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qemu-patch-raspberry4/dump.c
Laszlo Ersek 92ba1401e0 dump: simplify write_start_flat_header() 
Currently, the function
- defines and populates an auto variable of type MakedumpfileHeader
- allocates and zeroes a buffer of size MAX_SIZE_MDF_HEADER (4096)
- copies the former into the latter (covering an initial portion of the
  latter)

Fill in the MakedumpfileHeader structure in its final place (the alignment
is OK because the structure lives at the address returned by g_malloc0()).

Approximately-suggested-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2014-06-11 10:10:28 -04:00

1823 lines
52 KiB
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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)
{
MakedumpfileHeader *mh;
int ret = 0;
QEMU_BUILD_BUG_ON(sizeof *mh > MAX_SIZE_MDF_HEADER);
mh = g_malloc0(MAX_SIZE_MDF_HEADER);
memcpy(mh->signature, MAKEDUMPFILE_SIGNATURE,
MIN(sizeof mh->signature, sizeof MAKEDUMPFILE_SIGNATURE));
mh->type = cpu_to_be64(TYPE_FLAT_HEADER);
mh->version = cpu_to_be64(VERSION_FLAT_HEADER);
size_t written_size;
written_size = qemu_write_full(fd, mh, MAX_SIZE_MDF_HEADER);
if (written_size != MAX_SIZE_MDF_HEADER) {
ret = -1;
}
g_free(mh);
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);
return ret;
}
static int write_dump_header(DumpState *s)
{
if (s->dump_info.d_machine == EM_386) {
return create_header32(s);
} else {
return create_header64(s);
}
}
/*
* set dump_bitmap sequencely. the bit before last_pfn is not allowed to be
* rewritten, so if need to set the first bit, set last_pfn and pfn to 0.
* set_dump_bitmap will always leave the recently set bit un-sync. And setting
* (last bit + sizeof(buf) * 8) to 0 will do flushing the content in buf into
* vmcore, ie. synchronizing un-sync bit into vmcore.
*/
static int set_dump_bitmap(uint64_t last_pfn, uint64_t pfn, bool value,
uint8_t *buf, DumpState *s)
{
off_t old_offset, new_offset;
off_t offset_bitmap1, offset_bitmap2;
uint32_t byte, bit;
/* should not set the previous place */
assert(last_pfn <= pfn);
/*
* if the bit needed to be set is not cached in buf, flush the data in buf
* to vmcore firstly.
* making new_offset be bigger than old_offset can also sync remained data
* into vmcore.
*/
old_offset = BUFSIZE_BITMAP * (last_pfn / PFN_BUFBITMAP);
new_offset = BUFSIZE_BITMAP * (pfn / PFN_BUFBITMAP);
while (old_offset < new_offset) {
/* calculate the offset and write dump_bitmap */
offset_bitmap1 = s->offset_dump_bitmap + old_offset;
if (write_buffer(s->fd, offset_bitmap1, buf,
BUFSIZE_BITMAP) < 0) {
return -1;
}
/* dump level 1 is chosen, so 1st and 2nd bitmap are same */
offset_bitmap2 = s->offset_dump_bitmap + s->len_dump_bitmap +
old_offset;
if (write_buffer(s->fd, offset_bitmap2, buf,
BUFSIZE_BITMAP) < 0) {
return -1;
}
memset(buf, 0, BUFSIZE_BITMAP);
old_offset += BUFSIZE_BITMAP;
}
/* get the exact place of the bit in the buf, and set it */
byte = (pfn % PFN_BUFBITMAP) / CHAR_BIT;
bit = (pfn % PFN_BUFBITMAP) % CHAR_BIT;
if (value) {
buf[byte] |= 1u << bit;
} else {
buf[byte] &= ~(1u << bit);
}
return 0;
}
/*
* exam every page and return the page frame number and the address of the page.
* bufptr can be NULL. note: the blocks here is supposed to reflect guest-phys
* blocks, so block->target_start and block->target_end should be interal
* multiples of the target page size.
