diff options
Diffstat (limited to 'src/dump.c')
| -rw-r--r-- | src/dump.c | 1714 |
1 files changed, 1714 insertions, 0 deletions
diff --git a/src/dump.c b/src/dump.c new file mode 100644 index 0000000..78b7d84 --- /dev/null +++ b/src/dump.c @@ -0,0 +1,1714 @@ +/* + * QEMU dump + * + * Copyright Fujitsu, Corp. 2011, 2012 + * + * Authors: + * Wen Congyang <wency@cn.fujitsu.com> + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + * + */ + +#include "qemu-common.h" +#include "elf.h" +#include "cpu.h" +#include "exec/cpu-all.h" +#include "exec/hwaddr.h" +#include "monitor/monitor.h" +#include "sysemu/kvm.h" +#include "sysemu/dump.h" +#include "sysemu/sysemu.h" +#include "sysemu/memory_mapping.h" +#include "sysemu/cpus.h" +#include "qapi/error.h" +#include "qapi/qmp/qerror.h" +#include "qmp-commands.h" + +#include <zlib.h> +#ifdef CONFIG_LZO +#include <lzo/lzo1x.h> +#endif +#ifdef CONFIG_SNAPPY +#include <snappy-c.h> +#endif +#ifndef ELF_MACHINE_UNAME +#define ELF_MACHINE_UNAME "Unknown" +#endif + +uint16_t cpu_to_dump16(DumpState *s, uint16_t val) +{ + if (s->dump_info.d_endian == ELFDATA2LSB) { + val = cpu_to_le16(val); + } else { + val = cpu_to_be16(val); + } + + return val; +} + +uint32_t cpu_to_dump32(DumpState *s, uint32_t val) +{ + if (s->dump_info.d_endian == ELFDATA2LSB) { + val = cpu_to_le32(val); + } else { + val = cpu_to_be32(val); + } + + return val; +} + +uint64_t cpu_to_dump64(DumpState *s, uint64_t val) +{ + if (s->dump_info.d_endian == ELFDATA2LSB) { + val = cpu_to_le64(val); + } else { + val = cpu_to_be64(val); + } + + return val; +} + +static int dump_cleanup(DumpState *s) +{ + guest_phys_blocks_free(&s->guest_phys_blocks); + memory_mapping_list_free(&s->list); + close(s->fd); + if (s->resume) { + vm_start(); + } + + return 0; +} + +static void dump_error(DumpState *s, const char *reason, Error **errp) +{ + dump_cleanup(s); + error_setg(errp, "%s", reason); +} + +static int fd_write_vmcore(const void *buf, size_t size, void *opaque) +{ + DumpState *s = opaque; + size_t written_size; + + written_size = qemu_write_full(s->fd, buf, size); + if (written_size != size) { + return -1; + } + + return 0; +} + +static void write_elf64_header(DumpState *s, Error **errp) +{ + Elf64_Ehdr elf_header; + int ret; + + memset(&elf_header, 0, sizeof(Elf64_Ehdr)); + memcpy(&elf_header, ELFMAG, SELFMAG); + elf_header.e_ident[EI_CLASS] = ELFCLASS64; + elf_header.e_ident[EI_DATA] = s->dump_info.d_endian; + elf_header.e_ident[EI_VERSION] = EV_CURRENT; + elf_header.e_type = cpu_to_dump16(s, ET_CORE); + elf_header.e_machine = cpu_to_dump16(s, s->dump_info.d_machine); + elf_header.e_version = cpu_to_dump32(s, EV_CURRENT); + elf_header.e_ehsize = cpu_to_dump16(s, sizeof(elf_header)); + elf_header.e_phoff = cpu_to_dump64(s, sizeof(Elf64_Ehdr)); + elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf64_Phdr)); + elf_header.e_phnum = cpu_to_dump16(s, s->phdr_num); + if (s->have_section) { + uint64_t shoff = sizeof(Elf64_Ehdr) + sizeof(Elf64_Phdr) * s->sh_info; + + elf_header.e_shoff = cpu_to_dump64(s, shoff); + elf_header.e_shentsize = cpu_to_dump16(s, sizeof(Elf64_Shdr)); + elf_header.e_shnum = cpu_to_dump16(s, 1); + } + + ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s); + if (ret < 0) { + dump_error(s, "dump: failed to write elf header", errp); + } +} + +static void write_elf32_header(DumpState *s, Error **errp) +{ + Elf32_Ehdr elf_header; + int ret; + + memset(&elf_header, 0, sizeof(Elf32_Ehdr)); + memcpy(&elf_header, ELFMAG, SELFMAG); + elf_header.e_ident[EI_CLASS] = ELFCLASS32; + elf_header.e_ident[EI_DATA] = s->dump_info.d_endian; + elf_header.e_ident[EI_VERSION] = EV_CURRENT; + elf_header.e_type = cpu_to_dump16(s, ET_CORE); + elf_header.e_machine = cpu_to_dump16(s, s->dump_info.d_machine); + elf_header.e_version = cpu_to_dump32(s, EV_CURRENT); + elf_header.e_ehsize = cpu_to_dump16(s, sizeof(elf_header)); + elf_header.e_phoff = cpu_to_dump32(s, sizeof(Elf32_Ehdr)); + elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf32_Phdr)); + elf_header.e_phnum = cpu_to_dump16(s, s->phdr_num); + if (s->have_section) { + uint32_t shoff = sizeof(Elf32_Ehdr) + sizeof(Elf32_Phdr) * s->sh_info; + + elf_header.e_shoff = cpu_to_dump32(s, shoff); + elf_header.e_shentsize = cpu_to_dump16(s, sizeof(Elf32_Shdr)); + elf_header.e_shnum = cpu_to_dump16(s, 1); + } + + ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s); + if (ret < 0) { + dump_error(s, "dump: failed to write elf header", errp); + } +} + +static void write_elf64_load(DumpState *s, MemoryMapping *memory_mapping, + int phdr_index, hwaddr offset, + hwaddr filesz, Error **errp) +{ + Elf64_Phdr phdr; + int ret; + + memset(&phdr, 0, sizeof(Elf64_Phdr)); + phdr.p_type = cpu_to_dump32(s, PT_LOAD); + phdr.p_offset = cpu_to_dump64(s, offset); + phdr.p_paddr = cpu_to_dump64(s, memory_mapping->phys_addr); + phdr.p_filesz = cpu_to_dump64(s, filesz); + phdr.p_memsz = cpu_to_dump64(s, memory_mapping->length); + phdr.p_vaddr = cpu_to_dump64(s, memory_mapping->virt_addr); + + assert(memory_mapping->length >= filesz); + + ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s); + if (ret < 0) { + dump_error(s, "dump: failed to write program header table", errp); + } +} + +static void write_elf32_load(DumpState *s, MemoryMapping *memory_mapping, + int phdr_index, hwaddr offset, + hwaddr filesz, Error **errp) +{ + Elf32_Phdr phdr; + int ret; + + memset(&phdr, 0, sizeof(Elf32_Phdr)); + phdr.p_type = cpu_to_dump32(s, PT_LOAD); + phdr.p_offset = cpu_to_dump32(s, offset); + phdr.p_paddr = cpu_to_dump32(s, memory_mapping->phys_addr); + phdr.p_filesz = cpu_to_dump32(s, filesz); + phdr.p_memsz = cpu_to_dump32(s, memory_mapping->length); + phdr.p_vaddr = cpu_to_dump32(s, memory_mapping->virt_addr); + + assert(memory_mapping->length >= filesz); + + ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s); + if (ret < 0) { + dump_error(s, "dump: failed to write program header table", errp); + } +} + +static void write_elf64_note(DumpState *s, Error **errp) +{ + Elf64_Phdr phdr; + hwaddr begin = s->memory_offset - s->note_size; + int ret; + + memset(&phdr, 0, sizeof(Elf64_Phdr)); + phdr.p_type = cpu_to_dump32(s, PT_NOTE); + phdr.p_offset = cpu_to_dump64(s, begin); + phdr.p_paddr = 0; + phdr.p_filesz = cpu_to_dump64(s, s->note_size); + phdr.p_memsz = cpu_to_dump64(s, s->note_size); + phdr.p_vaddr = 0; + + ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s); + if (ret < 0) { + dump_error(s, "dump: failed to write program header table", errp); + } +} + +static inline int cpu_index(CPUState *cpu) +{ + return cpu->cpu_index + 1; +} + +static void write_elf64_notes(WriteCoreDumpFunction f, DumpState *s, + Error **errp) +{ + CPUState *cpu; + int ret; + int id; + + CPU_FOREACH(cpu) { + id = cpu_index(cpu); + ret = cpu_write_elf64_note(f, cpu, id, s); + if (ret < 0) { + dump_error(s, "dump: failed to write elf notes", errp); + return; + } + } + + CPU_FOREACH(cpu) { + ret = cpu_write_elf64_qemunote(f, cpu, s); + if (ret < 0) { + dump_error(s, "dump: failed to write CPU status", errp); + return; + } + } +} + +static void write_elf32_note(DumpState *s, Error **errp) +{ + hwaddr begin = s->memory_offset - s->note_size; + Elf32_Phdr phdr; + int ret; + + memset(&phdr, 0, sizeof(Elf32_Phdr)); + phdr.p_type = cpu_to_dump32(s, PT_NOTE); + phdr.p_offset = cpu_to_dump32(s, begin); + phdr.p_paddr = 0; + phdr.p_filesz = cpu_to_dump32(s, s->note_size); + phdr.p_memsz = cpu_to_dump32(s, s->note_size); + phdr.p_vaddr = 0; + + ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s); + if (ret < 0) { + dump_error(s, "dump: failed to write program header table", errp); + } +} + +static void write_elf32_notes(WriteCoreDumpFunction f, DumpState *s, + Error **errp) +{ + CPUState *cpu; + int ret; + int id; + + CPU_FOREACH(cpu) { + id = cpu_index(cpu); + ret = cpu_write_elf32_note(f, cpu, id, s); + if (ret < 0) { + dump_error(s, "dump: failed to write elf notes", errp); + return; + } + } + + CPU_FOREACH(cpu) { + ret = cpu_write_elf32_qemunote(f, cpu, s); + if (ret < 0) { + dump_error(s, "dump: failed to write CPU status", errp); + return; + } + } +} + +static void write_elf_section(DumpState *s, int type, Error **errp) +{ + Elf32_Shdr shdr32; + Elf64_Shdr shdr64; + int shdr_size; + void *shdr; + int ret; + + if (type == 0) { + shdr_size = sizeof(Elf32_Shdr); + memset(&shdr32, 0, shdr_size); + shdr32.sh_info = cpu_to_dump32(s, s->sh_info); + shdr = &shdr32; + } else { + shdr_size = sizeof(Elf64_Shdr); + memset(&shdr64, 0, shdr_size); + shdr64.sh_info = cpu_to_dump32(s, s->sh_info); + shdr = &shdr64; + } + + ret = fd_write_vmcore(&shdr, shdr_size, s); + if (ret < 0) { + dump_error(s, "dump: failed to write section header table", errp); + } +} + +static void write_data(DumpState *s, void *buf, int length, Error **errp) +{ + int ret; + + ret = fd_write_vmcore(buf, length, s); + if (ret < 0) { + dump_error(s, "dump: failed to save memory", errp); + } +} + +/* write the memory to vmcore. 