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>
31 #define DEVICE_NAME "sev"
32 #define SEV_FW_FILE "amd/sev.fw"
33 #define SEV_FW_NAME_SIZE 64
35 static DEFINE_MUTEX(sev_cmd_mutex);
36 static struct sev_misc_dev *misc_dev;
38 static int psp_cmd_timeout = 100;
39 module_param(psp_cmd_timeout, int, 0644);
40 MODULE_PARM_DESC(psp_cmd_timeout, " default timeout value, in seconds, for PSP commands");
42 static int psp_probe_timeout = 5;
43 module_param(psp_probe_timeout, int, 0644);
44 MODULE_PARM_DESC(psp_probe_timeout, " default timeout value, in seconds, during PSP device probe");
47 static int psp_timeout;
49 /* Trusted Memory Region (TMR):
50 * The TMR is a 1MB area that must be 1MB aligned. Use the page allocator
51 * to allocate the memory, which will return aligned memory for the specified
54 #define SEV_ES_TMR_SIZE (1024 * 1024)
55 static void *sev_es_tmr;
57 static inline bool sev_version_greater_or_equal(u8 maj, u8 min)
59 struct sev_device *sev = psp_master->sev_data;
61 if (sev->api_major > maj)
64 if (sev->api_major == maj && sev->api_minor >= min)
70 static void sev_irq_handler(int irq, void *data, unsigned int status)
72 struct sev_device *sev = data;
75 /* Check if it is command completion: */
76 if (!(status & SEV_CMD_COMPLETE))
79 /* Check if it is SEV command completion: */
80 reg = ioread32(sev->io_regs + sev->vdata->cmdresp_reg);
81 if (reg & PSP_CMDRESP_RESP) {
83 wake_up(&sev->int_queue);
87 static int sev_wait_cmd_ioc(struct sev_device *sev,
88 unsigned int *reg, unsigned int timeout)
92 ret = wait_event_timeout(sev->int_queue,
93 sev->int_rcvd, timeout * HZ);
97 *reg = ioread32(sev->io_regs + sev->vdata->cmdresp_reg);
102 static int sev_cmd_buffer_len(int cmd)
105 case SEV_CMD_INIT: return sizeof(struct sev_data_init);
106 case SEV_CMD_PLATFORM_STATUS: return sizeof(struct sev_user_data_status);
107 case SEV_CMD_PEK_CSR: return sizeof(struct sev_data_pek_csr);
108 case SEV_CMD_PEK_CERT_IMPORT: return sizeof(struct sev_data_pek_cert_import);
109 case SEV_CMD_PDH_CERT_EXPORT: return sizeof(struct sev_data_pdh_cert_export);
110 case SEV_CMD_LAUNCH_START: return sizeof(struct sev_data_launch_start);
111 case SEV_CMD_LAUNCH_UPDATE_DATA: return sizeof(struct sev_data_launch_update_data);
112 case SEV_CMD_LAUNCH_UPDATE_VMSA: return sizeof(struct sev_data_launch_update_vmsa);
113 case SEV_CMD_LAUNCH_FINISH: return sizeof(struct sev_data_launch_finish);
114 case SEV_CMD_LAUNCH_MEASURE: return sizeof(struct sev_data_launch_measure);
115 case SEV_CMD_ACTIVATE: return sizeof(struct sev_data_activate);
116 case SEV_CMD_DEACTIVATE: return sizeof(struct sev_data_deactivate);
117 case SEV_CMD_DECOMMISSION: return sizeof(struct sev_data_decommission);
118 case SEV_CMD_GUEST_STATUS: return sizeof(struct sev_data_guest_status);
119 case SEV_CMD_DBG_DECRYPT: return sizeof(struct sev_data_dbg);
120 case SEV_CMD_DBG_ENCRYPT: return sizeof(struct sev_data_dbg);
121 case SEV_CMD_SEND_START: return sizeof(struct sev_data_send_start);
122 case SEV_CMD_SEND_UPDATE_DATA: return sizeof(struct sev_data_send_update_data);
123 case SEV_CMD_SEND_UPDATE_VMSA: return sizeof(struct sev_data_send_update_vmsa);