*/
static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr,
uint8_t **bufptr, DumpState *s)
{
GuestPhysBlock *block = *blockptr;
hwaddr addr;
uint8_t *buf;
/* block == NULL means the start of the iteration */
if (!block) {
block = QTAILQ_FIRST(&s->guest_phys_blocks.head);
*blockptr = block;
assert(block->target_start % s->page_size == 0);
assert(block->target_end % s->page_size == 0);
*pfnptr = paddr_to_pfn(block->target_start, s->page_shift);
if (bufptr) {
*bufptr = block->host_addr;
}
return true;
}
*pfnptr = *pfnptr + 1;
addr = pfn_to_paddr(*pfnptr, s->page_shift);
if ((addr >= block->target_start) &&
(addr + s->page_size <= block->target_end)) {
buf = block->host_addr + (addr - block->target_start);
} else {
/* the next page is in the next block */
block = QTAILQ_NEXT(block, next);
*blockptr = block;
if (!block) {
return false;
}
assert(block->target_start % s->page_size == 0);
assert(block->target_end % s->page_size == 0);
*pfnptr = paddr_to_pfn(block->target_start, s->page_shift);
buf = block->host_addr;
}
if (bufptr) {
*bufptr = buf;
}
return true;
}
static int write_dump_bitmap(DumpState *s)
{
int ret = 0;
uint64_t last_pfn, pfn;
void *dump_bitmap_buf;
size_t num_dumpable;
GuestPhysBlock *block_iter = NULL;
/* dump_bitmap_buf is used to store dump_bitmap temporarily */
dump_bitmap_buf = g_malloc0(BUFSIZE_BITMAP);
num_dumpable = 0;
last_pfn = 0;
/*
* exam memory page by page, and set the bit in dump_bitmap corresponded
* to the existing page.
*/
while (get_next_page(&block_iter, &pfn, NULL, s)) {
ret = set_dump_bitmap(last_pfn, pfn, true, dump_bitmap_buf, s);
if (ret < 0) {
dump_error(s, "dump: failed to set dump_bitmap.\n");
ret = -1;
goto out;
}
last_pfn = pfn;
num_dumpable++;
}
/*
* set_dump_bitmap will always leave the recently set bit un-sync. Here we
* set last_pfn + PFN_BUFBITMAP to 0 and those set but un-sync bit will be
* synchronized into vmcore.
*/
if (num_dumpable > 0) {
ret = set_dump_bitmap(last_pfn, last_pfn + PFN_BUFBITMAP, false,
dump_bitmap_buf, s);
if (ret < 0) {
dump_error(s, "dump: failed to sync dump_bitmap.\n");
ret = -1;
goto out;
}
}
/* number of dumpable pages that will be dumped later */
s->num_dumpable = num_dumpable;
out:
g_free(dump_bitmap_buf);
return ret;
}
static void prepare_data_cache(DataCache *data_cache, DumpState *s,
off_t offset)
{
data_cache->fd = s->fd;
data_cache->data_size = 0;
data_cache->buf_size = BUFSIZE_DATA_CACHE;
data_cache->buf = g_malloc0(BUFSIZE_DATA_CACHE);
data_cache->offset = offset;
}
static int write_cache(DataCache *dc, const void *buf, size_t size,
bool flag_sync)
{
/*
* dc->buf_size should not be less than size, otherwise dc will never be
* enough
*/
assert(size <= dc->buf_size);
/*
* if flag_sync is set, synchronize data in dc->buf into vmcore.
