1377 lines
33 KiB
C
1377 lines
33 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* AMD Secure Encrypted Virtualization (SEV) interface
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*
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* Copyright (C) 2016,2019 Advanced Micro Devices, Inc.
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*
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* Author: Brijesh Singh <brijesh.singh@amd.com>
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/kthread.h>
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <linux/spinlock.h>
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#include <linux/spinlock_types.h>
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#include <linux/types.h>
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#include <linux/mutex.h>
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#include <linux/delay.h>
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#include <linux/hw_random.h>
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#include <linux/ccp.h>
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#include <linux/firmware.h>
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#include <linux/gfp.h>
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#include <linux/cpufeature.h>
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#include <linux/fs.h>
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#include <linux/fs_struct.h>
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#include <asm/smp.h>
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#include <asm/cacheflush.h>
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#include "psp-dev.h"
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#include "sev-dev.h"
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#define DEVICE_NAME "sev"
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#define SEV_FW_FILE "amd/sev.fw"
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#define SEV_FW_NAME_SIZE 64
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static DEFINE_MUTEX(sev_cmd_mutex);
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static struct sev_misc_dev *misc_dev;
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static int psp_cmd_timeout = 100;
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module_param(psp_cmd_timeout, int, 0644);
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MODULE_PARM_DESC(psp_cmd_timeout, " default timeout value, in seconds, for PSP commands");
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static int psp_probe_timeout = 5;
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module_param(psp_probe_timeout, int, 0644);
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MODULE_PARM_DESC(psp_probe_timeout, " default timeout value, in seconds, during PSP device probe");
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static char *init_ex_path;
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module_param(init_ex_path, charp, 0444);
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MODULE_PARM_DESC(init_ex_path, " Path for INIT_EX data; if set try INIT_EX");
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static bool psp_init_on_probe = true;
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module_param(psp_init_on_probe, bool, 0444);
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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");
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MODULE_FIRMWARE("amd/amd_sev_fam17h_model0xh.sbin"); /* 1st gen EPYC */
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MODULE_FIRMWARE("amd/amd_sev_fam17h_model3xh.sbin"); /* 2nd gen EPYC */
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MODULE_FIRMWARE("amd/amd_sev_fam19h_model0xh.sbin"); /* 3rd gen EPYC */
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static bool psp_dead;
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static int psp_timeout;
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/* Trusted Memory Region (TMR):
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* The TMR is a 1MB area that must be 1MB aligned. Use the page allocator
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* to allocate the memory, which will return aligned memory for the specified
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* allocation order.
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*/
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#define SEV_ES_TMR_SIZE (1024 * 1024)
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static void *sev_es_tmr;
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/* INIT_EX NV Storage:
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* The NV Storage is a 32Kb area and must be 4Kb page aligned. Use the page
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* allocator to allocate the memory, which will return aligned memory for the
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* specified allocation order.
