// SPDX-License-Identifier: GPL-2.0-only /* * AMD Secure Encrypted Virtualization (SEV) interface * * Copyright (C) 2016,2019 Advanced Micro Devices, Inc. * * Author: Brijesh Singh */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "sp-dev.h" #include "sev-dev.h" #define DEVICE_NAME "sev" #define SEV_FW_FILE "amd/sev.fw" #define SEV_FW_NAME_SIZE 64 static DEFINE_MUTEX(sev_cmd_mutex); static struct sev_misc_dev *misc_dev; static struct psp_device *psp_master; static int psp_cmd_timeout = 100; module_param(psp_cmd_timeout, int, 0644); MODULE_PARM_DESC(psp_cmd_timeout, " default timeout value, in seconds, for PSP commands"); static int psp_probe_timeout = 5; module_param(psp_probe_timeout, int, 0644); MODULE_PARM_DESC(psp_probe_timeout, " default timeout value, in seconds, during PSP device probe"); static bool psp_dead; static int psp_timeout; static inline bool sev_version_greater_or_equal(u8 maj, u8 min) { if (psp_master->api_major > maj) return true; if (psp_master->api_major == maj && psp_master->api_minor >= min) return true; return false; } static struct psp_device *psp_alloc_struct(struct sp_device *sp) { struct device *dev = sp->dev; struct psp_device *psp; psp = devm_kzalloc(dev, sizeof(*psp), GFP_KERNEL); if (!psp) return NULL; psp->dev = dev; psp->sp = sp; snprintf(psp->name, sizeof(psp->name), "psp-%u", sp->ord); return psp; } static irqreturn_t psp_irq_handler(int irq, void *data) { struct psp_device *psp = data; unsigned int status; int reg; /* Read the interrupt status: */ status = ioread32(psp->io_regs + psp->vdata->intsts_reg); /* Check if it is command completion: */ if (!(status & PSP_CMD_COMPLETE)) goto done; /* Check if it is SEV command completion: */ reg = ioread32(psp->io_regs + psp->vdata->cmdresp_reg); if (reg & PSP_CMDRESP_RESP) { psp->sev_int_rcvd = 1; wake_up(&psp->sev_int_queue); } done: /* Clear the interrupt status by writing the same value we read. */ iowrite32(status, psp->io_regs + psp->vdata->intsts_reg); return IRQ_HANDLED; } static int sev_wait_cmd_ioc(struct psp_device *psp, unsigned int *reg, unsigned int timeout) { int ret; ret = wait_event_timeout(psp->sev_int_queue, psp->sev_int_rcvd, timeout * HZ); if (!ret) return -ETIMEDOUT; *reg = ioread32(psp->io_regs + psp->vdata->cmdresp_reg); return 0; } static int sev_cmd_buffer_len(int cmd) { switch (cmd) { case SEV_CMD_INIT: return sizeof(struct sev_data_init); case SEV_CMD_PLATFORM_STATUS: return sizeof(struct sev_user_data_status); case SEV_CMD_PEK_CSR: return sizeof(struct sev_data_pek_csr); case SEV_CMD_PEK_CERT_IMPORT: return sizeof(struct sev_data_pek_cert_import); case SEV_CMD_PDH_CERT_EXPORT: return sizeof(struct sev_data_pdh_cert_export); case SEV_CMD_LAUNCH_START: return sizeof(struct sev_data_launch_start); case SEV_CMD_LAUNCH_UPDATE_DATA: return sizeof(struct sev_data_launch_update_data); case SEV_CMD_LAUNCH_UPDATE_VMSA: return sizeof(struct sev_data_launch_update_vmsa); case SEV_CMD_LAUNCH_FINISH: return sizeof(struct sev_data_launch_finish); case SEV_CMD_LAUNCH_MEASURE: return sizeof(struct sev_data_launch_measure); case SEV_CMD_ACTIVATE: return sizeof(struct sev_data_activate); case SEV_CMD_DEACTIVATE: return sizeof(struct sev_data_deactivate); case SEV_CMD_DECOMMISSION: return sizeof(struct sev_data_decommission); case SEV_CMD_GUEST_STATUS: return sizeof(struct sev_data_guest_status); case SEV_CMD_DBG_DECRYPT: return sizeof(struct sev_data_dbg); case SEV_CMD_DBG_ENCRYPT: return sizeof(struct sev_data_dbg); case SEV_CMD_SEND_START: return sizeof(struct sev_data_send_start); case SEV_CMD_SEND_UPDATE_DATA: return sizeof(struct sev_data_send_update_data); case SEV_CMD_SEND_UPDATE_VMSA: return sizeof(struct