124 case SEV_CMD_SEND_FINISH: return sizeof(struct sev_data_send_finish);
125 case SEV_CMD_RECEIVE_START: return sizeof(struct sev_data_receive_start);
126 case SEV_CMD_RECEIVE_FINISH: return sizeof(struct sev_data_receive_finish);
127 case SEV_CMD_RECEIVE_UPDATE_DATA: return sizeof(struct sev_data_receive_update_data);
128 case SEV_CMD_RECEIVE_UPDATE_VMSA: return sizeof(struct sev_data_receive_update_vmsa);
129 case SEV_CMD_LAUNCH_UPDATE_SECRET: return sizeof(struct sev_data_launch_secret);
130 case SEV_CMD_DOWNLOAD_FIRMWARE: return sizeof(struct sev_data_download_firmware);
131 case SEV_CMD_GET_ID: return sizeof(struct sev_data_get_id);
132 case SEV_CMD_ATTESTATION_REPORT: return sizeof(struct sev_data_attestation_report);
133 case SEV_CMD_SEND_CANCEL: return sizeof(struct sev_data_send_cancel);
140 static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret)
142 struct psp_device *psp = psp_master;
143 struct sev_device *sev;
144 unsigned int phys_lsb, phys_msb;
145 unsigned int reg, ret = 0;
148 if (!psp || !psp->sev_data)
156 buf_len = sev_cmd_buffer_len(cmd);
157 if (WARN_ON_ONCE(!data != !buf_len))
161 * Copy the incoming data to driver's scratch buffer as __pa() will not
162 * work for some memory, e.g. vmalloc'd addresses, and @data may not be
163 * physically contiguous.
166 memcpy(sev->cmd_buf, data, buf_len);
168 /* Get the physical address of the command buffer */
169 phys_lsb = data ? lower_32_bits(__psp_pa(sev->cmd_buf)) : 0;
170 phys_msb = data ? upper_32_bits(__psp_pa(sev->cmd_buf)) : 0;
172 dev_dbg(sev->dev, "sev command id %#x buffer 0x%08x%08x timeout %us\n",
173 cmd, phys_msb, phys_lsb, psp_timeout);
175 print_hex_dump_debug("(in): ", DUMP_PREFIX_OFFSET, 16, 2, data,
178 iowrite32(phys_lsb, sev->io_regs + sev->vdata->cmdbuff_addr_lo_reg);
179 iowrite32(phys_msb, sev->io_regs + sev->vdata->cmdbuff_addr_hi_reg);
184 reg <<= SEV_CMDRESP_CMD_SHIFT;
185 reg |= SEV_CMDRESP_IOC;
186 iowrite32(reg, sev->io_regs + sev->vdata->cmdresp_reg);
188 /* wait for command completion */
189 ret = sev_wait_cmd_ioc(sev, ®, psp_timeout);
194 dev_err(sev->dev, "sev command %#x timed out, disabling PSP\n", cmd);
200 psp_timeout = psp_cmd_timeout;
203 *psp_ret = reg & PSP_CMDRESP_ERR_MASK;
205 if (reg & PSP_CMDRESP_ERR_MASK) {
206 dev_dbg(sev->dev, "sev command %#x failed (%#010x)\n",
207 cmd, reg & PSP_CMDRESP_ERR_MASK);
211 print_hex_dump_debug("(out): ", DUMP_PREFIX_OFFSET, 16, 2, data,
215 * Copy potential output from the PSP back to data. Do this even on
216 * failure in case the caller wants to glean something from the error.
219 memcpy(data, sev->cmd_buf, buf_len);
224 static int sev_do_cmd(int cmd, void *data, int *psp_ret)
228 mutex_lock(&sev_cmd_mutex);
229 rc = __sev_do_cmd_locked(cmd, data, psp_ret);
230 mutex_unlock(&sev_cmd_mutex);
235 static int __sev_platform_init_locked(int *error)
237 struct psp_device *psp = psp_master;
238 struct sev_data_init data;
239 struct sev_device *sev;
242 if (!psp || !psp->sev_data)
247 if (sev->state == SEV_STATE_INIT)
250 memset(&data, 0, sizeof(data));
255 * Do not include the encryption mask on the physical
256 * address of the TMR (firmware should clear it anyway).