* otherwise check if the space is enough for caching data in buf, if not,
* write the data in dc->buf to dc->fd and reset dc->buf
*/
if ((!flag_sync && dc->data_size + size > dc->buf_size) ||
(flag_sync && dc->data_size > 0)) {
if (write_buffer(dc->fd, dc->offset, dc->buf, dc->data_size) < 0) {
return -1;
}
dc->offset += dc->data_size;
dc->data_size = 0;
}
if (!flag_sync) {
memcpy(dc->buf + dc->data_size, buf, size);
dc->data_size += size;
}
return 0;
}
static void free_data_cache(DataCache *data_cache)
{
g_free(data_cache->buf);
}
static size_t get_len_buf_out(size_t page_size, uint32_t flag_compress)
{
size_t len_buf_out_zlib, len_buf_out_lzo, len_buf_out_snappy;
size_t len_buf_out;
/* init buf_out */
len_buf_out_zlib = len_buf_out_lzo = len_buf_out_snappy = 0;
/* buf size for zlib */
len_buf_out_zlib = compressBound(page_size);
/* buf size for lzo */
#ifdef CONFIG_LZO
if (flag_compress & DUMP_DH_COMPRESSED_LZO) {
if (lzo_init() != LZO_E_OK) {
/* return 0 to indicate lzo is unavailable */
return 0;
}
}
/*
* LZO will expand incompressible data by a little amount. please check the
* following URL to see the expansion calculation:
* http://www.oberhumer.com/opensource/lzo/lzofaq.php
*/
len_buf_out_lzo = page_size + page_size / 16 + 64 + 3;
#endif
#ifdef CONFIG_SNAPPY
/* buf size for snappy */
len_buf_out_snappy = snappy_max_compressed_length(page_size);
#endif
/* get the biggest that can store all kinds of compressed page */
len_buf_out = MAX(len_buf_out_zlib,
MAX(len_buf_out_lzo, len_buf_out_snappy));
return len_buf_out;
}
/*
* check if the page is all 0
*/
static inline bool is_zero_page(const uint8_t *buf, size_t page_size)
{
return buffer_is_zero(buf, page_size);
}
static int write_dump_pages(DumpState *s)
{
int ret = 0;
DataCache page_desc, page_data;
size_t len_buf_out, size_out;
#ifdef CONFIG_LZO
lzo_bytep wrkmem = NULL;
#endif
uint8_t *buf_out = NULL;
off_t offset_desc, offset_data;
PageDescriptor pd, pd_zero;
uint8_t *buf;
int endian = s->dump_info.d_endian;
GuestPhysBlock *block_iter = NULL;
uint64_t pfn_iter;
/* get offset of page_desc and page_data in dump file */
offset_desc = s->offset_page;
offset_data = offset_desc + sizeof(PageDescriptor) * s->num_dumpable;
prepare_data_cache(&page_desc, s, offset_desc);
prepare_data_cache(&page_data, s, offset_data);
/* prepare buffer to store compressed data */
len_buf_out = get_len_buf_out(s->page_size, s->flag_compress);
if (len_buf_out == 0) {
dump_error(s, "dump: failed to get length of output buffer.\n");
goto out;
}
#ifdef CONFIG_LZO
wrkmem = g_malloc(LZO1X_1_MEM_COMPRESS);
#endif
buf_out = g_malloc(len_buf_out);
/*
* init zero page's page_desc and page_data, because every zero page
* uses the same page_data
*/
pd_zero.size = cpu_convert_to_target32(s->page_size, endian);
pd_zero.flags = cpu_convert_to_target32(0, endian);
pd_zero.offset = cpu_convert_to_target64(offset_data, endian);
pd_zero.page_flags = cpu_convert_to_target64(0, endian);
buf = g_malloc0(s->page_size);
ret = write_cache(&page_data, buf, s->page_size, false);
g_free(buf);
if (ret < 0) {
dump_error(s, "dump: failed to write page data(zero page).\n");
goto out;
}
offset_data += s->page_size;
/*
* dump memory to vmcore page by page. zero page will all be resided in the
* first page of page section
*/
while (get_next_page(&block_iter, &pfn_iter, &buf, s)) {
/* check zero page */
if (is_zero_page(buf, s->page_size)) {
ret = write_cache(&page_desc, &pd_zero, sizeof(PageDescriptor),
false);
if (ret < 0) {
dump_error(s, "dump: failed to write page desc.\n");
goto out;
}
} else {
/*
* not zero page, then:
* 1. compress the page
* 2. write the compressed page into the cache of page_data
* 3. get page desc of the compressed page and write it into the
* cache of page_desc
*
* only one compression format will be used here, for
* s->flag_compress is set. But when compression fails to work,
* we fall back to save in plaintext.