sev_data_send_update_vmsa); case SEV_CMD_SEND_FINISH: return sizeof(struct sev_data_send_finish); case SEV_CMD_RECEIVE_START: return sizeof(struct sev_data_receive_start); case SEV_CMD_RECEIVE_FINISH: return sizeof(struct sev_data_receive_finish); case SEV_CMD_RECEIVE_UPDATE_DATA: return sizeof(struct sev_data_receive_update_data); case SEV_CMD_RECEIVE_UPDATE_VMSA: return sizeof(struct sev_data_receive_update_vmsa); case SEV_CMD_LAUNCH_UPDATE_SECRET: return sizeof(struct sev_data_launch_secret); case SEV_CMD_DOWNLOAD_FIRMWARE: return sizeof(struct sev_data_download_firmware); case SEV_CMD_GET_ID: return sizeof(struct sev_data_get_id); default: return 0; } return 0; } static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret) { struct psp_device *psp = psp_master; unsigned int phys_lsb, phys_msb; unsigned int reg, ret = 0; if (!psp) return -ENODEV; if (psp_dead) return -EBUSY; /* Get the physical address of the command buffer */ phys_lsb = data ? lower_32_bits(__psp_pa(data)) : 0; phys_msb = data ? upper_32_bits(__psp_pa(data)) : 0; dev_dbg(psp->dev, "sev command id %#x buffer 0x%08x%08x timeout %us\n", cmd, phys_msb, phys_lsb, psp_timeout); print_hex_dump_debug("(in): ", DUMP_PREFIX_OFFSET, 16, 2, data, sev_cmd_buffer_len(cmd), false); iowrite32(phys_lsb, psp->io_regs + psp->vdata->cmdbuff_addr_lo_reg); iowrite32(phys_msb, psp->io_regs + psp->vdata->cmdbuff_addr_hi_reg); psp->sev_int_rcvd = 0; reg = cmd; reg <<= PSP_CMDRESP_CMD_SHIFT; reg |= PSP_CMDRESP_IOC; iowrite32(reg, psp->io_regs + psp->vdata->cmdresp_reg); /* wait for command completion */ ret = sev_wait_cmd_ioc(psp, ®, psp_timeout); if (ret) { if (psp_ret) *psp_ret = 0; dev_err(psp->dev, "sev command %#x timed out, disabling PSP \n", cmd); psp_dead = true; return ret; } psp_timeout = psp_cmd_timeout; if (psp_ret) *psp_ret = reg & PSP_CMDRESP_ERR_MASK; if (reg & PSP_CMDRESP_ERR_MASK) { dev_dbg(psp->dev, "sev command %#x failed (%#010x)\n", cmd, reg & PSP_CMDRESP_ERR_MASK); ret = -EIO; } print_hex_dump_debug("(out): ", DUMP_PREFIX_OFFSET, 16, 2, data, sev_cmd_buffer_len(cmd), false); return ret; } static int sev_do_cmd(int cmd, void *data, int *psp_ret) { int rc; mutex_lock(&sev_cmd_mutex); rc = __sev_do_cmd_locked(cmd, data, psp_ret); mutex_unlock(&sev_cmd_mutex); return rc; } static int __sev_platform_init_locked(int *error) { struct psp_device *psp = psp_master; int rc = 0; if (!psp) return -ENODEV; if (psp->sev_state == SEV_STATE_INIT) return 0; rc = __sev_do_cmd_locked(SEV_CMD_INIT, &psp->init_cmd_buf, error); if (rc) return rc; psp->sev_state = SEV_STATE_INIT; /* Prepare for first SEV guest launch after INIT */ wbinvd_on_all_cpus(); rc = __sev_do_cmd_locked(SEV_CMD_DF_FLUSH, NULL, error); if (rc) return rc; dev_dbg(psp->dev, "SEV firmware initialized\n"); return rc; } int sev_platform_init(int *error) { int rc; mutex_lock(&sev_cmd_mutex); rc = __sev_platform_init_locked(error); mutex_unlock(&sev_cmd_mutex); return rc; } EXPORT_SYMBOL_GPL(sev_platform_init); static int __sev_platform_shutdown_locked(int *error) { int ret; ret = __sev_do_cmd_locked(SEV_CMD_SHUTDOWN, NULL, error); if (ret) return ret; psp_master->sev_state = SEV_STATE_UNINIT; dev_dbg(psp_master->dev, "SEV firmware shutdown\n"); return ret; } static int sev_platform_shutdown(int *error) { int rc; mutex_lock(&sev_cmd_mutex); rc = __sev_platform_shutdown_locked(NULL); mutex_unlock(&sev_cmd_mutex); return rc; } static int sev_get_platform_state(int *state, int *error) { int rc; rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, &psp_master->status_cmd_buf, error); if (rc) return rc; *state = psp_master->status_cmd_buf.state; return rc; } static int sev_ioctl_do_reset(struct sev_issue_cmd *argp) { int