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dump.c
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dump.c
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/*
* QEMU dump
*
* Copyright Fujitsu, Corp. 2011, 2012
*
* Authors:
* Wen Congyang <wency@cn.fujitsu.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include "qemu-common.h"
#include "elf.h"
#include "cpu.h"
#include "exec/cpu-all.h"
#include "exec/hwaddr.h"
#include "monitor/monitor.h"
#include "sysemu/kvm.h"
#include "sysemu/dump.h"
#include "sysemu/sysemu.h"
#include "sysemu/memory_mapping.h"
#include "sysemu/cpus.h"
#include "qapi/error.h"
#include "qmp-commands.h"
#include <zlib.h>
#ifdef CONFIG_LZO
#include <lzo/lzo1x.h>
#endif
#ifdef CONFIG_SNAPPY
#include <snappy-c.h>
#endif
#ifndef ELF_MACHINE_UNAME
#define ELF_MACHINE_UNAME "Unknown"
#endif
static uint16_t cpu_convert_to_target16(uint16_t val, int endian)
{
if (endian == ELFDATA2LSB) {
val = cpu_to_le16(val);
} else {
val = cpu_to_be16(val);
}
return val;
}
static uint32_t cpu_convert_to_target32(uint32_t val, int endian)
{
if (endian == ELFDATA2LSB) {
val = cpu_to_le32(val);
} else {
val = cpu_to_be32(val);
}
return val;
}
static uint64_t cpu_convert_to_target64(uint64_t val, int endian)
{
if (endian == ELFDATA2LSB) {
val = cpu_to_le64(val);
} else {
val = cpu_to_be64(val);
}
return val;
}
typedef struct DumpState {
GuestPhysBlockList guest_phys_blocks;
ArchDumpInfo dump_info;
MemoryMappingList list;
uint16_t phdr_num;
uint32_t sh_info;
bool have_section;
bool resume;
ssize_t note_size;
hwaddr memory_offset;
int fd;
GuestPhysBlock *next_block;
ram_addr_t start;
bool has_filter;
int64_t begin;
int64_t length;
uint8_t *note_buf; /* buffer for notes */
size_t note_buf_offset; /* the writing place in note_buf */
uint32_t nr_cpus; /* number of guest's cpu */
size_t page_size; /* guest's page size */
uint32_t page_shift; /* guest's page shift */
uint64_t max_mapnr; /* the biggest guest's phys-mem's number */
size_t len_dump_bitmap; /* the size of the place used to store
dump_bitmap in vmcore */
off_t offset_dump_bitmap; /* offset of dump_bitmap part in vmcore */
off_t offset_page; /* offset of page part in vmcore */
size_t num_dumpable; /* number of page that can be dumped */
uint32_t flag_compress; /* indicate the compression format */
} DumpState;
static int dump_cleanup(DumpState *s)
{
int ret = 0;
guest_phys_blocks_free(&s->guest_phys_blocks);
memory_mapping_list_free(&s->list);
if (s->fd != -1) {
close(s->fd);
}
if (s->resume) {
vm_start();
}
return ret;
}
static void dump_error(DumpState *s, const char *reason)
{
dump_cleanup(s);
}
static int fd_write_vmcore(const void *buf, size_t size, void *opaque)
{
DumpState *s = opaque;
size_t written_size;
written_size = qemu_write_full(s->fd, buf, size);
if (written_size != size) {
return -1;
}
return 0;
}
static int write_elf64_header(DumpState *s)
{
Elf64_Ehdr elf_header;
int ret;
int endian = s->dump_info.d_endian;
memset(&elf_header, 0, sizeof(Elf64_Ehdr));
memcpy(&elf_header, ELFMAG, SELFMAG);
elf_header.e_ident[EI_CLASS] = ELFCLASS64;
elf_header.e_ident[EI_DATA] = s->dump_info.d_endian;
elf_header.e_ident[EI_VERSION] = EV_CURRENT;
elf_header.e_type = cpu_convert_to_target16(ET_CORE, endian);
elf_header.e_machine = cpu_convert_to_target16(s->dump_info.d_machine,