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*/
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#define NV_LENGTH (32 * 1024)
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static void *sev_init_ex_buffer;
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static inline bool sev_version_greater_or_equal(u8 maj, u8 min)
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{
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struct sev_device *sev = psp_master->sev_data;
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if (sev->api_major > maj)
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return true;
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if (sev->api_major == maj && sev->api_minor >= min)
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return true;
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return false;
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}
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static void sev_irq_handler(int irq, void *data, unsigned int status)
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{
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struct sev_device *sev = data;
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int reg;
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/* Check if it is command completion: */
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if (!(status & SEV_CMD_COMPLETE))
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return;
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/* Check if it is SEV command completion: */
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reg = ioread32(sev->io_regs + sev->vdata->cmdresp_reg);
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if (reg & PSP_CMDRESP_RESP) {
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sev->int_rcvd = 1;
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wake_up(&sev->int_queue);
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}
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}
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static int sev_wait_cmd_ioc(struct sev_device *sev,
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unsigned int *reg, unsigned int timeout)
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{
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int ret;
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ret = wait_event_timeout(sev->int_queue,
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sev->int_rcvd, timeout * HZ);
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if (!ret)
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return -ETIMEDOUT;
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*reg = ioread32(sev->io_regs + sev->vdata->cmdresp_reg);
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return 0;
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}
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static int sev_cmd_buffer_len(int cmd)
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{
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switch (cmd) {
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case SEV_CMD_INIT: return sizeof(struct sev_data_init);
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case SEV_CMD_INIT_EX: return sizeof(struct sev_data_init_ex);
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case SEV_CMD_PLATFORM_STATUS: return sizeof(struct sev_user_data_status);
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case SEV_CMD_PEK_CSR: return sizeof(struct sev_data_pek_csr);
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case SEV_CMD_PEK_CERT_IMPORT: return sizeof(struct sev_data_pek_cert_import);
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case SEV_CMD_PDH_CERT_EXPORT: return sizeof(struct sev_data_pdh_cert_export);
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case SEV_CMD_LAUNCH_START: return sizeof(struct sev_data_launch_start);
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case SEV_CMD_LAUNCH_UPDATE_DATA: return sizeof(struct sev_data_launch_update_data);
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case SEV_CMD_LAUNCH_UPDATE_VMSA: return sizeof(struct sev_data_launch_update_vmsa);
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case SEV_CMD_LAUNCH_FINISH: return sizeof(struct sev_data_launch_finish);
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case SEV_CMD_LAUNCH_MEASURE: return sizeof(struct sev_data_launch_measure);
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case SEV_CMD_ACTIVATE: return sizeof(struct sev_data_activate);
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case SEV_CMD_DEACTIVATE: return sizeof(struct sev_data_deactivate);
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case SEV_CMD_DECOMMISSION: return sizeof(struct sev_data_decommission);
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case SEV_CMD_GUEST_STATUS: return sizeof(struct sev_data_guest_status);
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case SEV_CMD_DBG_DECRYPT: return sizeof(struct sev_data_dbg);
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case SEV_CMD_DBG_ENCRYPT: return sizeof(struct sev_data_dbg);
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case SEV_CMD_SEND_START: return sizeof(struct sev_data_send_start);
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case SEV_CMD_SEND_UPDATE_DATA: return sizeof(struct sev_data_send_update_data);
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case SEV_CMD_SEND_UPDATE_VMSA: return sizeof(struct sev_data_send_update_vmsa);
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case SEV_CMD_SEND_FINISH: return sizeof(struct sev_data_send_finish);
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case SEV_CMD_RECEIVE_START: return sizeof(struct sev_data_receive_start);
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case SEV_CMD_RECEIVE_FINISH: return sizeof(struct sev_data_receive_finish);
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case SEV_CMD_RECEIVE_UPDATE_DATA: return sizeof(struct sev_data_receive_update_data);
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case SEV_CMD_RECEIVE_UPDATE_VMSA: return sizeof(struct sev_data_receive_update_vmsa);
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case SEV_CMD_LAUNCH_UPDATE_SECRET: return sizeof(struct sev_data_launch_secret);
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case SEV_CMD_DOWNLOAD_FIRMWARE: return sizeof(struct sev_data_download_firmware);
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case SEV_CMD_GET_ID: return sizeof(struct sev_data_get_id);
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case SEV_CMD_ATTESTATION_REPORT: return sizeof(struct sev_data_attestation_report);
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case SEV_CMD_SEND_CANCEL: return sizeof(struct sev_data_send_cancel);
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default: return 0;
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}
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return 0;
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}
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static void *sev_fw_alloc(unsigned long len)
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{
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struct page *page;
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page = alloc_pages(GFP_KERNEL, get_order(len));
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if (!page)
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return NULL;
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return page_address(page);
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}
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static struct file *open_file_as_root(const char *filename, int flags, umode_t mode)
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{
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struct file *fp;
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struct path root;
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struct cred *cred;
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const struct cred *old_cred;
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task_lock(&init_task);
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get_fs_root(init_task.fs, &root);
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task_unlock(&init_task);
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cred = prepare_creds();
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if (!cred)
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return ERR_PTR(-ENOMEM);
