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/module.h>
11 #include <linux/kernel.h>
12 #include <linux/kthread.h>
13 #include <linux/sched.h>
14 #include <linux/interrupt.h>
15 #include <linux/spinlock.h>
16 #include <linux/spinlock_types.h>
17 #include <linux/types.h>
18 #include <linux/mutex.h>
19 #include <linux/delay.h>
20 #include <linux/hw_random.h>
21 #include <linux/ccp.h>
22 #include <linux/firmware.h>
23 #include <linux/gfp.h>
24 #include <linux/cpufeature.h>
32 #define DEVICE_NAME "sev"
33 #define SEV_FW_FILE "amd/sev.fw"
34 #define SEV_FW_NAME_SIZE 64
36 static DEFINE_MUTEX(sev_cmd_mutex);
37 static struct sev_misc_dev *misc_dev;
39 static int psp_cmd_timeout = 100;
40 module_param(psp_cmd_timeout, int, 0644);
41 MODULE_PARM_DESC(psp_cmd_timeout, " default timeout value, in seconds, for PSP commands");
43 static int psp_probe_timeout = 5;
44 module_param(psp_probe_timeout, int, 0644);
45 MODULE_PARM_DESC(psp_probe_timeout, " default timeout value, in seconds, during PSP device probe");
47 static char *init_ex_path;
48 module_param(init_ex_path, charp, 0444);
49 MODULE_PARM_DESC(init_ex_path, " Path for INIT_EX data; if set try INIT_EX");
51 static bool psp_init_on_probe = true;
52 module_param(psp_init_on_probe, bool, 0444);
53 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");
55 MODULE_FIRMWARE("amd/amd_sev_fam17h_model0xh.sbin"); /* 1st gen EPYC */
56 MODULE_FIRMWARE("amd/amd_sev_fam17h_model3xh.sbin"); /* 2nd gen EPYC */
57 MODULE_FIRMWARE("amd/amd_sev_fam19h_model0xh.sbin"); /* 3rd gen EPYC */
60 static int psp_timeout;
62 /* Trusted Memory Region (TMR):
63 * The TMR is a 1MB area that must be 1MB aligned. Use the page allocator
64 * to allocate the memory, which will return aligned memory for the specified
67 #define SEV_ES_TMR_SIZE (1024 * 1024)
68 static void *sev_es_tmr;
70 /* INIT_EX NV Storage:
71 * The NV Storage is a 32Kb area and must be 4Kb page aligned. Use the page
72 * allocator to allocate the memory, which will return aligned memory for the
73 * specified allocation order.
75 #define NV_LENGTH (32 * 1024)
76 static void *sev_init_ex_buffer;
78 static inline bool sev_version_greater_or_equal(u8 maj, u8 min)
80 struct sev_device *sev = psp_master->sev_data;
82 if (sev->api_major > maj)
85 if (sev->api_major == maj && sev->api_minor >= min)
91 static void sev_irq_handler(int irq, void *data, unsigned int status)
93 struct sev_device *sev = data;
96 /* Check if it is command completion: */
97 if (!(status & SEV_CMD_COMPLETE))
100 /* Check if it is SEV command completion: */
101 reg = ioread32(sev->io_regs + sev->vdata->cmdresp_reg);
102 if (reg & PSP_CMDRESP_RESP) {
104 wake_up(&sev->int_queue);
108 static int sev_wait_cmd_ioc(struct sev_device *sev,
109 unsigned int *reg, unsigned int timeout)
113 ret = wait_event_timeout(sev->int_queue,
114 sev->int_rcvd, timeout * HZ);
118 *reg = ioread32(sev->io_regs + sev->vdata->cmdresp_reg);
123 static int sev_cmd_buffer_len(int cmd)
126 case SEV_CMD_INIT: return sizeof(struct sev_data_init);
127 case SEV_CMD_INIT_EX: return sizeof(struct sev_data_init_ex);
128 case SEV_CMD_PLATFORM_STATUS: return sizeof(struct sev_user_data_status);
129 case SEV_CMD_PEK_CSR: return sizeof(struct sev_data_pek_csr);
130 case SEV_CMD_PEK_CERT_IMPORT: return sizeof(struct sev_data_pek_cert_import);
131 case SEV_CMD_PDH_CERT_EXPORT: return sizeof(struct sev_data_pdh_cert_export);
