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 "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 *isa_bios, MemoryRegion *rom_memory,
  44                              MemoryRegion *flash_mem)
  45 {
  46     int isa_bios_size;
  47     uint64_t flash_size;
  48     void *flash_ptr, *isa_bios_ptr;
  49
  50     flash_size = memory_region_size(flash_mem);
  51
  52     /* map the last 128KB of the BIOS in ISA space */
  53     isa_bios_size = MIN(flash_size, 128 * KiB);
  54     memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size,
  55                            &error_fatal);
  56     memory_region_add_subregion_overlap(rom_memory,
  57                                         0x100000 - isa_bios_size,
  58                                         isa_bios,
  59                                         1);
  60
  61     /* copy ISA rom image from top of flash memory */
  62     flash_ptr = memory_region_get_ram_ptr(flash_mem);
  63     isa_bios_ptr = memory_region_get_ram_ptr(isa_bios);
  64     memcpy(isa_bios_ptr,
  65            ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size),
  66            isa_bios_size);
  67
  68     memory_region_set_readonly(isa_bios, true);
  69 }
  70
  71 static PFlashCFI01 *pc_pflash_create(PCMachineState *pcms,
  72                                      const char *name,
  73                                      const char *alias_prop_name)
  74 {
  75     DeviceState *dev = qdev_new(TYPE_PFLASH_CFI01);
  76
  77     qdev_prop_set_uint64(dev, "sector-length", FLASH_SECTOR_SIZE);
  78     qdev_prop_set_uint8(dev, "width", 1);
  79     qdev_prop_set_string(dev, "name", name);
  80     object_property_add_child(OBJECT(pcms), name, OBJECT(dev));
  81     object_property_add_alias(OBJECT(pcms), alias_prop_name,
  82                               OBJECT(dev), "drive");
  83     /*
  84      * The returned reference is tied to the child property and
  85      * will be removed with object_unparent.
  86      */
  87     object_unref(OBJECT(dev));
  88     return PFLASH_CFI01(dev);
  89 }
  90
  91 void pc_system_flash_create(PCMachineState *pcms)
  92 {
  93     PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
  94
  95     if (pcmc->pci_enabled) {
  96         pcms->flash[0] = pc_pflash_create(pcms, "system.flash0",
  97                                           "pflash0");
  98         pcms->flash[1] = pc_pflash_create(pcms, "system.flash1",
  99                                           "pflash1");
 100     }
 101 }
 102
 103 void pc_system_flash_cleanup_unused(PCMachineState *pcms)
 104 {
 105     char *prop_name;
 106     int i;
 107
 108     assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled);
 109
 110     for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) {
 111         if (!qdev_is_realized(DEVICE(pcms->flash[i]))) {
 112             prop_name = g_strdup_printf("pflash%d", i);
 113             object_property_del(OBJECT(pcms), prop_name);
 114             g_free(prop_name);
 115             object_unparent(OBJECT(pcms->flash[i]));
 116             pcms->flash[i] = NULL;
 117         }
 118     }
 119 }
 120
 121 /*
 122  * Map the pcms->flash[] from 4GiB downward, and realize.
 123  * Map them in descending order, i.e. pcms->flash[0] at the top,
 124  * without gaps.
 125  * Stop at the first pcms->flash[0] lacking a block backend.
 126  * Set each flash's size from its block backend.  Fatal error if the
 127  * size isn't a non-zero multiple of 4KiB, or the total size exceeds
 128  * pcms->max_fw_size.
 129  *
 130  * If pcms->flash[0] has a block backend, its memory is passed to
 131  * pc_isa_bios_init().  Merging several flash devices for isa-bios is
 132  * not supported.