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cred->fsuid = GLOBAL_ROOT_UID;
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old_cred = override_creds(cred);
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fp = file_open_root(&root, filename, flags, mode);
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path_put(&root);
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revert_creds(old_cred);
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return fp;
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}
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static int sev_read_init_ex_file(void)
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{
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struct sev_device *sev = psp_master->sev_data;
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struct file *fp;
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ssize_t nread;
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lockdep_assert_held(&sev_cmd_mutex);
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if (!sev_init_ex_buffer)
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return -EOPNOTSUPP;
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fp = open_file_as_root(init_ex_path, O_RDONLY, 0);
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if (IS_ERR(fp)) {
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int ret = PTR_ERR(fp);
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if (ret == -ENOENT) {
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dev_info(sev->dev,
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"SEV: %s does not exist and will be created later.\n",
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init_ex_path);
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ret = 0;
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} else {
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dev_err(sev->dev,
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"SEV: could not open %s for read, error %d\n",
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init_ex_path, ret);
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}
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return ret;
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}
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nread = kernel_read(fp, sev_init_ex_buffer, NV_LENGTH, NULL);
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if (nread != NV_LENGTH) {
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dev_info(sev->dev,
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"SEV: could not read %u bytes to non volatile memory area, ret %ld\n",
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NV_LENGTH, nread);
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}
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dev_dbg(sev->dev, "SEV: read %ld bytes from NV file\n", nread);
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filp_close(fp, NULL);
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return 0;
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}
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static int sev_write_init_ex_file(void)
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{
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struct sev_device *sev = psp_master->sev_data;
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struct file *fp;
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loff_t offset = 0;
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ssize_t nwrite;
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lockdep_assert_held(&sev_cmd_mutex);
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if (!sev_init_ex_buffer)
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return 0;
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fp = open_file_as_root(init_ex_path, O_CREAT | O_WRONLY, 0600);
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if (IS_ERR(fp)) {
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int ret = PTR_ERR(fp);
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dev_err(sev->dev,
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"SEV: could not open file for write, error %d\n",
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ret);
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return ret;
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}
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nwrite = kernel_write(fp, sev_init_ex_buffer, NV_LENGTH, &offset);
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vfs_fsync(fp, 0);
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filp_close(fp, NULL);
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if (nwrite != NV_LENGTH) {
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dev_err(sev->dev,
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"SEV: failed to write %u bytes to non volatile memory area, ret %ld\n",
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NV_LENGTH, nwrite);
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return -EIO;
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}
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dev_dbg(sev->dev, "SEV: write successful to NV file\n");
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return 0;
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}
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static int sev_write_init_ex_file_if_required(int cmd_id)
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{
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lockdep_assert_held(&sev_cmd_mutex);
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if (!sev_init_ex_buffer)
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return 0;
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/*
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* Only a few platform commands modify the SPI/NV area, but none of the
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* non-platform commands do. Only INIT(_EX), PLATFORM_RESET, PEK_GEN,
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* PEK_CERT_IMPORT, and PDH_GEN do.
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*/
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switch (cmd_id) {
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case SEV_CMD_FACTORY_RESET:
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case SEV_CMD_INIT_EX:
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case SEV_CMD_PDH_GEN:
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case SEV_CMD_PEK_CERT_IMPORT:
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case SEV_CMD_PEK_GEN:
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break;
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default:
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return 0;
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}
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return sev_write_init_ex_file();
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}
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static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret)
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{
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struct psp_device *psp = psp_master;
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struct sev_device *sev;
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unsigned int phys_lsb, phys_msb;
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unsigned int reg, ret = 0;
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int buf_len;
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if (!psp || !psp->sev_data)
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return -ENODEV;
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if (psp_dead)
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return -EBUSY;
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sev = psp->sev_data;
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buf_len = sev_cmd_buffer_len(cmd);
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if (WARN_ON_ONCE(!data != !buf_len))
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return -EINVAL;
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/*
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* Copy the incoming data to driver's scratch buffer as __pa() will not
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* work for some memory, e.g. vmalloc'd addresses, and @data may not be
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* physically contiguous.
