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(MemoryRegion *rom_memory, 44 MemoryRegion *flash_mem, 45 int ram_size) 46 { 47 int isa_bios_size; 48 MemoryRegion *isa_bios; 49 uint64_t flash_size; 50 void *flash_ptr, *isa_bios_ptr; 51 52 flash_size = memory_region_size(flash_mem); 53 54 /* map the last 128KB of the BIOS in ISA space */ 55 isa_bios_size = MIN(flash_size, 128 * KiB); 56 isa_bios = g_malloc(sizeof(*isa_bios)); 57 memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size, 58 &error_fatal); 59 memory_region_add_subregion_overlap(rom_memory, 60 0x100000 - isa_bios_size, 61 isa_bios, 62 1); 63 64 /* copy ISA rom image from top of flash memory */ 65 flash_ptr = memory_region_get_ram_ptr(flash_mem); 66 isa_bios_ptr = memory_region_get_ram_ptr(isa_bios); 67 memcpy(isa_bios_ptr, 68 ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size), 69 isa_bios_size); 70 71 memory_region_set_readonly(isa_bios, true); 72 } 73 74 static PFlashCFI01 *pc_pflash_create(PCMachineState *pcms, 75 const char *name, 76 const char *alias_prop_name) 77 { 78 DeviceState *dev = qdev_new(TYPE_PFLASH_CFI01); 79 80 qdev_prop_set_uint64(dev, "sector-length", FLASH_SECTOR_SIZE); 81 qdev_prop_set_uint8(dev, "width", 1); 82 qdev_prop_set_string(dev, "name", name); 83 object_property_add_child(OBJECT(pcms), name, OBJECT(dev)); 84 object_property_add_alias(OBJECT(pcms), alias_prop_name, 85 OBJECT(dev), "drive"); 86 /* 87 * The returned reference is tied to the child property and 88 * will be removed with object_unparent. 89 */ 90 object_unref(OBJECT(dev)); 91 return PFLASH_CFI01(dev); 92 } 93 94 static void pc_system_flash_cleanup_unused(PCMachineState *pcms) 95 { 96 char *prop_name; 97 int i; 98 99 assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled); 100 101 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { 102 if (!qdev_is_realized(DEVICE(pcms->flash[i]))) { 103 prop_name = g_strdup_printf("pflash%d", i); 104 object_property_del(OBJECT(pcms), prop_name); 105 g_free(prop_name); 106 object_unparent(OBJECT(pcms->flash[i])); 107 pcms->flash[i] = NULL; 108 } 109 } 110 } 111 112 /* 113 * Map the pcms->flash[] from 4GiB downward, and realize. 114 * Map them in descending order, i.e. pcms->flash[0] at the top, 115 * without gaps. 116 * Stop at the first pcms->flash[0] lacking a block backend. 117 * Set each flash's size from its block backend. Fatal error if the 118 * size isn't a non-zero multiple of 4KiB, or the total size exceeds 119 * pcms->max_fw_size. 120 * 121 * If pcms->flash[0] has a block backend, its memory is passed to 122 * pc_isa_bios_init(). Merging several flash devices for isa-bios is 123 * not supported. 124 */ 125 static void pc_system_flash_map(PCMachineState *pcms, 126 MemoryRegion *rom_memory) 127 { 128 hwaddr total_size = 0; 129 int i; 130 BlockBackend *blk; 131 int64_t size; 132 PFlashCFI01 *system_flash; 133 MemoryRegion *flash_mem; 134 void *flash_ptr; 135 int flash_size; 136 137 assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled); 138 139 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { 140 system_flash = pcms->flash[i]; 141 blk = pflash_cfi01_get_blk(system_flash); 142 if (!blk) { 143 break; 144 } 145 size = blk_getlength(blk); 146 if (size < 0) { 147 error_report("can't get size