132 case SEV_CMD_LAUNCH_START: return sizeof(struct sev_data_launch_start);
133 case SEV_CMD_LAUNCH_UPDATE_DATA: return sizeof(struct sev_data_launch_update_data);
134 case SEV_CMD_LAUNCH_UPDATE_VMSA: return sizeof(struct sev_data_launch_update_vmsa);
135 case SEV_CMD_LAUNCH_FINISH: return sizeof(struct sev_data_launch_finish);
136 case SEV_CMD_LAUNCH_MEASURE: return sizeof(struct sev_data_launch_measure);
137 case SEV_CMD_ACTIVATE: return sizeof(struct sev_data_activate);
138 case SEV_CMD_DEACTIVATE: return sizeof(struct sev_data_deactivate);
139 case SEV_CMD_DECOMMISSION: return sizeof(struct sev_data_decommission);
140 case SEV_CMD_GUEST_STATUS: return sizeof(struct sev_data_guest_status);
141 case SEV_CMD_DBG_DECRYPT: return sizeof(struct sev_data_dbg);
142 case SEV_CMD_DBG_ENCRYPT: return sizeof(struct sev_data_dbg);
143 case SEV_CMD_SEND_START: return sizeof(struct sev_data_send_start);
144 case SEV_CMD_SEND_UPDATE_DATA: return sizeof(struct sev_data_send_update_data);
145 case SEV_CMD_SEND_UPDATE_VMSA: return sizeof(struct sev_data_send_update_vmsa);
146 case SEV_CMD_SEND_FINISH: return sizeof(struct sev_data_send_finish);
147 case SEV_CMD_RECEIVE_START: return sizeof(struct sev_data_receive_start);
148 case SEV_CMD_RECEIVE_FINISH: return sizeof(struct sev_data_receive_finish);
149 case SEV_CMD_RECEIVE_UPDATE_DATA: return sizeof(struct sev_data_receive_update_data);
150 case SEV_CMD_RECEIVE_UPDATE_VMSA: return sizeof(struct sev_data_receive_update_vmsa);
151 case SEV_CMD_LAUNCH_UPDATE_SECRET: return sizeof(struct sev_data_launch_secret);
152 case SEV_CMD_DOWNLOAD_FIRMWARE: return sizeof(struct sev_data_download_firmware);
153 case SEV_CMD_GET_ID: return sizeof(struct sev_data_get_id);
154 case SEV_CMD_ATTESTATION_REPORT: return sizeof(struct sev_data_attestation_report);
155 case SEV_CMD_SEND_CANCEL: return sizeof(struct sev_data_send_cancel);
162 static void *sev_fw_alloc(unsigned long len)
166 page = alloc_pages(GFP_KERNEL, get_order(len));
170 return page_address(page);
173 static int sev_read_init_ex_file(void)
175 struct sev_device *sev = psp_master->sev_data;
179 lockdep_assert_held(&sev_cmd_mutex);
181 if (!sev_init_ex_buffer)
184 fp = filp_open(init_ex_path, O_RDONLY, 0);
186 int ret = PTR_ERR(fp);
189 "SEV: could not open %s for read, error %d\n",
194 nread = kernel_read(fp, sev_init_ex_buffer, NV_LENGTH, NULL);
195 if (nread != NV_LENGTH) {
197 "SEV: failed to read %u bytes to non volatile memory area, ret %ld\n",
202 dev_dbg(sev->dev, "SEV: read %ld bytes from NV file\n", nread);
203 filp_close(fp, NULL);
208 static void sev_write_init_ex_file(void)
210 struct sev_device *sev = psp_master->sev_data;
215 lockdep_assert_held(&sev_cmd_mutex);
217 if (!sev_init_ex_buffer)
220 fp = filp_open(init_ex_path, O_CREAT | O_WRONLY, 0600);
223 "SEV: could not open file for write, error %ld\n",
228 nwrite = kernel_write(fp, sev_init_ex_buffer, NV_LENGTH, &offset);
230 filp_close(fp, NULL);
232 if (nwrite != NV_LENGTH) {
234 "SEV: failed to write %u bytes to non volatile memory area, ret %ld\n",
239 dev_dbg(sev->dev, "SEV: write successful to NV file\n");
242 static void sev_write_init_ex_file_if_required(int cmd_id)
244 lockdep_assert_held(&sev_cmd_mutex);
246 if (!sev_init_ex_buffer)
250 * Only a few platform commands modify the SPI/NV area, but none of the
251 * non-platform commands do. Only INIT(_EX), PLATFORM_RESET, PEK_GEN,
252 * PEK_CERT_IMPORT, and PDH_GEN do.