258 tmr_pa = __pa(sev_es_tmr);
260 data.flags |= SEV_INIT_FLAGS_SEV_ES;
261 data.tmr_address = tmr_pa;
262 data.tmr_len = SEV_ES_TMR_SIZE;
265 rc = __sev_do_cmd_locked(SEV_CMD_INIT, &data, error);
269 sev->state = SEV_STATE_INIT;
271 /* Prepare for first SEV guest launch after INIT */
272 wbinvd_on_all_cpus();
273 rc = __sev_do_cmd_locked(SEV_CMD_DF_FLUSH, NULL, error);
277 dev_dbg(sev->dev, "SEV firmware initialized\n");
282 int sev_platform_init(int *error)
286 mutex_lock(&sev_cmd_mutex);
287 rc = __sev_platform_init_locked(error);
288 mutex_unlock(&sev_cmd_mutex);
292 EXPORT_SYMBOL_GPL(sev_platform_init);
294 static int __sev_platform_shutdown_locked(int *error)
296 struct sev_device *sev = psp_master->sev_data;
299 ret = __sev_do_cmd_locked(SEV_CMD_SHUTDOWN, NULL, error);
303 sev->state = SEV_STATE_UNINIT;
304 dev_dbg(sev->dev, "SEV firmware shutdown\n");
309 static int sev_platform_shutdown(int *error)
313 mutex_lock(&sev_cmd_mutex);
314 rc = __sev_platform_shutdown_locked(NULL);
315 mutex_unlock(&sev_cmd_mutex);
320 static int sev_get_platform_state(int *state, int *error)
322 struct sev_user_data_status data;
325 rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, &data, error);
333 static int sev_ioctl_do_reset(struct sev_issue_cmd *argp, bool writable)
341 * The SEV spec requires that FACTORY_RESET must be issued in
342 * UNINIT state. Before we go further lets check if any guest is
345 * If FW is in WORKING state then deny the request otherwise issue
346 * SHUTDOWN command do INIT -> UNINIT before issuing the FACTORY_RESET.
349 rc = sev_get_platform_state(&state, &argp->error);
353 if (state == SEV_STATE_WORKING)
356 if (state == SEV_STATE_INIT) {
357 rc = __sev_platform_shutdown_locked(&argp->error);
362 return __sev_do_cmd_locked(SEV_CMD_FACTORY_RESET, NULL, &argp->error);
365 static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp)
367 struct sev_user_data_status data;
370 ret = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, &data, &argp->error);
374 if (copy_to_user((void __user *)argp->data, &data, sizeof(data)))
380 static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp, bool writable)
382 struct sev_device *sev = psp_master->sev_data;
388 if (sev->state == SEV_STATE_UNINIT) {
389 rc = __sev_platform_init_locked(&argp->error);
394 return __sev_do_cmd_locked(cmd, NULL, &argp->error);
397 static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp, bool writable)
399 struct sev_device *sev = psp_master->sev_data;
400 struct sev_user_data_pek_csr input;
401 struct sev_data_pek_csr data;
402 void __user *input_address;
409 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
412 memset(&data, 0, sizeof(data));
414 /* userspace wants to query CSR length */
415 if (!input.address || !input.length)
418 /* allocate a physically contiguous buffer to store the CSR blob */
419 input_address = (void __user *)input.address;
420 if (input.length > SEV_FW_BLOB_MAX_SIZE)
423 blob = kmalloc(input.length, GFP_KERNEL);
427 data.address = __psp_pa(blob);
428 data.len = input.length;
431 if (sev->state == SEV_STATE_UNINIT) {
432 ret = __sev_platform_init_locked(&argp->error);
437 ret = __sev_do_cmd_locked(SEV_CMD_PEK_CSR, &data, &argp->error);
439 /* If we query the CSR length, FW responded with expected data. */
440 input.length = data.len;
442 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
448 if (copy_to_user(input_address, blob, input.length))