endian);
elf_header.e_version = cpu_convert_to_target32(EV_CURRENT, endian);
elf_header.e_ehsize = cpu_convert_to_target16(sizeof(elf_header), endian);
elf_header.e_phoff = cpu_convert_to_target64(sizeof(Elf64_Ehdr), endian);
elf_header.e_phentsize = cpu_convert_to_target16(sizeof(Elf64_Phdr),
endian);
elf_header.e_phnum = cpu_convert_to_target16(s->phdr_num, endian);
if (s->have_section) {
uint64_t shoff = sizeof(Elf64_Ehdr) + sizeof(Elf64_Phdr) * s->sh_info;
elf_header.e_shoff = cpu_convert_to_target64(shoff, endian);
elf_header.e_shentsize = cpu_convert_to_target16(sizeof(Elf64_Shdr),
endian);
elf_header.e_shnum = cpu_convert_to_target16(1, endian);
}
ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s);
if (ret < 0) {
dump_error(s, "dump: failed to write elf header.\n");
return -1;
}
return 0;
}
static int write_elf32_header(DumpState *s)
{
Elf32_Ehdr elf_header;
int ret;
int endian = s->dump_info.d_endian;
memset(&elf_header, 0, sizeof(Elf32_Ehdr));
memcpy(&elf_header, ELFMAG, SELFMAG);
elf_header.e_ident[EI_CLASS] = ELFCLASS32;
elf_header.e_ident[EI_DATA] = endian;
elf_header.e_ident[EI_VERSION] = EV_CURRENT;
elf_header.e_type = cpu_convert_to_target16(ET_CORE, endian);
elf_header.e_machine = cpu_convert_to_target16(s->dump_info.d_machine,
endian);
elf_header.e_version = cpu_convert_to_target32(EV_CURRENT, endian);
elf_header.e_ehsize = cpu_convert_to_target16(sizeof(elf_header), endian);
elf_header.e_phoff = cpu_convert_to_target32(sizeof(Elf32_Ehdr), endian);
elf_header.e_phentsize = cpu_convert_to_target16(sizeof(Elf32_Phdr),
endian);
elf_header.e_phnum = cpu_convert_to_target16(s->phdr_num, endian);
if (s->have_section) {
uint32_t shoff = sizeof(Elf32_Ehdr) + sizeof(Elf32_Phdr) * s->sh_info;
elf_header.e_shoff = cpu_convert_to_target32(shoff, endian);
elf_header.e_shentsize = cpu_convert_to_target16(sizeof(Elf32_Shdr),
endian);
elf_header.e_shnum = cpu_convert_to_target16(1, endian);
}
ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s);
if (ret < 0) {
dump_error(s, "dump: failed to write elf header.\n");
return -1;
}
return 0;
}
static int write_elf64_load(DumpState *s, MemoryMapping *memory_mapping,
int phdr_index, hwaddr offset,
hwaddr filesz)
{
Elf64_Phdr phdr;
int ret;
int endian = s->dump_info.d_endian;
memset(&phdr, 0, sizeof(Elf64_Phdr));
phdr.p_type = cpu_convert_to_target32(PT_LOAD, endian);
phdr.p_offset = cpu_convert_to_target64(offset, endian);
phdr.p_paddr = cpu_convert_to_target64(memory_mapping->phys_addr, endian);
phdr.p_filesz = cpu_convert_to_target64(filesz, endian);
phdr.p_memsz = cpu_convert_to_target64(memory_mapping->length, endian);
phdr.p_vaddr = cpu_convert_to_target64(memory_mapping->virt_addr, endian);
assert(memory_mapping->length >= filesz);
ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s);
if (ret < 0) {
dump_error(s, "dump: failed to write program header table.\n");
return -1;
}
return 0;
}
static int write_elf32_load(DumpState *s, MemoryMapping *memory_mapping,
int phdr_index, hwaddr offset,
hwaddr filesz)
{
Elf32_Phdr phdr;
int ret;
int endian = s->dump_info.d_endian;
memset(&phdr, 0, sizeof(Elf32_Phdr));
phdr.p_type = cpu_convert_to_target32(PT_LOAD, endian);
phdr.p_offset = cpu_convert_to_target32(offset, endian);
phdr.p_paddr = cpu_convert_to_target32(memory_mapping->phys_addr, endian);
