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/*
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* QEMU dump
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*
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* Copyright Fujitsu, Corp. 2011, 2012
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*
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* Authors:
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* Wen Congyang <wency@cn.fujitsu.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu-common.h" |
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#include "elf.h" |
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#include "cpu.h" |
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#include "exec/cpu-all.h" |
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#include "exec/hwaddr.h" |
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#include "monitor/monitor.h" |
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#include "sysemu/kvm.h" |
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#include "sysemu/dump.h" |
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#include "sysemu/sysemu.h" |
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#include "sysemu/memory_mapping.h" |
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#include "sysemu/cpus.h" |
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#include "qapi/error.h" |
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#include "qmp-commands.h" |
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|
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#include <zlib.h> |
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#ifdef CONFIG_LZO
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#include <lzo/lzo1x.h> |
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#endif
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#ifdef CONFIG_SNAPPY
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#include <snappy-c.h> |
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#endif
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#ifndef ELF_MACHINE_UNAME
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#define ELF_MACHINE_UNAME "Unknown" |
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#endif
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static uint16_t cpu_convert_to_target16(uint16_t val, int endian) |
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{
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if (endian == ELFDATA2LSB) {
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val = cpu_to_le16(val); |
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} else {
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val = cpu_to_be16(val); |
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} |
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return val;
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} |
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|
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static uint32_t cpu_convert_to_target32(uint32_t val, int endian) |
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{
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if (endian == ELFDATA2LSB) {
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val = cpu_to_le32(val); |
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} else {
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val = cpu_to_be32(val); |
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} |
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return val;
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} |
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static uint64_t cpu_convert_to_target64(uint64_t val, int endian) |
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{
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if (endian == ELFDATA2LSB) {
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val = cpu_to_le64(val); |
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} else {
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val = cpu_to_be64(val); |
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} |
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return val;
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} |
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|
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typedef struct DumpState { |
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GuestPhysBlockList guest_phys_blocks; |
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ArchDumpInfo dump_info; |
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MemoryMappingList list; |
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uint16_t phdr_num; |
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uint32_t sh_info; |
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bool have_section;
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bool resume;
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ssize_t note_size; |
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hwaddr memory_offset; |
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int fd;
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|
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GuestPhysBlock *next_block; |
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ram_addr_t start; |
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bool has_filter;
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int64_t begin; |
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int64_t length; |
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Error **errp; |
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uint8_t *note_buf; /* buffer for notes */
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size_t note_buf_offset; /* the writing place in note_buf */
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uint32_t nr_cpus; /* number of guest's cpu */
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size_t page_size; /* guest's page size */
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uint32_t page_shift; /* guest's page shift */
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uint64_t max_mapnr; /* the biggest guest's phys-mem's number */
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size_t len_dump_bitmap; /* the size of the place used to store
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dump_bitmap in vmcore */
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off_t offset_dump_bitmap; /* offset of dump_bitmap part in vmcore */
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off_t offset_page; /* offset of page part in vmcore */
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size_t num_dumpable; /* number of page that can be dumped */
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uint32_t flag_compress; /* indicate the compression format */
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} DumpState; |
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static int dump_cleanup(DumpState *s) |
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{
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int ret = 0; |
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guest_phys_blocks_free(&s->guest_phys_blocks); |
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memory_mapping_list_free(&s->list); |
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if (s->fd != -1) { |
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close(s->fd); |
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} |
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if (s->resume) {
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vm_start(); |
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} |
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return ret;
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} |
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static void dump_error(DumpState *s, const char *reason) |
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{
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dump_cleanup(s); |
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} |
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static int fd_write_vmcore(const void *buf, size_t size, void *opaque) |
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{
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DumpState *s = opaque; |
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size_t written_size; |
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written_size = qemu_write_full(s->fd, buf, size); |
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if (written_size != size) {
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return -1; |
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} |
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return 0; |
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} |
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static int write_elf64_header(DumpState *s) |
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{
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Elf64_Ehdr elf_header; |
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int ret;
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int endian = s->dump_info.d_endian;
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memset(&elf_header, 0, sizeof(Elf64_Ehdr)); |
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memcpy(&elf_header, ELFMAG, SELFMAG); |
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elf_header.e_ident[EI_CLASS] = ELFCLASS64; |
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elf_header.e_ident[EI_DATA] = s->dump_info.d_endian; |
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elf_header.e_ident[EI_VERSION] = EV_CURRENT; |
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elf_header.e_type = cpu_convert_to_target16(ET_CORE, endian); |
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elf_header.e_machine = cpu_convert_to_target16(s->dump_info.d_machine, |
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endian); |
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elf_header.e_version = cpu_convert_to_target32(EV_CURRENT, endian); |
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elf_header.e_ehsize = cpu_convert_to_target16(sizeof(elf_header), endian);
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elf_header.e_phoff = cpu_convert_to_target64(sizeof(Elf64_Ehdr), endian);
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elf_header.e_phentsize = cpu_convert_to_target16(sizeof(Elf64_Phdr),
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endian); |
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elf_header.e_phnum = cpu_convert_to_target16(s->phdr_num, endian); |
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if (s->have_section) {
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uint64_t shoff = sizeof(Elf64_Ehdr) + sizeof(Elf64_Phdr) * s->sh_info; |
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elf_header.e_shoff = cpu_convert_to_target64(shoff, endian); |
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elf_header.e_shentsize = cpu_convert_to_target16(sizeof(Elf64_Shdr),
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endian); |
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elf_header.e_shnum = cpu_convert_to_target16(1, endian);
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} |
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ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s);
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if (ret < 0) { |
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dump_error(s, "dump: failed to write elf header.\n");
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return -1; |
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} |
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return 0; |
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} |
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static int write_elf32_header(DumpState *s) |
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{
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Elf32_Ehdr elf_header; |
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int ret;
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int endian = s->dump_info.d_endian;
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memset(&elf_header, 0, sizeof(Elf32_Ehdr)); |
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memcpy(&elf_header, ELFMAG, SELFMAG); |
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elf_header.e_ident[EI_CLASS] = ELFCLASS32; |
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elf_header.e_ident[EI_DATA] = endian; |
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elf_header.e_ident[EI_VERSION] = EV_CURRENT; |
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elf_header.e_type = cpu_convert_to_target16(ET_CORE, endian); |
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elf_header.e_machine = cpu_convert_to_target16(s->dump_info.d_machine, |
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endian); |
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elf_header.e_version = cpu_convert_to_target32(EV_CURRENT, endian); |
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elf_header.e_ehsize = cpu_convert_to_target16(sizeof(elf_header), endian);
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elf_header.e_phoff = cpu_convert_to_target32(sizeof(Elf32_Ehdr), endian);
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elf_header.e_phentsize = cpu_convert_to_target16(sizeof(Elf32_Phdr),
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endian); |
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elf_header.e_phnum = cpu_convert_to_target16(s->phdr_num, endian); |
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if (s->have_section) {
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uint32_t shoff = sizeof(Elf32_Ehdr) + sizeof(Elf32_Phdr) * s->sh_info; |
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elf_header.e_shoff = cpu_convert_to_target32(shoff, endian); |
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elf_header.e_shentsize = cpu_convert_to_target16(sizeof(Elf32_Shdr),
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endian); |
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elf_header.e_shnum = cpu_convert_to_target16(1, endian);
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} |
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ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s);
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if (ret < 0) { |
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dump_error(s, "dump: failed to write elf header.\n");
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return -1; |
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} |
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return 0; |
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} |
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static int write_elf64_load(DumpState *s, MemoryMapping *memory_mapping, |
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int phdr_index, hwaddr offset,
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hwaddr filesz) |
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{
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Elf64_Phdr phdr; |
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int ret;
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int endian = s->dump_info.d_endian;
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memset(&phdr, 0, sizeof(Elf64_Phdr)); |
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phdr.p_type = cpu_convert_to_target32(PT_LOAD, endian); |
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phdr.p_offset = cpu_convert_to_target64(offset, endian); |
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phdr.p_paddr = cpu_convert_to_target64(memory_mapping->phys_addr, endian); |
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phdr.p_filesz = cpu_convert_to_target64(filesz, endian); |
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phdr.p_memsz = cpu_convert_to_target64(memory_mapping->length, endian); |
