qemu/dump.c
Laszlo Ersek 56c4bfb3f0 dump: rebase from host-private RAMBlock offsets to guest-physical addresses
RAMBlock.offset                   --> GuestPhysBlock.target_start
RAMBlock.offset + RAMBlock.length --> GuestPhysBlock.target_end
RAMBlock.length                   --> GuestPhysBlock.target_end -
                                      GuestPhysBlock.target_start

"GuestPhysBlock.host_addr" is only used when writing the dump contents.

This patch enables "crash" to work with the vmcore by rebasing the vmcore
from the left side of the following diagram to the right side:

host-private
offset
relative
to ram_addr   RAMBlock                  guest-visible paddrs
            0 +-------------------+.....+-------------------+ 0
              |         ^         |     |        ^          |
              |       640 KB      |     |      640 KB       |
              |         v         |     |        v          |
  0x0000a0000 +-------------------+.....+-------------------+ 0x0000a0000
              |         ^         |     |XXXXXXXXXXXXXXXXXXX|
              |       384 KB      |     |XXXXXXXXXXXXXXXXXXX|
              |         v         |     |XXXXXXXXXXXXXXXXXXX|
  0x000100000 +-------------------+.....+-------------------+ 0x000100000
              |         ^         |     |        ^          |
              |       3583 MB     |     |      3583 MB      |
              |         v         |     |        v          |
  0x0e0000000 +-------------------+.....+-------------------+ 0x0e0000000
              |         ^         |.    |XXXXXXXXXXXXXXXXXXX|
              | above_4g_mem_size | .   |XXXX PCI hole XXXXX|
              |         v         |  .  |XXXX          XXXXX|
     ram_size +-------------------+   . |XXXX  512 MB  XXXXX|
                                   .   .|XXXXXXXXXXXXXXXXXXX|
                                    .   +-------------------+ 0x100000000
                                     .  |         ^         |
                                      . | above_4g_mem_size |
                                       .|         v         |
                                        +-------------------+ ram_size
                                                              + 512 MB

Related RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=981582

Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2013-08-08 11:01:46 -04:00

897 lines
23 KiB
C

/*
* 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"
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;
size_t note_size;
hwaddr memory_offset;
int fd;
GuestPhysBlock *next_block;
ram_addr_t start;
bool has_filter;
int64_t begin;
int64_t length;
Error **errp;
} 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(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(DumpState *s)
{
CPUState *cpu;
int ret;
int id;
for (cpu = first_cpu; cpu != NULL; cpu = cpu->next_cpu) {
id = cpu_index(cpu);
ret = cpu_write_elf64_note(fd_write_vmcore, cpu, id, s);
if (ret < 0) {
dump_error(s, "dump: failed to write elf notes.\n");
return -1;
}
}
for (cpu = first_cpu; cpu != NULL; cpu = cpu->next_cpu) {
ret = cpu_write_elf64_qemunote(fd_write_vmcore, 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(DumpState *s)
{
CPUState *cpu;
int ret;
int id;
for (cpu = first_cpu; cpu != NULL; cpu = cpu->next_cpu) {
id = cpu_index(cpu);
ret = cpu_write_elf32_note(fd_write_vmcore, cpu, id, s);
if (ret < 0) {
dump_error(s, "dump: failed to write elf notes.\n");
return -1;
}
}
for (cpu = first_cpu; cpu != NULL; cpu = cpu->next_cpu) {
ret = cpu_write_elf32_qemunote(fd_write_vmcore, 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(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(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 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 int dump_init(DumpState *s, int fd, bool paging, bool has_filter,
int64_t begin, int64_t length, Error **errp)
{
CPUState *cpu;
int nr_cpus;
Error *err = NULL;
int ret;
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;
for (cpu = first_cpu; cpu != NULL; cpu = cpu->next_cpu) {
nr_cpus++;
}
s->errp = errp;
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 (ret < 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);
}
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,
Error **errp)
{
const char *p;
int fd = -1;
DumpState *s;
int ret;
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;
}
#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, paging, has_begin, begin, length, errp);
if (ret < 0) {
g_free(s);
return;
}
if (create_vmcore(s) < 0 && !error_is_set(s->errp)) {
error_set(errp, QERR_IO_ERROR);
}
g_free(s);
}