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 "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
  43static 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
  74static 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
  94void 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
 106void pc_system_flash_cleanup_unused(PCMachineState *pcms)
 107{
 108    char *prop_name;
 109    int i;
 110    Object *dev_obj;
 111
 112    assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled);
 113
 114    for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) {
 115        dev_obj = OBJECT(pcms->flash[i]);
 116        if (!object_property_get_bool(dev_obj, "realized", &error_abort)) {
 117            prop_name = g_strdup_printf("pflash%d", i);
 118            object_property_del(OBJECT(pcms), prop_name);
 119            g_free(prop_name);
 120            object_unparent(dev_obj);
 121            pcms->flash[i] = NULL;
 122        }
 123    }
 124}
 125
 126/*
 127 * Map the pcms->flash[] from 4GiB downward, and realize.
 128 * Map them in descending order, i.e. pcms->flash[0] at the top,
 129 * without gaps.
 130 * Stop at the first pcms->flash[0] lacking a block backend.
 131 * Set each flash's size from its block backend.  Fatal error if the
 132 * size isn't a non-zero multiple of 4KiB, or the total size exceeds
 133 * pcms->max_fw_size.
 134 *
 135 * If pcms->flash[0] has a block backend, its memory is passed to
 136 * pc_isa_bios_init().  Merging several flash devices for isa-bios is
 137 * not supported.
 138 */
 139static void pc_system_flash_map(PCMachineState *pcms,
 140                                MemoryRegion *rom_memory)
 141{
 142    hwaddr total_size = 0;
 143    int i;
 144    BlockBackend *blk;
 145    int64_t size;
 146    PFlashCFI01 *system_flash;
 147    MemoryRegion *flash_mem;
 148    void *flash_ptr;
 149    int flash_size;
 150
 151    assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled);
 152
 153    for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) {
 154        system_flash = pcms->flash[i];
 155        blk = pflash_cfi01_get_blk(system_flash);
 156        if (!blk) {
 157            break;
 158        }
 159        size = blk_getlength(blk);
 160        if (size < 0) {
 161            error_report("can't get size of block device %s: %s",
 162                         blk_name(blk), strerror(-size));
 163            exit(1);
 164        }
 165        if (size == 0 || !QEMU_IS_ALIGNED(size, FLASH_SECTOR_SIZE)) {
 166            error_report("system firmware block device %s has invalid size "
 167                         "%" PRId64,
 168                         blk_name(blk), size);
 169            info_report("its size must be a non-zero multiple of 0x%x",
 170                        FLASH_SECTOR_SIZE);
 171            exit(1);
 172        }
 173        if ((hwaddr)size != size
 174            || total_size > HWADDR_MAX - size
 175            || total_size + size > pcms->max_fw_size) {
 176            error_report("combined size of system firmware exceeds "
 177                         "%" PRIu64 " bytes",
 178                         pcms->max_fw_size);
 179            exit(1);
 180        }
 181
 182        total_size += size;
 183        qdev_prop_set_uint32(DEVICE(system_flash), "num-blocks",
 184                             size / FLASH_SECTOR_SIZE);
 185        sysbus_realize_and_unref(SYS_BUS_DEVICE(system_flash), &error_fatal);
 186        sysbus_mmio_map(SYS_BUS_DEVICE(system_flash), 0,
 187                        0x100000000ULL - total_size);
 188
 189        if (i == 0) {
 190            flash_mem = pflash_cfi01_get_memory(system_flash);
 191            pc_isa_bios_init(rom_memory, flash_mem, size);
 192
 193            /* Encrypt the pflash boot ROM */
 194            if (sev_enabled()) {
 195                flash_ptr = memory_region_get_ram_ptr(flash_mem);
 196                flash_size = memory_region_size(flash_mem);
 197                x86_firmware_configure(flash_ptr, flash_size);
 198            }
 199        }
 200    }
 201}
 202
 203void pc_system_firmware_init(PCMachineState *pcms,
 204                             MemoryRegion *rom_memory)
 205{
 206    PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
 207    int i;
 208    BlockBackend *pflash_blk[ARRAY_SIZE(pcms->flash)];
 209
 210    if (!pcmc->pci_enabled) {
 211        x86_bios_rom_init(MACHINE(pcms), "bios.bin", rom_memory, true);
 212        return;
 213    }
 214
 215    /* Map legacy -drive if=pflash to machine properties */
 216    for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) {
 217        pflash_cfi01_legacy_drive(pcms->flash[i],
 218                                  drive_get(IF_PFLASH, 0, i));
 219        pflash_blk[i] = pflash_cfi01_get_blk(pcms->flash[i]);
 220    }
 221
 222    /* Reject gaps */
 223    for (i = 1; i < ARRAY_SIZE(pcms->flash); i++) {
 224        if (pflash_blk[i] && !pflash_blk[i - 1]) {
 225            error_report("pflash%d requires pflash%d", i, i - 1);
 226            exit(1);
 227        }
 228    }
 229
 230    if (!pflash_blk[0]) {
 231        /* Machine property pflash0 not set, use ROM mode */
 232        x86_bios_rom_init(MACHINE(pcms), "bios.bin", rom_memory, false);
 233    } else {
 234        if (kvm_enabled() && !kvm_readonly_mem_enabled()) {
 235            /*
 236             * Older KVM cannot execute from device memory. So, flash
 237             * memory cannot be used unless the readonly memory kvm
 238             * capability is present.
 239             */
 240            error_report("pflash with kvm requires KVM readonly memory support");
 241            exit(1);
 242        }
 243
 244        pc_system_flash_map(pcms, rom_memory);
 245    }
 246
 247    pc_system_flash_cleanup_unused(pcms);
 248}
 249
 250void x86_firmware_configure(void *ptr, int size)
 251{
 252    int ret;
 253
 254    /*
 255     * OVMF places a GUIDed structures in the flash, so
 256     * search for them
 257     */
 258    pc_system_parse_ovmf_flash(ptr, size);
 259
 260    if (sev_enabled()) {
 261        ret = sev_es_save_reset_vector(ptr, size);
 262        if (ret) {
 263            error_report("failed to locate and/or save reset vector");
 264            exit(1);
 265        }
 266
 267        sev_encrypt_flash(ptr, size, &error_fatal);
 268    }
 269}
 270