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phdr.p_vaddr = cpu_convert_to_target64(memory_mapping->virt_addr, endian); |
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assert(memory_mapping->length >= filesz); |
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|
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ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s);
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if (ret < 0) { |
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dump_error(s, "dump: failed to write program header table.\n");
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return -1; |
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} |
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return 0; |
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} |
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|
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static int write_elf32_load(DumpState *s, MemoryMapping *memory_mapping, |
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int phdr_index, hwaddr offset,
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hwaddr filesz) |
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{
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Elf32_Phdr phdr; |
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int ret;
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int endian = s->dump_info.d_endian;
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memset(&phdr, 0, sizeof(Elf32_Phdr)); |
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phdr.p_type = cpu_convert_to_target32(PT_LOAD, endian); |
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phdr.p_offset = cpu_convert_to_target32(offset, endian); |
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phdr.p_paddr = cpu_convert_to_target32(memory_mapping->phys_addr, endian); |
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phdr.p_filesz = cpu_convert_to_target32(filesz, endian); |
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phdr.p_memsz = cpu_convert_to_target32(memory_mapping->length, endian); |
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phdr.p_vaddr = cpu_convert_to_target32(memory_mapping->virt_addr, endian); |
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assert(memory_mapping->length >= filesz); |
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ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s);
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if (ret < 0) { |
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dump_error(s, "dump: failed to write program header table.\n");
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return -1; |
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} |
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return 0; |
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} |
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|
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static int write_elf64_note(DumpState *s) |
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{
|
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Elf64_Phdr phdr; |
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int endian = s->dump_info.d_endian;
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hwaddr begin = s->memory_offset - s->note_size; |
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int ret;
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memset(&phdr, 0, sizeof(Elf64_Phdr)); |
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phdr.p_type = cpu_convert_to_target32(PT_NOTE, endian); |
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phdr.p_offset = cpu_convert_to_target64(begin, endian); |
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phdr.p_paddr = 0;
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phdr.p_filesz = cpu_convert_to_target64(s->note_size, endian); |
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phdr.p_memsz = cpu_convert_to_target64(s->note_size, endian); |
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phdr.p_vaddr = 0;
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ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s);
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if (ret < 0) { |
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dump_error(s, "dump: failed to write program header table.\n");
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return -1; |
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} |
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|
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return 0; |
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} |
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|
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static inline int cpu_index(CPUState *cpu) |
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{
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return cpu->cpu_index + 1; |
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} |
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|
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static int write_elf64_notes(WriteCoreDumpFunction f, DumpState *s) |
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{
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CPUState *cpu; |
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int ret;
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int id;
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CPU_FOREACH(cpu) {
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id = cpu_index(cpu); |
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ret = cpu_write_elf64_note(f, cpu, id, s); |
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if (ret < 0) { |
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dump_error(s, "dump: failed to write elf notes.\n");
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return -1; |
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} |
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} |
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|
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CPU_FOREACH(cpu) {
|
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ret = cpu_write_elf64_qemunote(f, cpu, s); |
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if (ret < 0) { |
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dump_error(s, "dump: failed to write CPU status.\n");
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return -1; |
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} |
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} |
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return 0; |
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} |
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|
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static int write_elf32_note(DumpState *s) |
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{
|
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hwaddr begin = s->memory_offset - s->note_size; |
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Elf32_Phdr phdr; |
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int endian = s->dump_info.d_endian;
|
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int ret;
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memset(&phdr, 0, sizeof(Elf32_Phdr)); |
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phdr.p_type = cpu_convert_to_target32(PT_NOTE, endian); |
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phdr.p_offset = cpu_convert_to_target32(begin, endian); |
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phdr.p_paddr = 0;
|
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phdr.p_filesz = cpu_convert_to_target32(s->note_size, endian); |
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phdr.p_memsz = cpu_convert_to_target32(s->note_size, endian); |
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phdr.p_vaddr = 0;
|
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|
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ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s);
|
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if (ret < 0) { |
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dump_error(s, "dump: failed to write program header table.\n");
|
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return -1; |
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} |
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|
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return 0; |
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} |
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|
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static int write_elf32_notes(WriteCoreDumpFunction f, DumpState *s) |
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{
|
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CPUState *cpu; |
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int ret;
|
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int id;
|
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|
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CPU_FOREACH(cpu) {
|
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id = cpu_index(cpu); |
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ret = cpu_write_elf32_note(f, cpu, id, s); |
| 357 |
if (ret < 0) { |
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dump_error(s, "dump: failed to write elf notes.\n");
|
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return -1; |
| 360 |
} |
| 361 |
} |
| 362 |
|
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CPU_FOREACH(cpu) {
|
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ret = cpu_write_elf32_qemunote(f, cpu, s); |
| 365 |
if (ret < 0) { |
| 366 |
dump_error(s, "dump: failed to write CPU status.\n");
|
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return -1; |
| 368 |
} |
| 369 |
} |
| 370 |
|
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return 0; |
| 372 |
} |
| 373 |
|
| 374 |
static int write_elf_section(DumpState *s, int type) |
| 375 |
{
|
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Elf32_Shdr shdr32; |
| 377 |
Elf64_Shdr shdr64; |
| 378 |
int endian = s->dump_info.d_endian;
|
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int shdr_size;
|
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void *shdr;
|
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int ret;
|
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|
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if (type == 0) { |
| 384 |
shdr_size = sizeof(Elf32_Shdr);
|
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memset(&shdr32, 0, shdr_size);
|
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shdr32.sh_info = cpu_convert_to_target32(s->sh_info, endian); |
| 387 |
shdr = &shdr32; |
| 388 |
} else {
|
| 389 |
shdr_size = sizeof(Elf64_Shdr);
|
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memset(&shdr64, 0, shdr_size);
|
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shdr64.sh_info = cpu_convert_to_target32(s->sh_info, endian); |
| 392 |
shdr = &shdr64; |
| 393 |
} |
| 394 |
|
| 395 |
ret = fd_write_vmcore(&shdr, shdr_size, s); |
| 396 |
if (ret < 0) { |
| 397 |
dump_error(s, "dump: failed to write section header table.\n");
|
| 398 |
return -1; |
| 399 |
} |
| 400 |
|
| 401 |
return 0; |
| 402 |
} |
| 403 |
|
| 404 |
static int write_data(DumpState *s, void *buf, int length) |
| 405 |
{
|
| 406 |
int ret;
|
| 407 |
|
| 408 |
ret = fd_write_vmcore(buf, length, s); |
| 409 |
if (ret < 0) { |
| 410 |
dump_error(s, "dump: failed to save memory.\n");
|
| 411 |
return -1; |
| 412 |
} |
| 413 |
|
| 414 |
return 0; |
| 415 |
} |
| 416 |
|
| 417 |
/* write the memroy to vmcore. 1 page per I/O. */
|
| 418 |
static int write_memory(DumpState *s, GuestPhysBlock *block, ram_addr_t start, |
| 419 |
int64_t size) |
| 420 |
{
|
| 421 |
int64_t i; |
| 422 |
int ret;
|
| 423 |
|
| 424 |
for (i = 0; i < size / TARGET_PAGE_SIZE; i++) { |
| 425 |
ret = write_data(s, block->host_addr + start + i * TARGET_PAGE_SIZE, |
| 426 |
TARGET_PAGE_SIZE); |
| 427 |
if (ret < 0) { |
| 428 |
return ret;
|
| 429 |
} |
| 430 |
} |
| 431 |
|
| 432 |
if ((size % TARGET_PAGE_SIZE) != 0) { |
| 433 |
ret = write_data(s, block->host_addr + start + i * TARGET_PAGE_SIZE, |
| 434 |
size % TARGET_PAGE_SIZE); |
| 435 |
if (ret < 0) { |
| 436 |
return ret;
|
| 437 |
} |
| 438 |
} |
| 439 |
|
| 440 |
return 0; |
| 441 |
} |
| 442 |
|
| 443 |
/* get the memory's offset and size in the vmcore */
|
| 444 |
static void get_offset_range(hwaddr phys_addr, |
| 445 |
ram_addr_t mapping_length, |
| 446 |
DumpState *s, |
| 447 |
hwaddr *p_offset, |
| 448 |
hwaddr *p_filesz) |
| 449 |
{
|
| 450 |
GuestPhysBlock *block; |
| 451 |
hwaddr offset = s->memory_offset; |
| 452 |
int64_t size_in_block, start; |
| 453 |
|
| 454 |
/* When the memory is not stored into vmcore, offset will be -1 */
|
| 455 |
*p_offset = -1;
|
| 456 |
*p_filesz = 0;
|
| 457 |
|
| 458 |
if (s->has_filter) {
|
| 459 |
if (phys_addr < s->begin || phys_addr >= s->begin + s->length) {
|
| 460 |
return;
|
| 461 |
} |
| 462 |
} |
| 463 |
|
| 464 |
QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) {
|
| 465 |
if (s->has_filter) {
|
| 466 |
if (block->target_start >= s->begin + s->length ||
|
| 467 |
block->target_end <= s->begin) {
|
| 468 |
/* This block is out of the range */
|
| 469 |
continue;
|
| 470 |
} |
| 471 |
|
| 472 |
if (s->begin <= block->target_start) {
|
| 473 |
start = block->target_start; |
| 474 |
} else {
|
| 475 |
start = s->begin; |
| 476 |
} |
| 477 |
|
| 478 |
size_in_block = block->target_end - start; |
| 479 |
if (s->begin + s->length < block->target_end) {
|
| 480 |
size_in_block -= block->target_end - (s->begin + s->length); |
| 481 |
} |
| 482 |
} else {
|
| 483 |
start = block->target_start; |
| 484 |
size_in_block = block->target_end - block->target_start; |
| 485 |
} |
| 486 |
|
| 487 |
if (phys_addr >= start && phys_addr < start + size_in_block) {
|
| 488 |
*p_offset = phys_addr - start + offset; |
| 489 |
|
| 490 |
/* The offset range mapped from the vmcore file must not spill over
|
| 491 |
* the GuestPhysBlock, clamp it. The rest of the mapping will be
|
| 492 |
* zero-filled in memory at load time; see
|
| 493 |
* <http://refspecs.linuxbase.org/elf/gabi4+/ch5.pheader.html>.
|
| 494 |
*/
|
| 495 |
*p_filesz = phys_addr + mapping_length <= start + size_in_block ? |
| 496 |
mapping_length : |
| 497 |
size_in_block - (phys_addr - start); |
| 498 |
return;
|
| 499 |
} |
| 500 |
|
| 501 |
offset += size_in_block; |
| 502 |
} |
| 503 |
} |
| 504 |
|
| 505 |
static int write_elf_loads(DumpState *s) |
| 506 |
{
|
| 507 |
hwaddr offset, filesz; |
| 508 |
MemoryMapping *memory_mapping; |
| 509 |
uint32_t phdr_index = 1;
|
| 510 |
int ret;
|
| 511 |
uint32_t max_index; |
| 512 |
|
| 513 |
if (s->have_section) {
|
| 514 |
max_index = s->sh_info; |
| 515 |
} else {
|
| 516 |
max_index = s->phdr_num; |
| 517 |
} |
| 518 |
|
| 519 |
QTAILQ_FOREACH(memory_mapping, &s->list.head, next) {
|
| 520 |
get_offset_range(memory_mapping->phys_addr, |
| 521 |
memory_mapping->length, |
| 522 |
s, &offset, &filesz); |
| 523 |
if (s->dump_info.d_class == ELFCLASS64) {
|
| 524 |
ret = write_elf64_load(s, memory_mapping, phdr_index++, offset, |
| 525 |
filesz); |
| 526 |
} else {
|
| 527 |
ret = write_elf32_load(s, memory_mapping, phdr_index++, offset, |
| 528 |
filesz); |
| 529 |
} |
| 530 |
|
| 531 |
if (ret < 0) { |
| 532 |
return -1; |
| 533 |
} |
| 534 |
|
| 535 |
if (phdr_index >= max_index) {
|
| 536 |
break;
|
| 537 |
} |
| 538 |
} |
| 539 |
|
| 540 |
return 0; |
| 541 |
} |
| 542 |
|
| 543 |
/* write elf header, PT_NOTE and elf note to vmcore. */
|
| 544 |
static int dump_begin(DumpState *s) |
| 545 |
{
|
| 546 |
int ret;
|
| 547 |
|
| 548 |
/*
|
| 549 |
* the vmcore's format is:
|
| 550 |
* --------------
|
| 551 |
* | elf header |
|
| 552 |
* --------------
|
| 553 |
* | PT_NOTE |
|
| 554 |
* --------------
|
| 555 |
* | PT_LOAD |
|
| 556 |
* --------------
|
| 557 |
* | ...... |
|
| 558 |
* --------------
|
| 559 |
* | PT_LOAD |
|
| 560 |
* --------------
|
| 561 |
* | sec_hdr |
|
| 562 |
* --------------
|
| 563 |
* | elf note |
|
| 564 |
* --------------
|
| 565 |
* | memory |
|
| 566 |
* --------------
|
| 567 |
*
|
| 568 |
* we only know where the memory is saved after we write elf note into
|
| 569 |
* vmcore.
