LXR qemu/hw/i386/pc

   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
  44static 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
  75static 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
  95void 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
 107void 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 */
 140static 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
 217void 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}
 263