phdr.p_filesz = cpu_convert_to_target32(filesz, endian);
phdr.p_memsz = cpu_convert_to_target32(memory_mapping->length, endian);
phdr.p_vaddr = cpu_convert_to_target32(memory_mapping->virt_addr, endian);
assert(memory_mapping->length >= filesz);
ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s);
if (ret < 0) {
dump_error(s, "dump: failed to write program header table.\n");
return -1;
}
return 0;
}
static int write_elf64_note(DumpState *s)
{
Elf64_Phdr phdr;
int endian = s->dump_info.d_endian;
hwaddr begin = s->memory_offset - s->note_size;
int ret;
memset(&phdr, 0, sizeof(Elf64_Phdr));
phdr.p_type = cpu_convert_to_target32(PT_NOTE, endian);
phdr.p_offset = cpu_convert_to_target64(begin, endian);
phdr.p_paddr = 0;
phdr.p_filesz = cpu_convert_to_target64(s->note_size, endian);
phdr.p_memsz = cpu_convert_to_target64(s->note_size, endian);
phdr.p_vaddr = 0;
ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s);
if (ret < 0) {
dump_error(s, "dump: failed to write program header table.\n");
return -1;
}
return 0;
}
static inline int cpu_index(CPUState *cpu)
{
return cpu->cpu_index + 1;
}
static int write_elf64_notes(WriteCoreDumpFunction f, DumpState *s)
{
CPUState *cpu;
int ret;
int id;
CPU_FOREACH(cpu) {
id = cpu_index(cpu);
ret = cpu_write_elf64_note(f, cpu, id, s);
if (ret < 0) {
dump_error(s, "dump: failed to write elf notes.\n");
return -1;
}
}
CPU_FOREACH(cpu) {
ret = cpu_write_elf64_qemunote(f, cpu, s);
if (ret < 0) {
dump_error(s, "dump: failed to write CPU status.\n");
return -1;
}
}
return 0;
}
static int write_elf32_note(DumpState *s)
{
hwaddr begin = s->memory_offset - s->note_size;
Elf32_Phdr phdr;
int endian = s->dump_info.d_endian;
int ret;
memset(&phdr, 0, sizeof(Elf32_Phdr));
phdr.p_type = cpu_convert_to_target32(PT_NOTE, endian);
phdr.p_offset = cpu_convert_to_target32(begin, endian);
phdr.p_paddr = 0;
phdr.p_filesz = cpu_convert_to_target32(s->note_size, endian);
phdr.p_memsz = cpu_convert_to_target32(s->note_size, endian);
phdr.p_vaddr = 0;
ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s);
if (ret < 0) {
dump_error(s, "dump: failed to write program header table.\n");
return -1;
}
return 0;
}
static int write_elf32_notes(WriteCoreDumpFunction f, DumpState *s)
{
CPUState *cpu;
int ret;
int id;
CPU_FOREACH(cpu) {
id = cpu_index(cpu);
ret = cpu_write_elf32_note(f, cpu, id, s);
if (ret < 0) {
dump_error(s, "dump: failed to write elf notes.\n");
return -1;
}
}
CPU_FOREACH(cpu) {
ret = cpu_write_elf32_qemunote(f, cpu, s);
if (ret < 0) {
dump_error(s, "dump: failed to write CPU status.\n");
return -1;
}
}
return 0;
}
static int write_elf_section(DumpState *s, int type)
{
Elf32_Shdr shdr32;
Elf64_Shdr shdr64;
int endian = s->dump_info.d_endian;
int shdr_size;
void *shdr;
int ret;
if (type == 0) {
shdr_size = sizeof(Elf32_Shdr);
memset(&shdr32, 0, shdr_size);
shdr32.sh_info = cpu_convert_to_target32(s->sh_info, endian);
shdr = &shdr32;
} else {
shdr_size = sizeof(Elf64_Shdr);
memset(&shdr64, 0, shdr_size);
shdr64.sh_info = cpu_convert_to_target32(s->sh_info, endian);
shdr = &shdr64;
}
ret = fd_write_vmcore(&shdr, shdr_size, s);
if (ret < 0) {
dump_error(s, "dump: failed to write section header table.\n");
return -1;
}
return 0;
}
static int write_data(DumpState *s, void *buf, int length)
{
int ret;