|
| 570 |
*/
|
| 571 |
|
| 572 |
/* write elf header to vmcore */
|
| 573 |
if (s->dump_info.d_class == ELFCLASS64) {
|
| 574 |
ret = write_elf64_header(s); |
| 575 |
} else {
|
| 576 |
ret = write_elf32_header(s); |
| 577 |
} |
| 578 |
if (ret < 0) { |
| 579 |
return -1; |
| 580 |
} |
| 581 |
|
| 582 |
if (s->dump_info.d_class == ELFCLASS64) {
|
| 583 |
/* write PT_NOTE to vmcore */
|
| 584 |
if (write_elf64_note(s) < 0) { |
| 585 |
return -1; |
| 586 |
} |
| 587 |
|
| 588 |
/* write all PT_LOAD to vmcore */
|
| 589 |
if (write_elf_loads(s) < 0) { |
| 590 |
return -1; |
| 591 |
} |
| 592 |
|
| 593 |
/* write section to vmcore */
|
| 594 |
if (s->have_section) {
|
| 595 |
if (write_elf_section(s, 1) < 0) { |
| 596 |
return -1; |
| 597 |
} |
| 598 |
} |
| 599 |
|
| 600 |
/* write notes to vmcore */
|
| 601 |
if (write_elf64_notes(fd_write_vmcore, s) < 0) { |
| 602 |
return -1; |
| 603 |
} |
| 604 |
|
| 605 |
} else {
|
| 606 |
/* write PT_NOTE to vmcore */
|
| 607 |
if (write_elf32_note(s) < 0) { |
| 608 |
return -1; |
| 609 |
} |
| 610 |
|
| 611 |
/* write all PT_LOAD to vmcore */
|
| 612 |
if (write_elf_loads(s) < 0) { |
| 613 |
return -1; |
| 614 |
} |
| 615 |
|
| 616 |
/* write section to vmcore */
|
| 617 |
if (s->have_section) {
|
| 618 |
if (write_elf_section(s, 0) < 0) { |
| 619 |
return -1; |
| 620 |
} |
| 621 |
} |
| 622 |
|
| 623 |
/* write notes to vmcore */
|
| 624 |
if (write_elf32_notes(fd_write_vmcore, s) < 0) { |
| 625 |
return -1; |
| 626 |
} |
| 627 |
} |
| 628 |
|
| 629 |
return 0; |
| 630 |
} |
| 631 |
|
| 632 |
/* write PT_LOAD to vmcore */
|
| 633 |
static int dump_completed(DumpState *s) |
| 634 |
{
|
| 635 |
dump_cleanup(s); |
| 636 |
return 0; |
| 637 |
} |
| 638 |
|
| 639 |
static int get_next_block(DumpState *s, GuestPhysBlock *block) |
| 640 |
{
|
| 641 |
while (1) { |
| 642 |
block = QTAILQ_NEXT(block, next); |
| 643 |
if (!block) {
|
| 644 |
/* no more block */
|
| 645 |
return 1; |
| 646 |
} |
| 647 |
|
| 648 |
s->start = 0;
|
| 649 |
s->next_block = block; |
| 650 |
if (s->has_filter) {
|
| 651 |
if (block->target_start >= s->begin + s->length ||
|
| 652 |
block->target_end <= s->begin) {
|
| 653 |
/* This block is out of the range */
|
| 654 |
continue;
|
| 655 |
} |
| 656 |
|
| 657 |
if (s->begin > block->target_start) {
|
| 658 |
s->start = s->begin - block->target_start; |
| 659 |
} |
| 660 |
} |
| 661 |
|
| 662 |
return 0; |
| 663 |
} |
| 664 |
} |
| 665 |
|
| 666 |
/* write all memory to vmcore */
|
| 667 |
static int dump_iterate(DumpState *s) |
| 668 |
{
|
| 669 |
GuestPhysBlock *block; |
| 670 |
int64_t size; |
| 671 |
int ret;
|
| 672 |
|
| 673 |
while (1) { |
| 674 |
block = s->next_block; |
| 675 |
|
| 676 |
size = block->target_end - block->target_start; |
| 677 |
if (s->has_filter) {
|
| 678 |
size -= s->start; |
| 679 |
if (s->begin + s->length < block->target_end) {
|
| 680 |
size -= block->target_end - (s->begin + s->length); |
| 681 |
} |
| 682 |
} |
| 683 |
ret = write_memory(s, block, s->start, size); |
| 684 |
if (ret == -1) { |
| 685 |
return ret;
|
| 686 |
} |
| 687 |
|
| 688 |
ret = get_next_block(s, block); |
| 689 |
if (ret == 1) { |
| 690 |
dump_completed(s); |
| 691 |
return 0; |
| 692 |
} |
| 693 |
} |
| 694 |
} |
| 695 |
|
| 696 |
static int create_vmcore(DumpState *s) |
| 697 |
{
|
| 698 |
int ret;
|
| 699 |
|
| 700 |
ret = dump_begin(s); |
| 701 |
if (ret < 0) { |
| 702 |
return -1; |
| 703 |
} |
| 704 |
|
| 705 |
ret = dump_iterate(s); |
| 706 |
if (ret < 0) { |
| 707 |
return -1; |
| 708 |
} |
| 709 |
|
| 710 |
return 0; |
| 711 |
} |
| 712 |
|
| 713 |
static int write_start_flat_header(int fd) |
| 714 |
{
|
| 715 |
uint8_t *buf; |
| 716 |
MakedumpfileHeader mh; |
| 717 |
int ret = 0; |
| 718 |
|
| 719 |
memset(&mh, 0, sizeof(mh)); |
| 720 |
strncpy(mh.signature, MAKEDUMPFILE_SIGNATURE, |
| 721 |
strlen(MAKEDUMPFILE_SIGNATURE)); |
| 722 |
|
| 723 |
mh.type = cpu_to_be64(TYPE_FLAT_HEADER); |
| 724 |
mh.version = cpu_to_be64(VERSION_FLAT_HEADER); |
| 725 |
|
| 726 |
buf = g_malloc0(MAX_SIZE_MDF_HEADER); |
| 727 |
memcpy(buf, &mh, sizeof(mh));
|
| 728 |
|
| 729 |
size_t written_size; |
| 730 |
written_size = qemu_write_full(fd, buf, MAX_SIZE_MDF_HEADER); |
| 731 |
if (written_size != MAX_SIZE_MDF_HEADER) {
|
| 732 |
ret = -1;
|
| 733 |
} |
| 734 |
|
| 735 |
g_free(buf); |
| 736 |
return ret;
|
| 737 |
} |
| 738 |
|
| 739 |
static int write_end_flat_header(int fd) |
| 740 |
{
|
| 741 |
MakedumpfileDataHeader mdh; |
| 742 |
|
| 743 |
mdh.offset = END_FLAG_FLAT_HEADER; |
| 744 |
mdh.buf_size = END_FLAG_FLAT_HEADER; |
| 745 |
|
| 746 |
size_t written_size; |
| 747 |
written_size = qemu_write_full(fd, &mdh, sizeof(mdh));
|
| 748 |
if (written_size != sizeof(mdh)) { |
| 749 |
return -1; |
| 750 |
} |
| 751 |
|
| 752 |
return 0; |
| 753 |
} |
| 754 |
|
| 755 |
static int write_buffer(int fd, off_t offset, const void *buf, size_t size) |
| 756 |
{
|
| 757 |
size_t written_size; |
| 758 |
MakedumpfileDataHeader mdh; |
| 759 |
|
| 760 |
mdh.offset = cpu_to_be64(offset); |
| 761 |
mdh.buf_size = cpu_to_be64(size); |
| 762 |
|
| 763 |
written_size = qemu_write_full(fd, &mdh, sizeof(mdh));
|
| 764 |
if (written_size != sizeof(mdh)) { |
| 765 |
return -1; |
| 766 |
} |
| 767 |
|
| 768 |
written_size = qemu_write_full(fd, buf, size); |
| 769 |
if (written_size != size) {
|
| 770 |
return -1; |
| 771 |
} |
| 772 |
|
| 773 |
return 0; |
| 774 |
} |
| 775 |
|
| 776 |
static int buf_write_note(const void *buf, size_t size, void *opaque) |
| 777 |
{
|
| 778 |
DumpState *s = opaque; |
| 779 |
|
| 780 |
/* note_buf is not enough */
|
| 781 |
if (s->note_buf_offset + size > s->note_size) {
|
| 782 |
return -1; |
| 783 |
} |
| 784 |
|
| 785 |
memcpy(s->note_buf + s->note_buf_offset, buf, size); |
| 786 |
|
| 787 |
s->note_buf_offset += size; |
| 788 |
|
| 789 |
return 0; |
| 790 |
} |
| 791 |
|
| 792 |
/* write common header, sub header and elf note to vmcore */
|
| 793 |
static int create_header32(DumpState *s) |
| 794 |
{
|
| 795 |
int ret = 0; |
| 796 |
DiskDumpHeader32 *dh = NULL;
|
| 797 |
KdumpSubHeader32 *kh = NULL;
|
| 798 |
size_t size; |
| 799 |
int endian = s->dump_info.d_endian;
|
| 800 |
uint32_t block_size; |
| 801 |
uint32_t sub_hdr_size; |
| 802 |
uint32_t bitmap_blocks; |
| 803 |
uint32_t status = 0;
|
| 804 |
uint64_t offset_note; |
| 805 |
|
| 806 |
/* write common header, the version of kdump-compressed format is 6th */
|
| 807 |
size = sizeof(DiskDumpHeader32);
|
| 808 |
dh = g_malloc0(size); |
| 809 |
|
| 810 |
strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE)); |
| 811 |
dh->header_version = cpu_convert_to_target32(6, endian);
|
| 812 |
block_size = s->page_size; |
| 813 |
dh->block_size = cpu_convert_to_target32(block_size, endian); |
| 814 |
sub_hdr_size = sizeof(struct KdumpSubHeader32) + s->note_size; |
| 815 |
sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size); |
| 816 |
dh->sub_hdr_size = cpu_convert_to_target32(sub_hdr_size, endian); |
| 817 |
/* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */
|
| 818 |
dh->max_mapnr = cpu_convert_to_target32(MIN(s->max_mapnr, UINT_MAX), |
| 819 |
endian); |
| 820 |
dh->nr_cpus = cpu_convert_to_target32(s->nr_cpus, endian); |
| 821 |
bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2;
|
| 822 |
dh->bitmap_blocks = cpu_convert_to_target32(bitmap_blocks, endian); |