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*/
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if (data)
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memcpy(sev->cmd_buf, data, buf_len);
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/* Get the physical address of the command buffer */
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phys_lsb = data ? lower_32_bits(__psp_pa(sev->cmd_buf)) : 0;
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phys_msb = data ? upper_32_bits(__psp_pa(sev->cmd_buf)) : 0;
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dev_dbg(sev->dev, "sev command id %#x buffer 0x%08x%08x timeout %us\n",
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cmd, phys_msb, phys_lsb, psp_timeout);
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print_hex_dump_debug("(in): ", DUMP_PREFIX_OFFSET, 16, 2, data,
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buf_len, false);
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iowrite32(phys_lsb, sev->io_regs + sev->vdata->cmdbuff_addr_lo_reg);
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iowrite32(phys_msb, sev->io_regs + sev->vdata->cmdbuff_addr_hi_reg);
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sev->int_rcvd = 0;
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reg = cmd;
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reg <<= SEV_CMDRESP_CMD_SHIFT;
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reg |= SEV_CMDRESP_IOC;
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iowrite32(reg, sev->io_regs + sev->vdata->cmdresp_reg);
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/* wait for command completion */
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ret = sev_wait_cmd_ioc(sev, ®, psp_timeout);
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if (ret) {
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if (psp_ret)
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*psp_ret = 0;
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dev_err(sev->dev, "sev command %#x timed out, disabling PSP\n", cmd);
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psp_dead = true;
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return ret;
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}
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psp_timeout = psp_cmd_timeout;
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if (psp_ret)
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*psp_ret = reg & PSP_CMDRESP_ERR_MASK;
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if (reg & PSP_CMDRESP_ERR_MASK) {
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dev_dbg(sev->dev, "sev command %#x failed (%#010x)\n",
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cmd, reg & PSP_CMDRESP_ERR_MASK);
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ret = -EIO;
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} else {
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ret = sev_write_init_ex_file_if_required(cmd);
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}
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print_hex_dump_debug("(out): ", DUMP_PREFIX_OFFSET, 16, 2, data,
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buf_len, false);
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/*
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* Copy potential output from the PSP back to data. Do this even on
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* failure in case the caller wants to glean something from the error.
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*/
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if (data)
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memcpy(data, sev->cmd_buf, buf_len);
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return ret;
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}
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static int sev_do_cmd(int cmd, void *data, int *psp_ret)
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{
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int rc;
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mutex_lock(&sev_cmd_mutex);
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rc = __sev_do_cmd_locked(cmd, data, psp_ret);
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mutex_unlock(&sev_cmd_mutex);
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return rc;
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}
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static int __sev_init_locked(int *error)
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{
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struct sev_data_init data;
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memset(&data, 0, sizeof(data));
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if (sev_es_tmr) {
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/*
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* Do not include the encryption mask on the physical
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* address of the TMR (firmware should clear it anyway).
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*/
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data.tmr_address = __pa(sev_es_tmr);
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data.flags |= SEV_INIT_FLAGS_SEV_ES;
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data.tmr_len = SEV_ES_TMR_SIZE;
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}
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return __sev_do_cmd_locked(SEV_CMD_INIT, &data, error);
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}
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static int __sev_init_ex_locked(int *error)
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{
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struct sev_data_init_ex data;
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memset(&data, 0, sizeof(data));
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data.length = sizeof(data);
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data.nv_address = __psp_pa(sev_init_ex_buffer);
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data.nv_len = NV_LENGTH;
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if (sev_es_tmr) {
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/*
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* Do not include the encryption mask on the physical
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* address of the TMR (firmware should clear it anyway).
