hw/i386/pc_sysfw.c

   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 "qemu-common.h"
  28 #include "qapi/error.h"
  29 #include "sysemu/block-backend.h"
  30 #include "qemu/error-report.h"
  31 #include "qemu/option.h"
  32 #include "qemu/units.h"
  33 #include "hw/sysbus.h"
  34 #include "hw/i386/x86.h"
  35 #include "hw/i386/pc.h"
  36 #include "hw/loader.h"
  37 #include "hw/qdev-properties.h"
  38 #include "hw/block/flash.h"
  39 #include "sysemu/kvm.h"
  40 #include "sysemu/sev.h"
  41
  42 #define FLASH_SECTOR_SIZE 4096
  43
  44 static void pc_isa_bios_init(MemoryRegion *rom_memory,
  45                              MemoryRegion *flash_mem,
  46                              int ram_size)
  47 {
  48     int isa_bios_size;
  49     MemoryRegion *isa_bios;
  50     uint64_t flash_size;
  51     void *flash_ptr, *isa_bios_ptr;
  52
  53     flash_size = memory_region_size(flash_mem);
  54
  55     /* map the last 128KB of the BIOS in ISA space */
  56     isa_bios_size = MIN(flash_size, 128 * KiB);
  57     isa_bios = g_malloc(sizeof(*isa_bios));
  58     memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size,
  59                            &error_fatal);
  60     memory_region_add_subregion_overlap(rom_memory,
  61                                         0x100000 - isa_bios_size,
  62                                         isa_bios,
  63                                         1);
  64
  65     /* copy ISA rom image from top of flash memory */
  66     flash_ptr = memory_region_get_ram_ptr(flash_mem);
  67     isa_bios_ptr = memory_region_get_ram_ptr(isa_bios);
  68     memcpy(isa_bios_ptr,
  69            ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size),
  70            isa_bios_size);
  71
  72     memory_region_set_readonly(isa_bios, true);
  73 }
  74
  75 static PFlashCFI01 *pc_pflash_create(PCMachineState *pcms,
  76                                      const char *name,
  77                                      const char *alias_prop_name)
  78 {
  79     DeviceState *dev = qdev_new(TYPE_PFLASH_CFI01);
  80
  81     qdev_prop_set_uint64(dev, "sector-length", FLASH_SECTOR_SIZE);
  82     qdev_prop_set_uint8(dev, "width", 1);
  83     qdev_prop_set_string(dev, "name", name);
  84     object_property_add_child(OBJECT(pcms), name, OBJECT(dev));
  85     object_property_add_alias(OBJECT(pcms), alias_prop_name,
  86                               OBJECT(dev), "drive");
  87     /*
  88      * The returned reference is tied to the child property and
  89      * will be removed with object_unparent.
  90      */
  91     object_unref(OBJECT(dev));
  92     return PFLASH_CFI01(dev);
  93 }
  94
  95 void pc_system_flash_create(PCMachineState *pcms)
  96 {
  97     PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
  98
  99     if (pcmc->pci_enabled) {
 100         pcms->flash[0] = pc_pflash_create(pcms, "system.flash0",
 101                                           "pflash0");
 102         pcms->flash[1] = pc_pflash_create(pcms, "system.flash1",
 103                                           "pflash1");
 104     }
 105 }
 106
 107 void pc_system_flash_cleanup_unused(PCMachineState *pcms)
 108 {
 109     char *prop_name;
 110     int i;
 111     Object *dev_obj;
 112
 113     assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled);
 114
 115     for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) {
 116         dev_obj = OBJECT(pcms->flash[i]);
 117         if (!object_property_get_bool(dev_obj, "realized", &error_abort)) {
 118             prop_name = g_strdup_printf("pflash%d", i);
 119             object_property_del(OBJECT(pcms), prop_name);
 120             g_free(prop_name);
 121             object_unparent(dev_obj);
 122             pcms->flash[i] = NULL;
 123         }
 124     }
 125 }
 126
 127 /*
 128  * Map the pcms->flash[] from 4GiB downward, and realize.
 129  * Map them in descending order, i.e. pcms->flash[0] at the top,
 130  * without gaps.
 131  * Stop at the first pcms->flash[0] lacking a block backend.
 132  * Set each flash's size from its block backend.  Fatal error if the
 133  * size isn't a non-zero multiple of 4KiB, or the total size exceeds
 134  * pcms->max_fw_size.
 135  *
 136  * If pcms->flash[0] has a block backend, its memory is passed to
 137  * pc_isa_bios_init().  Merging several flash devices for isa-bios is
 138  * not supported.
