EXPORT_SYMBOL_GPL(sev_guest_activate);
1174 int sev_guest_decommission(struct sev_data_decommission *data, int *error)
1176 return sev_do_cmd(SEV_CMD_DECOMMISSION, data, error);
1178 EXPORT_SYMBOL_GPL(sev_guest_decommission);
1180 int sev_guest_df_flush(int *error)
1182 return sev_do_cmd(SEV_CMD_DF_FLUSH, NULL, error);
1184 EXPORT_SYMBOL_GPL(sev_guest_df_flush);
1186 static void sev_exit(struct kref *ref)
1188 misc_deregister(&misc_dev->misc);
1193 static int sev_misc_init(struct sev_device *sev)
1195 struct device *dev = sev->dev;
1199 * SEV feature support can be detected on multiple devices but the SEV
1200 * FW commands must be issued on the master. During probe, we do not
1201 * know the master hence we create /dev/sev on the first device probe.
1202 * sev_do_cmd() finds the right master device to which to issue the
1203 * command to the firmware.
1206 struct miscdevice *misc;
1208 misc_dev = kzalloc(sizeof(*misc_dev), GFP_KERNEL);
1212 misc = &misc_dev->misc;
1213 misc->minor = MISC_DYNAMIC_MINOR;
1214 misc->name = DEVICE_NAME;
1215 misc->fops = &sev_fops;
1217 ret = misc_register(misc);
1221 kref_init(&misc_dev->refcount);
1223 kref_get(&misc_dev->refcount);
1226 init_waitqueue_head(&sev->int_queue);
1227 sev->misc = misc_dev;
1228 dev_dbg(dev, "registered SEV device\n");
1233 int sev_dev_init(struct psp_device *psp)
1235 struct device *dev = psp->dev;
1236 struct sev_device *sev;
1239 if (!boot_cpu_has(X86_FEATURE_SEV)) {
1240 dev_info_once(dev, "SEV: memory encryption not enabled by BIOS\n");
1244 sev = devm_kzalloc(dev, sizeof(*sev), GFP_KERNEL);
1248 sev->cmd_buf = (void *)devm_get_free_pages(dev, GFP_KERNEL, 0);
1252 psp->sev_data = sev;
1257 sev->io_regs = psp->io_regs;
1259 sev->vdata = (struct sev_vdata *)psp->vdata->sev;
1262 dev_err(dev, "sev: missing driver data\n");
1266 psp_set_sev_irq_handler(psp, sev_irq_handler, sev);
1268 ret = sev_misc_init(sev);
1272 dev_notice(dev, "sev enabled\n");
1277 psp_clear_sev_irq_handler(psp);
1279 devm_free_pages(dev, (unsigned long)sev->cmd_buf);
1281 devm_kfree(dev, sev);
1283 psp->sev_data = NULL;
1285 dev_notice(dev, "sev initialization failed\n");
1290 static void sev_firmware_shutdown(struct sev_device *sev)
1292 sev_platform_shutdown(NULL);
1295 /* The TMR area was encrypted, flush it from the cache */
1296 wbinvd_on_all_cpus();
1298 free_pages((unsigned long)sev_es_tmr,
1299 get_order(SEV_ES_TMR_SIZE));
1303 if (sev_init_ex_buffer) {
1304 free_pages((unsigned long)sev_init_ex_buffer,
1305 get_order(NV_LENGTH));
1306 sev_init_ex_buffer = NULL;
1310 void sev_dev_destroy(struct psp_device *psp)
1312 struct sev_device *sev = psp->sev_data;
1317 sev_firmware_shutdown(sev);
1320 kref_put(&misc_dev->refcount, sev_exit);
1322 psp_clear_sev_irq_handler(psp);
1325 int sev_issue_cmd_external_user(struct file *filep, unsigned int cmd,
1326 void *data, int *error)
1328 if (!filep || filep->f_op != &sev_fops)
1331 return sev_do_cmd(cmd, data, error);
1333 EXPORT_SYMBOL_GPL(sev_issue_cmd_external_user);
1335 void sev_pci_init(void)
1337 struct sev_device *sev = psp_master->sev_data;
1343 psp_timeout = psp_probe_timeout;
1345 if (sev_get_api_version())
1348 if (sev_update_firmware(sev->dev) == 0)
1349 sev_get_api_version();
1351 /* If an init_ex_path is provided rely on INIT_EX for PSP initialization
1355 sev_init_ex_buffer = sev_fw_alloc(NV_LENGTH);
1356 if (!sev_init_ex_buffer) {
1358 "SEV: INIT_EX NV memory allocation failed\n");
1363 /* Obtain the TMR memory area for SEV-ES use */
1364 sev_es_tmr = sev_fw_alloc(SEV_ES_TMR_SIZE);
1366 /* Must flush the cache before giving it to the firmware */
1367 clflush_cache_range(sev_es_tmr, SEV_ES_TMR_SIZE);
1370 "SEV: TMR allocation failed, SEV-ES support unavailable\n");
1372 if (!psp_init_on_probe)
1375 /* Initialize the platform */
1376 rc = sev_platform_init(&error);
1378 dev_err(sev->dev, "SEV: failed to INIT error %#x, rc %d\n",
1384 psp_master->sev_data = NULL;
1387 void sev_pci_exit(void)
1389 struct sev_device *sev = psp_master->sev_data;
1394 sev_firmware_shutdown(sev);