1 /*
2 * QEMU PC System Firmware
3 *
4 * Copyright (c) 2003-2004 Fabrice Bellard
5 * Copyright (c) 2011-2012 Intel Corporation
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
23 * THE SOFTWARE.
24 */
25
26 #include "qemu/osdep.h"
27 #include "qapi/error.h"
28 #include "sysemu/block-backend.h"
29 #include "qemu/error-report.h"
30 #include "qemu/option.h"
31 #include "qemu/units.h"
32 #include "hw/sysbus.h"
33 #include "hw/i386/x86.h"
34 #include "hw/i386/pc.h"
35 #include "hw/loader.h"
36 #include "hw/qdev-properties.h"
37 #include "hw/block/flash.h"
38 #include "sysemu/kvm.h"
39 #include "sev.h"
40
41 #define FLASH_SECTOR_SIZE 4096
42
pc_isa_bios_init(MemoryRegion * isa_bios,MemoryRegion * rom_memory,MemoryRegion * flash_mem)43 static void pc_isa_bios_init(MemoryRegion *isa_bios, MemoryRegion *rom_memory,
44 MemoryRegion *flash_mem)
45 {
46 int isa_bios_size;
47 uint64_t flash_size;
48 void *flash_ptr, *isa_bios_ptr;
49
50 flash_size = memory_region_size(flash_mem);
51
52 /* map the last 128KB of the BIOS in ISA space */
53 isa_bios_size = MIN(flash_size, 128 * KiB);
54 memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size,
55 &error_fatal);
56 memory_region_add_subregion_overlap(rom_memory,
57 0x100000 - isa_bios_size,
58 isa_bios,
59 1);
60
61 /* copy ISA rom image from top of flash memory */
62 flash_ptr = memory_region_get_ram_ptr(flash_mem);
63 isa_bios_ptr = memory_region_get_ram_ptr(isa_bios);
64 memcpy(isa_bios_ptr,
65 ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size),
66 isa_bios_size);
67
68 memory_region_set_readonly(isa_bios, true);
69 }
70
pc_pflash_create(PCMachineState * pcms,const char * name,const char * alias_prop_name)71 static PFlashCFI01 *pc_pflash_create(PCMachineState *pcms,
72 const char *name,
73 const char *alias_prop_name)
74 {
75 DeviceState *dev = qdev_new(TYPE_PFLASH_CFI01);
76
77 qdev_prop_set_uint64(dev, "sector-length", FLASH_SECTOR_SIZE);
78 qdev_prop_set_uint8(dev, "width", 1);
79 qdev_prop_set_string(dev, "name", name);
80 object_property_add_child(OBJECT(pcms), name, OBJECT(dev));
81 object_property_add_alias(OBJECT(pcms), alias_prop_name,
82 OBJECT(dev), "drive");
83 /*
84 * The returned reference is tied to the child property and
85 * will be removed with object_unparent.
86 */
87 object_unref(OBJECT(dev));
88 return PFLASH_CFI01(dev);
89 }
90
pc_system_flash_create(PCMachineState * pcms)91 void pc_system_flash_create(PCMachineState *pcms)
92 {
93 PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
94
95 if (pcmc->pci_enabled) {
96 pcms->flash[0] = pc_pflash_create(pcms, "system.flash0",
97 "pflash0");
98 pcms->flash[1] = pc_pflash_create(pcms, "system.flash1",
99 "pflash1");
100 }
101 }
102
pc_system_flash_cleanup_unused(PCMachineState * pcms)103 void pc_system_flash_cleanup_unused(PCMachineState *pcms)
104 {
105 char *prop_name;
106 int i;
107
108 assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled);
109
110 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) {
111 if (!qdev_is_realized(DEVICE(pcms->flash[i]))) {
112 prop_name = g_strdup_printf("pflash%d", i);
113 object_property_del(OBJECT(pcms), prop_name);
114 g_free(prop_name);
115 object_unparent(OBJECT(pcms->flash[i]));
116 pcms->flash[i] = NULL;
117 }
118 }
119 }
120
121 /*
122 * Map the pcms->flash[] from 4GiB downward, and realize.
123 * Map them in descending order, i.e. pcms->flash[0] at the top,
124 * without gaps.
125 * Stop at the first pcms->flash[0] lacking a block backend.
126 * Set each flash's size from its block backend. Fatal error if the
127 * size isn't a non-zero multiple of 4KiB, or the total size exceeds
128 * pcms->max_fw_size.
129 *
130 * If pcms->flash[0] has a block backend, its memory is passed to
131 * pc_isa_bios_init(). Merging several flash devices for isa-bios is
132 * not supported.