ret = fd_write_vmcore(buf, length, s);
if (ret < 0) {
dump_error(s, "dump: failed to save memory.\n");
return -1;
}
return 0;
}
/* write the memroy to vmcore. 1 page per I/O. */
static int write_memory(DumpState *s, GuestPhysBlock *block, ram_addr_t start,
int64_t size)
{
int64_t i;
int ret;
for (i = 0; i < size / TARGET_PAGE_SIZE; i++) {
ret = write_data(s, block->host_addr + start + i * TARGET_PAGE_SIZE,
TARGET_PAGE_SIZE);
if (ret < 0) {
return ret;
}
}
if ((size % TARGET_PAGE_SIZE) != 0) {
ret = write_data(s, block->host_addr + start + i * TARGET_PAGE_SIZE,
size % TARGET_PAGE_SIZE);
if (ret < 0) {
return ret;
}
}
return 0;
}
/* get the memory's offset and size in the vmcore */
static void get_offset_range(hwaddr phys_addr,
ram_addr_t mapping_length,
DumpState *s,
hwaddr *p_offset,
hwaddr *p_filesz)
{
GuestPhysBlock *block;
hwaddr offset = s->memory_offset;
int64_t size_in_block, start;
/* When the memory is not stored into vmcore, offset will be -1 */
*p_offset = -1;
*p_filesz = 0;
if (s->has_filter) {
if (phys_addr < s->begin || phys_addr >= s->begin + s->length) {
return;
}
}
QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) {
if (s->has_filter) {
if (block->target_start >= s->begin + s->length ||
block->target_end <= s->begin) {
/* This block is out of the range */
continue;
}
if (s->begin <= block->target_start) {
start = block->target_start;
} else {
start = s->begin;
}
size_in_block = block->target_end - start;
if (s->begin + s->length < block->target_end) {
size_in_block -= block->target_end - (s->begin + s->length);
}
} else {
start = block->target_start;
size_in_block = block->target_end - block->target_start;
}
if (phys_addr >= start && phys_addr < start + size_in_block) {
*p_offset = phys_addr - start + offset;
/* The offset range mapped from the vmcore file must not spill over
* the GuestPhysBlock, clamp it. The rest of the mapping will be
* zero-filled in memory at load time; see
* <http://refspecs.linuxbase.org/elf/gabi4+/ch5.pheader.html>.
*/
*p_filesz = phys_addr + mapping_length <= start + size_in_block ?
mapping_length :
size_in_block - (phys_addr - start);
return;
}
offset += size_in_block;
}
}
static int write_elf_loads(DumpState *s)
{
hwaddr offset, filesz;
MemoryMapping *memory_mapping;
uint32_t phdr_index = 1;
int ret;
uint32_t max_index;
if (s->have_section) {
max_index = s->sh_info;
} else {
max_index = s->phdr_num;
}
QTAILQ_FOREACH(memory_mapping, &s->list.head, next) {
get_offset_range(memory_mapping->phys_addr,
memory_mapping->length,
s, &offset, &filesz);
if (s->dump_info.d_class == ELFCLASS64) {
ret = write_elf64_load(s, memory_mapping, phdr_index++, offset,
filesz);
} else {
ret = write_elf32_load(s, memory_mapping, phdr_index++, offset,
filesz);
}
if (ret < 0) {
return -1;
}
if (phdr_index >= max_index) {
break;
}
}
return 0;
}
/* write elf header, PT_NOTE and elf note to vmcore. */
static int dump_begin(DumpState *s)
{
int ret;
/*
* the vmcore's format is:
* --------------
* | elf header |
* --------------
* | PT_NOTE |
* --------------
* | PT_LOAD |
* --------------
* | ...... |
* --------------
* | PT_LOAD |
* --------------
* | sec_hdr |
* --------------
* | elf note |
* --------------
* | memory |
* --------------
*
* we only know where the memory is saved after we write elf note into
* vmcore.