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*/
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data.tmr_address = __pa(sev_es_tmr);
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data.flags |= SEV_INIT_FLAGS_SEV_ES;
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data.tmr_len = SEV_ES_TMR_SIZE;
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}
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return __sev_do_cmd_locked(SEV_CMD_INIT_EX, &data, error);
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}
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static int __sev_platform_init_locked(int *error)
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{
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int rc = 0, psp_ret = SEV_RET_NO_FW_CALL;
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struct psp_device *psp = psp_master;
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int (*init_function)(int *error);
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struct sev_device *sev;
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if (!psp || !psp->sev_data)
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return -ENODEV;
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sev = psp->sev_data;
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if (sev->state == SEV_STATE_INIT)
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return 0;
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if (sev_init_ex_buffer) {
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init_function = __sev_init_ex_locked;
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rc = sev_read_init_ex_file();
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if (rc)
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return rc;
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} else {
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init_function = __sev_init_locked;
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}
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rc = init_function(&psp_ret);
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if (rc && psp_ret == SEV_RET_SECURE_DATA_INVALID) {
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/*
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* Initialization command returned an integrity check failure
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* status code, meaning that firmware load and validation of SEV
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* related persistent data has failed. Retrying the
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* initialization function should succeed by replacing the state
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* with a reset state.
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*/
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dev_err(sev->dev,
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"SEV: retrying INIT command because of SECURE_DATA_INVALID error. Retrying once to reset PSP SEV state.");
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rc = init_function(&psp_ret);
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}
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if (error)
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*error = psp_ret;
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if (rc)
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return rc;
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|
|
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(sev->dev, "SEV firmware initialized\n");
|
|
|
|
dev_info(sev->dev, "SEV API:%d.%d build:%d\n", sev->api_major,
|
|