457 void *psp_copy_user_blob(u64 uaddr, u32 len)
460 return ERR_PTR(-EINVAL);
462 /* verify that blob length does not exceed our limit */
463 if (len > SEV_FW_BLOB_MAX_SIZE)
464 return ERR_PTR(-EINVAL);
466 return memdup_user((void __user *)uaddr, len);
468 EXPORT_SYMBOL_GPL(psp_copy_user_blob);
470 static int sev_get_api_version(void)
472 struct sev_device *sev = psp_master->sev_data;
473 struct sev_user_data_status status;
476 ret = sev_platform_status(&status, &error);
479 "SEV: failed to get status. Error: %#x\n", error);
483 sev->api_major = status.api_major;
484 sev->api_minor = status.api_minor;
485 sev->build = status.build;
486 sev->state = status.state;
491 static int sev_get_firmware(struct device *dev,
492 const struct firmware **firmware)
494 char fw_name_specific[SEV_FW_NAME_SIZE];
495 char fw_name_subset[SEV_FW_NAME_SIZE];
497 snprintf(fw_name_specific, sizeof(fw_name_specific),
498 "amd/amd_sev_fam%.2xh_model%.2xh.sbin",
499 boot_cpu_data.x86, boot_cpu_data.x86_model);
501 snprintf(fw_name_subset, sizeof(fw_name_subset),
502 "amd/amd_sev_fam%.2xh_model%.1xxh.sbin",
503 boot_cpu_data.x86, (boot_cpu_data.x86_model & 0xf0) >> 4);
505 /* Check for SEV FW for a particular model.
506 * Ex. amd_sev_fam17h_model00h.sbin for Family 17h Model 00h
510 * Check for SEV FW common to a subset of models.
511 * Ex. amd_sev_fam17h_model0xh.sbin for
512 * Family 17h Model 00h -- Family 17h Model 0Fh
516 * Fall-back to using generic name: sev.fw
518 if ((firmware_request_nowarn(firmware, fw_name_specific, dev) >= 0) ||
519 (firmware_request_nowarn(firmware, fw_name_subset, dev) >= 0) ||
520 (firmware_request_nowarn(firmware, SEV_FW_FILE, dev) >= 0))
526 /* Don't fail if SEV FW couldn't be updated. Continue with existing SEV FW */
527 static int sev_update_firmware(struct device *dev)
529 struct sev_data_download_firmware *data;
530 const struct firmware *firmware;
531 int ret, error, order;
535 if (sev_get_firmware(dev, &firmware) == -ENOENT) {
536 dev_dbg(dev, "No SEV firmware file present\n");
541 * SEV FW expects the physical address given to it to be 32
542 * byte aligned. Memory allocated has structure placed at the
543 * beginning followed by the firmware being passed to the SEV
544 * FW. Allocate enough memory for data structure + alignment
547 data_size = ALIGN(sizeof(struct sev_data_download_firmware), 32);
549 order = get_order(firmware->size + data_size);
550 p = alloc_pages(GFP_KERNEL, order);
557 * Copy firmware data to a kernel allocated contiguous
560 data = page_address(p);
561 memcpy(page_address(p) + data_size, firmware->data, firmware->size);
563 data->address = __psp_pa(page_address(p) + data_size);
564 data->len = firmware->size;
566 ret = sev_do_cmd(SEV_CMD_DOWNLOAD_FIRMWARE, data, &error);
568 dev_dbg(dev, "Failed to update SEV firmware: %#x\n", error);
570 dev_info(dev, "SEV firmware update successful\n");
572 __free_pages(p, order);
575 release_firmware(firmware);
580 static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp, bool writable)
582 struct sev_device *sev = psp_master->sev_data;
583 struct sev_user_data_pek_cert_import input;
584 struct sev_data_pek_cert_import data;
585 void *pek_blob, *oca_blob;
591 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
594 /* copy PEK certificate blobs from userspace */
595 pek_blob = psp_copy_user_blob(input.pek_cert_address, input.pek_cert_len);
596 if (IS_ERR(pek_blob))
597 return PTR_ERR(pek_blob);
600 data.pek_cert_address = __psp_pa(pek_blob);