1 page per I/O. */ +static void write_memory(DumpState *s, GuestPhysBlock *block, ram_addr_t start, + int64_t size, Error **errp) +{ + int64_t i; + Error *local_err = NULL; + + for (i = 0; i < size / TARGET_PAGE_SIZE; i++) { + write_data(s, block->host_addr + start + i * TARGET_PAGE_SIZE, + TARGET_PAGE_SIZE, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + } + + if ((size % TARGET_PAGE_SIZE) != 0) { + write_data(s, block->host_addr + start + i * TARGET_PAGE_SIZE, + size % TARGET_PAGE_SIZE, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + } +} + +/* get the memory's offset and size in the vmcore */ +static void get_offset_range(hwaddr phys_addr, + ram_addr_t mapping_length, + DumpState *s, + hwaddr *p_offset, + hwaddr *p_filesz) +{ + GuestPhysBlock *block; + hwaddr offset = s->memory_offset; + int64_t size_in_block, start; + + /* When the memory is not stored into vmcore, offset will be -1 */ + *p_offset = -1; + *p_filesz = 0; + + if (s->has_filter) { + if (phys_addr < s->begin || phys_addr >= s->begin + s->length) { + return; + } + } + + QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) { + if (s->has_filter) { + if (block->target_start >= s->begin + s->length || + block->target_end <= s->begin) { + /* This block is out of the range */ + continue; + } + + if (s->begin <= block->target_start) { + start = block->target_start; + } else { + start = s->begin; + } + + size_in_block = block->target_end - start; + if (s->begin + s->length < block->target_end) { + size_in_block -= block->target_end - (s->begin + s->length); + } + } else { + start = block->target_start; + size_in_block = block->target_end - block->target_start; + } + + if (phys_addr >= start && phys_addr < start + size_in_block) { + *p_offset = phys_addr - start + offset; + + /* The offset range mapped from the vmcore file must not spill over + * the GuestPhysBlock, clamp it. The rest of the mapping will be + * zero-filled in memory at load time; see + * <http://refspecs.linuxbase.org/elf/gabi4+/ch5.pheader.html>. + */ + *p_filesz = phys_addr + mapping_length <= start + size_in_block ? + mapping_length : + size_in_block - (phys_addr - start); + return; + } + + offset += size_in_block; + } +} + +static void write_elf_loads(DumpState *s, Error **errp) +{ + hwaddr offset, filesz; + MemoryMapping *memory_mapping; + uint32_t phdr_index = 1; + uint32_t max_index; + Error *local_err = NULL; + + 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) { + write_elf64_load(s, memory_mapping, phdr_index++, offset, + filesz, &local_err); + } else { + write_elf32_load(s, memory_mapping, phdr_index++, offset, + filesz, &local_err); + } + + if (local_err) { + error_propagate(errp, local_err); + return; + } + + if (phdr_index >= max_index) { + break; + } + } +} + +/* write elf header, PT_NOTE and elf note to vmcore. */ +static void dump_begin(DumpState *s, Error **errp) +{ + Error *local_err = NULL; + + /* + * 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) { + write_elf64_header(s, &local_err); + } else { + write_elf32_header(s, &local_err); + } + if (local_err) { + error_propagate(errp, local_err); + return; + } + + if (s->dump_info.d_class == ELFCLASS64) { + /* write PT_NOTE to vmcore */ + write_elf64_note(s, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + + /* write all PT_LOAD to vmcore */ + write_elf_loads(s, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + + /* write section to vmcore */ + if (s->have_section) { + write_elf_section(s, 1, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + } + + /* write notes to vmcore */ + write_elf64_notes(fd_write_vmcore, s, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + } else { + /* write PT_NOTE to vmcore */ + write_elf32_note(s, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + + /* write all PT_LOAD to vmcore */ + write_elf_loads(s, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + + /* write section to vmcore */ + if (s->have_section) { + write_elf_section(s, 0, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + } + + /* write notes to vmcore */ + write_elf32_notes(fd_write_vmcore, s, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + } +} + +static void dump_completed(DumpState *s) +{ + dump_cleanup(s); +} + +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 void dump_iterate(DumpState *s, Error **errp) +{ + GuestPhysBlock *block; + int64_t size; + Error *local_err = NULL; + + do { + 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); + } + } + write_memory(s, block, s->start, size, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + + } while (!get_next_block(s, block)); + + dump_completed(s); +} + +static void create_vmcore(DumpState *s, Error **errp) +{ + Error *local_err = NULL; + + dump_begin(s, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + + dump_iterate(s, errp); +} + +static int write_start_flat_header(int fd) +{ + MakedumpfileHeader *mh; + int ret = 0; + + QEMU_BUILD_BUG_ON(sizeof *mh > MAX_SIZE_MDF_HEADER); + mh = g_malloc0(MAX_SIZE_MDF_HEADER); + + memcpy(mh->signature, MAKEDUMPFILE_SIGNATURE, + MIN(sizeof mh->signature, sizeof MAKEDUMPFILE_SIGNATURE)); + + mh->type = cpu_to_be64(TYPE_FLAT_HEADER); + mh->version = cpu_to_be64(VERSION_FLAT_HEADER); + + size_t written_size; + written_size = qemu_write_full(fd, mh, MAX_SIZE_MDF_HEADER); + if (written_size != MAX_SIZE_MDF_HEADER) { + ret = -1; + } + + g_free(mh); + return ret; +} + +static int write_end_flat_header(int