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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 | // SPDX-License-Identifier: GPL-2.0 /* * Copyright (c) 2014 Oracle Co., Daniel Kiper */ #include <linux/bitops.h> #include <linux/efi.h> #include <linux/init.h> #include <linux/string.h> #include <xen/xen.h> #include <xen/xen-ops.h> #include <xen/interface/platform.h> #include <asm/page.h> #include <asm/setup.h> #include <asm/xen/hypercall.h> static efi_char16_t vendor[100] __initdata; static efi_system_table_t efi_systab_xen __initdata = { .hdr = { .signature = EFI_SYSTEM_TABLE_SIGNATURE, .revision = 0, /* Initialized later. */ .headersize = 0, /* Ignored by Linux Kernel. */ .crc32 = 0, /* Ignored by Linux Kernel. */ .reserved = 0 }, .fw_vendor = EFI_INVALID_TABLE_ADDR, /* Initialized later. */ .fw_revision = 0, /* Initialized later. */ .con_in_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */ .con_in = NULL, /* Not used under Xen. */ .con_out_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */ .con_out = NULL, /* Not used under Xen. */ .stderr_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */ .stderr = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */ .runtime = (efi_runtime_services_t *)EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */ .boottime = (efi_boot_services_t *)EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */ .nr_tables = 0, /* Initialized later. */ .tables = EFI_INVALID_TABLE_ADDR /* Initialized later. */ }; static efi_system_table_t __init *xen_efi_probe(void) { struct xen_platform_op op = { .cmd = XENPF_firmware_info, .u.firmware_info = { .type = XEN_FW_EFI_INFO, .index = XEN_FW_EFI_CONFIG_TABLE } }; union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info; if (!xen_initial_domain() || HYPERVISOR_platform_op(&op) < 0) return NULL; /* Here we know that Xen runs on EFI platform. */ xen_efi_runtime_setup(); efi_systab_xen.tables = info->cfg.addr; efi_systab_xen.nr_tables = info->cfg.nent; op.cmd = XENPF_firmware_info; op.u.firmware_info.type = XEN_FW_EFI_INFO; op.u.firmware_info.index = XEN_FW_EFI_VENDOR; info->vendor.bufsz = sizeof(vendor); set_xen_guest_handle(info->vendor.name, vendor); if (HYPERVISOR_platform_op(&op) == 0) { efi_systab_xen.fw_vendor = __pa_symbol(vendor); efi_systab_xen.fw_revision = info->vendor.revision; } else efi_systab_xen.fw_vendor = __pa_symbol(L"UNKNOWN"); op.cmd = XENPF_firmware_info; op.u.firmware_info.type = XEN_FW_EFI_INFO; op.u.firmware_info.index = XEN_FW_EFI_VERSION; if (HYPERVISOR_platform_op(&op) == 0) efi_systab_xen.hdr.revision = info->version; op.cmd = XENPF_firmware_info; op.u.firmware_info.type = XEN_FW_EFI_INFO; op.u.firmware_info.index = XEN_FW_EFI_RT_VERSION; if (HYPERVISOR_platform_op(&op) == 0) efi.runtime_version = info->version; return &efi_systab_xen; } /* * Determine whether we're in secure boot mode. * * Please keep the logic in sync with * drivers/firmware/efi/libstub/secureboot.c:efi_get_secureboot(). */ static enum efi_secureboot_mode xen_efi_get_secureboot(void) { static efi_guid_t efi_variable_guid = EFI_GLOBAL_VARIABLE_GUID; static efi_guid_t shim_guid = EFI_SHIM_LOCK_GUID; efi_status_t status; u8 moksbstate, secboot, setupmode; unsigned long size; size = sizeof(secboot); status = efi.get_variable(L"SecureBoot", &efi_variable_guid, NULL, &size, &secboot); if (status == EFI_NOT_FOUND) return efi_secureboot_mode_disabled; if (status != EFI_SUCCESS) goto out_efi_err; size = sizeof(setupmode); status = efi.get_variable(L"SetupMode", &efi_variable_guid, NULL, &size, &setupmode); if (status != EFI_SUCCESS) goto out_efi_err; if (secboot == 0 || setupmode == 1) return efi_secureboot_mode_disabled; /* See if a user has put the shim into insecure mode. */ size = sizeof(moksbstate); status = efi.get_variable(L"MokSBStateRT", &shim_guid, NULL, &size, &moksbstate); /* If it fails, we don't care why. Default to secure. */ if (status != EFI_SUCCESS) goto secure_boot_enabled; if (moksbstate == 1) return efi_secureboot_mode_disabled; secure_boot_enabled: pr_info("UEFI Secure Boot is enabled.\n"); return efi_secureboot_mode_enabled; out_efi_err: pr_err("Could not determine UEFI Secure Boot status.\n"); return efi_secureboot_mode_unknown; } void __init xen_efi_init(struct boot_params *boot_params) { efi_system_table_t *efi_systab_xen; efi_systab_xen = xen_efi_probe(); if (efi_systab_xen == NULL) return; strncpy((char *)&boot_params->efi_info.efi_loader_signature, "Xen", sizeof(boot_params->efi_info.efi_loader_signature)); boot_params->efi_info.efi_systab = (__u32)__pa(efi_systab_xen); boot_params->efi_info.efi_systab_hi = (__u32)(__pa(efi_systab_xen) >> 32); boot_params->secure_boot = xen_efi_get_secureboot(); set_bit(EFI_BOOT, &efi.flags); set_bit(EFI_PARAVIRT, &efi.flags); set_bit(EFI_64BIT, &efi.flags); } |