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qemu/hw/i386/pc_sysfw.c

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/*
* 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 "sysemu/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;
}
}
}
#define OVMF_TABLE_FOOTER_GUID "96b582de-1fb2-45f7-baea-a366c55a082d"
static uint8_t *ovmf_table;
static int ovmf_table_len;
static void pc_system_parse_ovmf_flash(uint8_t *flash_ptr, size_t flash_size)
{
uint8_t *ptr;
QemuUUID guid;
int tot_len;
/* should only be called once */
if (ovmf_table) {
return;
}
if (flash_size < TARGET_PAGE_SIZE) {
return;
}
/*
* if this is OVMF there will be a table footer
* guid 48 bytes before the end of the flash file. If it's
* not found, silently abort the flash parsing.
*/
qemu_uuid_parse(OVMF_TABLE_FOOTER_GUID, &guid);
guid = qemu_uuid_bswap(guid); /* guids are LE */
ptr = flash_ptr + flash_size - 48;
if (!qemu_uuid_is_equal((QemuUUID *)ptr, &guid)) {
return;
}
/* if found, just before is two byte table length */
ptr -= sizeof(uint16_t);
tot_len = le16_to_cpu(*(uint16_t *)ptr) - sizeof(guid) - sizeof(uint16_t);
if (tot_len <= 0) {
return;
}
ovmf_table = g_malloc(tot_len);
ovmf_table_len = tot_len;
/*
* ptr is the foot of the table, so copy it all to the newly
* allocated ovmf_table and then set the ovmf_table pointer
* to the table foot
*/
memcpy(ovmf_table, ptr - tot_len, tot_len);
ovmf_table += tot_len;
}
bool pc_system_ovmf_table_find(const char *entry, uint8_t **data,
int *data_len)
{
uint8_t *ptr = ovmf_table;
int tot_len = ovmf_table_len;
QemuUUID entry_guid;
if (qemu_uuid_parse(entry, &entry_guid) < 0) {
return false;
}
if (!ptr) {
return false;
}
entry_guid = qemu_uuid_bswap(entry_guid); /* guids are LE */
while (tot_len >= sizeof(QemuUUID) + sizeof(uint16_t)) {
int len;
QemuUUID *guid;
/*
* The data structure is
* arbitrary length data
* 2 byte length of entire entry
* 16 byte guid
*/
guid = (QemuUUID *)(ptr - sizeof(QemuUUID));
len = le16_to_cpu(*(uint16_t *)(ptr - sizeof(QemuUUID) -
sizeof(uint16_t)));
/*
* just in case the table is corrupt, wouldn't want to spin in
* the zero case
*/
if (len < sizeof(QemuUUID) + sizeof(uint16_t)) {
return false;
} else if (len > tot_len) {
return false;
}
ptr -= len;
tot_len -= len;
if (qemu_uuid_is_equal(guid, &entry_guid)) {
if (data) {
*data = ptr;
}
if (data_len) {
*data_len = len - sizeof(QemuUUID) - sizeof(uint16_t);
}
return true;
}
}
return false;
}
/*
* 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);
}
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