sev->api_minor, sev->build);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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)
|
|
{
|
|
struct psp_device *psp = psp_master;
|
|
struct sev_device *sev;
|
|
int ret;
|
|
|
|
if (!psp || !psp->sev_data)
|
|
return 0;
|
|
|
|
sev = psp->sev_data;
|
|
|
|
if (sev->state == SEV_STATE_UNINIT)
|
|
return 0;
|
|
|
|
ret = __sev_do_cmd_locked(SEV_CMD_SHUTDOWN, NULL, error);
|
|
if (ret)
|
|
return ret;
|
|
|
|
sev->state = SEV_STATE_UNINIT;
|
|
dev_dbg(sev->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)
|
|
{
|
|
struct sev_user_data_status data;
|
|
int rc;
|
|
|
|
rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, &data, error);
|
|
if (rc)
|
|
return rc;
|
|
|
|
*state = data.state;
|
|
return rc;
|
|
}
|
|
|
|
static int sev_ioctl_do_reset(struct sev_issue_cmd *argp, bool writable)
|
|
{
|
|
int state, rc;
|
|
|
|
if (!writable)
|
|
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;
|
|
int ret;
|
|
|
|
memset(&data, 0, sizeof(data));
|
|
|
|
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, bool writable)
|
|
{
|
|
struct sev_device *sev = psp_master->sev_data;
|
|
int rc;
|
|
|
|
if (!writable)
|
|
return -EPERM;
|
|
|
|
if (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, bool writable)
|
|
{
|
|
struct sev_device *sev = psp_master->sev_data;
|
|
struct sev_user_data_pek_csr input;
|
|
struct sev_data_pek_csr data;
|
|
void __user *input_address;
|
|
void *blob = NULL;
|
|
int ret;
|
|
|
|
if (!writable)
|
|
return -EPERM;
|
|
|
|
if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
|
|
return -EFAULT;
|
|
|
|
memset(&data, 0, sizeof(data));
|
|
|
|
/* userspace wants to query CSR length */
|
|
if (!input.address || !input.length)
|
|
goto cmd;
|
|
|
|
/* allocate a physically contiguous buffer to store the CSR blob */
|
|
input_address = (void __user *)input.address;
|
|
if (input.length > SEV_FW_BLOB_MAX_SIZE)
|
|
return -EFAULT;
|
|
|
|
blob = kzalloc(input.length, GFP_KERNEL);
|
|
if (!blob)
|
|
return -ENOMEM;
|
|
|
|
data.address = __psp_pa(blob);
|
|
data.len = input.length;
|
|
|
|
cmd:
|
|
if (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(input_address, blob, input.length))
|
|
ret = -EFAULT;
|
|
}
|
|
|
|
e_free_blob:
|
|
kfree(blob);
|
|
return ret;
|
|
}
|
|
|
|
void *psp_copy_user_blob(u64 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 *)uaddr, len);
|
|
}
|
|
EXPORT_SYMBOL_GPL(psp_copy_user_blob);
|
|
|
|
static int sev_get_api_version(void)
|
|
{
|
|
struct sev_device *sev = psp_master->sev_data;
|
|
struct sev_user_data_status status;
|
|
int error = 0, ret;
|
|
|
|
ret = sev_platform_status(&status, &error);
|
|
if (ret) {
|
|
dev_err(sev->dev,
|
|
"SEV: failed to get status. Error: %#x\n", error);
|
|
return 1;
|
|
}
|
|
|
|
sev->api_major = status.api_major;
|
|
sev->api_minor = status.api_minor;
|
|
sev->build = status.build;
|
|
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_version_greater_or_equal(0, 15)) {
|
|
dev_dbg(dev, "DOWNLOAD_FIRMWARE not supported\n");
|
|
return -1;
|
|
}
|
|
|
|
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);
|
|
|
|
/*
|
|
* A quirk for fixing the committed TCB version, when upgrading from
|
|
* earlier firmware version than 1.50.
|
|
*/
|
|
if (!ret && !sev_version_greater_or_equal(1, 50))
|
|
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, bool writable)
|
|
{
|
|
struct sev_device *sev = psp_master->sev_data;
|
|
struct sev_user_data_pek_cert_import input;
|
|
struct sev_data_pek_cert_import data;
|
|
void *pek_blob, *oca_blob;
|
|
int ret;
|
|
|
|
if (!writable)
|
|
return -EPERM;
|
|
|
|
if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
|
|
return -EFAULT;
|
|
|
|
/* 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))
