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 43 static void pc_isa_bios_init(PCMachineState *pcms, MemoryRegion *isa_bios, 44 MemoryRegion *rom_memory, 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 if (machine_require_guest_memfd(MACHINE(pcms))) { 55 memory_region_init_ram_guest_memfd(isa_bios, NULL, "isa-bios", 56 isa_bios_size, &error_fatal); 57 } else { 58 memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size, 59 &error_fatal); 60 } 61 memory_region_add_subregion_overlap(rom_memory, 62 0x100000 - isa_bios_size, 63 isa_bios, 64 1); 65 66 /* copy ISA rom image from top of flash memory */ 67 flash_ptr = memory_region_get_ram_ptr(flash_mem); 68 isa_bios_ptr = memory_region_get_ram_ptr(isa_bios); 69 memcpy(isa_bios_ptr, 70 ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size), 71 isa_bios_size); 72 73 if (!machine_require_guest_memfd(current_machine)) { 74 memory_region_set_readonly(isa_bios, true); 75 } 76 } 77 78 static PFlashCFI01 *pc_pflash_create(PCMachineState *pcms, 79 const char *name, 80 const char *alias_prop_name) 81 { 82 DeviceState *dev = qdev_new(TYPE_PFLASH_CFI01); 83 84 qdev_prop_set_uint64(dev, "sector-length", FLASH_SECTOR_SIZE); 85 qdev_prop_set_uint8(dev, "width", 1); 86 qdev_prop_set_string(dev, "name", name); 87 object_property_add_child(OBJECT(pcms), name, OBJECT(dev)); 88 object_property_add_alias(OBJECT(pcms), alias_prop_name, 89 OBJECT(dev), "drive"); 90 /* 91 * The returned reference is tied to the child property and 92 * will be removed with object_unparent. 93 */ 94 object_unref(OBJECT(dev)); 95 return PFLASH_CFI01(dev); 96 } 97 98 void pc_system_flash_create(PCMachineState *pcms) 99 { 100 PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms); 101 102 if (pcmc->pci_enabled) { 103 pcms->flash[0] = pc_pflash_create(pcms, "system.flash0", 104 "pflash0"); 105 pcms->flash[1] = pc_pflash_create(pcms, "system.flash1", 106 "pflash1"); 107 } 108 } 109 110 void pc_system_flash_cleanup_unused(PCMachineState *pcms) 111 { 112 char *prop_name; 113 int i; 114 115 assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled); 116 117 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { 118 if (!qdev_is_realized(DEVICE(pcms->flash[i]))) { 119 prop_name = g_strdup_printf("pflash%d", i); 120 object_property_del(OBJECT(pcms), prop_name); 121 g_free(prop_name); 122 object_unparent(OBJECT(pcms->flash[i])); 123 pcms->flash[i] = NULL; 124 } 125 } 126 } 127 128 /* 129 * Map the pcms->flash[] from 4GiB downward, and realize. 130 * Map them in descending order, i.e. pcms->flash[0] at the top, 131 * without gaps. 132 * Stop at the first pcms->flash[0] lacking a block backend. 133 * Set each flash's size from its block backend. Fatal error if the 134 * size isn't a non-zero multiple of 4KiB, or the total size exceeds 135 * pcms->max_fw_size. 136 * 137 * If pcms->flash[0] has a block backend, its memory is passed to 138 * pc_isa_bios_init(). Merging several flash devices for isa-bios is 139 * not supported. 140 */ 141 static void pc_system_flash_map(PCMachineState *pcms, 142 MemoryRegion *rom_memory) 143 { 144 X86MachineState *x86ms = X86_MACHINE(pcms); 145 PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms); 146 hwaddr total_size = 0; 147 int i; 148 BlockBackend *blk; 149 int64_t size; 150 PFlashCFI01 *system_flash; 151 MemoryRegion *flash_mem; 152 void *flash_ptr; 153 int flash_size; 154 155 assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled); 156 157 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { 158 hwaddr gpa; 159 160 system_flash = pcms->flash[i]; 161 blk = pflash_cfi01_get_blk(system_flash); 162 if (!blk) { 163 break; 164 } 165 size = blk_getlength(blk); 166 if (size < 0) { 167 error_report("can't get size of block device %s: %s", 168 blk_name(blk), strerror(-size)); 169 exit(1); 170 } 171 if (size == 0 || !QEMU_IS_ALIGNED(size, FLASH_SECTOR_SIZE)) { 172 error_report("system firmware block device %s has invalid size " 173 "%" PRId64, 174 blk_name(blk), size); 175 info_report("its size must be a non-zero multiple of 0x%x", 176 FLASH_SECTOR_SIZE); 177 exit(1); 178 } 179 if ((hwaddr)size != size 180 || total_size > HWADDR_MAX - size 181 || total_size + size > pcms->max_fw_size) { 182 error_report("combined size of system firmware exceeds " 183 "%" PRIu64 " bytes", 184 pcms->max_fw_size); 185 exit(1); 186 } 187 188 total_size += size; 189 gpa = 0x100000000ULL - total_size; /* where the flash is mapped */ 190 qdev_prop_set_uint32(DEVICE(system_flash), "num-blocks", 191 size / FLASH_SECTOR_SIZE); 192 sysbus_realize_and_unref(SYS_BUS_DEVICE(system_flash), &error_fatal); 193 sysbus_mmio_map(SYS_BUS_DEVICE(system_flash), 0, gpa); 194 195 if (i == 0) { 196 flash_mem = pflash_cfi01_get_memory(system_flash); 197 if (pcmc->isa_bios_alias) { 198 x86_isa_bios_init(&x86ms->isa_bios, rom_memory, flash_mem, 199 true); 200 } else { 201 pc_isa_bios_init(pcms, &x86ms->isa_bios, rom_memory, flash_mem); 202 } 203 204 /* Encrypt the pflash boot ROM */ 205 if (sev_enabled()) { 206 flash_ptr = memory_region_get_ram_ptr(flash_mem); 207 flash_size = memory_region_size(flash_mem); 208 x86_firmware_configure(gpa, flash_ptr, flash_size); 209 } 210 } 211 } 212 } 213 214 void pc_system_firmware_init(PCMachineState *pcms, 215 MemoryRegion *rom_memory) 216 { 217 PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms); 218 int i; 219 BlockBackend *pflash_blk[ARRAY_SIZE(pcms->flash)]; 220 221 if (!pcmc->pci_enabled) { 222 x86_bios_rom_init(X86_MACHINE(pcms), "bios.bin", rom_memory, true); 223 return; 224 } 225 226 /* Map legacy -drive if=pflash to machine properties */ 227 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { 228 pflash_cfi01_legacy_drive(pcms->flash[i], 229 drive_get(IF_PFLASH, 0, i)); 230 pflash_blk[i] = pflash_cfi01_get_blk(pcms->flash[i]); 231 } 232 233 /* Reject gaps */ 234 for (i = 1; i < ARRAY_SIZE(pcms->flash); i++) { 235 if (pflash_blk[i] && !pflash_blk[i - 1]) { 236 error_report("pflash%d requires pflash%d", i, i - 1); 237 exit(1); 238 } 239 } 240 241 if (!pflash_blk[0]) { 242 /* Machine property pflash0 not set, use ROM mode */ 243 x86_bios_rom_init(X86_MACHINE(pcms), "bios.bin", rom_memory, false); 244 } else { 245 if (kvm_enabled() && !kvm_readonly_mem_enabled()) { 246 /* 247 * Older KVM cannot execute from device memory. So, flash 248 * memory cannot be used unless the readonly memory kvm 249 * capability is present. 250 */ 251 error_report("pflash with kvm requires KVM readonly memory support"); 252 exit(1); 253 } 254 255 pc_system_flash_map(pcms, rom_memory); 256 } 257 258 pc_system_flash_cleanup_unused(pcms); 259 } 260 261 void x86_firmware_configure(hwaddr gpa, void *ptr, int size) 262 { 263 int ret; 264 265 /* 266 * OVMF places a GUIDed structures in the flash, so 267 * search for them 268 */ 269 pc_system_parse_ovmf_flash(ptr, size); 270 271 if (sev_enabled()) { 272 273 /* Copy the SEV metadata table (if it exists) */ 274 pc_system_parse_sev_metadata(ptr, size); 275 276 ret = sev_es_save_reset_vector(ptr, size); 277 if (ret) { 278 error_report("failed to locate and/or save reset vector"); 279 exit(1); 280 } 281 282 sev_encrypt_flash(gpa, ptr, size, &error_fatal); 283 } 284 } 285