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 void pc_system_flash_create(PCMachineState *pcms) 95 { 96 PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms); 97 98 if (pcmc->pci_enabled) { 99 pcms->flash[0] = pc_pflash_create(pcms, "system.flash0", 100 "pflash0"); 101 pcms->flash[1] = pc_pflash_create(pcms, "system.flash1", 102 "pflash1"); 103 } 104 } 105 106 void pc_system_flash_cleanup_unused(PCMachineState *pcms) 107 { 108 char *prop_name; 109 int i; 110 111 assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled); 112 113 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { 114 if (!qdev_is_realized(DEVICE(pcms->flash[i]))) { 115 prop_name = g_strdup_printf("pflash%d", i); 116 object_property_del(OBJECT(pcms), prop_name); 117 g_free(prop_name); 118 object_unparent(OBJECT(pcms->flash[i])); 119 pcms->flash[i] = NULL; 120 } 121 } 122 } 123 124 /* 125 * Map the pcms->flash[] from 4GiB downward, and realize. 126 * Map them in descending order, i.e. pcms->flash[0] at the top, 127 * without gaps. 128 * Stop at the first pcms->flash[0] lacking a block backend. 129 * Set each flash's size from its block backend. Fatal error if the 130 * size isn't a non-zero multiple of 4KiB, or the total size exceeds 131 * pcms->max_fw_size. 132 * 133 * If pcms->flash[0] has a block backend, its memory is passed to 134 * pc_isa_bios_init(). Merging several flash devices for isa-bios is 135 * not supported. 136 */ 137 static void pc_system_flash_map(PCMachineState *pcms, 138 MemoryRegion *rom_memory) 139 { 140 hwaddr total_size = 0; 141 int i; 142 BlockBackend *blk; 143 int64_t size; 144 PFlashCFI01 *system_flash; 145 MemoryRegion *flash_mem; 146 void *flash_ptr; 147 int flash_size; 148 149 assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled); 150 151 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { 152 system_flash = pcms->flash[i]; 153 blk = pflash_cfi01_get_blk(system_flash); 154 if (!blk) { 155 break; 156 } 157 size = blk_getlength(blk); 158 if (size < 0) { 159 error_report("can't get size of block device %s: %s", 160 blk_name(blk), strerror(-size)); 161 exit(1); 162 } 163 if (size == 0 || !QEMU_IS_ALIGNED(size, FLASH_SECTOR_SIZE)) { 164 error_report("system firmware block device %s has invalid size " 165 "%" PRId64, 166 blk_name(blk), size); 167 info_report("its size must be a non-zero multiple of 0x%x", 168 FLASH_SECTOR_SIZE); 169 exit(1); 170 } 171 if ((hwaddr)size != size 172 || total_size > HWADDR_MAX - size 173 || total_size + size > pcms->max_fw_size) { 174 error_report("combined size of system firmware exceeds " 175 "%" PRIu64 " bytes", 176 pcms->max_fw_size); 177 exit(1); 178 } 179 180 total_size += size; 181 qdev_prop_set_uint32(DEVICE(system_flash), "num-blocks", 182 size / FLASH_SECTOR_SIZE); 183 sysbus_realize_and_unref(SYS_BUS_DEVICE(system_flash), &error_fatal); 184 sysbus_mmio_map(SYS_BUS_DEVICE(system_flash), 0, 185 0x100000000ULL - total_size); 186 187 if (i == 0) { 188 flash_mem = pflash_cfi01_get_memory(system_flash); 189 pc_isa_bios_init(rom_memory, flash_mem, size); 190 191 /* Encrypt the pflash boot ROM */ 192 if (sev_enabled()) { 193 flash_ptr = memory_region_get_ram_ptr(flash_mem); 194 flash_size = memory_region_size(flash_mem); 195 x86_firmware_configure(flash_ptr, flash_size); 196 } 197 } 198 } 199 } 200 201 void pc_system_firmware_init(PCMachineState *pcms, 202 MemoryRegion *rom_memory) 203 { 204 PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms); 205 int i; 206 BlockBackend *pflash_blk[ARRAY_SIZE(pcms->flash)]; 207 208 if (!pcmc->pci_enabled) { 209 x86_bios_rom_init(MACHINE(pcms), "bios.bin", rom_memory, true); 210 return; 211 } 212 213 /* Map legacy -drive if=pflash to machine properties */ 214 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { 215 pflash_cfi01_legacy_drive(pcms->flash[i], 216 drive_get(IF_PFLASH, 0, i)); 217 pflash_blk[i] = pflash_cfi01_get_blk(pcms->flash[i]); 218 } 219 220 /* Reject gaps */ 221 for (i = 1; i < ARRAY_SIZE(pcms->flash); i++) { 222 if (pflash_blk[i] && !pflash_blk[i - 1]) { 223 error_report("pflash%d requires pflash%d", i, i - 1); 224 exit(1); 225 } 226 } 227 228 if (!pflash_blk[0]) { 229 /* Machine property pflash0 not set, use ROM mode */ 230 x86_bios_rom_init(MACHINE(pcms), "bios.bin", rom_memory, false); 231 } else { 232 if (kvm_enabled() && !kvm_readonly_mem_enabled()) { 233 /* 234 * Older KVM cannot execute from device memory. So, flash 235 * memory cannot be used unless the readonly memory kvm 236 * capability is present. 237 */ 238 error_report("pflash with kvm requires KVM readonly memory support"); 239 exit(1); 240 } 241 242 pc_system_flash_map(pcms, rom_memory); 243 } 244 245 pc_system_flash_cleanup_unused(pcms); 246 } 247 248 void x86_firmware_configure(void *ptr, int size) 249 { 250 int ret; 251 252 /* 253 * OVMF places a GUIDed structures in the flash, so 254 * search for them 255 */ 256 pc_system_parse_ovmf_flash(ptr, size); 257 258 if (sev_enabled()) { 259 ret = sev_es_save_reset_vector(ptr, size); 260 if (ret) { 261 error_report("failed to locate and/or save reset vector"); 262 exit(1); 263 } 264 265 sev_encrypt_flash(ptr, size, &error_fatal); 266 } 267 } 268