|
|
return PTR_ERR(pek_blob);
|
|
|
|
data.reserved = 0;
|
|
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 (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);
|
|
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 __user *input_address;
|
|
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;
|
|
|
|
input_address = (void __user *)input.address;
|
|
|
|
if (input.address && input.length) {
|
|
/*
|
|
* The length of the ID shouldn't be assumed by software since
|
|
* it may change in the future. The allocation size is limited
|
|
* to 1 << (PAGE_SHIFT + MAX_ORDER - 1) by the page allocator.
|
|
* If the allocation fails, simply return ENOMEM rather than
|
|
* warning in the kernel log.
|
|
*/
|
|
id_blob = kzalloc(input.length, GFP_KERNEL | __GFP_NOWARN);
|
|
if (!id_blob)
|
|
return -ENOMEM;
|
|
|
|
data.address = __psp_pa(id_blob);
|
|
data.len = input.length;
|
|
} else {
|
|
data.address = 0;
|
|
data.len = 0;
|
|
}
|
|
|
|
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(input_address, id_blob, data.len)) {
|
|
ret = -EFAULT;
|
|
goto e_free;
|
|
}
|
|
}
|
|
|
|
e_free:
|
|
kfree(id_blob);
|
|
|
|
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, bool writable)
|
|
{
|
|
struct sev_device *sev = psp_master->sev_data;
|
|
struct sev_user_data_pdh_cert_export input;
|
|
void *pdh_blob = NULL, *cert_blob = NULL;
|
|
struct sev_data_pdh_cert_export data;
|
|
void __user *input_cert_chain_address;
|
|
void __user *input_pdh_cert_address;
|
|
int ret;
|
|
|
|
/* If platform is not in INIT state then transition it to INIT. */
|
|
if (sev->state != SEV_STATE_INIT) {
|
|
if (!writable)
|
|
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;
|
|
|
|
memset(&data, 0, sizeof(data));
|
|
|
|
/* Userspace wants to query the certificate length. */
|
|
if (!input.pdh_cert_address ||
|
|
!input.pdh_cert_len ||
|
|
!input.cert_chain_address)
|
|
goto cmd;
|
|
|
|
input_pdh_cert_address = (void __user *)input.pdh_cert_address;
|
|
input_cert_chain_address = (void __user *)input.cert_chain_address;
|
|
|
|
/* Allocate a physically contiguous buffer to store the PDH blob. */
|
|
if (input.pdh_cert_len > SEV_FW_BLOB_MAX_SIZE)
|
|
return -EFAULT;
|
|
|
|
/* Allocate a physically contiguous buffer to store the cert chain blob. */
|
|
if (input.cert_chain_len > SEV_FW_BLOB_MAX_SIZE)
|
|
return -EFAULT;
|
|
|
|
pdh_blob = kzalloc(input.pdh_cert_len, GFP_KERNEL);
|
|
if (!pdh_blob)
|
|
return -ENOMEM;
|
|
|
|
data.pdh_cert_address = __psp_pa(pdh_blob);
|
|
data.pdh_cert_len = input.pdh_cert_len;
|
|
|
|
cert_blob = kzalloc(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(input_pdh_cert_address,
|
|
pdh_blob, input.pdh_cert_len)) {
|
|
ret = -EFAULT;
|
|
goto e_free_cert;
|
|
}
|
|
}
|
|
|
|
if (cert_blob) {
|
|
if (copy_to_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);
|
|
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;
|
|
bool writable = file->f_mode & FMODE_WRITE;
|
|
|
|
if (!psp_master || !psp_master->sev_data)
|
|
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, writable);
|
|
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, writable);
|
|
break;
|
|
case SEV_PDH_GEN:
|
|
ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PDH_GEN, &input, writable);
|
|
break;
|
|
case SEV_PEK_CSR:
|
|
ret = sev_ioctl_do_pek_csr(&input, writable);
|
|
break;
|
|
case SEV_PEK_CERT_IMPORT:
|
|
ret = sev_ioctl_do_pek_import(&input, writable);
|
|
break;
|
|
case SEV_PDH_CERT_EXPORT:
|
|
ret = sev_ioctl_do_pdh_export(&input, writable);
|
|
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)
|
|
{
|
|
misc_deregister(&misc_dev->misc);
|
|
kfree(misc_dev);
|
|
misc_dev = NULL;
|
|
}
|
|
|
|
static int sev_misc_init(struct sev_device *sev)
