diff options
Diffstat (limited to 'hw/i386/pc_sysfw.c')
| -rw-r--r-- | hw/i386/pc_sysfw.c | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/hw/i386/pc_sysfw.c b/hw/i386/pc_sysfw.c new file mode 100644 index 000000000..c8b17af95 --- /dev/null +++ b/hw/i386/pc_sysfw.c @@ -0,0 +1,262 @@ +/* + * QEMU PC System Firmware + * + * Copyright (c) 2003-2004 Fabrice Bellard + * Copyright (c) 2011-2012 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +#include "qemu/osdep.h" +#include "qemu-common.h" +#include "qapi/error.h" +#include "sysemu/block-backend.h" +#include "qemu/error-report.h" +#include "qemu/option.h" +#include "qemu/units.h" +#include "hw/sysbus.h" +#include "hw/i386/x86.h" +#include "hw/i386/pc.h" +#include "hw/loader.h" +#include "hw/qdev-properties.h" +#include "hw/block/flash.h" +#include "sysemu/kvm.h" +#include "sev.h" + +#define FLASH_SECTOR_SIZE 4096 + +static void pc_isa_bios_init(MemoryRegion *rom_memory, + MemoryRegion *flash_mem, + int ram_size) +{ + int isa_bios_size; + MemoryRegion *isa_bios; + uint64_t flash_size; + void *flash_ptr, *isa_bios_ptr; + + flash_size = memory_region_size(flash_mem); + + /* map the last 128KB of the BIOS in ISA space */ + isa_bios_size = MIN(flash_size, 128 * KiB); + isa_bios = g_malloc(sizeof(*isa_bios)); + memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size, + &error_fatal); + memory_region_add_subregion_overlap(rom_memory, + 0x100000 - isa_bios_size, + isa_bios, + 1); + + /* copy ISA rom image from top of flash memory */ + flash_ptr = memory_region_get_ram_ptr(flash_mem); + isa_bios_ptr = memory_region_get_ram_ptr(isa_bios); + memcpy(isa_bios_ptr, + ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size), + isa_bios_size); + + memory_region_set_readonly(isa_bios, true); +} + +static PFlashCFI01 *pc_pflash_create(PCMachineState *pcms, + const char *name, + const char *alias_prop_name) +{ + DeviceState *dev = qdev_new(TYPE_PFLASH_CFI01); + + qdev_prop_set_uint64(dev, "sector-length", FLASH_SECTOR_SIZE); + qdev_prop_set_uint8(dev, "width", 1); + qdev_prop_set_string(dev, "name", name); + object_property_add_child(OBJECT(pcms), name, OBJECT(dev)); + object_property_add_alias(OBJECT(pcms), alias_prop_name, + OBJECT(dev), "drive"); + /* + * The returned reference is tied to the child property and + * will be removed with object_unparent. + */ + object_unref(OBJECT(dev)); + return PFLASH_CFI01(dev); +} + +void pc_system_flash_create(PCMachineState *pcms) +{ + PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms); + + if (pcmc->pci_enabled) { + pcms->flash[0] = pc_pflash_create(pcms, "system.flash0", + "pflash0"); + pcms->flash[1] = pc_pflash_create(pcms, "system.flash1", + "pflash1"); + } +} + +void pc_system_flash_cleanup_unused(PCMachineState *pcms) +{ + char *prop_name; + int i; + Object *dev_obj; + + assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled); + + for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { + dev_obj = OBJECT(pcms->flash[i]); + if (!object_property_get_bool(dev_obj, "realized", &error_abort)) { + prop_name = g_strdup_printf("pflash%d", i); + object_property_del(OBJECT(pcms), prop_name); + g_free(prop_name); + object_unparent(dev_obj); + pcms->flash[i] = NULL; + } + } +} + +/* + * Map the pcms->flash[] from 4GiB downward, and realize. + * Map them in descending order, i.e. pcms->flash[0] at the top, + * without gaps. + * Stop at the first pcms->flash[0] lacking a block backend. + * Set each flash's size from its block backend. Fatal error if the + * size isn't a non-zero multiple of 4KiB, or the