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https://gitlab.com/qemu-project/qemu
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298f116827
the functions are used to write header of kdump-compressed format to vmcore. Header of kdump-compressed format includes: 1. common header: DiskDumpHeader32 / DiskDumpHeader64 2. sub header: KdumpSubHeader32 / KdumpSubHeader64 3. extra information: only elf notes here Signed-off-by: Qiao Nuohan <qiaonuohan@cn.fujitsu.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
1229 lines
33 KiB
C
1229 lines
33 KiB
C
/*
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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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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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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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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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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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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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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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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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return 0;
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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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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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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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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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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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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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CPU_FOREACH(cpu) {
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id = cpu_index(cpu);
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ret = cpu_write_elf32_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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CPU_FOREACH(cpu) {
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ret = cpu_write_elf32_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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static int write_elf_section(DumpState *s, int type)
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{
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Elf32_Shdr shdr32;
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Elf64_Shdr shdr64;
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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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if (type == 0) {
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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);
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shdr = &shdr32;
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} else {
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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);
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shdr = &shdr64;
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}
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ret = fd_write_vmcore(&shdr, shdr_size, s);
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if (ret < 0) {
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dump_error(s, "dump: failed to write section 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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static int write_data(DumpState *s, void *buf, int length)
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{
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int ret;
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ret = fd_write_vmcore(buf, length, s);
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if (ret < 0) {
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dump_error(s, "dump: failed to save memory.\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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/* write the memroy to vmcore. 1 page per I/O. */
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static int write_memory(DumpState *s, GuestPhysBlock *block, ram_addr_t start,
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int64_t size)
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{
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int64_t i;
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int ret;
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for (i = 0; i < size / TARGET_PAGE_SIZE; i++) {
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ret = write_data(s, block->host_addr + start + i * TARGET_PAGE_SIZE,
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TARGET_PAGE_SIZE);
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if (ret < 0) {
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return ret;
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}
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}
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if ((size % TARGET_PAGE_SIZE) != 0) {
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ret = write_data(s, block->host_addr + start + i * TARGET_PAGE_SIZE,
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size % TARGET_PAGE_SIZE);
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if (ret < 0) {
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return ret;
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}
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}
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return 0;
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}
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/* get the memory's offset and size in the vmcore */
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static void get_offset_range(hwaddr phys_addr,
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ram_addr_t mapping_length,
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DumpState *s,
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hwaddr *p_offset,
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hwaddr *p_filesz)
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{
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GuestPhysBlock *block;
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hwaddr offset = s->memory_offset;
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int64_t size_in_block, start;
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/* When the memory is not stored into vmcore, offset will be -1 */
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*p_offset = -1;
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*p_filesz = 0;
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if (s->has_filter) {
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if (phys_addr < s->begin || phys_addr >= s->begin + s->length) {
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return;
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}
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}
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QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) {
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if (s->has_filter) {
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if (block->target_start >= s->begin + s->length ||
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block->target_end <= s->begin) {
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/* This block is out of the range */
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continue;
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}
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if (s->begin <= block->target_start) {
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start = block->target_start;
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} else {
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start = s->begin;
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}
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size_in_block = block->target_end - start;
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if (s->begin + s->length < block->target_end) {
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size_in_block -= block->target_end - (s->begin + s->length);
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}
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} else {
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start = block->target_start;
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size_in_block = block->target_end - block->target_start;
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}
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if (phys_addr >= start && phys_addr < start + size_in_block) {
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*p_offset = phys_addr - start + offset;
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/* The offset range mapped from the vmcore file must not spill over
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* the GuestPhysBlock, clamp it. The rest of the mapping will be
|
|
* zero-filled in memory at load time; see
|
|
* <http://refspecs.linuxbase.org/elf/gabi4+/ch5.pheader.html>.
|
|
*/
|
|
*p_filesz = phys_addr + mapping_length <= start + size_in_block ?