255 case SEV_CMD_FACTORY_RESET:
256 case SEV_CMD_INIT_EX:
257 case SEV_CMD_PDH_GEN:
258 case SEV_CMD_PEK_CERT_IMPORT:
259 case SEV_CMD_PEK_GEN:
265 sev_write_init_ex_file();
268 static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret)
270 struct psp_device *psp = psp_master;
271 struct sev_device *sev;
272 unsigned int phys_lsb, phys_msb;
273 unsigned int reg, ret = 0;
276 if (!psp || !psp->sev_data)
284 buf_len = sev_cmd_buffer_len(cmd);
285 if (WARN_ON_ONCE(!data != !buf_len))
289 * Copy the incoming data to driver's scratch buffer as __pa() will not
290 * work for some memory, e.g. vmalloc'd addresses, and @data may not be
291 * physically contiguous.
294 memcpy(sev->cmd_buf, data, buf_len);
296 /* Get the physical address of the command buffer */
297 phys_lsb = data ? lower_32_bits(__psp_pa(sev->cmd_buf)) : 0;
298 phys_msb = data ? upper_32_bits(__psp_pa(sev->cmd_buf)) : 0;
300 dev_dbg(sev->dev, "sev command id %#x buffer 0x%08x%08x timeout %us\n",
301 cmd, phys_msb, phys_lsb, psp_timeout);
303 print_hex_dump_debug("(in): ", DUMP_PREFIX_OFFSET, 16, 2, data,
306 iowrite32(phys_lsb, sev->io_regs + sev->vdata->cmdbuff_addr_lo_reg);
307 iowrite32(phys_msb, sev->io_regs + sev->vdata->cmdbuff_addr_hi_reg);
312 reg <<= SEV_CMDRESP_CMD_SHIFT;
313 reg |= SEV_CMDRESP_IOC;
314 iowrite32(reg, sev->io_regs + sev->vdata->cmdresp_reg);
316 /* wait for command completion */
317 ret = sev_wait_cmd_ioc(sev, ®, psp_timeout);
322 dev_err(sev->dev, "sev command %#x timed out, disabling PSP\n", cmd);
328 psp_timeout = psp_cmd_timeout;
331 *psp_ret = reg & PSP_CMDRESP_ERR_MASK;
333 if (reg & PSP_CMDRESP_ERR_MASK) {
334 dev_dbg(sev->dev, "sev command %#x failed (%#010x)\n",
335 cmd, reg & PSP_CMDRESP_ERR_MASK);
338 sev_write_init_ex_file_if_required(cmd);
341 print_hex_dump_debug("(out): ", DUMP_PREFIX_OFFSET, 16, 2, data,
345 * Copy potential output from the PSP back to data. Do this even on
346 * failure in case the caller wants to glean something from the error.
349 memcpy(data, sev->cmd_buf, buf_len);
354 static int sev_do_cmd(int cmd, void *data, int *psp_ret)
358 mutex_lock(&sev_cmd_mutex);
359 rc = __sev_do_cmd_locked(cmd, data, psp_ret);
360 mutex_unlock(&sev_cmd_mutex);
365 static int __sev_init_locked(int *error)
367 struct sev_data_init data;
369 memset(&data, 0, sizeof(data));
372 * Do not include the encryption mask on the physical
373 * address of the TMR (firmware should clear it anyway).
375 data.tmr_address = __pa(sev_es_tmr);
377 data.flags |= SEV_INIT_FLAGS_SEV_ES;
378 data.tmr_len = SEV_ES_TMR_SIZE;
381 return __sev_do_cmd_locked(SEV_CMD_INIT, &data, error);
384 static int __sev_init_ex_locked(int *error)
386 struct sev_data_init_ex data;
389 memset(&data, 0, sizeof(data));
390 data.length = sizeof(data);
391 data.nv_address = __psp_pa(sev_init_ex_buffer);
392 data.nv_len = NV_LENGTH;
394 ret = sev_read_init_ex_file();
400 * Do not include the encryption mask on the physical
401 * address of the TMR (firmware should clear it anyway).