601 data.pek_cert_len = input.pek_cert_len;
603 /* copy PEK certificate blobs from userspace */
604 oca_blob = psp_copy_user_blob(input.oca_cert_address, input.oca_cert_len);
605 if (IS_ERR(oca_blob)) {
606 ret = PTR_ERR(oca_blob);
610 data.oca_cert_address = __psp_pa(oca_blob);
611 data.oca_cert_len = input.oca_cert_len;
613 /* If platform is not in INIT state then transition it to INIT */
614 if (sev->state != SEV_STATE_INIT) {
615 ret = __sev_platform_init_locked(&argp->error);
620 ret = __sev_do_cmd_locked(SEV_CMD_PEK_CERT_IMPORT, &data, &argp->error);
629 static int sev_ioctl_do_get_id2(struct sev_issue_cmd *argp)
631 struct sev_user_data_get_id2 input;
632 struct sev_data_get_id data;
633 void __user *input_address;
634 void *id_blob = NULL;
637 /* SEV GET_ID is available from SEV API v0.16 and up */
638 if (!sev_version_greater_or_equal(0, 16))
641 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
644 input_address = (void __user *)input.address;
646 if (input.address && input.length) {
647 id_blob = kmalloc(input.length, GFP_KERNEL);
651 data.address = __psp_pa(id_blob);
652 data.len = input.length;
658 ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, &data, &argp->error);
661 * Firmware will return the length of the ID value (either the minimum
662 * required length or the actual length written), return it to the user.
664 input.length = data.len;
666 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
672 if (copy_to_user(input_address, id_blob, data.len)) {
684 static int sev_ioctl_do_get_id(struct sev_issue_cmd *argp)
686 struct sev_data_get_id *data;
687 u64 data_size, user_size;
691 /* SEV GET_ID available from SEV API v0.16 and up */
692 if (!sev_version_greater_or_equal(0, 16))
695 /* SEV FW expects the buffer it fills with the ID to be
696 * 8-byte aligned. Memory allocated should be enough to
697 * hold data structure + alignment padding + memory
698 * where SEV FW writes the ID.
700 data_size = ALIGN(sizeof(struct sev_data_get_id), 8);
701 user_size = sizeof(struct sev_user_data_get_id);
703 mem = kzalloc(data_size + user_size, GFP_KERNEL);
708 id_blob = mem + data_size;
710 data->address = __psp_pa(id_blob);
711 data->len = user_size;
713 ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error);
715 if (copy_to_user((void __user *)argp->data, id_blob, data->len))
724 static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp, bool writable)
726 struct sev_device *sev = psp_master->sev_data;
727 struct sev_user_data_pdh_cert_export input;
728 void *pdh_blob = NULL, *cert_blob = NULL;
729 struct sev_data_pdh_cert_export data;
730 void __user *input_cert_chain_address;
731 void __user *input_pdh_cert_address;
734 /* If platform is not in INIT state then transition it to INIT. */
735 if (sev->state != SEV_STATE_INIT) {
739 ret = __sev_platform_init_locked(&argp->error);
744 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
747 memset(&data, 0, sizeof(data));
749 /* Userspace wants to query the certificate length. */
750 if (!input.pdh_cert_address ||
751 !input.pdh_cert_len ||
752 !input.cert_chain_address)
755 input_pdh_cert_address = (void __user *)input.pdh_cert_address;
756 input_cert_chain_address = (void __user *)input.cert_chain_address;
758 /* Allocate a physically contiguous buffer to store the PDH blob. */
759 if (input.pdh_cert_len > SEV_FW_BLOB_MAX_SIZE)
762 /* Allocate a physically contiguous buffer to store the cert chain blob. */