|
|
mapping_length :
|
|
size_in_block - (phys_addr - start);
|
|
return;
|
|
}
|
|
|
|
offset += size_in_block;
|
|
}
|
|
}
|
|
|
|
static int write_elf_loads(DumpState *s)
|
|
{
|
|
hwaddr offset, filesz;
|
|
MemoryMapping *memory_mapping;
|
|
uint32_t phdr_index = 1;
|
|
int ret;
|
|
uint32_t max_index;
|
|
|
|
if (s->have_section) {
|
|
max_index = s->sh_info;
|
|
} else {
|
|
max_index = s->phdr_num;
|
|
}
|
|
|
|
QTAILQ_FOREACH(memory_mapping, &s->list.head, next) {
|
|
get_offset_range(memory_mapping->phys_addr,
|
|
memory_mapping->length,
|
|
s, &offset, &filesz);
|
|
if (s->dump_info.d_class == ELFCLASS64) {
|
|
ret = write_elf64_load(s, memory_mapping, phdr_index++, offset,
|
|
filesz);
|
|
} else {
|
|
ret = write_elf32_load(s, memory_mapping, phdr_index++, offset,
|
|
filesz);
|
|
}
|
|
|
|
if (ret < 0) {
|
|
return -1;
|
|
}
|
|
|
|
if (phdr_index >= max_index) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* write elf header, PT_NOTE and elf note to vmcore. */
|
|
static int dump_begin(DumpState *s)
|
|
{
|
|
int ret;
|
|
|
|
/*
|
|
* the vmcore's format is:
|
|
* --------------
|
|
* | elf header |
|
|
* --------------
|
|
* | PT_NOTE |
|
|
* --------------
|
|
* | PT_LOAD |
|
|
* --------------
|
|
* | ...... |
|
|
* --------------
|
|
* | PT_LOAD |
|
|
* --------------
|
|
* | sec_hdr |
|
|
* --------------
|
|
* | elf note |
|
|
* --------------
|
|
* | memory |
|
|
* --------------
|
|
*
|
|
* we only know where the memory is saved after we write elf note into
|
|
* vmcore.
|
|
*/
|
|
|
|
/* write elf header to vmcore */
|
|
if (s->dump_info.d_class == ELFCLASS64) {
|
|
ret = write_elf64_header(s);
|
|
} else {
|
|
ret = write_elf32_header(s);
|
|
}
|
|
if (ret < 0) {
|
|
return -1;
|
|
}
|
|
|
|
if (s->dump_info.d_class == ELFCLASS64) {
|
|
/* write PT_NOTE to vmcore */
|
|
if (write_elf64_note(s) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
/* write all PT_LOAD to vmcore */
|
|
if (write_elf_loads(s) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
/* write section to vmcore */
|
|
if (s->have_section) {
|
|
if (write_elf_section(s, 1) < 0) {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/* write notes to vmcore */
|
|
if (write_elf64_notes(fd_write_vmcore, s) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
} else {
|
|
/* write PT_NOTE to vmcore */
|
|
if (write_elf32_note(s) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
/* write all PT_LOAD to vmcore */
|
|
if (write_elf_loads(s) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
/* write section to vmcore */
|
|
if (s->have_section) {
|
|
if (write_elf_section(s, 0) < 0) {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/* write notes to vmcore */
|
|
if (write_elf32_notes(fd_write_vmcore, s) < 0) {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* write PT_LOAD to vmcore */
|
|
static int dump_completed(DumpState *s)
|
|
{
|
|
dump_cleanup(s);
|
|
return 0;
|
|
}
|
|
|
|
static int get_next_block(DumpState *s, GuestPhysBlock *block)
|
|
{
|
|
while (1) {
|
|
block = QTAILQ_NEXT(block, next);
|
|
if (!block) {
|
|
/* no more block */
|
|
return 1;
|
|
}
|
|
|
|
s->start = 0;
|
|
s->next_block = block;
|
|
if (s->has_filter) {
|
|
if (block->target_start >= s->begin + s->length ||
|
|
block->target_end <= s->begin) {
|
|
/* This block is out of the range */
|
|
continue;
|
|
}
|
|
|
|
if (s->begin > block->target_start) {
|
|
s->start = s->begin - block->target_start;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* write all memory to vmcore */
|
|
static int dump_iterate(DumpState *s)
|
|
{
|
|
GuestPhysBlock *block;
|
|
int64_t size;
|
|
int ret;
|
|
|
|
while (1) {
|
|
block = s->next_block;
|
|
|
|
size = block->target_end - block->target_start;
|
|
if (s->has_filter) {
|
|
size -= s->start;
|
|
if (s->begin + s->length < block->target_end) {