|
|
{
|
|
struct device *dev = sev->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 = kzalloc(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(&sev->int_queue);
|
|
sev->misc = misc_dev;
|
|
dev_dbg(dev, "registered SEV device\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sev_dev_init(struct psp_device *psp)
|
|
{
|
|
struct device *dev = psp->dev;
|
|
struct sev_device *sev;
|
|
int ret = -ENOMEM;
|
|
|
|
if (!boot_cpu_has(X86_FEATURE_SEV)) {
|
|
dev_info_once(dev, "SEV: memory encryption not enabled by BIOS\n");
|
|
return 0;
|
|
}
|
|
|
|
sev = devm_kzalloc(dev, sizeof(*sev), GFP_KERNEL);
|
|
if (!sev)
|
|
goto e_err;
|
|
|
|
sev->cmd_buf = (void *)devm_get_free_pages(dev, GFP_KERNEL, 0);
|
|
if (!sev->cmd_buf)
|
|
goto e_sev;
|
|
|
|
psp->sev_data = sev;
|
|
|
|
sev->dev = dev;
|
|
sev->psp = psp;
|
|
|
|
sev->io_regs = psp->io_regs;
|
|
|
|
sev->vdata = (struct sev_vdata *)psp->vdata->sev;
|
|
if (!sev->vdata) {
|
|
ret = -ENODEV;
|
|
dev_err(dev, "sev: missing driver data\n");
|
|
goto e_buf;
|
|
}
|
|
|
|
psp_set_sev_irq_handler(psp, sev_irq_handler, sev);
|
|
|
|
ret = sev_misc_init(sev);
|
|
if (ret)
|
|
goto e_irq;
|
|
|
|
dev_notice(dev, "sev enabled\n");
|
|
|
|
return 0;
|
|
|
|
e_irq:
|
|
psp_clear_sev_irq_handler(psp);
|
|
e_buf:
|
|
devm_free_pages(dev, (unsigned long)sev->cmd_buf);
|
|
e_sev:
|
|
devm_kfree(dev, sev);
|
|
e_err:
|
|
psp->sev_data = NULL;
|
|
|
|
dev_notice(dev, "sev initialization failed\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void sev_firmware_shutdown(struct sev_device *sev)
|
|
{
|
|
sev_platform_shutdown(NULL);
|
|
|
|
if (sev_es_tmr) {
|
|
/* The TMR area was encrypted, flush it from the cache */
|
|
wbinvd_on_all_cpus();
|
|
|
|
free_pages((unsigned long)sev_es_tmr,
|
|
get_order(SEV_ES_TMR_SIZE));
|
|
sev_es_tmr = NULL;
|
|
}
|
|
|
|
if (sev_init_ex_buffer) {
|
|
free_pages((unsigned long)sev_init_ex_buffer,
|
|
get_order(NV_LENGTH));
|
|
sev_init_ex_buffer = NULL;
|
|
}
|
|
}
|
|
|
|
void sev_dev_destroy(struct psp_device *psp)
|
|
{
|
|
struct sev_device *sev = psp->sev_data;
|
|
|
|
if (!sev)
|
|
return;
|
|
|
|
sev_firmware_shutdown(sev);
|
|
|
|
if (sev->misc)
|
|
kref_put(&misc_dev->refcount, sev_exit);
|
|
|
|
psp_clear_sev_irq_handler(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 sev_pci_init(void)
|
|
{
|
|
struct sev_device *sev = psp_master->sev_data;
|
|
int error, rc;
|
|
|
|
if (!sev)
|
|
return;
|
|
|
|
psp_timeout = psp_probe_timeout;
|
|
|
|
if (sev_get_api_version())
|
|
goto err;
|
|
|
|
if (sev_update_firmware(sev->dev) == 0)
|
|
sev_get_api_version();
|
|
|
|
/* If an init_ex_path is provided rely on INIT_EX for PSP initialization
|
|
* instead of INIT.
|
|
*/
|
|
if (init_ex_path) {
|
|
sev_init_ex_buffer = sev_fw_alloc(NV_LENGTH);
|
|
if (!sev_init_ex_buffer) {
|
|
dev_err(sev->dev,
|
|
"SEV: INIT_EX NV memory allocation failed\n");
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
/* Obtain the TMR memory area for SEV-ES use */
|
|
sev_es_tmr = sev_fw_alloc(SEV_ES_TMR_SIZE);
|
|
if (sev_es_tmr)
|
|
/* Must flush the cache before giving it to the firmware */
|
|
clflush_cache_range(sev_es_tmr, SEV_ES_TMR_SIZE);
|
|
else
|
|
dev_warn(sev->dev,
|
|
"SEV: TMR allocation failed, SEV-ES support unavailable\n");
|
|
|
|
if (!psp_init_on_probe)
|
|
return;
|
|
|
|
/* Initialize the platform */
|
|
rc = sev_platform_init(&error);
|
|
if (rc)
|
|
dev_err(sev->dev, "SEV: failed to INIT error %#x, rc %d\n",
|
|
error, rc);
|
|
|
|
return;
|
|
|
|
err:
|
|
psp_master->sev_data = NULL;
|
|
}
|
|
|
|
void sev_pci_exit(void)
|
|
{
|
|
struct sev_device *sev = psp_master->sev_data;
|
|
|
|
if (!sev)
|
|
return;
|
|
|
|
sev_firmware_shutdown(sev);
|
|
}
|