*/
size_out = len_buf_out;
if ((s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) &&
(compress2(buf_out, (uLongf *)&size_out, buf, s->page_size,
Z_BEST_SPEED) == Z_OK) && (size_out < s->page_size)) {
pd.flags = cpu_convert_to_target32(DUMP_DH_COMPRESSED_ZLIB,
endian);
pd.size = cpu_convert_to_target32(size_out, endian);
ret = write_cache(&page_data, buf_out, size_out, false);
if (ret < 0) {
dump_error(s, "dump: failed to write page data.\n");
goto out;
}
#ifdef CONFIG_LZO
} else if ((s->flag_compress & DUMP_DH_COMPRESSED_LZO) &&
(lzo1x_1_compress(buf, s->page_size, buf_out,
(lzo_uint *)&size_out, wrkmem) == LZO_E_OK) &&
(size_out < s->page_size)) {
pd.flags = cpu_convert_to_target32(DUMP_DH_COMPRESSED_LZO,
endian);
pd.size = cpu_convert_to_target32(size_out, endian);
ret = write_cache(&page_data, buf_out, size_out, false);
if (ret < 0) {
dump_error(s, "dump: failed to write page data.\n");
goto out;
}
#endif
#ifdef CONFIG_SNAPPY
} else if ((s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) &&
(snappy_compress((char *)buf, s->page_size,
(char *)buf_out, &size_out) == SNAPPY_OK) &&
(size_out < s->page_size)) {
pd.flags = cpu_convert_to_target32(
DUMP_DH_COMPRESSED_SNAPPY, endian);
pd.size = cpu_convert_to_target32(size_out, endian);
ret = write_cache(&page_data, buf_out, size_out, false);
if (ret < 0) {
dump_error(s, "dump: failed to write page data.\n");
goto out;
}
#endif
} else {
/*
* fall back to save in plaintext, size_out should be
* assigned to s->page_size
*/
pd.flags = cpu_convert_to_target32(0, endian);
size_out = s->page_size;
pd.size = cpu_convert_to_target32(size_out, endian);
ret = write_cache(&page_data, buf, s->page_size, false);
if (ret < 0) {
dump_error(s, "dump: failed to write page data.\n");
goto out;
}
}
/* get and write page desc here */
pd.page_flags = cpu_convert_to_target64(0, endian);
pd.offset = cpu_convert_to_target64(offset_data, endian);
offset_data += size_out;
ret = write_cache(&page_desc, &pd, sizeof(PageDescriptor), false);
if (ret < 0) {
dump_error(s, "dump: failed to write page desc.\n");
goto out;
}
}
}
ret = write_cache(&page_desc, NULL, 0, true);
if (ret < 0) {
dump_error(s, "dump: failed to sync cache for page_desc.\n");
goto out;
}
ret = write_cache(&page_data, NULL, 0, true);
if (ret < 0) {
dump_error(s, "dump: failed to sync cache for page_data.\n");
goto out;
}
out:
free_data_cache(&page_desc);
free_data_cache(&page_data);
#ifdef CONFIG_LZO
g_free(wrkmem);
#endif
g_free(buf_out);
return ret;
}
static int create_kdump_vmcore(DumpState *s)
{
int ret;
/*
* the kdump-compressed format is:
* File offset
* +------------------------------------------+ 0x0
* | main header (struct disk_dump_header) |
* |------------------------------------------+ block 1
* | sub header (struct kdump_sub_header) |
* |------------------------------------------+ block 2
* | 1st-dump_bitmap |
* |------------------------------------------+ block 2 + X blocks
* | 2nd-dump_bitmap | (aligned by block)
* |------------------------------------------+ block 2 + 2 * X blocks
* | page desc for pfn 0 (struct page_desc) | (aligned by block)
* | page desc for pfn 1 (struct page_desc) |
* | : |
* |------------------------------------------| (not aligned by block)
* | page data (pfn 0) |
* | page data (pfn 1) |
* | : |
* +------------------------------------------+
*/
ret = write_start_flat_header(s->fd);
if (ret < 0) {
dump_error(s, "dump: failed to write start flat header.\n");
return -1;
}
ret = write_dump_header(s);
if (ret < 0) {
return -1;
}
ret = write_dump_bitmap(s);
if (ret < 0) {
return -1;
}
ret = write_dump_pages(s);
if (ret < 0) {
return -1;
}