|
|
size -= block->target_end - (s->begin + s->length);
|
|
}
|
|
}
|
|
ret = write_memory(s, block, s->start, size);
|
|
if (ret == -1) {
|
|
return ret;
|
|
}
|
|
|
|
ret = get_next_block(s, block);
|
|
if (ret == 1) {
|
|
dump_completed(s);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int create_vmcore(DumpState *s)
|
|
{
|
|
int ret;
|
|
|
|
ret = dump_begin(s);
|
|
if (ret < 0) {
|
|
return -1;
|
|
}
|
|
|
|
ret = dump_iterate(s);
|
|
if (ret < 0) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int write_start_flat_header(int fd)
|
|
{
|
|
uint8_t *buf;
|
|
MakedumpfileHeader mh;
|
|
int ret = 0;
|
|
|
|
memset(&mh, 0, sizeof(mh));
|
|
strncpy(mh.signature, MAKEDUMPFILE_SIGNATURE,
|
|
strlen(MAKEDUMPFILE_SIGNATURE));
|
|
|
|
mh.type = cpu_to_be64(TYPE_FLAT_HEADER);
|
|
mh.version = cpu_to_be64(VERSION_FLAT_HEADER);
|
|
|
|
buf = g_malloc0(MAX_SIZE_MDF_HEADER);
|
|
memcpy(buf, &mh, sizeof(mh));
|
|
|
|
size_t written_size;
|
|
written_size = qemu_write_full(fd, buf, MAX_SIZE_MDF_HEADER);
|
|
if (written_size != MAX_SIZE_MDF_HEADER) {
|
|
ret = -1;
|
|
}
|
|
|
|
g_free(buf);
|
|
return ret;
|
|
}
|
|
|
|
static int write_end_flat_header(int fd)
|
|
{
|
|
MakedumpfileDataHeader mdh;
|
|
|
|
mdh.offset = END_FLAG_FLAT_HEADER;
|
|
mdh.buf_size = END_FLAG_FLAT_HEADER;
|
|
|
|
size_t written_size;
|
|
written_size = qemu_write_full(fd, &mdh, sizeof(mdh));
|
|
if (written_size != sizeof(mdh)) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int write_buffer(int fd, off_t offset, const void *buf, size_t size)
|
|
{
|
|
size_t written_size;
|
|
MakedumpfileDataHeader mdh;
|
|
|
|
mdh.offset = cpu_to_be64(offset);
|
|
mdh.buf_size = cpu_to_be64(size);
|
|
|
|
written_size = qemu_write_full(fd, &mdh, sizeof(mdh));
|
|
if (written_size != sizeof(mdh)) {
|
|
return -1;
|
|
}
|
|
|
|
written_size = qemu_write_full(fd, buf, size);
|
|
if (written_size != size) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int buf_write_note(const void *buf, size_t size, void *opaque)
|
|
{
|
|
DumpState *s = opaque;
|
|
|
|
/* note_buf is not enough */
|
|
if (s->note_buf_offset + size > s->note_size) {
|
|
return -1;
|
|
}
|
|
|
|
memcpy(s->note_buf + s->note_buf_offset, buf, size);
|
|
|
|
s->note_buf_offset += size;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* write common header, sub header and elf note to vmcore */
|
|
static int create_header32(DumpState *s)
|
|
{
|
|
int ret = 0;
|
|
DiskDumpHeader32 *dh = NULL;
|
|
KdumpSubHeader32 *kh = NULL;
|
|
size_t size;
|
|
int endian = s->dump_info.d_endian;
|
|
uint32_t block_size;
|
|
uint32_t sub_hdr_size;
|
|
uint32_t bitmap_blocks;
|
|
uint32_t status = 0;
|
|
uint64_t offset_note;
|
|
|
|
/* write common header, the version of kdump-compressed format is 6th */
|
|
size = sizeof(DiskDumpHeader32);
|
|
dh = g_malloc0(size);
|
|
|
|
strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE));
|
|
dh->header_version = cpu_convert_to_target32(6, endian);
|
|
block_size = s->page_size;
|
|
dh->block_size = cpu_convert_to_target32(block_size, endian);
|
|
sub_hdr_size = sizeof(struct KdumpSubHeader32) + s->note_size;
|
|
sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size);
|
|
dh->sub_hdr_size = cpu_convert_to_target32(sub_hdr_size, endian);
|
|
/* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */
|
|
dh->max_mapnr = cpu_convert_to_target32(MIN(s->max_mapnr, UINT_MAX),
|
|
endian);
|
|
dh->nr_cpus = cpu_convert_to_target32(s->nr_cpus, endian);
|
|
bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2;
|
|
dh->bitmap_blocks = cpu_convert_to_target32(bitmap_blocks, endian);
|
|
memcpy(&(dh->utsname.machine), "i686", 4);
|
|
|
|
if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) {
|
|
status |= DUMP_DH_COMPRESSED_ZLIB;
|
|
}
|
|
#ifdef CONFIG_LZO
|
|