*/
/* write elf header to vmcore */
if (s->dump_info.d_class == ELFCLASS64) {
ret = write_elf64_header(s);
} else {
ret = write_elf32_header(s);
}
if (ret < 0) {
return -1;
}
if (s->dump_info.d_class == ELFCLASS64) {
/* write PT_NOTE to vmcore */
if (write_elf64_note(s) < 0) {
return -1;
}
/* write all PT_LOAD to vmcore */
if (write_elf_loads(s) < 0) {
return -1;
}
/* write section to vmcore */
if (s->have_section) {
if (write_elf_section(s, 1) < 0) {
return -1;
}
}
/* write notes to vmcore */
if (write_elf64_notes(fd_write_vmcore, s) < 0) {
return -1;
}
} else {
/* write PT_NOTE to vmcore */
if (write_elf32_note(s) < 0) {
return -1;
}
/* write all PT_LOAD to vmcore */
if (write_elf_loads(s) < 0) {
return -1;
}
/* write section to vmcore */
if (s->have_section) {
if (write_elf_section(s, 0) < 0) {
return -1;
}
}
/* write notes to vmcore */
if (write_elf32_notes(fd_write_vmcore, s) < 0) {
return -1;
}
}
return 0;
}
/* write PT_LOAD to vmcore */
static int dump_completed(DumpState *s)
{
dump_cleanup(s);
return 0;
}
static int get_next_block(DumpState *s, GuestPhysBlock *block)
{
while (1) {
block = QTAILQ_NEXT(block, next);
if (!block) {
/* no more block */
return 1;
}
s->start = 0;
s->next_block = block;
if (s->has_filter) {
if (block->target_start >= s->begin + s->length ||
block->target_end <= s->begin) {
/* This block is out of the range */
continue;
}
if (s->begin > block->target_start) {
s->start = s->begin - block->target_start;
}
}
return 0;
}
}
/* write all memory to vmcore */
static int dump_iterate(DumpState *s)
{
GuestPhysBlock *block;
int64_t size;
int ret;
while (1) {
block = s->next_block;
size = block->target_end - block->target_start;
if (s->has_filter) {
size -= s->start;
if (s->begin + s->length < block->target_end) {
size -= block->target_end - (s->begin + s->length);
}
}
ret = write_memory(s, block, s->start, size);
if (ret == -1) {
return ret;
}
ret = get_next_block(s, block);
if (ret == 1) {
dump_completed(s);
return 0;
}
}
}
static int create_vmcore(DumpState *s)
{
int ret;
ret = dump_begin(s);
if (ret < 0) {
return -1;
}
ret = dump_iterate(s);
if (ret < 0) {
return -1;
}
return 0;
}
static int write_start_flat_header(int fd)
{
uint8_t *buf;
MakedumpfileHeader mh;
int ret = 0;
memset(&mh, 0, sizeof(mh));
strncpy(mh.signature, MAKEDUMPFILE_SIGNATURE,
strlen(MAKEDUMPFILE_SIGNATURE));
mh.type = cpu_to_be64(TYPE_FLAT_HEADER);
mh.version = cpu_to_be64(VERSION_FLAT_HEADER);
buf = g_malloc0(MAX_SIZE_MDF_HEADER);
memcpy(buf, &mh, sizeof(mh));
size_t written_size;
written_size = qemu_write_full(fd, buf, MAX_SIZE_MDF_HEADER);
if (written_size != MAX_SIZE_MDF_HEADER) {
ret = -1;
}
g_free(buf);
return ret;
}
static int write_end_flat_header(int fd)
{
MakedumpfileDataHeader mdh;
mdh.offset = END_FLAG_FLAT_HEADER;
mdh.buf_size = END_FLAG_FLAT_HEADER;
size_t written_size;
written_size = qemu_write_full(fd, &mdh, sizeof(mdh));
if (written_size != sizeof(mdh)) {
return -1;
}
return 0;
}
static int write_buffer(int fd, off_t offset, const void *buf, size_t size)
{
size_t written_size;
MakedumpfileDataHeader mdh;
mdh.offset = cpu_to_be64(offset);
mdh.buf_size = cpu_to_be64(size);
written_size = qemu_write_full(fd, &mdh, sizeof(mdh));
if (written_size != sizeof(mdh)) {
return -1;
}