fd) +{ + MakedumpfileDataHeader mdh; + + mdh.offset = END_FLAG_FLAT_HEADER; + mdh.buf_size = END_FLAG_FLAT_HEADER; + + size_t written_size; + written_size = qemu_write_full(fd, &mdh, sizeof(mdh)); + if (written_size != sizeof(mdh)) { + return -1; + } + + return 0; +} + +static int write_buffer(int fd, off_t offset, const void *buf, size_t size) +{ + size_t written_size; + MakedumpfileDataHeader mdh; + + mdh.offset = cpu_to_be64(offset); + mdh.buf_size = cpu_to_be64(size); + + written_size = qemu_write_full(fd, &mdh, sizeof(mdh)); + if (written_size != sizeof(mdh)) { + return -1; + } + + written_size = qemu_write_full(fd, buf, size); + if (written_size != size) { + return -1; + } + + return 0; +} + +static int buf_write_note(const void *buf, size_t size, void *opaque) +{ + DumpState *s = opaque; + + /* note_buf is not enough */ + if (s->note_buf_offset + size > s->note_size) { + return -1; + } + + memcpy(s->note_buf + s->note_buf_offset, buf, size); + + s->note_buf_offset += size; + + return 0; +} + +/* write common header, sub header and elf note to vmcore */ +static void create_header32(DumpState *s, Error **errp) +{ + DiskDumpHeader32 *dh = NULL; + KdumpSubHeader32 *kh = NULL; + size_t size; + uint32_t block_size; + uint32_t sub_hdr_size; + uint32_t bitmap_blocks; + uint32_t status = 0; + uint64_t offset_note; + Error *local_err = NULL; + + /* 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_to_dump32(s, 6); + block_size = TARGET_PAGE_SIZE; + dh->block_size = cpu_to_dump32(s, block_size); + 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_to_dump32(s, sub_hdr_size); + /* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */ + dh->max_mapnr = cpu_to_dump32(s, MIN(s->max_mapnr, UINT_MAX)); + dh->nr_cpus = cpu_to_dump32(s, s->nr_cpus); + bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2; + dh->bitmap_blocks = cpu_to_dump32(s, bitmap_blocks); + strncpy(dh->utsname.machine, ELF_MACHINE_UNAME, sizeof(dh->utsname.machine)); + + if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) { + status |= DUMP_DH_COMPRESSED_ZLIB; + } +#ifdef CONFIG_LZO + if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) { + status |= DUMP_DH_COMPRESSED_LZO; + } +#endif +#ifdef CONFIG_SNAPPY + if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) { + status |= DUMP_DH_COMPRESSED_SNAPPY; + } +#endif + dh->status = cpu_to_dump32(s, status); + + if (write_buffer(s->fd, 0, dh, size) < 0) { + dump_error(s, "dump: failed to write disk dump header", errp); + goto out; + } + + /* write sub header */ + size = sizeof(KdumpSubHeader32); + kh = g_malloc0(size); + + /* 64bit max_mapnr_64 */ + kh->max_mapnr_64 = cpu_to_dump64(s, s->max_mapnr); + kh->phys_base = cpu_to_dump32(s, PHYS_BASE); + kh->dump_level = cpu_to_dump32(s, DUMP_LEVEL); + + offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size; + kh->offset_note = cpu_to_dump64(s, offset_note); + kh->note_size = cpu_to_dump32(s, s->note_size); + + if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS * + block_size, kh, size) < 0) { + dump_error(s, "dump: failed to write kdump sub header", errp); + 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 */ + write_elf32_notes(buf_write_note, s, &local_err); + if (local_err) { + error_propagate(errp, local_err); + goto out; + } + if (write_buffer(s->fd, offset_note, s->note_buf, + s->note_size) < 0) { + dump_error(s, "dump: failed to write notes", errp); + 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); +} + +/* write common header, sub header and elf note to vmcore */ +static void create_header64(DumpState *s, Error **errp) +{ + DiskDumpHeader64 *dh = NULL; + KdumpSubHeader64 *kh = NULL; + size_t size; + uint32_t block_size; + uint32_t sub_hdr_size; + uint32_t bitmap_blocks; + uint32_t status = 0; + uint64_t offset_note; + Error *local_err = NULL; + + /* 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_to_dump32(s, 6); + block_size = TARGET_PAGE_SIZE; + dh->block_size = cpu_to_dump32(s, block_size); + 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_to_dump32(s, sub_hdr_size); + /* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */ + dh->max_mapnr = cpu_to_dump32(s, MIN(s->max_mapnr, UINT_MAX)); + dh->nr_cpus = cpu_to_dump32(s, s->nr_cpus); + bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2; + dh->bitmap_blocks = cpu_to_dump32(s, bitmap_blocks); + strncpy(dh->utsname.machine, ELF_MACHINE_UNAME, sizeof(dh->utsname.machine)); + + if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) { + status |= DUMP_DH_COMPRESSED_ZLIB; + } +#ifdef CONFIG_LZO + if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) { + status |= DUMP_DH_COMPRESSED_LZO; + } +#endif +#ifdef CONFIG_SNAPPY + if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) { + status |= DUMP_DH_COMPRESSED_SNAPPY; + } +#endif + dh->status = cpu_to_dump32(s, status); + + if (write_buffer(s->fd, 0, dh, size) < 0) { + dump_error(s, "dump: failed to write disk dump header", errp); + goto out; + } + + /* write sub header */ + size = sizeof(KdumpSubHeader64); + kh = g_malloc0(size); + + /* 64bit max_mapnr_64 */ + kh->max_mapnr_64 = cpu_to_dump64(s, s->max_mapnr); + kh->phys_base = cpu_to_dump64(s, PHYS_BASE); + kh->dump_level = cpu_to_dump32(s, DUMP_LEVEL); + + offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size; + kh->offset_note = cpu_to_dump64(s, offset_note); + kh->note_size = cpu_to_dump64(s, s->note_size); + + if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS * + block_size, kh, size) < 0) { + dump_error(s, "dump: failed to write kdump sub header", errp); + 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 */ + write_elf64_notes(buf_write_note, s, &local_err); + if (local_err) { + error_propagate(errp, local_err); + goto out; + } + + if (write_buffer(s->fd, offset_note, s->note_buf, + s->note_size) < 0) { + dump_error(s, "dump: failed to write notes", errp); + 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); +} + +static void write_dump_header(DumpState *s, Error **errp) +{ + Error *local_err = NULL; + + if (s->dump_info.d_class == ELFCLASS32) { + create_header32(s, &local_err); + } else { + create_header64(s, &local_err); + } + if (local_err) { + error_propagate(errp, local_err); + } +} + +/* + * set dump_bitmap sequencely. the bit before last_pfn is not allowed to be + * rewritten, so if need to set the first bit, set last_pfn and pfn to 0. + * set_dump_bitmap will always leave the recently set bit un-sync. And setting + * (last bit + sizeof(buf) * 8) to 0 will do flushing the content in buf into + * vmcore, ie. synchronizing un-sync bit into vmcore. + */ +static int set_dump_bitmap(uint64_t last_pfn, uint64_t pfn, bool value, + uint8_t *buf, DumpState *s) +{ + off_t old_offset, new_offset; + off_t offset_bitmap1, offset_bitmap2; + uint32_t byte, bit; + + /* should not set the previous place */ + assert(last_pfn <= pfn); + + /* + * if the bit needed to be set is not cached in buf, flush the data in buf + * to vmcore firstly. + * making new_offset be bigger than old_offset can also sync remained data + * into vmcore. + */ + old_offset = BUFSIZE_BITMAP * (last_pfn / PFN_BUFBITMAP); + new_offset = BUFSIZE_BITMAP * (pfn / PFN_BUFBITMAP); + + while (old_offset < new_offset) { + /* calculate the offset and write dump_bitmap */ + offset_bitmap1 = s->offset_dump_bitmap + old_offset; + if (write_buffer(s->fd, offset_bitmap1, buf, + BUFSIZE_BITMAP) < 0) { + return -1; + } + + /* dump level 1 is chosen, so 1st and 2nd bitmap are same */ + offset_bitmap2 = s->offset_dump_bitmap + s->len_dump_bitmap + + old_offset; + if (write_buffer(s->fd, offset_bitmap2, buf, + BUFSIZE_BITMAP) < 0) { + return -1; + } + + memset(buf, 0, BUFSIZE_BITMAP); + old_offset += BUFSIZE_BITMAP; + } + + /* get the exact place of the bit in the buf, and set it */ + byte = (pfn % PFN_BUFBITMAP) / CHAR_BIT; + bit = (pfn % PFN_BUFBITMAP) % CHAR_BIT; + if (value) { + buf[byte] |= 1u << bit; + } else { + buf[byte] &= ~(1u << bit); + } + + return 0; +} + +/* + * exam every page and return the page frame number and the address of the page. + * bufptr can be NULL. note: the blocks here is supposed to reflect guest-phys + * blocks, so block->target_start and block->target_end should be interal + * multiples of the target page size. + */ +static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr, + uint8_t **bufptr, DumpState *s) +{ + GuestPhysBlock *block = *blockptr; + hwaddr addr; + uint8_t *buf; + + /* block == NULL means the start of the iteration */ + if (!block) { + block = QTAILQ_FIRST(&s->guest_phys_blocks.head); + *blockptr = block; + assert((block->target_start & ~TARGET_PAGE_MASK) == 0); + assert((block->target_end & ~TARGET_PAGE_MASK) == 0); + *pfnptr = paddr_to_pfn(block->target_start); + if (bufptr) { + *bufptr = block->host_addr; + } + return true; + } + + *pfnptr = *pfnptr + 1; + addr = pfn_to_paddr(*pfnptr); + + if ((addr >= block->target_start) && + (addr + TARGET_PAGE_SIZE <= block->target_end)) { + buf = block->host_addr + (addr - block->target_start); + } else { + /* the next page is in the next block */ + block = QTAILQ_NEXT(block, next); + *blockptr = block; + if (!block) { + return false; + } + assert((block->target_start & ~TARGET_PAGE_MASK) == 0); + assert((block->target_end & ~TARGET_PAGE_MASK) == 0); + *pfnptr = paddr_to_pfn(block->target_start); + buf = block->host_addr; + } + + if (bufptr) { + *bufptr = buf; + } + + return true; +} + +static void write_dump_bitmap(DumpState *s, Error **errp) +{ + int ret = 0; + uint64_t last_pfn, pfn; + void *dump_bitmap_buf; + size_t num_dumpable; + GuestPhysBlock *block_iter = NULL; + + /* dump_bitmap_buf is used to store dump_bitmap temporarily */ + dump_bitmap_buf = g_malloc0(BUFSIZE_BITMAP); + + num_dumpable = 0; + last_pfn = 0; + + /* + * exam memory page by page, and set the bit in dump_bitmap corresponded + * to the existing page. + */ + while (get_next_page(&block_iter, &pfn, NULL, s)) { + ret = set_dump_bitmap(last_pfn, pfn, true, dump_bitmap_buf, s); + if (ret < 0) { + dump_error(s, "dump: failed to set dump_bitmap", errp); + goto out; + } + + last_pfn = pfn; + num_dumpable++; + } + + /* + * set_dump_bitmap will always leave the recently set bit un-sync. Here we + * set last_pfn + PFN_BUFBITMAP to 0 and those set but un-sync bit will be + * synchronized into vmcore. + */ + if (num_dumpable > 0) { + ret = set_dump_bitmap(last_pfn, last_pfn + PFN_BUFBITMAP, false, + dump_bitmap_buf, s); + if (ret < 0) { + dump_error(s, "dump: failed to sync dump_bitmap", errp); + goto out; + } + } + + /* number of dumpable pages that will be dumped later */ + s->num_dumpable = num_dumpable; + +out: + g_free(dump_bitmap_buf); +} + +static void prepare_data_cache(DataCache *data_cache, DumpState *s, + off_t offset) +{ + data_cache->fd = s->fd; + data_cache->data_size = 0; + data_cache->buf_size = BUFSIZE_DATA_CACHE; + data_cache->buf = g_malloc0(BUFSIZE_DATA_CACHE); + data_cache->offset = offset; +} + +static int write_cache(DataCache *dc, const void *buf, size_t size, + bool flag_sync) +{ + /* + * dc->buf_size should not be less than size, otherwise dc will never be + * enough + */ + assert(size <= dc->buf_size); + + /* + * if flag_sync is set, synchronize data in dc->buf into vmcore. + * otherwise check if the space is enough for caching data in buf, if not, + * write the data in dc->buf to dc->fd and reset dc->buf + */ + if ((!flag_sync && dc->data_size + size > dc->buf_size) || + (flag_sync && dc->data_size > 0)) { + if (write_buffer(dc->fd, dc->offset, dc->buf, dc->data_size) < 0) { + return -1; + } + + dc->offset += dc->data_size; + dc->data_size = 0; + } + + if (!flag_sync) { + memcpy(dc->buf + dc->data_size, buf, size); + dc->data_size += size; + } + + return 0; +} + +static void free_data_cache(DataCache *data_cache) +{ + g_free(data_cache->buf); +} + +static size_t get_len_buf_out(size_t page_size, uint32_t flag_compress) +{ + switch (flag_compress) { + case DUMP_DH_COMPRESSED_ZLIB: + return compressBound(page_size); + + case DUMP_DH_COMPRESSED_LZO: + /* + * LZO will expand incompressible data by a little amount. Please check + * the following URL to see the expansion calculation: + * http://www.oberhumer.com/opensource/lzo/lzofaq.php + */ + return page_size + page_size / 16 + 64 + 3; + +#ifdef CONFIG_SNAPPY + case DUMP_DH_COMPRESSED_SNAPPY: + return snappy_max_compressed_length(page_size); +#endif + } + return 0; +} + +/* + * check if the page is all 0 + */ +static inline bool is_zero_page(const uint8_t *buf, size_t page_size) +{ + return buffer_is_zero(buf, page_size); +} + +static void write_dump_pages(DumpState *s, Error **errp) +{ + int ret = 0; + DataCache page_desc, page_data; + size_t len_buf_out, size_out; +#ifdef CONFIG_LZO + lzo_bytep wrkmem = NULL; +#endif + uint8_t *buf_out = NULL; + off_t offset_desc, offset_data; + PageDescriptor pd, pd_zero; + uint8_t *buf; + GuestPhysBlock *block_iter = NULL; + uint64_t pfn_iter; + + /* get offset of page_desc and page_data in dump file */ + offset_desc = s->offset_page; + offset_data = offset_desc + sizeof(PageDescriptor) * s->num_dumpable; + + prepare_data_cache(&page_desc, s, offset_desc); + prepare_data_cache(&page_data, s, offset_data); + + /* prepare buffer to store compressed data */ + len_buf_out = get_len_buf_out(TARGET_PAGE_SIZE, s->flag_compress); + assert(len_buf_out != 0); + +#ifdef CONFIG_LZO + wrkmem = g_malloc(LZO1X_1_MEM_COMPRESS); +#endif + + buf_out = g_malloc(len_buf_out); + + /* + * init zero page's page_desc and page_data, because every zero page + * uses the same page_data + */ + pd_zero.size = cpu_to_dump32(s, TARGET_PAGE_SIZE); + pd_zero.flags = cpu_to_dump32(s, 0); + pd_zero.offset = cpu_to_dump64(s, offset_data); + pd_zero.page_flags = cpu_to_dump64(s, 0); + buf = g_malloc0(TARGET_PAGE_SIZE); + ret = write_cache(&page_data, buf, TARGET_PAGE_SIZE, false); + g_free(buf); + if (ret < 0) { + dump_error(s, "dump: failed to write page data (zero page)", errp); + goto out; + } + + offset_data += TARGET_PAGE_SIZE; + + /* + * dump memory to vmcore page by page. zero page will all be resided in the + * first page of page section + */ + while (get_next_page(&block_iter, &pfn_iter, &buf, s)) { + /* check zero page */ + if (is_zero_page(buf, TARGET_PAGE_SIZE)) { + ret = write_cache(&page_desc, &pd_zero, sizeof(PageDescriptor), + false); + if (ret < 0) { + dump_error(s, "dump: failed to write page desc", errp); + goto