diff options
Diffstat (limited to 'drivers/crypto/ccp/psp-dev.c')
| -rw-r--r-- | drivers/crypto/ccp/psp-dev.c | 1042 |
1 files changed, 86 insertions, 956 deletions
diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c index 7ca2d3408e7a..e95e7aa5dbf1 100644 --- a/drivers/crypto/ccp/psp-dev.c +++ b/drivers/crypto/ccp/psp-dev.c @@ -2,57 +2,20 @@ /* * AMD Platform Security Processor (PSP) interface * - * Copyright (C) 2016,2018 Advanced Micro Devices, Inc. + * Copyright (C) 2016,2019 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 <asm/smp.h> +#include <linux/irqreturn.h> #include "sp-dev.h" #include "psp-dev.h" +#include "sev-dev.h" +#include "tee-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; -} +struct psp_device *psp_master; static struct psp_device *psp_alloc_struct(struct sp_device *sp) { @@ -75,902 +38,95 @@ 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; + /* invoke subdevice interrupt handlers */ + if (status) { + if (psp->sev_irq_handler) + psp->sev_irq_handler(irq, psp->sev_irq_data, status); - /* 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); + if (psp->tee_irq_handler) + psp->tee_irq_handler(irq, psp->tee_irq_data, status); } -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) +static unsigned int psp_get_capability(struct psp_device *psp) { - 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; + unsigned int val = ioread32(psp->io_regs + psp->vdata->feature_reg); /* - * 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 + * 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 ((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)) + if (val == 0xffffffff) { + dev_notice(psp->dev, "psp: unable to access the device: you might be running a broken BIOS.\n"); 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; + return val; } -static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp) +static int psp_check_sev_support(struct psp_device *psp, + unsigned int capability) { - 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; + /* Check if device supports SEV feature */ + if (!(capability & 1)) { + dev_dbg(psp->dev, "psp does not support SEV\n"); + return -ENODEV; } - 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; + return 0; } -static int sev_ioctl_do_get_id2(struct sev_issue_cmd *argp) +static int psp_check_tee_support(struct psp_device *psp, + unsigned int capability) { - 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; - } + /* Check if device supports TEE feature */ + if (!(capability & 2)) { + dev_dbg(psp->dev, "psp does not support TEE\n"); + return -ENODEV; } -e_free: - kfree(id_blob); - kfree(data); - - return ret; + return 0; } -static int sev_ioctl_do_get_id(struct sev_issue_cmd *argp) +static int psp_check_support(struct psp_device *psp, + unsigned int capability) { - struct sev_data_get_id *data; - u64 data_size, user_size; - void *id_blob, *mem; - int ret; + int sev_support = psp_check_sev_support(psp, capability); + int tee_support = psp_check_tee_support(psp, capability); - /* 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 error if device neither supports SEV nor TEE */ + if (sev_support && tee_support) + return -ENODEV; - return ret; + return 0; } -static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp) +static int psp_init(struct psp_device *psp, unsigned int capability) { - 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 (!psp_check_sev_support(psp, capability)) { + ret = sev_dev_init(psp); 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 (!psp_check_tee_support(psp, capability)) { + ret = tee_dev_init(psp); 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; @@ -980,6 +136,7 @@ int psp_dev_init(struct sp_device *sp) { struct device *dev = sp->dev; struct psp_device *psp; + unsigned int capability; int ret; ret = -ENOMEM; @@ -998,7 +155,11 @@ int psp_dev_init(struct sp_device *sp) psp->io_regs = sp->io_map; - ret = psp_check_sev_support(psp); + capability = psp_get_capability(psp); + if (!capability) + goto e_disable; + + ret = psp_check_support(psp, capability); if (ret) goto e_disable; @@ -1013,7 +174,7 @@ int psp_dev_init(struct sp_device *sp) goto e_err; } - ret = sev_misc_init(psp); + ret = psp_init(psp, capability); if (ret) goto e_irq; @@ -1049,83 +210,52 @@ void psp_dev_destroy(struct sp_device *sp) if (!psp) return; - if (psp->sev_misc) - kref_put(&misc_dev->refcount, sev_exit); + sev_dev_destroy(psp); + + tee_dev_destroy(psp); sp_free_psp_irq(sp, psp); } -int sev_issue_cmd_external_user(struct file *filep, unsigned int cmd, - void *data, int *error) +void psp_set_sev_irq_handler(struct psp_device *psp, psp_irq_handler_t handler, + void *data) { - if (!filep || filep->f_op != &sev_fops) - return -EBADF; - - return sev_do_cmd(cmd, data, error); + psp->sev_irq_data = data; + psp->sev_irq_handler = handler; } -EXPORT_SYMBOL_GPL(sev_issue_cmd_external_user); -void psp_pci_init(void) +void psp_clear_sev_irq_handler(struct psp_device *psp) { - 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; + psp_set_sev_irq_handler(psp, NULL, NULL); +} - if (sev_get_api_version()) - goto err; +void psp_set_tee_irq_handler(struct psp_device *psp, psp_irq_handler_t handler, + void *data) +{ + psp->tee_irq_data = data; + psp->tee_irq_handler = handler; +} - /* - * 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. - */ +void psp_clear_tee_irq_handler(struct psp_device *psp) +{ + psp_set_tee_irq_handler(psp, NULL, NULL); +} - if (psp_master->sev_state != SEV_STATE_UNINIT) { - sev_platform_shutdown(NULL); - psp_master->sev_state = SEV_STATE_UNINIT; - } +struct psp_device *psp_get_master_device(void) +{ + struct sp_device *sp = sp_get_psp_master_device(); - if (sev_version_greater_or_equal(0, 15) && - sev_update_firmware(psp_master->dev) == 0) - sev_get_api_version(); + return sp ? sp->psp_data : NULL; +} - /* 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); - } +void psp_pci_init(void) +{ + psp_master = psp_get_master_device(); - if (rc) { - dev_err(sp->dev, "SEV: failed to INIT error %#x\n", error); + if (!psp_master) 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; + sev_pci_init(); } void psp_pci_exit(void) @@ -1133,5 +263,5 @@ void psp_pci_exit(void) if (!psp_master) return; - sev_platform_shutdown(NULL); + sev_pci_exit(); } |