| 823 |
strncpy(dh->utsname.machine, ELF_MACHINE_UNAME, sizeof(dh->utsname.machine));
|
| 824 |
|
| 825 |
if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) {
|
| 826 |
status |= DUMP_DH_COMPRESSED_ZLIB; |
| 827 |
} |
| 828 |
#ifdef CONFIG_LZO
|
| 829 |
if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) {
|
| 830 |
status |= DUMP_DH_COMPRESSED_LZO; |
| 831 |
} |
| 832 |
#endif
|
| 833 |
#ifdef CONFIG_SNAPPY
|
| 834 |
if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) {
|
| 835 |
status |= DUMP_DH_COMPRESSED_SNAPPY; |
| 836 |
} |
| 837 |
#endif
|
| 838 |
dh->status = cpu_convert_to_target32(status, endian); |
| 839 |
|
| 840 |
if (write_buffer(s->fd, 0, dh, size) < 0) { |
| 841 |
dump_error(s, "dump: failed to write disk dump header.\n");
|
| 842 |
ret = -1;
|
| 843 |
goto out;
|
| 844 |
} |
| 845 |
|
| 846 |
/* write sub header */
|
| 847 |
size = sizeof(KdumpSubHeader32);
|
| 848 |
kh = g_malloc0(size); |
| 849 |
|
| 850 |
/* 64bit max_mapnr_64 */
|
| 851 |
kh->max_mapnr_64 = cpu_convert_to_target64(s->max_mapnr, endian); |
| 852 |
kh->phys_base = cpu_convert_to_target32(PHYS_BASE, endian); |
| 853 |
kh->dump_level = cpu_convert_to_target32(DUMP_LEVEL, endian); |
| 854 |
|
| 855 |
offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size; |
| 856 |
kh->offset_note = cpu_convert_to_target64(offset_note, endian); |
| 857 |
kh->note_size = cpu_convert_to_target32(s->note_size, endian); |
| 858 |
|
| 859 |
if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS *
|
| 860 |
block_size, kh, size) < 0) {
|
| 861 |
dump_error(s, "dump: failed to write kdump sub header.\n");
|
| 862 |
ret = -1;
|
| 863 |
goto out;
|
| 864 |
} |
| 865 |
|
| 866 |
/* write note */
|
| 867 |
s->note_buf = g_malloc0(s->note_size); |
| 868 |
s->note_buf_offset = 0;
|
| 869 |
|
| 870 |
/* use s->note_buf to store notes temporarily */
|
| 871 |
if (write_elf32_notes(buf_write_note, s) < 0) { |
| 872 |
ret = -1;
|
| 873 |
goto out;
|
| 874 |
} |
| 875 |
|
| 876 |
if (write_buffer(s->fd, offset_note, s->note_buf,
|
| 877 |
s->note_size) < 0) {
|
| 878 |
dump_error(s, "dump: failed to write notes");
|
| 879 |
ret = -1;
|
| 880 |
goto out;
|
| 881 |
} |
| 882 |
|
| 883 |
/* get offset of dump_bitmap */
|
| 884 |
s->offset_dump_bitmap = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size) * |
| 885 |
block_size; |
| 886 |
|
| 887 |
/* get offset of page */
|
| 888 |
s->offset_page = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size + bitmap_blocks) * |
| 889 |
block_size; |
| 890 |
|
| 891 |
out:
|
| 892 |
g_free(dh); |
| 893 |
g_free(kh); |
| 894 |
g_free(s->note_buf); |
| 895 |
|
| 896 |
return ret;
|
| 897 |
} |
| 898 |
|
| 899 |
/* write common header, sub header and elf note to vmcore */
|
| 900 |
static int create_header64(DumpState *s) |
| 901 |
{
|
| 902 |
int ret = 0; |
| 903 |
DiskDumpHeader64 *dh = NULL;
|
| 904 |
KdumpSubHeader64 *kh = NULL;
|
| 905 |
size_t size; |
| 906 |
int endian = s->dump_info.d_endian;
|
| 907 |
uint32_t block_size; |
| 908 |
uint32_t sub_hdr_size; |
| 909 |
uint32_t bitmap_blocks; |
| 910 |
uint32_t status = 0;
|
| 911 |
uint64_t offset_note; |
| 912 |
|
| 913 |
/* write common header, the version of kdump-compressed format is 6th */
|
| 914 |
size = sizeof(DiskDumpHeader64);
|
| 915 |
dh = g_malloc0(size); |
| 916 |
|
| 917 |
strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE)); |
| 918 |
dh->header_version = cpu_convert_to_target32(6, endian);
|
| 919 |
block_size = s->page_size; |
| 920 |
dh->block_size = cpu_convert_to_target32(block_size, endian); |
| 921 |
sub_hdr_size = sizeof(struct KdumpSubHeader64) + s->note_size; |
| 922 |
sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size); |
| 923 |
dh->sub_hdr_size = cpu_convert_to_target32(sub_hdr_size, endian); |
| 924 |
/* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */
|
| 925 |
dh->max_mapnr = cpu_convert_to_target32(MIN(s->max_mapnr, UINT_MAX), |
| 926 |
endian); |
| 927 |
dh->nr_cpus = cpu_convert_to_target32(s->nr_cpus, endian); |
| 928 |
bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2;
|
| 929 |
dh->bitmap_blocks = cpu_convert_to_target32(bitmap_blocks, endian); |
| 930 |
strncpy(dh->utsname.machine, ELF_MACHINE_UNAME, sizeof(dh->utsname.machine));
|
| 931 |
|
| 932 |
if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) {
|
| 933 |
status |= DUMP_DH_COMPRESSED_ZLIB; |
| 934 |
} |
| 935 |
#ifdef CONFIG_LZO
|
| 936 |
if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) {
|
| 937 |
status |= DUMP_DH_COMPRESSED_LZO; |
| 938 |
} |
| 939 |
#endif
|
| 940 |
#ifdef CONFIG_SNAPPY
|
| 941 |
if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) {
|
| 942 |
status |= DUMP_DH_COMPRESSED_SNAPPY; |
| 943 |
} |
| 944 |
#endif
|
| 945 |
dh->status = cpu_convert_to_target32(status, endian); |
| 946 |
|
| 947 |
if (write_buffer(s->fd, 0, dh, size) < 0) { |
| 948 |
dump_error(s, "dump: failed to write disk dump header.\n");
|
| 949 |
ret = -1;
|
| 950 |
goto out;
|
| 951 |
} |
| 952 |
|
| 953 |
/* write sub header */
|
| 954 |
size = sizeof(KdumpSubHeader64);
|
| 955 |
kh = g_malloc0(size); |
| 956 |
|
| 957 |
/* 64bit max_mapnr_64 */
|
| 958 |
kh->max_mapnr_64 = cpu_convert_to_target64(s->max_mapnr, endian); |
| 959 |
kh->phys_base = cpu_convert_to_target64(PHYS_BASE, endian); |
| 960 |
kh->dump_level = cpu_convert_to_target32(DUMP_LEVEL, endian); |
| 961 |
|
| 962 |
offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size; |
| 963 |
kh->offset_note = cpu_convert_to_target64(offset_note, endian); |
| 964 |
kh->note_size = cpu_convert_to_target64(s->note_size, endian); |
| 965 |
|
| 966 |
if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS *
|
| 967 |
block_size, kh, size) < 0) {
|
| 968 |
dump_error(s, "dump: failed to write kdump sub header.\n");
|
| 969 |
ret = -1;
|
| 970 |
goto out;
|
| 971 |
} |
| 972 |
|
| 973 |
/* write note */
|
| 974 |
s->note_buf = g_malloc0(s->note_size); |
| 975 |
s->note_buf_offset = 0;
|
| 976 |
|
| 977 |
/* use s->note_buf to store notes temporarily */
|
| 978 |
if (write_elf64_notes(buf_write_note, s) < 0) { |
| 979 |
ret = -1;
|
| 980 |
goto out;
|
| 981 |
} |
| 982 |
|
| 983 |
if (write_buffer(s->fd, offset_note, s->note_buf,
|
| 984 |
s->note_size) < 0) {
|
| 985 |
dump_error(s, "dump: failed to write notes");
|
| 986 |
ret = -1;
|
| 987 |
goto out;
|
| 988 |
} |
| 989 |
|
| 990 |
/* get offset of dump_bitmap */
|
| 991 |
s->offset_dump_bitmap = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size) * |
| 992 |
block_size; |
| 993 |
|
| 994 |
/* get offset of page */
|
| 995 |
s->offset_page = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size + bitmap_blocks) * |
| 996 |
block_size; |
| 997 |
|
| 998 |
out:
|
| 999 |
g_free(dh); |
| 1000 |
g_free(kh); |
| 1001 |
g_free(s->note_buf); |
| 1002 |
|
| 1003 |
return ret;
|
| 1004 |
} |
| 1005 |
|
| 1006 |
static int write_dump_header(DumpState *s) |
| 1007 |
{
|
| 1008 |
if (s->dump_info.d_machine == EM_386) {
|
| 1009 |
return create_header32(s);
|
| 1010 |
} else {
|
| 1011 |
return create_header64(s);
|
| 1012 |
} |
| 1013 |
} |
| 1014 |
|
| 1015 |
/*
|
| 1016 |
* set dump_bitmap sequencely. the bit before last_pfn is not allowed to be
|
| 1017 |
* rewritten, so if need to set the first bit, set last_pfn and pfn to 0.