133 */
pc_system_flash_map(PCMachineState * pcms,MemoryRegion * rom_memory)134 static void pc_system_flash_map(PCMachineState *pcms,
135 MemoryRegion *rom_memory)
136 {
137 X86MachineState *x86ms = X86_MACHINE(pcms);
138 hwaddr total_size = 0;
139 int i;
140 BlockBackend *blk;
141 int64_t size;
142 PFlashCFI01 *system_flash;
143 MemoryRegion *flash_mem;
144 void *flash_ptr;
145 int flash_size;
146
147 assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled);
148
149 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) {
150 system_flash = pcms->flash[i];
151 blk = pflash_cfi01_get_blk(system_flash);
152 if (!blk) {
153 break;
154 }
155 size = blk_getlength(blk);
156 if (size < 0) {
157 error_report("can't get size of block device %s: %s",
158 blk_name(blk), strerror(-size));
159 exit(1);
160 }
161 if (size == 0 || !QEMU_IS_ALIGNED(size, FLASH_SECTOR_SIZE)) {
162 error_report("system firmware block device %s has invalid size "
163 "%" PRId64,
164 blk_name(blk), size);
165 info_report("its size must be a non-zero multiple of 0x%x",
166 FLASH_SECTOR_SIZE);
167 exit(1);
168 }
169 if ((hwaddr)size != size
170 || total_size > HWADDR_MAX - size
171 || total_size + size > pcms->max_fw_size) {
172 error_report("combined size of system firmware exceeds "
173 "%" PRIu64 " bytes",
174 pcms->max_fw_size);
175 exit(1);
176 }
177
178 total_size += size;
179 qdev_prop_set_uint32(DEVICE(system_flash), "num-blocks",
180 size / FLASH_SECTOR_SIZE);
181 sysbus_realize_and_unref(SYS_BUS_DEVICE(system_flash), &error_fatal);
182 sysbus_mmio_map(SYS_BUS_DEVICE(system_flash), 0,
183 0x100000000ULL - total_size);
184
185 if (i == 0) {
186 flash_mem = pflash_cfi01_get_memory(system_flash);
187 pc_isa_bios_init(&x86ms->isa_bios, rom_memory, flash_mem);
188
189 /* Encrypt the pflash boot ROM */
190 if (sev_enabled()) {
191 flash_ptr = memory_region_get_ram_ptr(flash_mem);
192 flash_size = memory_region_size(flash_mem);
193 x86_firmware_configure(flash_ptr, flash_size);
194 }
195 }
196 }
197 }
198
pc_system_firmware_init(PCMachineState * pcms,MemoryRegion * rom_memory)199 void pc_system_firmware_init(PCMachineState *pcms,
200 MemoryRegion *rom_memory)
201 {
202 PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
203 int i;
204 BlockBackend *pflash_blk[ARRAY_SIZE(pcms->flash)];
205
206 if (!pcmc->pci_enabled) {
207 x86_bios_rom_init(X86_MACHINE(pcms), "bios.bin", rom_memory, true);
208 return;
209 }
210
211 /* Map legacy -drive if=pflash to machine properties */
212 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) {
213 pflash_cfi01_legacy_drive(pcms->flash[i],
214 drive_get(IF_PFLASH, 0, i));
215 pflash_blk[i] = pflash_cfi01_get_blk(pcms->flash[i]);
216 }
217
218 /* Reject gaps */
219 for (i = 1; i < ARRAY_SIZE(pcms->flash); i++) {
220 if (pflash_blk[i] && !pflash_blk[i - 1]) {
221 error_report("pflash%d requires pflash%d", i, i - 1);
222 exit(1);
223 }
224 }
225
226 if (!pflash_blk[0]) {
227 /* Machine property pflash0 not set, use ROM mode */
228 x86_bios_rom_init(X86_MACHINE(pcms), "bios.bin", rom_memory, false);
229 } else {
230 if (kvm_enabled() && !kvm_readonly_mem_enabled()) {
231 /*
232 * Older KVM cannot execute from device memory. So, flash
233 * memory cannot be used unless the readonly memory kvm
234 * capability is present.
235 */
236 error_report("pflash with kvm requires KVM readonly memory support");
237 exit(1);
238 }
239
240 pc_system_flash_map(pcms, rom_memory);
241 }
242
243 pc_system_flash_cleanup_unused(pcms);
244 }
245
x86_firmware_configure(void * ptr,int size)246 void x86_firmware_configure(void *ptr, int size)
247 {
248 int ret;
249
250 /*
251 * OVMF places a GUIDed structures in the flash, so
252 * search for them
253 */
254 pc_system_parse_ovmf_flash(ptr, size);
255
256 if (sev_enabled()) {
257 ret = sev_es_save_reset_vector(ptr, size);
258 if (ret) {
259 error_report("failed to locate and/or save reset vector");
260 exit(1);
261 }
262
263 sev_encrypt_flash(ptr, size, &error_fatal);
264 }
265 }
266