 139  */
 140 static void pc_system_flash_map(PCMachineState *pcms,
 141                                 MemoryRegion *rom_memory)
 142 {
 143     hwaddr total_size = 0;
 144     int i;
 145     BlockBackend *blk;
 146     int64_t size;
 147     PFlashCFI01 *system_flash;
 148     MemoryRegion *flash_mem;
 149     void *flash_ptr;
 150     int flash_size;
 151     int ret;
 152
 153     assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled);
 154
 155     for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) {
 156         system_flash = pcms->flash[i];
 157         blk = pflash_cfi01_get_blk(system_flash);
 158         if (!blk) {
 159             break;
 160         }
 161         size = blk_getlength(blk);
 162         if (size < 0) {
 163             error_report("can't get size of block device %s: %s",
 164                          blk_name(blk), strerror(-size));
 165             exit(1);
 166         }
 167         if (size == 0 || !QEMU_IS_ALIGNED(size, FLASH_SECTOR_SIZE)) {
 168             error_report("system firmware block device %s has invalid size "
 169                          "%" PRId64,
 170                          blk_name(blk), size);
 171             info_report("its size must be a non-zero multiple of 0x%x",
 172                         FLASH_SECTOR_SIZE);
 173             exit(1);
 174         }
 175         if ((hwaddr)size != size
 176             || total_size > HWADDR_MAX - size
 177             || total_size + size > pcms->max_fw_size) {
 178             error_report("combined size of system firmware exceeds "
 179                          "%" PRIu64 " bytes",
 180                          pcms->max_fw_size);
 181             exit(1);
 182         }
 183
 184         total_size += size;
 185         qdev_prop_set_uint32(DEVICE(system_flash), "num-blocks",
 186                              size / FLASH_SECTOR_SIZE);
 187         sysbus_realize_and_unref(SYS_BUS_DEVICE(system_flash), &error_fatal);
 188         sysbus_mmio_map(SYS_BUS_DEVICE(system_flash), 0,
 189                         0x100000000ULL - total_size);
 190
 191         if (i == 0) {
 192             flash_mem = pflash_cfi01_get_memory(system_flash);
 193             pc_isa_bios_init(rom_memory, flash_mem, size);
 194
 195             /* Encrypt the pflash boot ROM */
 196             if (sev_enabled()) {
 197                 flash_ptr = memory_region_get_ram_ptr(flash_mem);
 198                 flash_size = memory_region_size(flash_mem);
 199                 /*
 200                  * OVMF places a GUIDed structures in the flash, so
 201                  * search for them
 202                  */
 203                 pc_system_parse_ovmf_flash(flash_ptr, flash_size);
 204
 205                 ret = sev_es_save_reset_vector(flash_ptr, flash_size);
 206                 if (ret) {
 207                     error_report("failed to locate and/or save reset vector");
 208                     exit(1);
 209                 }
 210
 211                 sev_encrypt_flash(flash_ptr, flash_size, &error_fatal);
 212             }
 213         }
 214     }
 215 }
 216
 217 void pc_system_firmware_init(PCMachineState *pcms,
 218                              MemoryRegion *rom_memory)
 219 {
 220     PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
 221     int i;
 222     BlockBackend *pflash_blk[ARRAY_SIZE(pcms->flash)];
 223
 224     if (!pcmc->pci_enabled) {
 225         x86_bios_rom_init(MACHINE(pcms), "bios.bin", rom_memory, true);
 226         return;
 227     }
 228
 229     /* Map legacy -drive if=pflash to machine properties */
 230     for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) {
 231         pflash_cfi01_legacy_drive(pcms->flash[i],
 232                                   drive_get(IF_PFLASH, 0, i));
 233         pflash_blk[i] = pflash_cfi01_get_blk(pcms->flash[i]);
 234     }
 235
 236     /* Reject gaps */
 237     for (i = 1; i < ARRAY_SIZE(pcms->flash); i++) {
 238         if (pflash_blk[i] && !pflash_blk[i - 1]) {
 239             error_report("pflash%d requires pflash%d", i, i - 1);
 240             exit(1);
 241         }
 242     }
 243
 244     if (!pflash_blk[0]) {
 245         /* Machine property pflash0 not set, use ROM mode */
 246         x86_bios_rom_init(MACHINE(pcms), "bios.bin", rom_memory, false);
 247     } else {
 248         if (kvm_enabled() && !kvm_readonly_mem_enabled()) {
 249             /*
 250              * Older KVM cannot execute from device memory. So, flash
 251              * memory cannot be used unless the readonly memory kvm
 252              * capability is present.
 253              */
 254             error_report("pflash with kvm requires KVM readonly memory support");
 255             exit(1);
 256         }
 257
 258         pc_system_flash_map(pcms, rom_memory);
 259     }
 260
 261     pc_system_flash_cleanup_unused(pcms);
 262 }