|
| 1018 |
* set_dump_bitmap will always leave the recently set bit un-sync. And setting
|
| 1019 |
* (last bit + sizeof(buf) * 8) to 0 will do flushing the content in buf into
|
| 1020 |
* vmcore, ie. synchronizing un-sync bit into vmcore.
|
| 1021 |
*/
|
| 1022 |
static int set_dump_bitmap(uint64_t last_pfn, uint64_t pfn, bool value, |
| 1023 |
uint8_t *buf, DumpState *s) |
| 1024 |
{
|
| 1025 |
off_t old_offset, new_offset; |
| 1026 |
off_t offset_bitmap1, offset_bitmap2; |
| 1027 |
uint32_t byte, bit; |
| 1028 |
|
| 1029 |
/* should not set the previous place */
|
| 1030 |
assert(last_pfn <= pfn); |
| 1031 |
|
| 1032 |
/*
|
| 1033 |
* if the bit needed to be set is not cached in buf, flush the data in buf
|
| 1034 |
* to vmcore firstly.
|
| 1035 |
* making new_offset be bigger than old_offset can also sync remained data
|
| 1036 |
* into vmcore.
|
| 1037 |
*/
|
| 1038 |
old_offset = BUFSIZE_BITMAP * (last_pfn / PFN_BUFBITMAP); |
| 1039 |
new_offset = BUFSIZE_BITMAP * (pfn / PFN_BUFBITMAP); |
| 1040 |
|
| 1041 |
while (old_offset < new_offset) {
|
| 1042 |
/* calculate the offset and write dump_bitmap */
|
| 1043 |
offset_bitmap1 = s->offset_dump_bitmap + old_offset; |
| 1044 |
if (write_buffer(s->fd, offset_bitmap1, buf,
|
| 1045 |
BUFSIZE_BITMAP) < 0) {
|
| 1046 |
return -1; |
| 1047 |
} |
| 1048 |
|
| 1049 |
/* dump level 1 is chosen, so 1st and 2nd bitmap are same */
|
| 1050 |
offset_bitmap2 = s->offset_dump_bitmap + s->len_dump_bitmap + |
| 1051 |
old_offset; |
| 1052 |
if (write_buffer(s->fd, offset_bitmap2, buf,
|
| 1053 |
BUFSIZE_BITMAP) < 0) {
|
| 1054 |
return -1; |
| 1055 |
} |
| 1056 |
|
| 1057 |
memset(buf, 0, BUFSIZE_BITMAP);
|
| 1058 |
old_offset += BUFSIZE_BITMAP; |
| 1059 |
} |
| 1060 |
|
| 1061 |
/* get the exact place of the bit in the buf, and set it */
|
| 1062 |
byte = (pfn % PFN_BUFBITMAP) / CHAR_BIT; |
| 1063 |
bit = (pfn % PFN_BUFBITMAP) % CHAR_BIT; |
| 1064 |
if (value) {
|
| 1065 |
buf[byte] |= 1u << bit;
|
| 1066 |
} else {
|
| 1067 |
buf[byte] &= ~(1u << bit);
|
| 1068 |
} |
| 1069 |
|
| 1070 |
return 0; |
| 1071 |
} |
| 1072 |
|
| 1073 |
/*
|
| 1074 |
* exam every page and return the page frame number and the address of the page.
|
| 1075 |
* bufptr can be NULL. note: the blocks here is supposed to reflect guest-phys
|
| 1076 |
* blocks, so block->target_start and block->target_end should be interal
|
| 1077 |
* multiples of the target page size.
|
| 1078 |
*/
|
| 1079 |
static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr, |
| 1080 |
uint8_t **bufptr, DumpState *s) |
| 1081 |
{
|
| 1082 |
GuestPhysBlock *block = *blockptr; |
| 1083 |
hwaddr addr; |
| 1084 |
uint8_t *buf; |
| 1085 |
|
| 1086 |
/* block == NULL means the start of the iteration */
|
| 1087 |
if (!block) {
|
| 1088 |
block = QTAILQ_FIRST(&s->guest_phys_blocks.head); |
| 1089 |
*blockptr = block; |
| 1090 |
assert(block->target_start % s->page_size == 0);
|
| 1091 |
assert(block->target_end % s->page_size == 0);
|
| 1092 |
*pfnptr = paddr_to_pfn(block->target_start, s->page_shift); |
| 1093 |
if (bufptr) {
|
| 1094 |
*bufptr = block->host_addr; |
| 1095 |
} |
| 1096 |
return true; |
| 1097 |
} |
| 1098 |
|
| 1099 |
*pfnptr = *pfnptr + 1;
|
| 1100 |
addr = pfn_to_paddr(*pfnptr, s->page_shift); |
| 1101 |
|
| 1102 |
if ((addr >= block->target_start) &&
|
| 1103 |
(addr + s->page_size <= block->target_end)) {
|
| 1104 |
buf = block->host_addr + (addr - block->target_start); |
| 1105 |
} else {
|
| 1106 |
/* the next page is in the next block */
|
| 1107 |
block = QTAILQ_NEXT(block, next); |
| 1108 |
*blockptr = block; |
| 1109 |
if (!block) {
|
| 1110 |
return false; |
| 1111 |
} |
| 1112 |
assert(block->target_start % s->page_size == 0);
|
| 1113 |
assert(block->target_end % s->page_size == 0);
|
| 1114 |
*pfnptr = paddr_to_pfn(block->target_start, s->page_shift); |
| 1115 |
buf = block->host_addr; |
| 1116 |
} |
| 1117 |
|
| 1118 |
if (bufptr) {
|
| 1119 |
*bufptr = buf; |
| 1120 |
} |
| 1121 |
|
| 1122 |
return true; |
| 1123 |
} |
| 1124 |
|
| 1125 |
static int write_dump_bitmap(DumpState *s) |
| 1126 |
{
|
| 1127 |
int ret = 0; |
| 1128 |
uint64_t last_pfn, pfn; |
| 1129 |
void *dump_bitmap_buf;
|
| 1130 |
size_t num_dumpable; |
| 1131 |
GuestPhysBlock *block_iter = NULL;
|
| 1132 |
|
| 1133 |
/* dump_bitmap_buf is used to store dump_bitmap temporarily */
|
| 1134 |
dump_bitmap_buf = g_malloc0(BUFSIZE_BITMAP); |
| 1135 |
|
| 1136 |
num_dumpable = 0;
|
| 1137 |
last_pfn = 0;
|
| 1138 |
|
| 1139 |
/*
|
| 1140 |
* exam memory page by page, and set the bit in dump_bitmap corresponded
|
| 1141 |
* to the existing page.
|
| 1142 |
*/
|
| 1143 |
while (get_next_page(&block_iter, &pfn, NULL, s)) { |
| 1144 |
ret = set_dump_bitmap(last_pfn, pfn, true, dump_bitmap_buf, s);
|
| 1145 |
if (ret < 0) { |
| 1146 |
dump_error(s, "dump: failed to set dump_bitmap.\n");
|
| 1147 |
ret = -1;
|
| 1148 |
goto out;
|
| 1149 |
} |
| 1150 |
|
| 1151 |
last_pfn = pfn; |
| 1152 |
num_dumpable++; |
| 1153 |
} |
| 1154 |
|
| 1155 |
/*
|
| 1156 |
* set_dump_bitmap will always leave the recently set bit un-sync. Here we
|
| 1157 |
* set last_pfn + PFN_BUFBITMAP to 0 and those set but un-sync bit will be
|
| 1158 |
* synchronized into vmcore.
|
| 1159 |
*/
|
| 1160 |
if (num_dumpable > 0) { |
| 1161 |
ret = set_dump_bitmap(last_pfn, last_pfn + PFN_BUFBITMAP, false,
|
| 1162 |
dump_bitmap_buf, s); |
| 1163 |
if (ret < 0) { |
| 1164 |
dump_error(s, "dump: failed to sync dump_bitmap.\n");
|
| 1165 |
ret = -1;
|
| 1166 |
goto out;
|
| 1167 |
} |
| 1168 |
} |
| 1169 |
|
| 1170 |
/* number of dumpable pages that will be dumped later */
|
| 1171 |
s->num_dumpable = num_dumpable; |
| 1172 |
|
| 1173 |
out:
|
| 1174 |
g_free(dump_bitmap_buf); |
| 1175 |
|
| 1176 |
return ret;
|
| 1177 |
} |
| 1178 |
|
| 1179 |
static void prepare_data_cache(DataCache *data_cache, DumpState *s, |
| 1180 |
off_t offset) |
| 1181 |
{
|
| 1182 |
data_cache->fd = s->fd; |
| 1183 |
data_cache->data_size = 0;
|
| 1184 |
data_cache->buf_size = BUFSIZE_DATA_CACHE; |
| 1185 |
data_cache->buf = g_malloc0(BUFSIZE_DATA_CACHE); |
| 1186 |
data_cache->offset = offset; |
| 1187 |
} |
| 1188 |
|
| 1189 |
static int write_cache(DataCache *dc, const void *buf, size_t size, |
| 1190 |
bool flag_sync)
|
| 1191 |
{
|
| 1192 |
/*
|
| 1193 |
* dc->buf_size should not be less than size, otherwise dc will never be
|
| 1194 |
* enough
|
| 1195 |
*/
|
| 1196 |
assert(size <= dc->buf_size); |
| 1197 |
|
| 1198 |
/*
|
| 1199 |
* if flag_sync is set, synchronize data in dc->buf into vmcore.