ret = write_end_flat_header(s->fd);
if (ret < 0) {
dump_error(s, "dump: failed to write end flat header.\n");
return -1;
}
dump_completed(s);
return 0;
}
static ram_addr_t get_start_block(DumpState *s)
{
GuestPhysBlock *block;
if (!s->has_filter) {
s->next_block = QTAILQ_FIRST(&s->guest_phys_blocks.head);
return 0;
}
QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) {
if (block->target_start >= s->begin + s->length ||
block->target_end <= s->begin) {
/* This block is out of the range */
continue;
}
s->next_block = block;
if (s->begin > block->target_start) {
s->start = s->begin - block->target_start;
} else {
s->start = 0;
}
return s->start;
}
return -1;
}
static void get_max_mapnr(DumpState *s)
{
GuestPhysBlock *last_block;
last_block = QTAILQ_LAST(&s->guest_phys_blocks.head, GuestPhysBlockHead);
s->max_mapnr = paddr_to_pfn(last_block->target_end, s->page_shift);
}
static int dump_init(DumpState *s, int fd, bool has_format,
DumpGuestMemoryFormat format, bool paging, bool has_filter,
int64_t begin, int64_t length, Error **errp)
{
CPUState *cpu;
int nr_cpus;
Error *err = NULL;
int ret;
/* kdump-compressed is conflict with paging and filter */
if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) {
assert(!paging && !has_filter);
}
if (runstate_is_running()) {
vm_stop(RUN_STATE_SAVE_VM);
s->resume = true;
} else {
s->resume = false;
}
/* If we use KVM, we should synchronize the registers before we get dump
* info or physmap info.
*/
cpu_synchronize_all_states();
nr_cpus = 0;
CPU_FOREACH(cpu) {
nr_cpus++;
}
s->fd = fd;
s->has_filter = has_filter;
s->begin = begin;
s->length = length;
guest_phys_blocks_init(&s->guest_phys_blocks);
guest_phys_blocks_append(&s->guest_phys_blocks);
s->start = get_start_block(s);
if (s->start == -1) {
error_set(errp, QERR_INVALID_PARAMETER, "begin");
goto cleanup;
}
/* get dump info: endian, class and architecture.
* If the target architecture is not supported, cpu_get_dump_info() will
* return -1.
*/
ret = cpu_get_dump_info(&s->dump_info, &s->guest_phys_blocks);
if (ret < 0) {
error_set(errp, QERR_UNSUPPORTED);
goto cleanup;
}
s->note_size = cpu_get_note_size(s->dump_info.d_class,
s->dump_info.d_machine, nr_cpus);
if (s->note_size < 0) {
error_set(errp, QERR_UNSUPPORTED);
goto cleanup;
}
/* get memory mapping */
memory_mapping_list_init(&s->list);
if (paging) {
qemu_get_guest_memory_mapping(&s->list, &s->guest_phys_blocks, &err);
if (err != NULL) {
error_propagate(errp, err);
goto cleanup;
}
} else {
qemu_get_guest_simple_memory_mapping(&s->list, &s->guest_phys_blocks);
}
s->nr_cpus = nr_cpus;
s->page_size = TARGET_PAGE_SIZE;
s->page_shift = ffs(s->page_size) - 1;
get_max_mapnr(s);
uint64_t tmp;
tmp = DIV_ROUND_UP(DIV_ROUND_UP(s->max_mapnr, CHAR_BIT), s->page_size);
s->len_dump_bitmap = tmp * s->page_size;
/* init for kdump-compressed format */
if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) {
switch (format) {
case DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB:
s->flag_compress = DUMP_DH_COMPRESSED_ZLIB;
break;
case DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO:
s->flag_compress = DUMP_DH_COMPRESSED_LZO;
break;
case DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY:
s->flag_compress = DUMP_DH_COMPRESSED_SNAPPY;
break;
default:
s->flag_compress = 0;
}
return 0;
}
if (s->has_filter) {
memory_mapping_filter(&s->list, s->begin, s->length);
}
/*
* calculate phdr_num
*
* the type of ehdr->e_phnum is uint16_t, so we should avoid overflow
*/
s->phdr_num = 1; /* PT_NOTE */
if (s->list.num < UINT16_MAX - 2) {
s->phdr_num += s->list.num;
s->have_section = false;
} else {
s->have_section = true;
s->phdr_num = PN_XNUM;
s->sh_info = 1; /* PT_NOTE */