total size exceeds + * pcms->max_fw_size. + * + * If pcms->flash[0] has a block backend, its memory is passed to + * pc_isa_bios_init(). Merging several flash devices for isa-bios is + * not supported. + */ +static void pc_system_flash_map(PCMachineState *pcms, + MemoryRegion *rom_memory) +{ + hwaddr total_size = 0; + int i; + BlockBackend *blk; + int64_t size; + PFlashCFI01 *system_flash; + MemoryRegion *flash_mem; + void *flash_ptr; + int flash_size; + int ret; + + assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled); + + for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { + system_flash = pcms->flash[i]; + blk = pflash_cfi01_get_blk(system_flash); + if (!blk) { + break; + } + size = blk_getlength(blk); + if (size < 0) { + error_report("can't get size of block device %s: %s", + blk_name(blk), strerror(-size)); + exit(1); + } + if (size == 0 || !QEMU_IS_ALIGNED(size, FLASH_SECTOR_SIZE)) { + error_report("system firmware block device %s has invalid size " + "%" PRId64, + blk_name(blk), size); + info_report("its size must be a non-zero multiple of 0x%x", + FLASH_SECTOR_SIZE); + exit(1); + } + if ((hwaddr)size != size + || total_size > HWADDR_MAX - size + || total_size + size > pcms->max_fw_size) { + error_report("combined size of system firmware exceeds " + "%" PRIu64 " bytes", + pcms->max_fw_size); + exit(1); + } + + total_size += size; + qdev_prop_set_uint32(DEVICE(system_flash), "num-blocks", + size / FLASH_SECTOR_SIZE); + sysbus_realize_and_unref(SYS_BUS_DEVICE(system_flash), &error_fatal); + sysbus_mmio_map(SYS_BUS_DEVICE(system_flash), 0, + 0x100000000ULL - total_size); + + if (i == 0) { + flash_mem = pflash_cfi01_get_memory(system_flash); + pc_isa_bios_init(rom_memory, flash_mem, size); + + /* Encrypt the pflash boot ROM */ + if (sev_enabled()) { + flash_ptr = memory_region_get_ram_ptr(flash_mem); + flash_size = memory_region_size(flash_mem); + /* + * OVMF places a GUIDed structures in the flash, so + * search for them + */ + pc_system_parse_ovmf_flash(flash_ptr, flash_size); + + ret = sev_es_save_reset_vector(flash_ptr, flash_size); + if (ret) { + error_report("failed to locate and/or save reset vector"); + exit(1); + } + + sev_encrypt_flash(flash_ptr, flash_size, &error_fatal); + } + } + } +} + +void pc_system_firmware_init(PCMachineState *pcms, + MemoryRegion *rom_memory) +{ + PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms); + int i; + BlockBackend *pflash_blk[ARRAY_SIZE(pcms->flash)]; + + if (!pcmc->pci_enabled) { + x86_bios_rom_init(MACHINE(pcms), "bios.bin", rom_memory, true); + return; + } + + /* Map legacy -drive if=pflash to machine properties */ + for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { + pflash_cfi01_legacy_drive(pcms->flash[i], + drive_get(IF_PFLASH, 0, i)); + pflash_blk[i] = pflash_cfi01_get_blk(pcms->flash[i]); + } + + /* Reject gaps */ + for (i = 1; i < ARRAY_SIZE(pcms->flash); i++) { + if (pflash_blk[i] && !pflash_blk[i - 1]) { + error_report("pflash%d requires pflash%d", i, i - 1); + exit(1); + } + } + + if (!pflash_blk[0]) { + /* Machine property pflash0 not set, use ROM mode */ + x86_bios_rom_init(MACHINE(pcms), "bios.bin", rom_memory, false); + } else { + if (kvm_enabled() && !kvm_readonly_mem_enabled()) { + /* + * Older KVM cannot execute from device memory. So, flash + * memory cannot be used unless the readonly memory kvm + * capability is present. + */ + error_report("pflash with kvm requires KVM readonly memory support"); + exit(1); + } + + pc_system_flash_map(pcms, rom_memory); + } + + pc_system_flash_cleanup_unused(pcms); +} |