|
| 1200 |
* otherwise check if the space is enough for caching data in buf, if not,
|
| 1201 |
* write the data in dc->buf to dc->fd and reset dc->buf
|
| 1202 |
*/
|
| 1203 |
if ((!flag_sync && dc->data_size + size > dc->buf_size) ||
|
| 1204 |
(flag_sync && dc->data_size > 0)) {
|
| 1205 |
if (write_buffer(dc->fd, dc->offset, dc->buf, dc->data_size) < 0) { |
| 1206 |
return -1; |
| 1207 |
} |
| 1208 |
|
| 1209 |
dc->offset += dc->data_size; |
| 1210 |
dc->data_size = 0;
|
| 1211 |
} |
| 1212 |
|
| 1213 |
if (!flag_sync) {
|
| 1214 |
memcpy(dc->buf + dc->data_size, buf, size); |
| 1215 |
dc->data_size += size; |
| 1216 |
} |
| 1217 |
|
| 1218 |
return 0; |
| 1219 |
} |
| 1220 |
|
| 1221 |
static void free_data_cache(DataCache *data_cache) |
| 1222 |
{
|
| 1223 |
g_free(data_cache->buf); |
| 1224 |
} |
| 1225 |
|
| 1226 |
static size_t get_len_buf_out(size_t page_size, uint32_t flag_compress)
|
| 1227 |
{
|
| 1228 |
size_t len_buf_out_zlib, len_buf_out_lzo, len_buf_out_snappy; |
| 1229 |
size_t len_buf_out; |
| 1230 |
|
| 1231 |
/* init buf_out */
|
| 1232 |
len_buf_out_zlib = len_buf_out_lzo = len_buf_out_snappy = 0;
|
| 1233 |
|
| 1234 |
/* buf size for zlib */
|
| 1235 |
len_buf_out_zlib = compressBound(page_size); |
| 1236 |
|
| 1237 |
/* buf size for lzo */
|
| 1238 |
#ifdef CONFIG_LZO
|
| 1239 |
if (flag_compress & DUMP_DH_COMPRESSED_LZO) {
|
| 1240 |
if (lzo_init() != LZO_E_OK) {
|
| 1241 |
/* return 0 to indicate lzo is unavailable */
|
| 1242 |
return 0; |
| 1243 |
} |
| 1244 |
} |
| 1245 |
|
| 1246 |
/*
|
| 1247 |
* LZO will expand incompressible data by a little amount. please check the
|
| 1248 |
* following URL to see the expansion calculation:
|
| 1249 |
* http://www.oberhumer.com/opensource/lzo/lzofaq.php
|
| 1250 |
*/
|
| 1251 |
len_buf_out_lzo = page_size + page_size / 16 + 64 + 3; |
| 1252 |
#endif
|
| 1253 |
|
| 1254 |
#ifdef CONFIG_SNAPPY
|
| 1255 |
/* buf size for snappy */
|
| 1256 |
len_buf_out_snappy = snappy_max_compressed_length(page_size); |
| 1257 |
#endif
|
| 1258 |
|
| 1259 |
/* get the biggest that can store all kinds of compressed page */
|
| 1260 |
len_buf_out = MAX(len_buf_out_zlib, |
| 1261 |
MAX(len_buf_out_lzo, len_buf_out_snappy)); |
| 1262 |
|
| 1263 |
return len_buf_out;
|
| 1264 |
} |
| 1265 |
|
| 1266 |
/*
|
| 1267 |
* check if the page is all 0
|
| 1268 |
*/
|
| 1269 |
static inline bool is_zero_page(const uint8_t *buf, size_t page_size) |
| 1270 |
{
|
| 1271 |
return buffer_is_zero(buf, page_size);
|
| 1272 |
} |
| 1273 |
|
| 1274 |
static int write_dump_pages(DumpState *s) |
| 1275 |
{
|
| 1276 |
int ret = 0; |
| 1277 |
DataCache page_desc, page_data; |
| 1278 |
size_t len_buf_out, size_out; |
| 1279 |
#ifdef CONFIG_LZO
|
| 1280 |
lzo_bytep wrkmem = NULL;
|
| 1281 |
#endif
|
| 1282 |
uint8_t *buf_out = NULL;
|
| 1283 |
off_t offset_desc, offset_data; |
| 1284 |
PageDescriptor pd, pd_zero; |
| 1285 |
uint8_t *buf; |
| 1286 |
int endian = s->dump_info.d_endian;
|
| 1287 |
GuestPhysBlock *block_iter = NULL;
|
| 1288 |
uint64_t pfn_iter; |
| 1289 |
|
| 1290 |
/* get offset of page_desc and page_data in dump file */
|
| 1291 |
offset_desc = s->offset_page; |
| 1292 |
offset_data = offset_desc + sizeof(PageDescriptor) * s->num_dumpable;
|
| 1293 |
|
| 1294 |
prepare_data_cache(&page_desc, s, offset_desc); |
| 1295 |
prepare_data_cache(&page_data, s, offset_data); |
| 1296 |
|
| 1297 |
/* prepare buffer to store compressed data */
|
| 1298 |
len_buf_out = get_len_buf_out(s->page_size, s->flag_compress); |
| 1299 |
if (len_buf_out == 0) { |
| 1300 |
dump_error(s, "dump: failed to get length of output buffer.\n");
|
| 1301 |
goto out;
|
| 1302 |
} |
| 1303 |
|
| 1304 |
#ifdef CONFIG_LZO
|
| 1305 |
wrkmem = g_malloc(LZO1X_1_MEM_COMPRESS); |
| 1306 |
#endif
|
| 1307 |
|
| 1308 |
buf_out = g_malloc(len_buf_out); |
| 1309 |
|
| 1310 |
/*
|
| 1311 |
* init zero page's page_desc and page_data, because every zero page
|
| 1312 |
* uses the same page_data
|
| 1313 |
*/
|
| 1314 |
pd_zero.size = cpu_convert_to_target32(s->page_size, endian); |
| 1315 |
pd_zero.flags = cpu_convert_to_target32(0, endian);
|
| 1316 |
pd_zero.offset = cpu_convert_to_target64(offset_data, endian); |
| 1317 |
pd_zero.page_flags = cpu_convert_to_target64(0, endian);
|
| 1318 |
buf = g_malloc0(s->page_size); |
| 1319 |
ret = write_cache(&page_data, buf, s->page_size, false);
|
| 1320 |
g_free(buf); |
| 1321 |
if (ret < 0) { |
| 1322 |
dump_error(s, "dump: failed to write page data(zero page).\n");
|
| 1323 |
goto out;
|
| 1324 |
} |
| 1325 |
|
| 1326 |
offset_data += s->page_size; |
| 1327 |
|
| 1328 |
/*
|
| 1329 |
* dump memory to vmcore page by page. zero page will all be resided in the
|
| 1330 |
* first page of page section
|
| 1331 |
*/
|
| 1332 |
while (get_next_page(&block_iter, &pfn_iter, &buf, s)) {
|
| 1333 |
/* check zero page */
|
| 1334 |
if (is_zero_page(buf, s->page_size)) {
|
| 1335 |
ret = write_cache(&page_desc, &pd_zero, sizeof(PageDescriptor),
|
| 1336 |
false);
|
| 1337 |
if (ret < 0) { |
| 1338 |
dump_error(s, "dump: failed to write page desc.\n");
|
| 1339 |
goto out;
|
| 1340 |
} |
| 1341 |
} else {
|
| 1342 |
/*
|
| 1343 |
* not zero page, then:
|
| 1344 |
* 1. compress the page
|
| 1345 |
* 2. write the compressed page into the cache of page_data
|
| 1346 |
* 3. get page desc of the compressed page and write it into the
|
| 1347 |
* cache of page_desc
|
| 1348 |
*
|
| 1349 |
* only one compression format will be used here, for
|
| 1350 |
* s->flag_compress is set. But when compression fails to work,
|
| 1351 |
* we fall back to save in plaintext.
