| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * AMD Platform Security Processor (PSP) interface |
| * |
| * Copyright (C) 2016,2018 Advanced Micro Devices, Inc. |
| * |
| * Author: Brijesh Singh <brijesh.singh@amd.com> |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/kthread.h> |
| #include <linux/sched.h> |
| #include <linux/interrupt.h> |
| #include <linux/spinlock.h> |
| #include <linux/spinlock_types.h> |
| #include <linux/types.h> |
| #include <linux/mutex.h> |
| #include <linux/delay.h> |
| #include <linux/hw_random.h> |
| #include <linux/ccp.h> |
| #include <linux/firmware.h> |
| |
| #include "sp-dev.h" |
| #include "psp-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"); |
| |
| MODULE_FIRMWARE("amd/amd_sev_fam17h_model0xh.sbin"); /* 1st gen EPYC */ |
| MODULE_FIRMWARE("amd/amd_sev_fam17h_model3xh.sbin"); /* 2nd gen EPYC */ |
| MODULE_FIRMWARE("amd/amd_sev_fam19h_model0xh.sbin"); /* 3rd gen EPYC */ |
| |
| 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; |
| 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; |
| |
| /* |
| * 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 (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 (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 (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 (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: |
| /* 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_cert; |
| } |
| |
| 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) |
| { |
| /* Check if device supports SEV feature */ |
| if (!(ioread32(psp->io_regs + psp->vdata->feature_reg) & 1)) { |
| 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) { |
| 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); |
| } |