403 data.tmr_address = __pa(sev_es_tmr);
405 data.flags |= SEV_INIT_FLAGS_SEV_ES;
406 data.tmr_len = SEV_ES_TMR_SIZE;
409 return __sev_do_cmd_locked(SEV_CMD_INIT_EX, &data, error);
412 static int __sev_platform_init_locked(int *error)
414 struct psp_device *psp = psp_master;
415 struct sev_device *sev;
416 int rc, psp_ret = -1;
417 int (*init_function)(int *error);
419 if (!psp || !psp->sev_data)
424 if (sev->state == SEV_STATE_INIT)
427 init_function = sev_init_ex_buffer ? __sev_init_ex_locked :
429 rc = init_function(&psp_ret);
430 if (rc && psp_ret == SEV_RET_SECURE_DATA_INVALID) {
432 * Initialization command returned an integrity check failure
433 * status code, meaning that firmware load and validation of SEV
434 * related persistent data has failed. Retrying the
435 * initialization function should succeed by replacing the state
436 * with a reset state.
438 dev_dbg(sev->dev, "SEV: retrying INIT command");
439 rc = init_function(&psp_ret);
447 sev->state = SEV_STATE_INIT;
449 /* Prepare for first SEV guest launch after INIT */
450 wbinvd_on_all_cpus();
451 rc = __sev_do_cmd_locked(SEV_CMD_DF_FLUSH, NULL, error);
455 dev_dbg(sev->dev, "SEV firmware initialized\n");
457 dev_info(sev->dev, "SEV API:%d.%d build:%d\n", sev->api_major,
458 sev->api_minor, sev->build);
463 int sev_platform_init(int *error)
467 mutex_lock(&sev_cmd_mutex);
468 rc = __sev_platform_init_locked(error);
469 mutex_unlock(&sev_cmd_mutex);
473 EXPORT_SYMBOL_GPL(sev_platform_init);
475 static int __sev_platform_shutdown_locked(int *error)
477 struct sev_device *sev = psp_master->sev_data;
480 if (sev->state == SEV_STATE_UNINIT)
483 ret = __sev_do_cmd_locked(SEV_CMD_SHUTDOWN, NULL, error);
487 sev->state = SEV_STATE_UNINIT;
488 dev_dbg(sev->dev, "SEV firmware shutdown\n");
493 static int sev_platform_shutdown(int *error)
497 mutex_lock(&sev_cmd_mutex);
498 rc = __sev_platform_shutdown_locked(NULL);
499 mutex_unlock(&sev_cmd_mutex);
504 static int sev_get_platform_state(int *state, int *error)
506 struct sev_user_data_status data;
509 rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, &data, error);
517 static int sev_ioctl_do_reset(struct sev_issue_cmd *argp, bool writable)
525 * The SEV spec requires that FACTORY_RESET must be issued in
526 * UNINIT state. Before we go further lets check if any guest is
529 * If FW is in WORKING state then deny the request otherwise issue
530 * SHUTDOWN command do INIT -> UNINIT before issuing the FACTORY_RESET.