state, rc; if (!capable(CAP_SYS_ADMIN)) return -EPERM; /* * The SEV spec requires that FACTORY_RESET must be issued in * UNINIT state. Before we go further lets check if any guest is * active. * * If FW is in WORKING state then deny the request otherwise issue * SHUTDOWN command do INIT -> UNINIT before issuing the FACTORY_RESET. * */ rc = sev_get_platform_state(&state, &argp->error); if (rc) return rc; if (state == SEV_STATE_WORKING) return -EBUSY; if (state == SEV_STATE_INIT) { rc = __sev_platform_shutdown_locked(&argp->error); if (rc) return rc; } return __sev_do_cmd_locked(SEV_CMD_FACTORY_RESET, NULL, &argp->error); } static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp) { struct sev_user_data_status *data = &psp_master->status_cmd_buf; int ret; ret = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, data, &argp->error); if (ret) return ret; if (copy_to_user((void __user *)argp->data, data, sizeof(*data))) ret = -EFAULT; return ret; } static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp) { int rc; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (psp_master->sev_state == SEV_STATE_UNINIT) { rc = __sev_platform_init_locked(&argp->error); if (rc) return rc; } return __sev_do_cmd_locked(cmd, NULL, &argp->error); } static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp) { struct sev_user_data_pek_csr input; struct sev_data_pek_csr *data; void *blob = NULL; int ret; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (copy_from_user(&input, (void __user *)argp->data, sizeof(input))) return -EFAULT; data = kzalloc(sizeof(*data), GFP_KERNEL); if (!data) return -ENOMEM; /* userspace wants to query CSR length */ if (!input.address || !input.length) goto cmd; /* allocate a physically contiguous buffer to store the CSR blob */ if (!access_ok(input.address, input.length) || input.length > SEV_FW_BLOB_MAX_SIZE) { ret = -EFAULT; goto e_free; } blob = kmalloc(input.length, GFP_KERNEL); if (!blob) { ret = -ENOMEM; goto e_free; } data->address = __psp_pa(blob); data->len = input.length; cmd: if (psp_master->sev_state == SEV_STATE_UNINIT) { ret = __sev_platform_init_locked(&argp->error); if (ret) goto e_free_blob; } ret = __sev_do_cmd_locked(SEV_CMD_PEK_CSR, data, &argp->error); /* If we query the CSR length, FW responded with expected data. */ input.length = data->len; if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) { ret = -EFAULT; goto e_free_blob; } if (blob) { if (copy_to_user((void __user *)input.address, blob, input.length)) ret = -EFAULT; } e_free_blob: kfree(blob); e_free: kfree(data); return ret; } void *psp_copy_user_blob(u64 __user uaddr, u32 len) { if (!uaddr || !len) return ERR_PTR(-EINVAL); /* verify that blob length does not exceed our limit */ if (len > SEV_FW_BLOB_MAX_SIZE) return ERR_PTR(-EINVAL); return memdup_user((void __user *)(uintptr_t)uaddr, len); } EXPORT_SYMBOL_GPL(psp_copy_user_blob); static int sev_get_api_version(void) { struct sev_user_data_status *status; int error = 0, ret; status = &psp_master->status_cmd_buf; ret = sev_platform_status(status, &error); if (ret) { dev_err(psp_master->dev, "SEV: failed to get status. Error: %#x\n", error); return 1; } psp_master->api_major = status->api_major; psp_master->api_minor = status->api_minor; psp_master->build = status->build; psp_master->sev_state = status->state; return 0; } static int sev_get_firmware(struct device *dev, const struct firmware **firmware) { char fw_name_specific[SEV_FW_NAME_SIZE]; char fw_name_subset[SEV_FW_NAME_SIZE]; snprintf(fw_name_specific, sizeof(fw_name_specific), "amd/amd_sev_fam%.2xh_model%.2xh.sbin", boot_cpu_data.x86, boot_cpu_data.x86_model); snprintf(fw_name_subset, sizeof(fw_name_subset), "amd/amd_sev_fam%.2xh_model%.1xxh.sbin", boot_cpu_data.x86, (boot_cpu_data.x86_model & 0xf0) >> 4); /* Check for SEV FW for a particular model. * Ex. amd_sev_fam17h_model00h.sbin for Family 17h Model 00h * * or * * Check for SEV FW common to a subset of models. * Ex. amd_sev_fam17h_model0xh.sbin for * Family 17h Model 00h -- Family 17h Model 0Fh * * or * * Fall-back to using generic name: sev.fw */ if ((firmware_request_nowarn(firmware, fw_name_specific, dev) >= 0) || (firmware_request_nowarn(firmware, fw_name_subset, dev) >= 0) || (firmware_request_nowarn(firmware, SEV_FW_FILE, dev) >= 0)) return 0; return -ENOENT; } /* Don't fail if SEV FW couldn't be updated. Continue with existing SEV FW */ static int sev_update_firmware(struct device *dev) { struct sev_data_download_firmware *data; const struct firmware *firmware; int ret, error, order; struct page *p; u64 data_size; if (sev_get_firmware(dev, &firmware) == -ENOENT) { dev_dbg(dev, "No SEV firmware file present\n"); return -1; } /* * SEV FW expects the physical address given to it to be 32 * byte aligned. Memory allocated has structure placed at the * beginning followed by the firmware being passed to the SEV * FW. Allocate enough memory for data structure + alignment * padding + SEV FW. */ data_size = ALIGN(sizeof(struct sev_data_download_firmware), 32); order = get_order(firmware->size + data_size); p = alloc_pages(GFP_KERNEL, order); if (!p) { ret = -1; goto fw_err; } /* * Copy firmware data to a kernel allocated contiguous * memory region. */ data = page_address(p); memcpy(page_address(p) + data_size, firmware->data, firmware->size); data->address = __psp_pa(page_address(p) + data_size); data->len = firmware->size; ret = sev_do_cmd(SEV_CMD_DOWNLOAD_FIRMWARE, data, &error); if (ret) dev_dbg(dev, "Failed to update SEV firmware: %#x\n", error); else dev_info(dev, "SEV firmware update successful\n"); __free_pages(p, order); fw_err: release_firmware(firmware); return ret; } static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp) { struct sev_user_data_pek_cert_import input; struct sev_data_pek_cert_import *data; void *pek_blob, *oca_blob; int ret; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (copy_from_user(&input, (void __user *)argp->data, sizeof(input))) return -EFAULT; data = kzalloc(sizeof(*data), GFP_KERNEL); if (!data) return -ENOMEM; /* copy PEK certificate blobs from userspace */ pek_blob = psp_copy_user_blob(input.pek_cert_address, input.pek_cert_len); if (IS_ERR(pek_blob)) { ret = PTR_ERR(pek_blob); goto e_free; } data->pek_cert_address = __psp_pa(pek_blob); data->pek_cert_len = input.pek_cert_len; /* copy PEK certificate blobs from userspace */ oca_blob = psp_copy_user_blob(input.oca_cert_address, input.oca_cert_len); if (IS_ERR(oca_blob)) { ret = PTR_ERR(oca_blob); goto e_free_pek; } data->oca_cert_address = __psp_pa(oca_blob); data->oca_cert_len = input.oca_cert_len; /* If platform is not in INIT state then transition it to INIT */ if (psp_master->sev_state != SEV_STATE_INIT) { ret = __sev_platform_init_locked(&argp->error); if (ret) goto e_free_oca; } ret = __sev_do_cmd_locked(SEV_CMD_PEK_CERT_IMPORT, data, &argp->error); e_free_oca: kfree(oca_blob); e_free_pek: kfree(pek_blob); e_free: kfree(data); return ret; } static int sev_ioctl_do_get_id2(struct sev_issue_cmd *argp) { struct sev_user_data_get_id2 input; struct sev_data_get_id *data; void *id_blob = NULL; int ret; /* SEV GET_ID is available from SEV API v0.16 and up */ if (!sev_version_greater_or_equal(0, 16)) return -ENOTSUPP; if (copy_from_user(&input, (void __user *)argp->data, sizeof(input))) return -EFAULT; /* Check if we have write access to the userspace buffer */ if (input.address && input.length && !access_ok(input.address, input.length)) return -EFAULT; data = kzalloc(sizeof(*data), GFP_KERNEL); if (!data) return -ENOMEM; if (input.address && input.length) { id_blob = kmalloc(input.length, GFP_KERNEL); if (!id_blob) { kfree(data); return -ENOMEM; } data->address = __psp_pa(id_blob); data->len = input.length; } ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error); /* * Firmware will return the length of the ID value (either the minimum * required length or the actual length written), return it to the user. */ input.length = data->len; if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) { ret = -EFAULT; goto e_free; } if (id_blob) { if (copy_to_user((void __user *)input.address, id_blob, data->len)) { ret = -EFAULT; goto e_free; } } e_free: kfree(id_blob); kfree(data); return ret; } static int sev_ioctl_do_get_id(struct sev_issue_cmd *argp) { struct sev_data_get_id *data; u64 data_size, user_size; void *id_blob, *mem; int ret; /* SEV GET_ID available from SEV API v0.16 and up */ if (!sev_version_greater_or_equal(0, 16)) return -ENOTSUPP; /* SEV FW expects the buffer it fills with the ID to be * 8-byte aligned. Memory allocated should be enough to * hold data structure + alignment padding + memory * where SEV FW writes the ID. */ data_size = ALIGN(sizeof(struct sev_data_get_id), 8); user_size = sizeof(struct sev_user_data_get_id); mem = kzalloc(data_size + user_size, GFP_KERNEL); if (!mem) return -ENOMEM; data = mem; id_blob = mem + data_size; data->address = __psp_pa(id_blob); data->len = user_size; ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error); if (!ret) { if (copy_to_user((void __user *)argp->data, id_blob, data->len)) ret = -EFAULT; } kfree(mem); return ret; } static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp) { struct sev_user_data_pdh_cert_export input; void *pdh_blob = NULL, *cert_blob = NULL; struct sev_data_pdh_cert_export *data; int ret; /* If platform is not in INIT state then transition it to INIT. */ if (psp_master->sev_state != SEV_STATE_INIT) { if (!capable(CAP_SYS_ADMIN)) return -EPERM; ret = __sev_platform_init_locked(&argp->error); if (ret) return ret; } if (copy_from_user(&input, (void __user *)argp->data, sizeof(input))) return -EFAULT; data = kzalloc(sizeof(*data), GFP_KERNEL); if (!data) return -ENOMEM; /* Userspace wants to query the certificate length. */ if (!input.pdh_cert_address || !input.pdh_cert_len || !input.cert_chain_address) goto cmd; /* Allocate a physically contiguous buffer to store the PDH blob. */ if ((input.pdh_cert_len > SEV_FW_BLOB_MAX_SIZE) || !access_ok(input.pdh_cert_address, input.pdh_cert_len)) { ret = -EFAULT; goto e_free; } /* Allocate a physically contiguous buffer to store the cert chain blob. */ if ((input.cert_chain_len > SEV_FW_BLOB_MAX_SIZE) || !access_ok(input.cert_chain_address, input.cert_chain_len)) { ret = -EFAULT; goto e_free; } pdh_blob = kmalloc(input.pdh_cert_len, GFP_KERNEL); if (!pdh_blob) { ret = -ENOMEM; goto e_free; } data->pdh_cert_address = __psp_pa(pdh_blob); data->pdh_cert_len = input.pdh_cert_len; cert_blob = kmalloc(input.cert_chain_len, GFP_KERNEL); if (!cert_blob) { ret = -ENOMEM; goto e_free_pdh; } data->cert_chain_address = __psp_pa(cert_blob); data->cert_chain_len = input.cert_chain_len; cmd: ret = __sev_do_cmd_locked(SEV_CMD_PDH_CERT_EXPORT, data, &argp->error); /* If we query the length, FW responded with expected data. */ input.cert_chain_len = data->cert_chain_len; input.pdh_cert_len = data->pdh_cert_len; if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) { ret = -EFAULT; goto e_free_cert; } if (pdh_blob) { if (copy_to_user((void __user *)input.pdh_cert_address, pdh_blob, input.pdh_cert_len)) { ret = -EFAULT; goto e_free_cert; } } if (cert_blob) { if (copy_to_user((void __user *)input.cert_chain_address, cert_blob, input.cert_chain_len)) ret = -EFAULT; } e_free_cert: kfree(cert_blob); e_free_pdh: kfree(pdh_blob); e_free: kfree(data); return ret; } static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg) { void __user *argp = (void __user *)arg; struct sev_issue_cmd input; int ret = -EFAULT; if (!psp_master) return -ENODEV; if (ioctl != SEV_ISSUE_CMD) return -EINVAL; if (copy_from_user(&input, argp, sizeof(struct sev_issue_cmd))) return -EFAULT; if (input.cmd > SEV_MAX) return -EINVAL; mutex_lock(&sev_cmd_mutex); switch (input.cmd) { case SEV_FACTORY_RESET: ret = sev_ioctl_do_reset(&input); break; case SEV_PLATFORM_STATUS: ret = sev_ioctl_do_platform_status(&input); break; case SEV_PEK_GEN: ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PEK_GEN, &input); break; case SEV_PDH_GEN: ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PDH_GEN, &input); break; case SEV_PEK_CSR: ret = sev_ioctl_do_pek_csr(&input); break; case SEV_PEK_CERT_IMPORT: ret = sev_ioctl_do_pek_import(&input); break; case SEV_PDH_CERT_EXPORT: ret = sev_ioctl_do_pdh_export(&input); break; case SEV_GET_ID: pr_warn_once("SEV_GET_ID command is deprecated, use SEV_GET_ID2\n"); ret = sev_ioctl_do_get_id(&input); break; case SEV_GET_ID2: ret = sev_ioctl_do_get_id2(&input); break; default: ret = -EINVAL; goto out; } if (copy_to_user(argp, &input, sizeof(struct sev_issue_cmd))) ret = -EFAULT; out: mutex_unlock(&sev_cmd_mutex); return ret; } static const struct file_operations sev_fops = { .owner = THIS_MODULE, .unlocked_ioctl = sev_ioctl, }; int sev_platform_status(struct sev_user_data_status *data, int *error) { return sev_do_cmd(SEV_CMD_PLATFORM_STATUS, data, error); } EXPORT_SYMBOL_GPL(sev_platform_status); int sev_guest_deactivate(struct sev_data_deactivate *data, int *error) { return sev_do_cmd(SEV_CMD_DEACTIVATE, data, error); } EXPORT_SYMBOL_GPL(sev_guest_deactivate); int sev_guest_activate(struct sev_data_activate *data, int *error) { return sev_do_cmd(SEV_CMD_ACTIVATE, data, error); } EXPORT_SYMBOL_GPL(sev_guest_activate); int sev_guest_decommission(struct sev_data_decommission *data, int *error) { return sev_do_cmd(SEV_CMD_DECOMMISSION, data, error); } EXPORT_SYMBOL_GPL(sev_guest_decommission); int sev_guest_df_flush(int *error) { return sev_do_cmd(SEV_CMD_DF_FLUSH, NULL, error); } EXPORT_SYMBOL_GPL(sev_guest_df_flush); static void sev_exit(struct kref *ref) { struct sev_misc_dev *misc_dev = container_of(ref, struct sev_misc_dev, refcount); misc_deregister(&misc_dev->misc); } static int sev_misc_init(struct psp_device *psp) { struct device *dev = psp->dev; int ret; /* * SEV feature support can be detected on multiple devices but the SEV * FW commands must be issued on the master. During probe, we do not * know the master hence we create /dev/sev on the first device probe. * sev_do_cmd() finds the right master device to which to issue the * command to the firmware. */ if (!misc_dev) { struct miscdevice *misc; misc_dev = devm_kzalloc(dev, sizeof(*misc_dev), GFP_KERNEL); if (!misc_dev) return -ENOMEM; misc = &misc_dev->misc; misc->minor = MISC_DYNAMIC_MINOR; misc->name = DEVICE_NAME; misc->fops = &sev_fops; ret = misc_register(misc); if (ret) return ret; kref_init(&misc_dev->refcount); } else { kref_get(&misc_dev->refcount); } init_waitqueue_head(&psp->sev_int_queue); psp->sev_misc = misc_dev; dev_dbg(dev, "registered SEV device\n"); return 0; } static int psp_check_sev_support(struct psp_device *psp) { unsigned int val = ioread32(psp->io_regs + psp->vdata->feature_reg); /* * Check for a access to the registers. If this read returns * 0xffffffff, it's likely that the system is running a broken * BIOS which disallows access to the device. Stop here and * fail the PSP initialization (but not the load, as the CCP * could get properly initialized). */ if (val == 0xffffffff) { dev_notice(psp->dev, "psp: unable to access the device: you might be running a broken BIOS.