Commit | Line | Data |
---|---|---|
901d209a | 1 | // SPDX-License-Identifier: GPL-2.0 |
c7341d6a DK |
2 | /* |
3 | * Copyright (c) 2014 Oracle Co., Daniel Kiper | |
c7341d6a DK |
4 | */ |
5 | ||
342cd340 | 6 | #include <linux/bitops.h> |
c7341d6a DK |
7 | #include <linux/efi.h> |
8 | #include <linux/init.h> | |
9 | #include <linux/string.h> | |
10 | ||
a62ed500 | 11 | #include <xen/xen.h> |
c7341d6a | 12 | #include <xen/xen-ops.h> |
a62ed500 | 13 | #include <xen/interface/platform.h> |
c7341d6a | 14 | |
342cd340 | 15 | #include <asm/page.h> |
c7341d6a | 16 | #include <asm/setup.h> |
a62ed500 SZ |
17 | #include <asm/xen/hypercall.h> |
18 | ||
19 | static efi_char16_t vendor[100] __initdata; | |
20 | ||
21 | static efi_system_table_t efi_systab_xen __initdata = { | |
22 | .hdr = { | |
23 | .signature = EFI_SYSTEM_TABLE_SIGNATURE, | |
24 | .revision = 0, /* Initialized later. */ | |
25 | .headersize = 0, /* Ignored by Linux Kernel. */ | |
26 | .crc32 = 0, /* Ignored by Linux Kernel. */ | |
27 | .reserved = 0 | |
28 | }, | |
29 | .fw_vendor = EFI_INVALID_TABLE_ADDR, /* Initialized later. */ | |
30 | .fw_revision = 0, /* Initialized later. */ | |
31 | .con_in_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */ | |
32 | .con_in = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */ | |
33 | .con_out_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */ | |
34 | .con_out = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */ | |
35 | .stderr_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */ | |
36 | .stderr = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */ | |
37 | .runtime = (efi_runtime_services_t *)EFI_INVALID_TABLE_ADDR, | |
38 | /* Not used under Xen. */ | |
39 | .boottime = (efi_boot_services_t *)EFI_INVALID_TABLE_ADDR, | |
40 | /* Not used under Xen. */ | |
41 | .nr_tables = 0, /* Initialized later. */ | |
42 | .tables = EFI_INVALID_TABLE_ADDR /* Initialized later. */ | |
43 | }; | |
44 | ||
a62ed500 SZ |
45 | static efi_system_table_t __init *xen_efi_probe(void) |
46 | { | |
47 | struct xen_platform_op op = { | |
48 | .cmd = XENPF_firmware_info, | |
49 | .u.firmware_info = { | |
50 | .type = XEN_FW_EFI_INFO, | |
51 | .index = XEN_FW_EFI_CONFIG_TABLE | |
52 | } | |
53 | }; | |
54 | union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info; | |
55 | ||
56 | if (!xen_initial_domain() || HYPERVISOR_platform_op(&op) < 0) | |
57 | return NULL; | |
58 | ||
59 | /* Here we know that Xen runs on EFI platform. */ | |
09515706 | 60 | xen_efi_runtime_setup(); |
a62ed500 SZ |
61 | |
62 | efi_systab_xen.tables = info->cfg.addr; | |
63 | efi_systab_xen.nr_tables = info->cfg.nent; | |
64 | ||
65 | op.cmd = XENPF_firmware_info; | |
66 | op.u.firmware_info.type = XEN_FW_EFI_INFO; | |
67 | op.u.firmware_info.index = XEN_FW_EFI_VENDOR; | |
68 | info->vendor.bufsz = sizeof(vendor); | |
69 | set_xen_guest_handle(info->vendor.name, vendor); | |
70 | ||
71 | if (HYPERVISOR_platform_op(&op) == 0) { | |
72 | efi_systab_xen.fw_vendor = __pa_symbol(vendor); | |
73 | efi_systab_xen.fw_revision = info->vendor.revision; | |
74 | } else | |
75 | efi_systab_xen.fw_vendor = __pa_symbol(L"UNKNOWN"); | |
76 | ||
77 | op.cmd = XENPF_firmware_info; | |
78 | op.u.firmware_info.type = XEN_FW_EFI_INFO; | |