533 rc = sev_get_platform_state(&state, &argp->error);
537 if (state == SEV_STATE_WORKING)
540 if (state == SEV_STATE_INIT) {
541 rc = __sev_platform_shutdown_locked(&argp->error);
546 return __sev_do_cmd_locked(SEV_CMD_FACTORY_RESET, NULL, &argp->error);
549 static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp)
551 struct sev_user_data_status data;
554 ret = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, &data, &argp->error);
558 if (copy_to_user((void __user *)argp->data, &data, sizeof(data)))
564 static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp, bool writable)
566 struct sev_device *sev = psp_master->sev_data;
572 if (sev->state == SEV_STATE_UNINIT) {
573 rc = __sev_platform_init_locked(&argp->error);
578 return __sev_do_cmd_locked(cmd, NULL, &argp->error);
581 static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp, bool writable)
583 struct sev_device *sev = psp_master->sev_data;
584 struct sev_user_data_pek_csr input;
585 struct sev_data_pek_csr data;
586 void __user *input_address;
593 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
596 memset(&data, 0, sizeof(data));
598 /* userspace wants to query CSR length */
599 if (!input.address || !input.length)
602 /* allocate a physically contiguous buffer to store the CSR blob */
603 input_address = (void __user *)input.address;
604 if (input.length > SEV_FW_BLOB_MAX_SIZE)
607 blob = kmalloc(input.length, GFP_KERNEL);
611 data.address = __psp_pa(blob);
612 data.len = input.length;
615 if (sev->state == SEV_STATE_UNINIT) {
616 ret = __sev_platform_init_locked(&argp->error);
621 ret = __sev_do_cmd_locked(SEV_CMD_PEK_CSR, &data, &argp->error);
623 /* If we query the CSR length, FW responded with expected data. */
624 input.length = data.len;
626 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
632 if (copy_to_user(input_address, blob, input.length))
641 void *psp_copy_user_blob(u64 uaddr, u32 len)
644 return ERR_PTR(-EINVAL);
646 /* verify that blob length does not exceed our limit */
647 if (len > SEV_FW_BLOB_MAX_SIZE)
648 return ERR_PTR(-EINVAL);
650 return memdup_user((void __user *)uaddr, len);
652 EXPORT_SYMBOL_GPL(psp_copy_user_blob);
654 static int sev_get_api_version(void)
656 struct sev_device *sev = psp_master->sev_data;
657 struct sev_user_data_status status;
660 ret = sev_platform_status(&status, &error);
663 "SEV: failed to get status. Error: %#x\n", error);
667 sev->api_major = status.api_major;
668 sev->api_minor = status.api_minor;
669 sev->build = status.build;
670 sev->state = status.state;
675 static int sev_get_firmware(struct device *dev,
676 const struct firmware **firmware)
678 char fw_name_specific[SEV_FW_NAME_SIZE];
679 char fw_name_subset[SEV_FW_NAME_SIZE];
681 snprintf(fw_name_specific, sizeof(fw_name_specific),
682 "amd/amd_sev_fam%.2xh_model%.2xh.sbin",
683 boot_cpu_data.x86, boot_cpu_data.x86_model);
685 snprintf(fw_name_subset, sizeof(fw_name_subset),
686 "amd/amd_sev_fam%.2xh_model%.1xxh.sbin",
687 boot_cpu_data.x86, (boot_cpu_data.x86_model & 0xf0) >> 4);
689 /* Check for SEV FW for a particular model.
690 * Ex. amd_sev_fam17h_model00h.sbin for Family 17h Model 00h
694 * Check for SEV FW common to a subset of models.
695 * Ex. amd_sev_fam17h_model0xh.sbin for
696 * Family 17h Model 00h -- Family 17h Model 0Fh
700 * Fall-back to using generic name: sev.fw
702 if ((firmware_request_nowarn(firmware, fw_name_specific, dev) >= 0) ||
703 (firmware_request_nowarn(firmware, fw_name_subset, dev) >= 0) ||
704 (firmware_request_nowarn(firmware, SEV_FW_FILE, dev) >= 0))
710 /* Don't fail if SEV FW couldn't be updated. Continue with existing SEV FW */
711 static int sev_update_firmware(struct device *dev)
713 struct sev_data_download_firmware *data;
714 const struct firmware *firmware;
715 int ret, error, order;
719 if (sev_get_firmware(dev, &firmware) == -ENOENT) {
720 dev_dbg(dev, "No SEV firmware file present\n");
725 * SEV FW expects the physical address given to it to be 32
726 * byte aligned. Memory allocated has structure placed at the
727 * beginning followed by the firmware being passed to the SEV