if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) {
|
|
status |= DUMP_DH_COMPRESSED_LZO;
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_SNAPPY
|
|
if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) {
|
|
status |= DUMP_DH_COMPRESSED_SNAPPY;
|
|
}
|
|
#endif
|
|
dh->status = cpu_convert_to_target32(status, endian);
|
|
|
|
if (write_buffer(s->fd, 0, dh, size) < 0) {
|
|
dump_error(s, "dump: failed to write disk dump header.\n");
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
/* write sub header */
|
|
size = sizeof(KdumpSubHeader32);
|
|
kh = g_malloc0(size);
|
|
|
|
/* 64bit max_mapnr_64 */
|
|
kh->max_mapnr_64 = cpu_convert_to_target64(s->max_mapnr, endian);
|
|
kh->phys_base = cpu_convert_to_target32(PHYS_BASE, endian);
|
|
kh->dump_level = cpu_convert_to_target32(DUMP_LEVEL, endian);
|
|
|
|
offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size;
|
|
kh->offset_note = cpu_convert_to_target64(offset_note, endian);
|
|
kh->note_size = cpu_convert_to_target32(s->note_size, endian);
|
|
|
|
if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS *
|
|
block_size, kh, size) < 0) {
|
|
dump_error(s, "dump: failed to write kdump sub header.\n");
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
/* write note */
|
|
s->note_buf = g_malloc0(s->note_size);
|
|
s->note_buf_offset = 0;
|
|
|
|
/* use s->note_buf to store notes temporarily */
|
|
if (write_elf32_notes(buf_write_note, s) < 0) {
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
if (write_buffer(s->fd, offset_note, s->note_buf,
|
|
s->note_size) < 0) {
|
|
dump_error(s, "dump: failed to write notes");
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
/* get offset of dump_bitmap */
|
|
s->offset_dump_bitmap = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size) *
|
|
block_size;
|
|
|
|
/* get offset of page */
|
|
s->offset_page = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size + bitmap_blocks) *
|
|
block_size;
|
|
|
|
out:
|
|
g_free(dh);
|
|
g_free(kh);
|
|
g_free(s->note_buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* write common header, sub header and elf note to vmcore */
|
|
static int create_header64(DumpState *s)
|
|
{
|
|
int ret = 0;
|
|
DiskDumpHeader64 *dh = NULL;
|
|
KdumpSubHeader64 *kh = NULL;
|
|
size_t size;
|
|
int endian = s->dump_info.d_endian;
|
|
uint32_t block_size;
|
|
uint32_t sub_hdr_size;
|
|
uint32_t bitmap_blocks;
|
|
uint32_t status = 0;
|
|
uint64_t offset_note;
|
|
|
|
/* write common header, the version of kdump-compressed format is 6th */
|
|
size = sizeof(DiskDumpHeader64);
|
|
dh = g_malloc0(size);
|
|
|
|
strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE));
|
|
dh->header_version = cpu_convert_to_target32(6, endian);
|
|
block_size = s->page_size;
|
|
dh->block_size = cpu_convert_to_target32(block_size, endian);
|
|
sub_hdr_size = sizeof(struct KdumpSubHeader64) + s->note_size;
|
|
sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size);
|
|
dh->sub_hdr_size = cpu_convert_to_target32(sub_hdr_size, endian);
|
|
/* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */
|
|
dh->max_mapnr = cpu_convert_to_target32(MIN(s->max_mapnr, UINT_MAX),
|
|
endian);
|
|
dh->nr_cpus = cpu_convert_to_target32(s->nr_cpus, endian);
|
|
bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2;
|
|
dh->bitmap_blocks = cpu_convert_to_target32(bitmap_blocks, endian);
|
|
memcpy(&(dh->utsname.machine), "x86_64", 6);
|
|
|
|
if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) {
|
|
status |= DUMP_DH_COMPRESSED_ZLIB;
|
|
}
|
|
#ifdef CONFIG_LZO
|
|
if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) {
|
|
status |= DUMP_DH_COMPRESSED_LZO;
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_SNAPPY
|
|
if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) {
|
|
status |= DUMP_DH_COMPRESSED_SNAPPY;
|
|
}
|
|