of block device %s: %s", 148 blk_name(blk), strerror(-size)); 149 exit(1); 150 } 151 if (size == 0 || !QEMU_IS_ALIGNED(size, FLASH_SECTOR_SIZE)) { 152 error_report("system firmware block device %s has invalid size " 153 "%" PRId64, 154 blk_name(blk), size); 155 info_report("its size must be a non-zero multiple of 0x%x", 156 FLASH_SECTOR_SIZE); 157 exit(1); 158 } 159 if ((hwaddr)size != size 160 || total_size > HWADDR_MAX - size 161 || total_size + size > pcms->max_fw_size) { 162 error_report("combined size of system firmware exceeds " 163 "%" PRIu64 " bytes", 164 pcms->max_fw_size); 165 exit(1); 166 } 167 168 total_size += size; 169 qdev_prop_set_uint32(DEVICE(system_flash), "num-blocks", 170 size / FLASH_SECTOR_SIZE); 171 sysbus_realize_and_unref(SYS_BUS_DEVICE(system_flash), &error_fatal); 172 sysbus_mmio_map(SYS_BUS_DEVICE(system_flash), 0, 173 0x100000000ULL - total_size); 174 175 if (i == 0) { 176 flash_mem = pflash_cfi01_get_memory(system_flash); 177 pc_isa_bios_init(rom_memory, flash_mem, size); 178 179 /* Encrypt the pflash boot ROM */ 180 if (sev_enabled()) { 181 flash_ptr = memory_region_get_ram_ptr(flash_mem); 182 flash_size = memory_region_size(flash_mem); 183 x86_firmware_configure(flash_ptr, flash_size); 184 } 185 } 186 } 187 } 188 189 void pc_system_firmware_init(PCMachineState *pcms, 190 MemoryRegion *rom_memory) 191 { 192 PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms); 193 int i; 194 BlockBackend *pflash_blk[ARRAY_SIZE(pcms->flash)]; 195 196 if (!pcmc->pci_enabled) { 197 x86_bios_rom_init(MACHINE(pcms), "bios.bin", rom_memory, true); 198 return; 199 } 200 201 pcms->flash[0] = pc_pflash_create(pcms, "system.flash0", "pflash0"); 202 pcms->flash[1] = pc_pflash_create(pcms, "system.flash1", "pflash1"); 203 204 /* Map legacy -drive if=pflash to machine properties */ 205 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { 206 pflash_cfi01_legacy_drive(pcms->flash[i], 207 drive_get(IF_PFLASH, 0, i)); 208 pflash_blk[i] = pflash_cfi01_get_blk(pcms->flash[i]); 209 } 210 211 /* Reject gaps */ 212 for (i = 1; i < ARRAY_SIZE(pcms->flash); i++) { 213 if (pflash_blk[i] && !pflash_blk[i - 1]) { 214 error_report("pflash%d requires pflash%d", i, i - 1); 215 exit(1); 216 } 217 } 218 219 if (!pflash_blk[0]) { 220 /* Machine property pflash0 not set, use ROM mode */ 221 x86_bios_rom_init(MACHINE(pcms), "bios.bin", rom_memory, false); 222 } else { 223 if (kvm_enabled() && !kvm_readonly_mem_enabled()) { 224 /* 225 * Older KVM cannot execute from device memory. So, flash 226 * memory cannot be used unless the readonly memory kvm 227 * capability is present. 228 */ 229 error_report("pflash with kvm requires KVM readonly memory support"); 230 exit(1); 231 } 232 233 pc_system_flash_map(pcms, rom_memory); 234 } 235 236 pc_system_flash_cleanup_unused(pcms); 237 } 238 239 void x86_firmware_configure(void *ptr, int size) 240 { 241 int ret; 242 243 /* 244 * OVMF places a GUIDed structures in the flash, so 245 * search for them 246 */ 247 pc_system_parse_ovmf_flash(ptr, size); 248 249 if (sev_enabled()) { 250 ret = sev_es_save_reset_vector(ptr, size); 251 if (ret) { 252 error_report("failed to locate and/or save reset vector"); 253 exit(1); 254 } 255 256 sev_encrypt_flash(ptr, size, &error_fatal); 257 } 258 } 259