728 * FW. Allocate enough memory for data structure + alignment
731 data_size = ALIGN(sizeof(struct sev_data_download_firmware), 32);
733 order = get_order(firmware->size + data_size);
734 p = alloc_pages(GFP_KERNEL, order);
741 * Copy firmware data to a kernel allocated contiguous
744 data = page_address(p);
745 memcpy(page_address(p) + data_size, firmware->data, firmware->size);
747 data->address = __psp_pa(page_address(p) + data_size);
748 data->len = firmware->size;
750 ret = sev_do_cmd(SEV_CMD_DOWNLOAD_FIRMWARE, data, &error);
752 dev_dbg(dev, "Failed to update SEV firmware: %#x\n", error);
754 dev_info(dev, "SEV firmware update successful\n");
756 __free_pages(p, order);
759 release_firmware(firmware);
764 static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp, bool writable)
766 struct sev_device *sev = psp_master->sev_data;
767 struct sev_user_data_pek_cert_import input;
768 struct sev_data_pek_cert_import data;
769 void *pek_blob, *oca_blob;
775 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
778 /* copy PEK certificate blobs from userspace */
779 pek_blob = psp_copy_user_blob(input.pek_cert_address, input.pek_cert_len);
780 if (IS_ERR(pek_blob))
781 return PTR_ERR(pek_blob);
784 data.pek_cert_address = __psp_pa(pek_blob);
785 data.pek_cert_len = input.pek_cert_len;
787 /* copy PEK certificate blobs from userspace */
788 oca_blob = psp_copy_user_blob(input.oca_cert_address, input.oca_cert_len);
789 if (IS_ERR(oca_blob)) {
790 ret = PTR_ERR(oca_blob);
794 data.oca_cert_address = __psp_pa(oca_blob);
795 data.oca_cert_len = input.oca_cert_len;
797 /* If platform is not in INIT state then transition it to INIT */
798 if (sev->state != SEV_STATE_INIT) {
799 ret = __sev_platform_init_locked(&argp->error);
804 ret = __sev_do_cmd_locked(SEV_CMD_PEK_CERT_IMPORT, &data, &argp->error);
813 static int sev_ioctl_do_get_id2(struct sev_issue_cmd *argp)
815 struct sev_user_data_get_id2 input;
816 struct sev_data_get_id data;
817 void __user *input_address;
818 void *id_blob = NULL;
821 /* SEV GET_ID is available from SEV API v0.16 and up */
822 if (!sev_version_greater_or_equal(0, 16))
825 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
828 input_address = (void __user *)input.address;
830 if (input.address && input.length) {
831 id_blob = kmalloc(input.length, GFP_KERNEL);
835 data.address = __psp_pa(id_blob);
836 data.len = input.length;
842 ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, &data, &argp->error);
845 * Firmware will return the length of the ID value (either the minimum
846 * required length or the actual length written), return it to the user.
848 input.length = data.len;
850 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
856 if (copy_to_user(input_address, id_blob, data.len)) {
868 static int sev_ioctl_do_get_id(struct sev_issue_cmd *argp)
870 struct sev_data_get_id *data;
871 u64 data_size, user_size;
875 /* SEV GET_ID available from SEV API v0.16 and up */
876 if (!sev_version_greater_or_equal(0, 16))
879 /* SEV FW expects the buffer it fills with the ID to be
880 * 8-byte aligned. Memory allocated should be enough to
881 * hold data structure + alignment padding + memory
882 * where SEV FW writes the ID.
884 data_size = ALIGN(sizeof(struct sev_data_get_id), 8);
885 user_size = sizeof(struct sev_user_data_get_id);
887 mem = kzalloc(data_size + user_size, GFP_KERNEL);
892 id_blob = mem + data_size;
894 data->address = __psp_pa(id_blob);
895 data->len = user_size;
897 ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error);
899 if (copy_to_user((void __user *)argp->data, id_blob, data->len))
908 static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp, bool writable)
910 struct sev_device *sev = psp_master->sev_data;
911 struct sev_user_data_pdh_cert_export input;
912 void *pdh_blob = NULL, *cert_blob = NULL;
913 struct sev_data_pdh_cert_export data;
914 void __user *input_cert_chain_address;
915 void __user *input_pdh_cert_address;
918 /* If platform is not in INIT state then transition it to INIT. */
919 if (sev->state != SEV_STATE_INIT) {
923 ret = __sev_platform_init_locked(&argp->error);