763 if (input.cert_chain_len > SEV_FW_BLOB_MAX_SIZE)
766 pdh_blob = kmalloc(input.pdh_cert_len, GFP_KERNEL);
770 data.pdh_cert_address = __psp_pa(pdh_blob);
771 data.pdh_cert_len = input.pdh_cert_len;
773 cert_blob = kmalloc(input.cert_chain_len, GFP_KERNEL);
779 data.cert_chain_address = __psp_pa(cert_blob);
780 data.cert_chain_len = input.cert_chain_len;
783 ret = __sev_do_cmd_locked(SEV_CMD_PDH_CERT_EXPORT, &data, &argp->error);
785 /* If we query the length, FW responded with expected data. */
786 input.cert_chain_len = data.cert_chain_len;
787 input.pdh_cert_len = data.pdh_cert_len;
789 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
795 if (copy_to_user(input_pdh_cert_address,
796 pdh_blob, input.pdh_cert_len)) {
803 if (copy_to_user(input_cert_chain_address,
804 cert_blob, input.cert_chain_len))
815 static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
817 void __user *argp = (void __user *)arg;
818 struct sev_issue_cmd input;
820 bool writable = file->f_mode & FMODE_WRITE;
822 if (!psp_master || !psp_master->sev_data)
825 if (ioctl != SEV_ISSUE_CMD)
828 if (copy_from_user(&input, argp, sizeof(struct sev_issue_cmd)))
831 if (input.cmd > SEV_MAX)
834 mutex_lock(&sev_cmd_mutex);
838 case SEV_FACTORY_RESET:
839 ret = sev_ioctl_do_reset(&input, writable);
841 case SEV_PLATFORM_STATUS:
842 ret = sev_ioctl_do_platform_status(&input);
845 ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PEK_GEN, &input, writable);
848 ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PDH_GEN, &input, writable);
851 ret = sev_ioctl_do_pek_csr(&input, writable);
853 case SEV_PEK_CERT_IMPORT:
854 ret = sev_ioctl_do_pek_import(&input, writable);
856 case SEV_PDH_CERT_EXPORT:
857 ret = sev_ioctl_do_pdh_export(&input, writable);
860 pr_warn_once("SEV_GET_ID command is deprecated, use SEV_GET_ID2\n");
861 ret = sev_ioctl_do_get_id(&input);
864 ret = sev_ioctl_do_get_id2(&input);
871 if (copy_to_user(argp, &input, sizeof(struct sev_issue_cmd)))
874 mutex_unlock(&sev_cmd_mutex);
879 static const struct file_operations sev_fops = {
880 .owner = THIS_MODULE,
881 .unlocked_ioctl = sev_ioctl,
884 int sev_platform_status(struct sev_user_data_status *data, int *error)
886 return sev_do_cmd(SEV_CMD_PLATFORM_STATUS, data, error);
888 EXPORT_SYMBOL_GPL(sev_platform_status);
890 int sev_guest_deactivate(struct sev_data_deactivate *data, int *error)
892 return sev_do_cmd(SEV_CMD_DEACTIVATE, data, error);
894 EXPORT_SYMBOL_GPL(sev_guest_deactivate);
896 int sev_guest_activate(struct sev_data_activate *data, int *error)
898 return sev_do_cmd(SEV_CMD_ACTIVATE, data, error);
900 EXPORT_SYMBOL_GPL(sev_guest_activate);
902 int sev_guest_decommission(struct sev_data_decommission *data, int *error)
904 return sev_do_cmd(SEV_CMD_DECOMMISSION, data, error);
906 EXPORT_SYMBOL_GPL(sev_guest_decommission);
908 int sev_guest_df_flush(int *error)
910 return sev_do_cmd(SEV_CMD_DF_FLUSH, NULL, error);
912 EXPORT_SYMBOL_GPL(sev_guest_df_flush);
914 static void sev_exit(struct kref *ref)
916 misc_deregister(&misc_dev->misc);
921 static int sev_misc_init(struct sev_device *sev)
923 struct device *dev = sev->dev;
927 * SEV feature support can be detected on multiple devices but the SEV
928 * FW commands must be issued on the master. During probe, we do not
929 * know the master hence we create /dev/sev on the first device probe.
930 * sev_do_cmd() finds the right master device to which to issue the
931 * command to the firmware.