|
| 1352 |
*/
|
| 1353 |
size_out = len_buf_out; |
| 1354 |
if ((s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) &&
|
| 1355 |
(compress2(buf_out, (uLongf *)&size_out, buf, s->page_size, |
| 1356 |
Z_BEST_SPEED) == Z_OK) && (size_out < s->page_size)) {
|
| 1357 |
pd.flags = cpu_convert_to_target32(DUMP_DH_COMPRESSED_ZLIB, |
| 1358 |
endian); |
| 1359 |
pd.size = cpu_convert_to_target32(size_out, endian); |
| 1360 |
|
| 1361 |
ret = write_cache(&page_data, buf_out, size_out, false);
|
| 1362 |
if (ret < 0) { |
| 1363 |
dump_error(s, "dump: failed to write page data.\n");
|
| 1364 |
goto out;
|
| 1365 |
} |
| 1366 |
#ifdef CONFIG_LZO
|
| 1367 |
} else if ((s->flag_compress & DUMP_DH_COMPRESSED_LZO) && |
| 1368 |
(lzo1x_1_compress(buf, s->page_size, buf_out, |
| 1369 |
(lzo_uint *)&size_out, wrkmem) == LZO_E_OK) && |
| 1370 |
(size_out < s->page_size)) {
|
| 1371 |
pd.flags = cpu_convert_to_target32(DUMP_DH_COMPRESSED_LZO, |
| 1372 |
endian); |
| 1373 |
pd.size = cpu_convert_to_target32(size_out, endian); |
| 1374 |
|
| 1375 |
ret = write_cache(&page_data, buf_out, size_out, false);
|
| 1376 |
if (ret < 0) { |
| 1377 |
dump_error(s, "dump: failed to write page data.\n");
|
| 1378 |
goto out;
|
| 1379 |
} |
| 1380 |
#endif
|
| 1381 |
#ifdef CONFIG_SNAPPY
|
| 1382 |
} else if ((s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) && |
| 1383 |
(snappy_compress((char *)buf, s->page_size,
|
| 1384 |
(char *)buf_out, &size_out) == SNAPPY_OK) &&
|
| 1385 |
(size_out < s->page_size)) {
|
| 1386 |
pd.flags = cpu_convert_to_target32( |
| 1387 |
DUMP_DH_COMPRESSED_SNAPPY, endian); |
| 1388 |
pd.size = cpu_convert_to_target32(size_out, endian); |
| 1389 |
|
| 1390 |
ret = write_cache(&page_data, buf_out, size_out, false);
|
| 1391 |
if (ret < 0) { |
| 1392 |
dump_error(s, "dump: failed to write page data.\n");
|
| 1393 |
goto out;
|
| 1394 |
} |
| 1395 |
#endif
|
| 1396 |
} else {
|
| 1397 |
/*
|
| 1398 |
* fall back to save in plaintext, size_out should be
|
| 1399 |
* assigned to s->page_size
|
| 1400 |
*/
|
| 1401 |
pd.flags = cpu_convert_to_target32(0, endian);
|
| 1402 |
size_out = s->page_size; |
| 1403 |
pd.size = cpu_convert_to_target32(size_out, endian); |
| 1404 |
|
| 1405 |
ret = write_cache(&page_data, buf, s->page_size, false);
|
| 1406 |
if (ret < 0) { |
| 1407 |
dump_error(s, "dump: failed to write page data.\n");
|
| 1408 |
goto out;
|
| 1409 |
} |
| 1410 |
} |
| 1411 |
|
| 1412 |
/* get and write page desc here */
|
| 1413 |
pd.page_flags = cpu_convert_to_target64(0, endian);
|
| 1414 |
pd.offset = cpu_convert_to_target64(offset_data, endian); |
| 1415 |
offset_data += size_out; |
| 1416 |
|
| 1417 |
ret = write_cache(&page_desc, &pd, sizeof(PageDescriptor), false); |
| 1418 |
if (ret < 0) { |
| 1419 |
dump_error(s, "dump: failed to write page desc.\n");
|
| 1420 |
goto out;
|
| 1421 |
} |
| 1422 |
} |
| 1423 |
} |
| 1424 |
|
| 1425 |
ret = write_cache(&page_desc, NULL, 0, true); |
| 1426 |
if (ret < 0) { |
| 1427 |
dump_error(s, "dump: failed to sync cache for page_desc.\n");
|
| 1428 |
goto out;
|
| 1429 |
} |
| 1430 |
ret = write_cache(&page_data, NULL, 0, true); |
| 1431 |
if (ret < 0) { |
| 1432 |
dump_error(s, "dump: failed to sync cache for page_data.\n");
|
| 1433 |
goto out;
|
| 1434 |
} |
| 1435 |
|
| 1436 |
out:
|
| 1437 |
free_data_cache(&page_desc); |
| 1438 |
free_data_cache(&page_data); |
| 1439 |
|
| 1440 |
#ifdef CONFIG_LZO
|
| 1441 |
g_free(wrkmem); |
| 1442 |
#endif
|
| 1443 |
|
| 1444 |
g_free(buf_out); |
| 1445 |
|
| 1446 |
return ret;
|
| 1447 |
} |
| 1448 |
|
| 1449 |
static int create_kdump_vmcore(DumpState *s) |
| 1450 |
{
|
| 1451 |
int ret;
|
| 1452 |
|
| 1453 |
/*
|
| 1454 |
* the kdump-compressed format is:
|
| 1455 |
* File offset
|
| 1456 |
* +------------------------------------------+ 0x0
|
| 1457 |
* | main header (struct disk_dump_header) |
|
| 1458 |
* |------------------------------------------+ block 1
|
| 1459 |
* | sub header (struct kdump_sub_header) |
|
| 1460 |
* |------------------------------------------+ block 2
|
| 1461 |
* | 1st-dump_bitmap |
|
| 1462 |
* |------------------------------------------+ block 2 + X blocks
|
| 1463 |
* | 2nd-dump_bitmap | (aligned by block)
|
| 1464 |
* |------------------------------------------+ block 2 + 2 * X blocks
|
| 1465 |
* | page desc for pfn 0 (struct page_desc) | (aligned by block)
|
| 1466 |
* | page desc for pfn 1 (struct page_desc) |
|
| 1467 |
* | : |
|
| 1468 |
* |------------------------------------------| (not aligned by block)
|
| 1469 |
* | page data (pfn 0) |
|
| 1470 |
* | page data (pfn 1) |
|
| 1471 |
* | : |
|
| 1472 |
* +------------------------------------------+
|
| 1473 |
*/
|
| 1474 |
|
| 1475 |
ret = write_start_flat_header(s->fd); |
| 1476 |
if (ret < 0) { |
| 1477 |
dump_error(s, "dump: failed to write start flat header.\n");
|
| 1478 |
return -1; |
| 1479 |
} |
| 1480 |
|
| 1481 |
ret = write_dump_header(s); |
| 1482 |
if (ret < 0) { |
| 1483 |
return -1; |
| 1484 |
} |
| 1485 |
|
| 1486 |
ret = write_dump_bitmap(s); |
| 1487 |
if (ret < 0) { |
| 1488 |
return -1; |
| 1489 |
} |
| 1490 |
|
| 1491 |
ret = write_dump_pages(s); |
| 1492 |
if (ret < 0) { |
| 1493 |
return -1; |
| 1494 |
} |
| 1495 |
|
| 1496 |
ret = write_end_flat_header(s->fd); |
| 1497 |
if (ret < 0) { |
| 1498 |
dump_error(s, "dump: failed to write end flat header.\n");
|
| 1499 |
return -1; |
| 1500 |
} |
| 1501 |
|
| 1502 |
dump_completed(s); |
| 1503 |
|
| 1504 |
return 0; |
| 1505 |
} |
| 1506 |
|
| 1507 |
static ram_addr_t get_start_block(DumpState *s)
|
| 1508 |
{
|
| 1509 |
GuestPhysBlock *block; |
| 1510 |
|
| 1511 |
if (!s->has_filter) {
|
| 1512 |
s->next_block = QTAILQ_FIRST(&s->guest_phys_blocks.head); |
| 1513 |
return 0; |
| 1514 |
} |
| 1515 |
|
| 1516 |
QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) {
|
| 1517 |
if (block->target_start >= s->begin + s->length ||
|
| 1518 |
block->target_end <= s->begin) {
|
| 1519 |
/* This block is out of the range */
|
| 1520 |
continue;
|
| 1521 |
} |
| 1522 |
|
| 1523 |
s->next_block = block; |
| 1524 |
if (s->begin > block->target_start) {
|
| 1525 |
s->start = s->begin - block->target_start; |
| 1526 |
} else {
|
| 1527 |
s->start = 0;
|
| 1528 |
} |
| 1529 |
return s->start;
|
| 1530 |
} |
| 1531 |
|
| 1532 |
return -1; |
| 1533 |
} |
| 1534 |
|
| 1535 |
static void get_max_mapnr(DumpState *s) |
| 1536 |
{
|
| 1537 |
GuestPhysBlock *last_block; |
| 1538 |
|
| 1539 |
last_block = QTAILQ_LAST(&s->guest_phys_blocks.head, GuestPhysBlockHead); |
| 1540 |
s->max_mapnr = paddr_to_pfn(last_block->target_end, s->page_shift); |
| 1541 |
} |
| 1542 |
|
| 1543 |
static int dump_init(DumpState *s, int fd, bool has_format, |
| 1544 |
DumpGuestMemoryFormat format, bool paging, bool has_filter, |
| 1545 |
int64_t begin, int64_t length, Error **errp) |
| 1546 |
{
|
| 1547 |
CPUState *cpu; |
| 1548 |
int nr_cpus;
|
| 1549 |
Error *err = NULL;
|
| 1550 |
int ret;
|
| 1551 |
|
| 1552 |
/* kdump-compressed is conflict with paging and filter */
|
| 1553 |
if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) {
|
| 1554 |
assert(!paging && !has_filter); |
| 1555 |
} |
| 1556 |
|
| 1557 |
if (runstate_is_running()) {
|
| 1558 |
vm_stop(RUN_STATE_SAVE_VM); |
| 1559 |
s->resume = true;
|
| 1560 |
} else {
|
| 1561 |
s->resume = false;
|
| 1562 |
} |
| 1563 |
|
| 1564 |
/* If we use KVM, we should synchronize the registers before we get dump
|
| 1565 |
* info or physmap info.
|
| 1566 |
*/
|
| 1567 |
cpu_synchronize_all_states(); |
| 1568 |
nr_cpus = 0;
|
| 1569 |
CPU_FOREACH(cpu) {
|
| 1570 |
nr_cpus++; |
| 1571 |
} |
| 1572 |
|
| 1573 |
s->errp = errp; |
| 1574 |
s->fd = fd; |
| 1575 |
s->has_filter = has_filter; |
| 1576 |
s->begin = begin; |
| 1577 |
s->length = length; |
| 1578 |
|
| 1579 |
guest_phys_blocks_init(&s->guest_phys_blocks); |
| 1580 |
guest_phys_blocks_append(&s->guest_phys_blocks); |
| 1581 |
|
| 1582 |
s->start = get_start_block(s); |
| 1583 |
if (s->start == -1) { |
| 1584 |
error_set(errp, QERR_INVALID_PARAMETER, "begin");
|
| 1585 |
goto cleanup;
|
| 1586 |
} |
| 1587 |
|
| 1588 |
/* get dump info: endian, class and architecture.
|
| 1589 |
* If the target architecture is not supported, cpu_get_dump_info() will
|
| 1590 |
* return -1.