928 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
931 memset(&data, 0, sizeof(data));
933 /* Userspace wants to query the certificate length. */
934 if (!input.pdh_cert_address ||
935 !input.pdh_cert_len ||
936 !input.cert_chain_address)
939 input_pdh_cert_address = (void __user *)input.pdh_cert_address;
940 input_cert_chain_address = (void __user *)input.cert_chain_address;
942 /* Allocate a physically contiguous buffer to store the PDH blob. */
943 if (input.pdh_cert_len > SEV_FW_BLOB_MAX_SIZE)
946 /* Allocate a physically contiguous buffer to store the cert chain blob. */
947 if (input.cert_chain_len > SEV_FW_BLOB_MAX_SIZE)
950 pdh_blob = kmalloc(input.pdh_cert_len, GFP_KERNEL);
954 data.pdh_cert_address = __psp_pa(pdh_blob);
955 data.pdh_cert_len = input.pdh_cert_len;
957 cert_blob = kmalloc(input.cert_chain_len, GFP_KERNEL);
963 data.cert_chain_address = __psp_pa(cert_blob);
964 data.cert_chain_len = input.cert_chain_len;
967 ret = __sev_do_cmd_locked(SEV_CMD_PDH_CERT_EXPORT, &data, &argp->error);
969 /* If we query the length, FW responded with expected data. */
970 input.cert_chain_len = data.cert_chain_len;
971 input.pdh_cert_len = data.pdh_cert_len;
973 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
979 if (copy_to_user(input_pdh_cert_address,
980 pdh_blob, input.pdh_cert_len)) {
987 if (copy_to_user(input_cert_chain_address,
988 cert_blob, input.cert_chain_len))
999 static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
1001 void __user *argp = (void __user *)arg;
1002 struct sev_issue_cmd input;
1004 bool writable = file->f_mode & FMODE_WRITE;
1006 if (!psp_master || !psp_master->sev_data)
1009 if (ioctl != SEV_ISSUE_CMD)
1012 if (copy_from_user(&input, argp, sizeof(struct sev_issue_cmd)))
1015 if (input.cmd > SEV_MAX)
1018 mutex_lock(&sev_cmd_mutex);
1020 switch (input.cmd) {
1022 case SEV_FACTORY_RESET:
1023 ret = sev_ioctl_do_reset(&input, writable);
1025 case SEV_PLATFORM_STATUS:
1026 ret = sev_ioctl_do_platform_status(&input);
1029 ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PEK_GEN, &input, writable);
1032 ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PDH_GEN, &input, writable);
1035 ret = sev_ioctl_do_pek_csr(&input, writable);
1037 case SEV_PEK_CERT_IMPORT:
1038 ret = sev_ioctl_do_pek_import(&input, writable);
1040 case SEV_PDH_CERT_EXPORT:
1041 ret = sev_ioctl_do_pdh_export(&input, writable);
1044 pr_warn_once("SEV_GET_ID command is deprecated, use SEV_GET_ID2\n");
1045 ret = sev_ioctl_do_get_id(&input);
1048 ret = sev_ioctl_do_get_id2(&input);
1055 if (copy_to_user(argp, &input, sizeof(struct sev_issue_cmd)))
1058 mutex_unlock(&sev_cmd_mutex);
1063 static const struct file_operations sev_fops = {
1064 .owner = THIS_MODULE,
1065 .unlocked_ioctl = sev_ioctl,
1068 int sev_platform_status(struct sev_user_data_status *data, int *error)
1070 return sev_do_cmd(SEV_CMD_PLATFORM_STATUS, data, error);
1072 EXPORT_SYMBOL_GPL(sev_platform_status);
1074 int sev_guest_deactivate(struct sev_data_deactivate *data, int *error)
1076 return sev_do_cmd(SEV_CMD_DEACTIVATE, data, error);
1078 EXPORT_SYMBOL_GPL(sev_guest_deactivate);
1080 int sev_guest_activate(struct sev_data_activate *data, int *error)
1082 return sev_do_cmd(SEV_CMD_ACTIVATE, data, error);
1084 EXPORT_SYMBOL_GPL(sev_guest_activate);
1086 int sev_guest_decommission(struct sev_data_decommission *data, int *error)
1088 return sev_do_cmd(SEV_CMD_DECOMMISSION, data, error);
1090 EXPORT_SYMBOL_GPL(sev_guest_decommission);
1092 int sev_guest_df_flush(int *error)
1094 return sev_do_cmd(SEV_CMD_DF_FLUSH, NULL, error);
1096 EXPORT_SYMBOL_GPL(sev_guest_df_flush);
1098 static void sev_exit(struct kref *ref)
1100 misc_deregister(&misc_dev->misc);
1105 static int sev_misc_init(struct sev_device *sev)
1107 struct device *dev = sev->dev;
1111 * SEV feature support can be detected on multiple devices but the SEV
1112 * FW commands must be issued on the master. During probe, we do not
1113 * know the master hence we create /dev/sev on the first device probe.
1114 * sev_do_cmd() finds the right master device to which to issue the
1115 * command to the firmware.