out; + } + } else { + /* + * not zero page, then: + * 1. compress the page + * 2. write the compressed page into the cache of page_data + * 3. get page desc of the compressed page and write it into the + * cache of page_desc + * + * only one compression format will be used here, for + * s->flag_compress is set. But when compression fails to work, + * we fall back to save in plaintext. + */ + size_out = len_buf_out; + if ((s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) && + (compress2(buf_out, (uLongf *)&size_out, buf, + TARGET_PAGE_SIZE, Z_BEST_SPEED) == Z_OK) && + (size_out < TARGET_PAGE_SIZE)) { + pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_ZLIB); + pd.size = cpu_to_dump32(s, size_out); + + ret = write_cache(&page_data, buf_out, size_out, false); + if (ret < 0) { + dump_error(s, "dump: failed to write page data", errp); + goto out; + } +#ifdef CONFIG_LZO + } else if ((s->flag_compress & DUMP_DH_COMPRESSED_LZO) && + (lzo1x_1_compress(buf, TARGET_PAGE_SIZE, buf_out, + (lzo_uint *)&size_out, wrkmem) == LZO_E_OK) && + (size_out < TARGET_PAGE_SIZE)) { + pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_LZO); + pd.size = cpu_to_dump32(s, size_out); + + ret = write_cache(&page_data, buf_out, size_out, false); + if (ret < 0) { + dump_error(s, "dump: failed to write page data", errp); + goto out; + } +#endif +#ifdef CONFIG_SNAPPY + } else if ((s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) && + (snappy_compress((char *)buf, TARGET_PAGE_SIZE, + (char *)buf_out, &size_out) == SNAPPY_OK) && + (size_out < TARGET_PAGE_SIZE)) { + pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_SNAPPY); + pd.size = cpu_to_dump32(s, size_out); + + ret = write_cache(&page_data, buf_out, size_out, false); + if (ret < 0) { + dump_error(s, "dump: failed to write page data", errp); + goto out; + } +#endif + } else { + /* + * fall back to save in plaintext, size_out should be + * assigned TARGET_PAGE_SIZE + */ + pd.flags = cpu_to_dump32(s, 0); + size_out = TARGET_PAGE_SIZE; + pd.size = cpu_to_dump32(s, size_out); + + ret = write_cache(&page_data, buf, TARGET_PAGE_SIZE, false); + if (ret < 0) { + dump_error(s, "dump: failed to write page data", errp); + goto out; + } + } + + /* get and write page desc here */ + pd.page_flags = cpu_to_dump64(s, 0); + pd.offset = cpu_to_dump64(s, offset_data); + offset_data += size_out; + + ret = write_cache(&page_desc, &pd, sizeof(PageDescriptor), false); + if (ret < 0) { + dump_error(s, "dump: failed to write page desc", errp); + goto out; + } + } + } + + ret = write_cache(&page_desc, NULL, 0, true); + if (ret < 0) { + dump_error(s, "dump: failed to sync cache for page_desc", errp); + goto out; + } + ret = write_cache(&page_data, NULL, 0, true); + if (ret < 0) { + dump_error(s, "dump: failed to sync cache for page_data", errp); + goto out; + } + +out: + free_data_cache(&page_desc); + free_data_cache(&page_data); + +#ifdef CONFIG_LZO + g_free(wrkmem); +#endif + + g_free(buf_out); +} + +static void create_kdump_vmcore(DumpState *s, Error **errp) +{ + int ret; + Error *local_err = NULL; + + /* + * the kdump-compressed format is: + * File offset + * +------------------------------------------+ 0x0 + * | main header (struct disk_dump_header) | + * |------------------------------------------+ block 1 + * | sub header (struct kdump_sub_header) | + * |------------------------------------------+ block 2 + * | 1st-dump_bitmap | + * |------------------------------------------+ block 2 + X blocks + * | 2nd-dump_bitmap | (aligned by block) + * |------------------------------------------+ block 2 + 2 * X blocks + * | page desc for pfn 0 (struct page_desc) | (aligned by block) + * | page desc for pfn 1 (struct page_desc) | + * | : | + * |------------------------------------------| (not aligned by block) + * | page data (pfn 0) | + * | page data (pfn 1) | + * | : | + * +------------------------------------------+ + */ + + ret = write_start_flat_header(s->fd); + if (ret < 0) { + dump_error(s, "dump: failed to write start flat header", errp); + return; + } + + write_dump_header(s, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + + write_dump_bitmap(s, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + + write_dump_pages(s, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + + ret = write_end_flat_header(s->fd); + if (ret < 0) { + dump_error(s, "dump: failed to write end flat header", errp); + return; + } + + dump_completed(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); +} + +static void dump_init(DumpState *s, int fd, bool has_format, + DumpGuestMemoryFormat format, bool paging, bool has_filter, + int64_t begin, int64_t length, Error **errp) +{ + CPUState *cpu; + int nr_cpus; + Error *err = NULL; + int ret; + + /* kdump-compressed is conflict with paging and