79 | op.u.firmware_info.index = XEN_FW_EFI_VERSION; | |
80 | ||
81 | if (HYPERVISOR_platform_op(&op) == 0) | |
82 | efi_systab_xen.hdr.revision = info->version; | |
83 | ||
84 | op.cmd = XENPF_firmware_info; | |
85 | op.u.firmware_info.type = XEN_FW_EFI_INFO; | |
86 | op.u.firmware_info.index = XEN_FW_EFI_RT_VERSION; | |
87 | ||
88 | if (HYPERVISOR_platform_op(&op) == 0) | |
89 | efi.runtime_version = info->version; | |
90 | ||
91 | return &efi_systab_xen; | |
92 | } | |
c7341d6a | 93 | |
a7012bdb DK |
94 | /* |
95 | * Determine whether we're in secure boot mode. | |
96 | * | |
97 | * Please keep the logic in sync with | |
98 | * drivers/firmware/efi/libstub/secureboot.c:efi_get_secureboot(). | |
99 | */ | |
100 | static enum efi_secureboot_mode xen_efi_get_secureboot(void) | |
101 | { | |
102 | static efi_guid_t efi_variable_guid = EFI_GLOBAL_VARIABLE_GUID; | |
103 | static efi_guid_t shim_guid = EFI_SHIM_LOCK_GUID; | |
104 | efi_status_t status; | |
105 | u8 moksbstate, secboot, setupmode; | |
106 | unsigned long size; | |
107 | ||
108 | size = sizeof(secboot); | |
109 | status = efi.get_variable(L"SecureBoot", &efi_variable_guid, | |
110 | NULL, &size, &secboot); | |
111 | ||
112 | if (status == EFI_NOT_FOUND) | |
113 | return efi_secureboot_mode_disabled; | |
114 | ||
115 | if (status != EFI_SUCCESS) | |
116 | goto out_efi_err; | |
117 | ||
118 | size = sizeof(setupmode); | |
119 | status = efi.get_variable(L"SetupMode", &efi_variable_guid, | |
120 | NULL, &size, &setupmode); | |
121 | ||
122 | if (status != EFI_SUCCESS) | |
123 | goto out_efi_err; | |
124 | ||
125 | if (secboot == 0 || setupmode == 1) | |
126 | return efi_secureboot_mode_disabled; | |
127 | ||
128 | /* See if a user has put the shim into insecure mode. */ | |
129 | size = sizeof(moksbstate); | |
130 | status = efi.get_variable(L"MokSBStateRT", &shim_guid, | |
131 | NULL, &size, &moksbstate); | |
132 | ||
133 | /* If it fails, we don't care why. Default to secure. */ | |
134 | if (status != EFI_SUCCESS) | |
135 | goto secure_boot_enabled; | |
136 | ||
137 | if (moksbstate == 1) | |
138 | return efi_secureboot_mode_disabled; | |
139 | ||
140 | secure_boot_enabled: | |
141 | pr_info("UEFI Secure Boot is enabled.\n"); | |
142 | return efi_secureboot_mode_enabled; | |
143 | ||
144 | out_efi_err: | |
145 | pr_err("Could not determine UEFI Secure Boot status.\n"); | |
146 | return efi_secureboot_mode_unknown; | |
147 | } | |
148 | ||
72813bfb | 149 | void __init xen_efi_init(struct boot_params *boot_params) |
c7341d6a DK |
150 | { |
151 | efi_system_table_t *efi_systab_xen; | |
152 | ||
153 | efi_systab_xen = xen_efi_probe(); | |
154 | ||
155 | if (efi_systab_xen == NULL) | |
156 | return; | |
157 | ||
72813bfb RPM |
158 | strncpy((char *)&boot_params->efi_info.efi_loader_signature, "Xen", |
159 | sizeof(boot_params->efi_info.efi_loader_signature)); | |
160 | boot_params->efi_info.efi_systab = (__u32)__pa(efi_systab_xen); | |
161 | boot_params->efi_info.efi_systab_hi = (__u32)(__pa(efi_systab_xen) >> 32); | |
c7341d6a | 162 | |
72813bfb | 163 | boot_params->secure_boot = xen_efi_get_secureboot(); |
a7012bdb | 164 | |
c7341d6a DK |
165 | set_bit(EFI_BOOT, &efi.flags); |
166 | set_bit(EFI_PARAVIRT, &efi.flags); | |
167 | set_bit(EFI_64BIT, &efi.flags); | |
168 | } |