1118 struct miscdevice *misc;
1120 misc_dev = kzalloc(sizeof(*misc_dev), GFP_KERNEL);
1124 misc = &misc_dev->misc;
1125 misc->minor = MISC_DYNAMIC_MINOR;
1126 misc->name = DEVICE_NAME;
1127 misc->fops = &sev_fops;
1129 ret = misc_register(misc);
1133 kref_init(&misc_dev->refcount);
1135 kref_get(&misc_dev->refcount);
1138 init_waitqueue_head(&sev->int_queue);
1139 sev->misc = misc_dev;
1140 dev_dbg(dev, "registered SEV device\n");
1145 int sev_dev_init(struct psp_device *psp)
1147 struct device *dev = psp->dev;
1148 struct sev_device *sev;
1151 if (!boot_cpu_has(X86_FEATURE_SEV)) {
1152 dev_info_once(dev, "SEV: memory encryption not enabled by BIOS\n");
1156 sev = devm_kzalloc(dev, sizeof(*sev), GFP_KERNEL);
1160 sev->cmd_buf = (void *)devm_get_free_pages(dev, GFP_KERNEL, 0);
1164 psp->sev_data = sev;
1169 sev->io_regs = psp->io_regs;
1171 sev->vdata = (struct sev_vdata *)psp->vdata->sev;
1174 dev_err(dev, "sev: missing driver data\n");
1178 psp_set_sev_irq_handler(psp, sev_irq_handler, sev);
1180 ret = sev_misc_init(sev);
1184 dev_notice(dev, "sev enabled\n");
1189 psp_clear_sev_irq_handler(psp);
1191 devm_free_pages(dev, (unsigned long)sev->cmd_buf);
1193 devm_kfree(dev, sev);
1195 psp->sev_data = NULL;
1197 dev_notice(dev, "sev initialization failed\n");
1202 static void sev_firmware_shutdown(struct sev_device *sev)
1204 sev_platform_shutdown(NULL);
1207 /* The TMR area was encrypted, flush it from the cache */
1208 wbinvd_on_all_cpus();
1210 free_pages((unsigned long)sev_es_tmr,
1211 get_order(SEV_ES_TMR_SIZE));
1215 if (sev_init_ex_buffer) {
1216 free_pages((unsigned long)sev_init_ex_buffer,
1217 get_order(NV_LENGTH));
1218 sev_init_ex_buffer = NULL;
1222 void sev_dev_destroy(struct psp_device *psp)
1224 struct sev_device *sev = psp->sev_data;
1229 sev_firmware_shutdown(sev);
1232 kref_put(&misc_dev->refcount, sev_exit);
1234 psp_clear_sev_irq_handler(psp);
1237 int sev_issue_cmd_external_user(struct file *filep, unsigned int cmd,
1238 void *data, int *error)
1240 if (!filep || filep->f_op != &sev_fops)
1243 return sev_do_cmd(cmd, data, error);
1245 EXPORT_SYMBOL_GPL(sev_issue_cmd_external_user);
1247 void sev_pci_init(void)
1249 struct sev_device *sev = psp_master->sev_data;
1255 psp_timeout = psp_probe_timeout;
1257 if (sev_get_api_version())
1260 if (sev_version_greater_or_equal(0, 15) &&
1261 sev_update_firmware(sev->dev) == 0)
1262 sev_get_api_version();
1264 /* If an init_ex_path is provided rely on INIT_EX for PSP initialization
1268 sev_init_ex_buffer = sev_fw_alloc(NV_LENGTH);
1269 if (!sev_init_ex_buffer) {
1271 "SEV: INIT_EX NV memory allocation failed\n");
1276 /* Obtain the TMR memory area for SEV-ES use */
1277 sev_es_tmr = sev_fw_alloc(SEV_ES_TMR_SIZE);
1280 "SEV: TMR allocation failed, SEV-ES support unavailable\n");
1282 if (!psp_init_on_probe)
1285 /* Initialize the platform */
1286 rc = sev_platform_init(&error);
1288 dev_err(sev->dev, "SEV: failed to INIT error %#x, rc %d\n",
1294 psp_master->sev_data = NULL;
1297 void sev_pci_exit(void)
1299 struct sev_device *sev = psp_master->sev_data;
1304 sev_firmware_shutdown(sev);