\n"); return -ENODEV; } if (!(val & 1)) { /* Device does not support the SEV feature */ dev_dbg(psp->dev, "psp does not support SEV\n"); return -ENODEV; } return 0; } int psp_dev_init(struct sp_device *sp) { struct device *dev = sp->dev; struct psp_device *psp; int ret; ret = -ENOMEM; psp = psp_alloc_struct(sp); if (!psp) goto e_err; sp->psp_data = psp; psp->vdata = (struct psp_vdata *)sp->dev_vdata->psp_vdata; if (!psp->vdata) { ret = -ENODEV; dev_err(dev, "missing driver data\n"); goto e_err; } psp->io_regs = sp->io_map; ret = psp_check_sev_support(psp); if (ret) goto e_disable; /* Disable and clear interrupts until ready */ iowrite32(0, psp->io_regs + psp->vdata->inten_reg); iowrite32(-1, psp->io_regs + psp->vdata->intsts_reg); /* Request an irq */ ret = sp_request_psp_irq(psp->sp, psp_irq_handler, psp->name, psp); if (ret) { dev_err(dev, "psp: unable to allocate an IRQ\n"); goto e_err; } ret = sev_misc_init(psp); if (ret) goto e_irq; if (sp->set_psp_master_device) sp->set_psp_master_device(sp); /* Enable interrupt */ iowrite32(-1, psp->io_regs + psp->vdata->inten_reg); dev_notice(dev, "psp enabled\n"); return 0; e_irq: sp_free_psp_irq(psp->sp, psp); e_err: sp->psp_data = NULL; dev_notice(dev, "psp initialization failed\n"); return ret; e_disable: sp->psp_data = NULL; return ret; } void psp_dev_destroy(struct sp_device *sp) { struct psp_device *psp = sp->psp_data; if (!psp) return; if (psp->sev_misc) kref_put(&misc_dev->refcount, sev_exit); sp_free_psp_irq(sp, psp); } int sev_issue_cmd_external_user(struct file *filep, unsigned int cmd, void *data, int *error) { if (!filep || filep->f_op != &sev_fops) return -EBADF; return sev_do_cmd(cmd, data, error); } EXPORT_SYMBOL_GPL(sev_issue_cmd_external_user); void psp_pci_init(void) { struct sp_device *sp; int error, rc; sp = sp_get_psp_master_device(); if (!sp) return; psp_master = sp->psp_data; psp_timeout = psp_probe_timeout; if (sev_get_api_version()) goto err; /* * If platform is not in UNINIT state then firmware upgrade and/or * platform INIT command will fail. These command require UNINIT state. * * In a normal boot we should never run into case where the firmware * is not in UNINIT state on boot. But in case of kexec boot, a reboot * may not go through a typical shutdown sequence and may leave the * firmware in INIT or WORKING state. */ if (psp_master->sev_state != SEV_STATE_UNINIT) { sev_platform_shutdown(NULL); psp_master->sev_state = SEV_STATE_UNINIT; } if (sev_version_greater_or_equal(0, 15) && sev_update_firmware(psp_master->dev) == 0) sev_get_api_version(); /* Initialize the platform */ rc = sev_platform_init(&error); if (rc && (error == SEV_RET_SECURE_DATA_INVALID)) { /* * INIT command returned an integrity check failure * status code, meaning that firmware load and * validation of SEV related persistent data has * failed and persistent state has been erased. * Retrying INIT command here should succeed. */ dev_dbg(sp->dev, "SEV: retrying INIT command"); rc = sev_platform_init(&error); } if (rc) { dev_err(sp->dev, "SEV: failed to INIT error %#x\n", error); return; } dev_info(sp->dev, "SEV API:%d.%d build:%d\n", psp_master->api_major, psp_master->api_minor, psp_master->build); return; err: psp_master = NULL; } void psp_pci_exit(void) { if (!psp_master) return; sev_platform_shutdown(NULL); }