written_size = qemu_write_full(fd, buf, size);
if (written_size != size) {
return -1;
}
return 0;
}
static int buf_write_note(const void *buf, size_t size, void *opaque)
{
DumpState *s = opaque;
/* note_buf is not enough */
if (s->note_buf_offset + size > s->note_size) {
return -1;
}
memcpy(s->note_buf + s->note_buf_offset, buf, size);
s->note_buf_offset += size;
return 0;
}
/* write common header, sub header and elf note to vmcore */
static int create_header32(DumpState *s)
{
int ret = 0;
DiskDumpHeader32 *dh = NULL;
KdumpSubHeader32 *kh = NULL;
size_t size;
int endian = s->dump_info.d_endian;
uint32_t block_size;
uint32_t sub_hdr_size;
uint32_t bitmap_blocks;
uint32_t status = 0;
uint64_t offset_note;
/* write common header, the version of kdump-compressed format is 6th */
size = sizeof(DiskDumpHeader32);
dh = g_malloc0(size);
strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE));
dh->header_version = cpu_convert_to_target32(6, endian);
block_size = s->page_size;
dh->block_size = cpu_convert_to_target32(block_size, endian);
sub_hdr_size = sizeof(struct KdumpSubHeader32) + s->note_size;
sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size);
dh->sub_hdr_size = cpu_convert_to_target32(sub_hdr_size, endian);
/* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */
dh->max_mapnr = cpu_convert_to_target32(MIN(s->max_mapnr, UINT_MAX),
endian);
dh->nr_cpus = cpu_convert_to_target32(s->nr_cpus, endian);
bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2;
dh->bitmap_blocks = cpu_convert_to_target32(bitmap_blocks, endian);
strncpy(dh->utsname.machine, ELF_MACHINE_UNAME, sizeof(dh->utsname.machine));
if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) {
status |= DUMP_DH_COMPRESSED_ZLIB;
}
#ifdef CONFIG_LZO
if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) {
status |= DUMP_DH_COMPRESSED_LZO;
}
#endif
#ifdef CONFIG_SNAPPY
if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) {
status |= DUMP_DH_COMPRESSED_SNAPPY;
}
#endif
dh->status = cpu_convert_to_target32(status, endian);
if (write_buffer(s->fd, 0, dh, size) < 0) {
dump_error(s, "dump: failed to write disk dump header.\n");
ret = -1;
goto out;
}
/* write sub header */
size = sizeof(KdumpSubHeader32);
kh = g_malloc0(size);
/* 64bit max_mapnr_64 */
kh->max_mapnr_64 = cpu_convert_to_target64(s->max_mapnr, endian);
kh->phys_base = cpu_convert_to_target32(PHYS_BASE, endian);
kh->dump_level = cpu_convert_to_target32(DUMP_LEVEL, endian);
offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size;
kh->offset_note = cpu_convert_to_target64(offset_note, endian);
kh->note_size = cpu_convert_to_target32(s->note_size, endian);
if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS *
block_size, kh, size) < 0) {
dump_error(s, "dump: failed to write kdump sub header.\n");
ret = -1;
goto out;
}
/* write note */
s->note_buf = g_malloc0(s->note_size);
s->note_buf_offset = 0;
/* use s->note_buf to store notes temporarily */
if (write_elf32_notes(buf_write_note, s) < 0) {
ret = -1;
goto out;
}
if (write_buffer(s->fd, offset_note, s->note_buf,
s->note_size) < 0) {
dump_error(s, "dump: failed to write notes");
ret = -1;
goto out;
}
/* get offset of dump_bitmap */
s->offset_dump_bitmap = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size) *
block_size;