 133  */
 134 static void pc_system_flash_map(PCMachineState *pcms,
 135                                 MemoryRegion *rom_memory)
 136 {
 137     X86MachineState *x86ms = X86_MACHINE(pcms);
 138     hwaddr total_size = 0;
 139     int i;
 140     BlockBackend *blk;
 141     int64_t size;
 142     PFlashCFI01 *system_flash;
 143     MemoryRegion *flash_mem;
 144     void *flash_ptr;
 145     int flash_size;
 146
 147     assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled);
 148
 149     for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) {
 150         system_flash = pcms->flash[i];
 151         blk = pflash_cfi01_get_blk(system_flash);
 152         if (!blk) {
 153             break;
 154         }
 155         size = blk_getlength(blk);
 156         if (size < 0) {
 157             error_report("can't get size of block device %s: %s",
 158                          blk_name(blk), strerror(-size));
 159             exit(1);
 160         }
 161         if (size == 0 || !QEMU_IS_ALIGNED(size, FLASH_SECTOR_SIZE)) {
 162             error_report("system firmware block device %s has invalid size "
 163                          "%" PRId64,
 164                          blk_name(blk), size);
 165             info_report("its size must be a non-zero multiple of 0x%x",
 166                         FLASH_SECTOR_SIZE);
 167             exit(1);
 168         }
 169         if ((hwaddr)size != size
 170             || total_size > HWADDR_MAX - size
 171             || total_size + size > pcms->max_fw_size) {
 172             error_report("combined size of system firmware exceeds "
 173                          "%" PRIu64 " bytes",
 174                          pcms->max_fw_size);
 175             exit(1);
 176         }
 177
 178         total_size += size;
 179         qdev_prop_set_uint32(DEVICE(system_flash), "num-blocks",
 180                              size / FLASH_SECTOR_SIZE);
 181         sysbus_realize_and_unref(SYS_BUS_DEVICE(system_flash), &error_fatal);
 182         sysbus_mmio_map(SYS_BUS_DEVICE(system_flash), 0,
 183                         0x100000000ULL - total_size);
 184
 185         if (i == 0) {
 186             flash_mem = pflash_cfi01_get_memory(system_flash);
 187             pc_isa_bios_init(&x86ms->isa_bios, rom_memory, flash_mem);
 188
 189             /* Encrypt the pflash boot ROM */
 190             if (sev_enabled()) {
 191                 flash_ptr = memory_region_get_ram_ptr(flash_mem);
 192                 flash_size = memory_region_size(flash_mem);
 193                 x86_firmware_configure(flash_ptr, flash_size);
 194             }
 195         }
 196     }
 197 }
 198
 199 void pc_system_firmware_init(PCMachineState *pcms,
 200                              MemoryRegion *rom_memory)
 201 {
 202     PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
 203     int i;
 204     BlockBackend *pflash_blk[ARRAY_SIZE(pcms->flash)];
 205
 206     if (!pcmc->pci_enabled) {
 207         x86_bios_rom_init(X86_MACHINE(pcms), "bios.bin", rom_memory, true);
 208         return;
 209     }
 210
 211     /* Map legacy -drive if=pflash to machine properties */
 212     for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) {
 213         pflash_cfi01_legacy_drive(pcms->flash[i],
 214                                   drive_get(IF_PFLASH, 0, i));
 215         pflash_blk[i] = pflash_cfi01_get_blk(pcms->flash[i]);
 216     }
 217
 218     /* Reject gaps */
 219     for (i = 1; i < ARRAY_SIZE(pcms->flash); i++) {
 220         if (pflash_blk[i] && !pflash_blk[i - 1]) {
 221             error_report("pflash%d requires pflash%d", i, i - 1);
 222             exit(1);
 223         }
 224     }
 225
 226     if (!pflash_blk[0]) {
 227         /* Machine property pflash0 not set, use ROM mode */
 228         x86_bios_rom_init(X86_MACHINE(pcms), "bios.bin", rom_memory, false);
 229     } else {
 230         if (kvm_enabled() && !kvm_readonly_mem_enabled()) {
 231             /*
 232              * Older KVM cannot execute from device memory. So, flash
 233              * memory cannot be used unless the readonly memory kvm
 234              * capability is present.
 235              */
 236             error_report("pflash with kvm requires KVM readonly memory support");
 237             exit(1);
 238         }
 239
 240         pc_system_flash_map(pcms, rom_memory);
 241     }
 242
 243     pc_system_flash_cleanup_unused(pcms);
 244 }
 245
 246 void x86_firmware_configure(void *ptr, int size)
 247 {
 248     int ret;
 249
 250     /*
 251      * OVMF places a GUIDed structures in the flash, so
 252      * search for them
 253      */
 254     pc_system_parse_ovmf_flash(ptr, size);
 255
 256     if (sev_enabled()) {
 257         ret = sev_es_save_reset_vector(ptr, size);
 258         if (ret) {
 259             error_report("failed to locate and/or save reset vector");
 260             exit(1);
 261         }
 262
 263         sev_encrypt_flash(ptr, size, &error_fatal);
 264     }
 265 }