934 struct miscdevice *misc;
936 misc_dev = kzalloc(sizeof(*misc_dev), GFP_KERNEL);
940 misc = &misc_dev->misc;
941 misc->minor = MISC_DYNAMIC_MINOR;
942 misc->name = DEVICE_NAME;
943 misc->fops = &sev_fops;
945 ret = misc_register(misc);
949 kref_init(&misc_dev->refcount);
951 kref_get(&misc_dev->refcount);
954 init_waitqueue_head(&sev->int_queue);
955 sev->misc = misc_dev;
956 dev_dbg(dev, "registered SEV device\n");
961 int sev_dev_init(struct psp_device *psp)
963 struct device *dev = psp->dev;
964 struct sev_device *sev;
967 if (!boot_cpu_has(X86_FEATURE_SEV)) {
968 dev_info_once(dev, "SEV: memory encryption not enabled by BIOS\n");
972 sev = devm_kzalloc(dev, sizeof(*sev), GFP_KERNEL);
976 sev->cmd_buf = (void *)devm_get_free_pages(dev, GFP_KERNEL, 0);
985 sev->io_regs = psp->io_regs;
987 sev->vdata = (struct sev_vdata *)psp->vdata->sev;
990 dev_err(dev, "sev: missing driver data\n");
994 psp_set_sev_irq_handler(psp, sev_irq_handler, sev);
996 ret = sev_misc_init(sev);
1000 dev_notice(dev, "sev enabled\n");
1005 psp_clear_sev_irq_handler(psp);
1007 devm_free_pages(dev, (unsigned long)sev->cmd_buf);
1009 devm_kfree(dev, sev);
1011 psp->sev_data = NULL;
1013 dev_notice(dev, "sev initialization failed\n");
1018 void sev_dev_destroy(struct psp_device *psp)
1020 struct sev_device *sev = psp->sev_data;
1026 kref_put(&misc_dev->refcount, sev_exit);
1028 psp_clear_sev_irq_handler(psp);
1031 int sev_issue_cmd_external_user(struct file *filep, unsigned int cmd,
1032 void *data, int *error)
1034 if (!filep || filep->f_op != &sev_fops)
1037 return sev_do_cmd(cmd, data, error);
1039 EXPORT_SYMBOL_GPL(sev_issue_cmd_external_user);
1041 void sev_pci_init(void)
1043 struct sev_device *sev = psp_master->sev_data;
1044 struct page *tmr_page;
1050 psp_timeout = psp_probe_timeout;
1052 if (sev_get_api_version())
1056 * If platform is not in UNINIT state then firmware upgrade and/or
1057 * platform INIT command will fail. These command require UNINIT state.
1059 * In a normal boot we should never run into case where the firmware
1060 * is not in UNINIT state on boot. But in case of kexec boot, a reboot
1061 * may not go through a typical shutdown sequence and may leave the
1062 * firmware in INIT or WORKING state.
1065 if (sev->state != SEV_STATE_UNINIT) {
1066 sev_platform_shutdown(NULL);
1067 sev->state = SEV_STATE_UNINIT;
1070 if (sev_version_greater_or_equal(0, 15) &&
1071 sev_update_firmware(sev->dev) == 0)
1072 sev_get_api_version();
1074 /* Obtain the TMR memory area for SEV-ES use */
1075 tmr_page = alloc_pages(GFP_KERNEL, get_order(SEV_ES_TMR_SIZE));
1077 sev_es_tmr = page_address(tmr_page);
1081 "SEV: TMR allocation failed, SEV-ES support unavailable\n");
1084 /* Initialize the platform */
1085 rc = sev_platform_init(&error);
1086 if (rc && (error == SEV_RET_SECURE_DATA_INVALID)) {
1088 * INIT command returned an integrity check failure
1089 * status code, meaning that firmware load and
1090 * validation of SEV related persistent data has
1091 * failed and persistent state has been erased.
1092 * Retrying INIT command here should succeed.
1094 dev_dbg(sev->dev, "SEV: retrying INIT command");
1095 rc = sev_platform_init(&error);
1099 dev_err(sev->dev, "SEV: failed to INIT error %#x\n", error);
1103 dev_info(sev->dev, "SEV API:%d.%d build:%d\n", sev->api_major,
1104 sev->api_minor, sev->build);
1109 psp_master->sev_data = NULL;
1112 void sev_pci_exit(void)
1114 if (!psp_master->sev_data)
1117 sev_platform_shutdown(NULL);
1120 /* The TMR area was encrypted, flush it from the cache */
1121 wbinvd_on_all_cpus();
1123 free_pages((unsigned long)sev_es_tmr,
1124 get_order(SEV_ES_TMR_SIZE));