|
| 1591 |
*/
|
| 1592 |
ret = cpu_get_dump_info(&s->dump_info, &s->guest_phys_blocks); |
| 1593 |
if (ret < 0) { |
| 1594 |
error_set(errp, QERR_UNSUPPORTED); |
| 1595 |
goto cleanup;
|
| 1596 |
} |
| 1597 |
|
| 1598 |
s->note_size = cpu_get_note_size(s->dump_info.d_class, |
| 1599 |
s->dump_info.d_machine, nr_cpus); |
| 1600 |
if (s->note_size < 0) { |
| 1601 |
error_set(errp, QERR_UNSUPPORTED); |
| 1602 |
goto cleanup;
|
| 1603 |
} |
| 1604 |
|
| 1605 |
/* get memory mapping */
|
| 1606 |
memory_mapping_list_init(&s->list); |
| 1607 |
if (paging) {
|
| 1608 |
qemu_get_guest_memory_mapping(&s->list, &s->guest_phys_blocks, &err); |
| 1609 |
if (err != NULL) { |
| 1610 |
error_propagate(errp, err); |
| 1611 |
goto cleanup;
|
| 1612 |
} |
| 1613 |
} else {
|
| 1614 |
qemu_get_guest_simple_memory_mapping(&s->list, &s->guest_phys_blocks); |
| 1615 |
} |
| 1616 |
|
| 1617 |
s->nr_cpus = nr_cpus; |
| 1618 |
s->page_size = TARGET_PAGE_SIZE; |
| 1619 |
s->page_shift = ffs(s->page_size) - 1;
|
| 1620 |
|
| 1621 |
get_max_mapnr(s); |
| 1622 |
|
| 1623 |
uint64_t tmp; |
| 1624 |
tmp = DIV_ROUND_UP(DIV_ROUND_UP(s->max_mapnr, CHAR_BIT), s->page_size); |
| 1625 |
s->len_dump_bitmap = tmp * s->page_size; |
| 1626 |
|
| 1627 |
/* init for kdump-compressed format */
|
| 1628 |
if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) {
|
| 1629 |
switch (format) {
|
| 1630 |
case DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB:
|
| 1631 |
s->flag_compress = DUMP_DH_COMPRESSED_ZLIB; |
| 1632 |
break;
|
| 1633 |
|
| 1634 |
case DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO:
|
| 1635 |
s->flag_compress = DUMP_DH_COMPRESSED_LZO; |
| 1636 |
break;
|
| 1637 |
|
| 1638 |
case DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY:
|
| 1639 |
s->flag_compress = DUMP_DH_COMPRESSED_SNAPPY; |
| 1640 |
break;
|
| 1641 |
|
| 1642 |
default:
|
| 1643 |
s->flag_compress = 0;
|
| 1644 |
} |
| 1645 |
|
| 1646 |
return 0; |
| 1647 |
} |
| 1648 |
|
| 1649 |
if (s->has_filter) {
|
| 1650 |
memory_mapping_filter(&s->list, s->begin, s->length); |
| 1651 |
} |
| 1652 |
|
| 1653 |
/*
|
| 1654 |
* calculate phdr_num
|
| 1655 |
*
|
| 1656 |
* the type of ehdr->e_phnum is uint16_t, so we should avoid overflow
|
| 1657 |
*/
|
| 1658 |
s->phdr_num = 1; /* PT_NOTE */ |
| 1659 |
if (s->list.num < UINT16_MAX - 2) { |
| 1660 |
s->phdr_num += s->list.num; |
| 1661 |
s->have_section = false;
|
| 1662 |
} else {
|
| 1663 |
s->have_section = true;
|
| 1664 |
s->phdr_num = PN_XNUM; |
| 1665 |
s->sh_info = 1; /* PT_NOTE */ |
| 1666 |
|
| 1667 |
/* the type of shdr->sh_info is uint32_t, so we should avoid overflow */
|
| 1668 |
if (s->list.num <= UINT32_MAX - 1) { |
| 1669 |
s->sh_info += s->list.num; |
| 1670 |
} else {
|
| 1671 |
s->sh_info = UINT32_MAX; |
| 1672 |
} |
| 1673 |
} |
| 1674 |
|
| 1675 |
if (s->dump_info.d_class == ELFCLASS64) {
|
| 1676 |
if (s->have_section) {
|
| 1677 |
s->memory_offset = sizeof(Elf64_Ehdr) +
|
| 1678 |
sizeof(Elf64_Phdr) * s->sh_info +
|
| 1679 |
sizeof(Elf64_Shdr) + s->note_size;
|
| 1680 |
} else {
|
| 1681 |
s->memory_offset = sizeof(Elf64_Ehdr) +
|
| 1682 |
sizeof(Elf64_Phdr) * s->phdr_num + s->note_size;
|
| 1683 |
} |
| 1684 |
} else {
|
| 1685 |
if (s->have_section) {
|
| 1686 |
s->memory_offset = sizeof(Elf32_Ehdr) +
|
| 1687 |
sizeof(Elf32_Phdr) * s->sh_info +
|
| 1688 |
sizeof(Elf32_Shdr) + s->note_size;
|
| 1689 |
} else {
|
| 1690 |
s->memory_offset = sizeof(Elf32_Ehdr) +
|
| 1691 |
sizeof(Elf32_Phdr) * s->phdr_num + s->note_size;
|
| 1692 |
} |
| 1693 |
} |
| 1694 |
|
| 1695 |
return 0; |
| 1696 |
|
| 1697 |
cleanup:
|
| 1698 |
guest_phys_blocks_free(&s->guest_phys_blocks); |
| 1699 |
|
| 1700 |
if (s->resume) {
|
| 1701 |
vm_start(); |
| 1702 |
} |
| 1703 |
|
| 1704 |
return -1; |
| 1705 |
} |
| 1706 |
|
| 1707 |
void qmp_dump_guest_memory(bool paging, const char *file, bool has_begin, |
| 1708 |
int64_t begin, bool has_length,
|
| 1709 |
int64_t length, bool has_format,
|
| 1710 |
DumpGuestMemoryFormat format, Error **errp) |
| 1711 |
{
|
| 1712 |
const char *p; |
| 1713 |
int fd = -1; |
| 1714 |
DumpState *s; |
| 1715 |
int ret;
|
| 1716 |
|
| 1717 |
/*
|
| 1718 |
* kdump-compressed format need the whole memory dumped, so paging or
|
| 1719 |
* filter is not supported here.
|
| 1720 |
*/
|
| 1721 |
if ((has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) &&
|
| 1722 |
(paging || has_begin || has_length)) {
|
| 1723 |
error_setg(errp, "kdump-compressed format doesn't support paging or "
|
| 1724 |
"filter");
|
| 1725 |
return;
|
| 1726 |
} |
| 1727 |
if (has_begin && !has_length) {
|
| 1728 |
error_set(errp, QERR_MISSING_PARAMETER, "length");
|
| 1729 |
return;
|
| 1730 |
} |
| 1731 |
if (!has_begin && has_length) {
|
| 1732 |
error_set(errp, QERR_MISSING_PARAMETER, "begin");
|
| 1733 |
return;
|
| 1734 |
} |
| 1735 |
|
| 1736 |
/* check whether lzo/snappy is supported */
|
| 1737 |
#ifndef CONFIG_LZO
|
| 1738 |
if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO) {
|
| 1739 |
error_setg(errp, "kdump-lzo is not available now");
|
| 1740 |
return;
|
| 1741 |
} |
| 1742 |
#endif
|
| 1743 |
|
| 1744 |
#ifndef CONFIG_SNAPPY
|
| 1745 |
if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY) {
|
| 1746 |
error_setg(errp, "kdump-snappy is not available now");
|
| 1747 |
return;
|
| 1748 |
} |
| 1749 |
#endif
|
| 1750 |
|
| 1751 |
#if !defined(WIN32)
|
| 1752 |
if (strstart(file, "fd:", &p)) { |
| 1753 |
fd = monitor_get_fd(cur_mon, p, errp); |
| 1754 |
if (fd == -1) { |
| 1755 |
return;
|
| 1756 |
} |
| 1757 |
} |
| 1758 |
#endif
|
| 1759 |
|
| 1760 |
if (strstart(file, "file:", &p)) { |
| 1761 |
fd = qemu_open(p, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRUSR); |
| 1762 |
if (fd < 0) { |
| 1763 |
error_setg_file_open(errp, errno, p); |
| 1764 |
return;
|
| 1765 |
} |
| 1766 |
} |
| 1767 |
|
| 1768 |
if (fd == -1) { |
| 1769 |
error_set(errp, QERR_INVALID_PARAMETER, "protocol");
|
| 1770 |
return;
|
| 1771 |
} |
| 1772 |
|
| 1773 |
s = g_malloc0(sizeof(DumpState));
|
| 1774 |
|
| 1775 |
ret = dump_init(s, fd, has_format, format, paging, has_begin, |
| 1776 |
begin, length, errp); |
| 1777 |
if (ret < 0) { |
| 1778 |
g_free(s); |
| 1779 |
return;
|
| 1780 |
} |
| 1781 |
|
| 1782 |
if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) {
|
| 1783 |
if (create_kdump_vmcore(s) < 0 && !error_is_set(s->errp)) { |
| 1784 |
error_set(errp, QERR_IO_ERROR); |
| 1785 |
} |
| 1786 |
} else {
|
| 1787 |
if (create_vmcore(s) < 0 && !error_is_set(s->errp)) { |
| 1788 |
error_set(errp, QERR_IO_ERROR); |
| 1789 |
} |
| 1790 |
} |
| 1791 |
|
| 1792 |
g_free(s); |
| 1793 |
} |
| 1794 |
|
| 1795 |
DumpGuestMemoryCapability *qmp_query_dump_guest_memory_capability(Error **errp) |
| 1796 |
{
|
| 1797 |
DumpGuestMemoryFormatList *item; |
| 1798 |
DumpGuestMemoryCapability *cap = |
| 1799 |
g_malloc0(sizeof(DumpGuestMemoryCapability));
|
| 1800 |
|
| 1801 |
/* elf is always available */
|
| 1802 |
item = g_malloc0(sizeof(DumpGuestMemoryFormatList));
|
| 1803 |
cap->formats = item; |
| 1804 |
item->value = DUMP_GUEST_MEMORY_FORMAT_ELF; |
| 1805 |
|
| 1806 |
/* kdump-zlib is always available */
|
| 1807 |
item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList));
|
| 1808 |
item = item->next; |
| 1809 |
item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB; |
| 1810 |
|
| 1811 |
/* add new item if kdump-lzo is available */
|
| 1812 |
#ifdef CONFIG_LZO
|
| 1813 |
item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList));
|
| 1814 |
item = item->next; |
| 1815 |
item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO; |
| 1816 |
#endif
|
| 1817 |
|
| 1818 |
/* add new item if kdump-snappy is available */
|
| 1819 |
#ifdef CONFIG_SNAPPY
|
| 1820 |
item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList));
|
| 1821 |
item = item->next; |
| 1822 |
item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY; |
| 1823 |
#endif
|
| 1824 |
|
| 1825 |
return cap;
|
| 1826 |
} |