filter */ + if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) { + assert(!paging && !has_filter); + } + + if (runstate_is_running()) { + vm_stop(RUN_STATE_SAVE_VM); + s->resume = true; + } else { + s->resume = false; + } + + /* If we use KVM, we should synchronize the registers before we get dump + * info or physmap info. + */ + cpu_synchronize_all_states(); + nr_cpus = 0; + CPU_FOREACH(cpu) { + nr_cpus++; + } + + s->fd = fd; + s->has_filter = has_filter; + s->begin = begin; + s->length = length; + + memory_mapping_list_init(&s->list); + + 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_setg(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_setg(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_setg(errp, QERR_UNSUPPORTED); + goto cleanup; + } + + /* get memory mapping */ + 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; + + get_max_mapnr(s); + + uint64_t tmp; + tmp = DIV_ROUND_UP(DIV_ROUND_UP(s->max_mapnr, CHAR_BIT), TARGET_PAGE_SIZE); + s->len_dump_bitmap = tmp * TARGET_PAGE_SIZE; + + /* init for kdump-compressed format */ + if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) { + switch (format) { + case DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB: + s->flag_compress = DUMP_DH_COMPRESSED_ZLIB; + break; + + case DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO: +#ifdef CONFIG_LZO + if (lzo_init() != LZO_E_OK) { + error_setg(errp, "failed to initialize the LZO library"); + goto cleanup; + } +#endif + s->flag_compress = DUMP_DH_COMPRESSED_LZO; + break; + + case DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY: + s->flag_compress = DUMP_DH_COMPRESSED_SNAPPY; + break; + + default: + s->flag_compress = 0; + } + + return; + } + + 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; + +cleanup: + dump_cleanup(s); +} + +void qmp_dump_guest_memory(bool paging, const char *file, bool has_begin, + int64_t begin, bool has_length, + int64_t length, bool has_format, + DumpGuestMemoryFormat format, Error **errp) +{ + const char *p; + int fd = -1; + DumpState *s; + Error *local_err = NULL; + + /* + * kdump-compressed format need the whole memory dumped, so paging or + * filter is not supported here. + */ + if ((has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) && + (paging || has_begin || has_length)) { + error_setg(errp, "kdump-compressed format doesn't support paging or " + "filter"); + return; + } + if (has_begin && !has_length) { + error_setg(errp, QERR_MISSING_PARAMETER, "length"); + return; + } + if (!has_begin && has_length) { + error_setg(errp, QERR_MISSING_PARAMETER, "begin"); + return; + } + + /* check whether lzo/snappy is supported */ +#ifndef CONFIG_LZO + if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO) { + error_setg(errp, "kdump-lzo is not available now"); + return; + } +#endif + +#ifndef CONFIG_SNAPPY + if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY) { + error_setg(errp, "kdump-snappy is not available now"); + return; + } +#endif + +#if !defined(WIN32) + if (strstart(file, "fd:", &p)) { + fd = monitor_get_fd(cur_mon, p, errp); + if (fd == -1) { + return; + } + } +#endif + + if (strstart(file, "file:", &p)) { + fd = qemu_open(p, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRUSR); + if (fd < 0) { + error_setg_file_open(errp, errno, p); + return; + } + } + + if (fd == -1) { + error_setg(errp, QERR_INVALID_PARAMETER, "protocol"); + return; + } + + s = g_malloc0(sizeof(DumpState)); + + dump_init(s, fd, has_format, format, paging, has_begin, + begin, length, &local_err); + if (local_err) { + g_free(s); + error_propagate(errp, local_err); + return; + } + + if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) { + create_kdump_vmcore(s, errp); + } else { + create_vmcore(s, errp); + } + + g_free(s); +} + +DumpGuestMemoryCapability *qmp_query_dump_guest_memory_capability(Error **errp) +{ + DumpGuestMemoryFormatList *item; + DumpGuestMemoryCapability *cap = + g_malloc0(sizeof(DumpGuestMemoryCapability)); + + /* elf is always available */ + item = g_malloc0(sizeof(DumpGuestMemoryFormatList)); + cap->formats = item; + item->value = DUMP_GUEST_MEMORY_FORMAT_ELF; + + /* kdump-zlib is always available */ + item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList)); + item = item->next; + item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB; + + /* add new item if kdump-lzo is available */ +#ifdef CONFIG_LZO + item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList)); + item = item->next; + item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO; +#endif + + /* add new item if kdump-snappy is available */ +#ifdef CONFIG_SNAPPY + item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList)); + item = item->next; + item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY; +#endif + + return cap; +} |