/* the type of shdr->sh_info is uint32_t, so we should avoid overflow */
if (s->list.num <= UINT32_MAX - 1) {
s->sh_info += s->list.num;
} else {
s->sh_info = UINT32_MAX;
}
}
if (s->dump_info.d_class == ELFCLASS64) {
if (s->have_section) {
s->memory_offset = sizeof(Elf64_Ehdr) +
sizeof(Elf64_Phdr) * s->sh_info +
sizeof(Elf64_Shdr) + s->note_size;
} else {
s->memory_offset = sizeof(Elf64_Ehdr) +
sizeof(Elf64_Phdr) * s->phdr_num + s->note_size;
}
} else {
if (s->have_section) {
s->memory_offset = sizeof(Elf32_Ehdr) +
sizeof(Elf32_Phdr) * s->sh_info +
sizeof(Elf32_Shdr) + s->note_size;
} else {
s->memory_offset = sizeof(Elf32_Ehdr) +
sizeof(Elf32_Phdr) * s->phdr_num + s->note_size;
}
}
return 0;
cleanup:
guest_phys_blocks_free(&s->guest_phys_blocks);
if (s->resume) {
vm_start();
}
return -1;
}
void qmp_dump_guest_memory(bool paging, const char *file, bool has_begin,
int64_t begin, bool has_length,
int64_t length, bool has_format,
DumpGuestMemoryFormat format, Error **errp)
{
const char *p;
int fd = -1;
DumpState *s;
int ret;
/*
* kdump-compressed format need the whole memory dumped, so paging or
* filter is not supported here.
*/
if ((has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) &&
(paging || has_begin || has_length)) {
error_setg(errp, "kdump-compressed format doesn't support paging or "
"filter");
return;
}
if (has_begin && !has_length) {
error_set(errp, QERR_MISSING_PARAMETER, "length");
return;
}
if (!has_begin && has_length) {
error_set(errp, QERR_MISSING_PARAMETER, "begin");
return;
}
/* check whether lzo/snappy is supported */
#ifndef CONFIG_LZO
if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO) {
error_setg(errp, "kdump-lzo is not available now");
return;
}
#endif
#ifndef CONFIG_SNAPPY
if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY) {
error_setg(errp, "kdump-snappy is not available now");
return;
}
#endif
#if !defined(WIN32)
if (strstart(file, "fd:", &p)) {
fd = monitor_get_fd(cur_mon, p, errp);
if (fd == -1) {
return;
}
}
#endif
if (strstart(file, "file:", &p)) {
fd = qemu_open(p, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRUSR);
if (fd < 0) {
error_setg_file_open(errp, errno, p);
return;
}
}
if (fd == -1) {
error_set(errp, QERR_INVALID_PARAMETER, "protocol");
return;
}
s = g_malloc0(sizeof(DumpState));
ret = dump_init(s, fd, has_format, format, paging, has_begin,
begin, length, errp);
if (ret < 0) {
g_free(s);
return;
}
if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) {
if (create_kdump_vmcore(s) < 0) {
error_set(errp, QERR_IO_ERROR);
}
} else {
if (create_vmcore(s) < 0) {
error_set(errp, QERR_IO_ERROR);
}
}
g_free(s);
}
DumpGuestMemoryCapability *qmp_query_dump_guest_memory_capability(Error **errp)
{
DumpGuestMemoryFormatList *item;
DumpGuestMemoryCapability *cap =
g_malloc0(sizeof(DumpGuestMemoryCapability));
/* elf is always available */
item = g_malloc0(sizeof(DumpGuestMemoryFormatList));
cap->formats = item;
item->value = DUMP_GUEST_MEMORY_FORMAT_ELF;
/* kdump-zlib is always available */
item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList));
item = item->next;
item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB;
/* add new item if kdump-lzo is available */
#ifdef CONFIG_LZO
item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList));
item = item->next;
item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO;
#endif
/* add new item if kdump-snappy is available */
#ifdef CONFIG_SNAPPY
item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList));
item = item->next;
item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY;
#endif
return cap;
}
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