#endif
|
|
dh->status = cpu_convert_to_target32(status, endian);
|
|
|
|
if (write_buffer(s->fd, 0, dh, size) < 0) {
|
|
dump_error(s, "dump: failed to write disk dump header.\n");
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
/* write sub header */
|
|
size = sizeof(KdumpSubHeader64);
|
|
kh = g_malloc0(size);
|
|
|
|
/* 64bit max_mapnr_64 */
|
|
kh->max_mapnr_64 = cpu_convert_to_target64(s->max_mapnr, endian);
|
|
kh->phys_base = cpu_convert_to_target64(PHYS_BASE, endian);
|
|
kh->dump_level = cpu_convert_to_target32(DUMP_LEVEL, endian);
|
|
|
|
offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size;
|
|
kh->offset_note = cpu_convert_to_target64(offset_note, endian);
|
|
kh->note_size = cpu_convert_to_target64(s->note_size, endian);
|
|
|
|
if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS *
|
|
block_size, kh, size) < 0) {
|
|
dump_error(s, "dump: failed to write kdump sub header.\n");
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
/* write note */
|
|
s->note_buf = g_malloc0(s->note_size);
|
|
s->note_buf_offset = 0;
|
|
|
|
/* use s->note_buf to store notes temporarily */
|
|
if (write_elf64_notes(buf_write_note, s) < 0) {
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
if (write_buffer(s->fd, offset_note, s->note_buf,
|
|
s->note_size) < 0) {
|
|
dump_error(s, "dump: failed to write notes");
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
/* get offset of dump_bitmap */
|
|
s->offset_dump_bitmap = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size) *
|
|
block_size;
|
|
|
|
/* get offset of page */
|
|
s->offset_page = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size + bitmap_blocks) *
|
|
block_size;
|
|
|
|
out:
|
|
g_free(dh);
|
|
g_free(kh);
|
|
g_free(s->note_buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int write_dump_header(DumpState *s)
|
|
{
|
|
if (s->dump_info.d_machine == EM_386) {
|
|
return create_header32(s);
|
|
} else {
|
|
return create_header64(s);
|
|
}
|
|
}
|
|
|
|
static ram_addr_t get_start_block(DumpState *s)
|
|
{
|
|
GuestPhysBlock *block;
|
|
|
|
if (!s->has_filter) {
|
|
s->next_block = QTAILQ_FIRST(&s->guest_phys_blocks.head);
|
|
return 0;
|
|
}
|
|
|
|
QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) {
|
|
if (block->target_start >= s->begin + s->length ||
|
|
block->target_end <= s->begin) {
|
|
/* This block is out of the range */
|
|
continue;
|
|
}
|
|
|
|
s->next_block = block;
|
|
if (s->begin > block->target_start) {
|
|
s->start = s->begin - block->target_start;
|
|
} else {
|
|
s->start = 0;
|
|
}
|
|
return s->start;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
static void get_max_mapnr(DumpState *s)
|
|
{
|
|
GuestPhysBlock *last_block;
|
|
|
|
last_block = QTAILQ_LAST(&s->guest_phys_blocks.head, GuestPhysBlockHead);
|
|
s->max_mapnr = paddr_to_pfn(last_block->target_end, s->page_shift);
|
|
}
|
|
|
|
static int dump_init(DumpState *s, int fd, bool 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;
|
|
CPU_FOREACH(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 (s->note_size < 0) {
|
|
error_set(errp, QERR_UNSUPPORTED);
|
|
goto cleanup;
|
|
}
|
|
|
|
/* get memory mapping */
|
|
memory_mapping_list_init(&s->list);
|
|
if (paging) {
|
|
qemu_get_guest_memory_mapping(&s->list, &s->guest_phys_blocks, &err);
|
|
if (err != NULL) {
|
|
error_propagate(errp, err);
|
|
goto cleanup;
|
|
}
|
|
} else {
|
|
qemu_get_guest_simple_memory_mapping(&s->list, &s->guest_phys_blocks);
|
|
}
|
|
|
|
s->nr_cpus = nr_cpus;
|
|
s->page_size = TARGET_PAGE_SIZE;
|
|
s->page_shift = ffs(s->page_size) - 1;
|
|
|
|
get_max_mapnr(s);
|
|
|
|
uint64_t tmp;
|
|
tmp = DIV_ROUND_UP(DIV_ROUND_UP(s->max_mapnr, CHAR_BIT), s->page_size);
|
|
s->len_dump_bitmap = tmp * s->page_size;
|
|
|
|
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);
|
|
}
|