/* get offset of page */
s->offset_page = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size + bitmap_blocks) *
block_size;
out:
g_free(dh);
g_free(kh);
g_free(s->note_buf);
return ret;
}
/* write common header, sub header and elf note to vmcore */
static int create_header64(DumpState *s)
{
int ret = 0;
DiskDumpHeader64 *dh = NULL;
KdumpSubHeader64 *kh = NULL;
size_t size;
int endian = s->dump_info.d_endian;
uint32_t block_size;
uint32_t sub_hdr_size;
uint32_t bitmap_blocks;
uint32_t status = 0;
uint64_t offset_note;
/* write common header, the version of kdump-compressed format is 6th */
size = sizeof(DiskDumpHeader64);
dh = g_malloc0(size);
strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE));
dh->header_version = cpu_convert_to_target32(6, endian);
block_size = s->page_size;
dh->block_size = cpu_convert_to_target32(block_size, endian);
sub_hdr_size = sizeof(struct KdumpSubHeader64) + s->note_size;
sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size);
dh->sub_hdr_size = cpu_convert_to_target32(sub_hdr_size, endian);
/* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */
dh->max_mapnr = cpu_convert_to_target32(MIN(s->max_mapnr, UINT_MAX),
endian);
dh->nr_cpus = cpu_convert_to_target32(s->nr_cpus, endian);
bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2;
dh->bitmap_blocks = cpu_convert_to_target32(bitmap_blocks, endian);
strncpy(dh->utsname.machine, ELF_MACHINE_UNAME, sizeof(dh->utsname.machine));
if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) {
status |= DUMP_DH_COMPRESSED_ZLIB;
}
#ifdef CONFIG_LZO
if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) {
status |= DUMP_DH_COMPRESSED_LZO;
}
#endif
#ifdef CONFIG_SNAPPY
if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) {
status |= DUMP_DH_COMPRESSED_SNAPPY;
}
#endif
dh->status = cpu_convert_to_target32(status, endian);
if (write_buffer(s->fd, 0, dh, size) < 0) {
dump_error(s, "dump: failed to write disk dump header.\n");
ret = -1;
goto out;
}
/* write sub header */
size = sizeof(KdumpSubHeader64);
kh = g_malloc0(size);
/* 64bit max_mapnr_64 */
kh->max_mapnr_64 = cpu_convert_to_target64(s->max_mapnr, endian);
kh->phys_base = cpu_convert_to_target64(PHYS_BASE, endian);
kh->dump_level = cpu_convert_to_target32(DUMP_LEVEL, endian);
offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size;
kh->offset_note = cpu_convert_to_target64(offset_note, endian);
kh->note_size = cpu_convert_to_target64(s->note_size, endian);
if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS *
block_size, kh, size) < 0) {
dump_error(s, "dump: failed to write kdump sub header.\n");
ret = -1;
goto out;
}
/* write note */
s->note_buf = g_malloc0(s->note_size);
s->note_buf_offset = 0;
/* use s->note_buf to store notes temporarily */
if (write_elf64_notes(buf_write_note, s) < 0) {
ret = -1;
goto out;
}
if (write_buffer(s->fd, offset_note, s->note_buf,
s->note_size) < 0) {
dump_error(s, "dump: failed to write notes");
ret = -1;
goto out;
}
/* get offset of dump_bitmap */
s->offset_dump_bitmap = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size) *
block_size;
/* get offset of page */
s->offset_page = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size + bitmap_blocks) *
block_size;
out:
g_free(dh);
g_free(kh);
g_free(s->note_buf);