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https://github.com/Motorhead1991/qemu.git
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dump: add API to write dump header
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>
This commit is contained in:
qiaonuohan
Luiz Capitulino
parent
7aad248d35
commit
298f116827
2 changed files with 319 additions and 0 deletions
223
dump.c
223
dump.c
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@ -778,6 +778,229 @@ static int buf_write_note(const void *buf, size_t size, void *opaque)
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return 0;
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}
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/* write common header, sub header and elf note to vmcore */
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static int create_header32(DumpState *s)
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{
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int ret = 0;
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DiskDumpHeader32 *dh = NULL;
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KdumpSubHeader32 *kh = NULL;
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size_t size;
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int endian = s->dump_info.d_endian;
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uint32_t block_size;
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uint32_t sub_hdr_size;
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uint32_t bitmap_blocks;
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uint32_t status = 0;
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uint64_t offset_note;
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/* write common header, the version of kdump-compressed format is 6th */
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size = sizeof(DiskDumpHeader32);
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dh = g_malloc0(size);
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strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE));
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dh->header_version = cpu_convert_to_target32(6, endian);
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block_size = s->page_size;
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dh->block_size = cpu_convert_to_target32(block_size, endian);
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sub_hdr_size = sizeof(struct KdumpSubHeader32) + s->note_size;
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sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size);
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dh->sub_hdr_size = cpu_convert_to_target32(sub_hdr_size, endian);
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/* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */
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dh->max_mapnr = cpu_convert_to_target32(MIN(s->max_mapnr, UINT_MAX),
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endian);
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dh->nr_cpus = cpu_convert_to_target32(s->nr_cpus, endian);
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bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2;
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dh->bitmap_blocks = cpu_convert_to_target32(bitmap_blocks, endian);
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memcpy(&(dh->utsname.machine), "i686", 4);
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if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) {
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status |= DUMP_DH_COMPRESSED_ZLIB;
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}
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#ifdef CONFIG_LZO
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if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) {
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status |= DUMP_DH_COMPRESSED_LZO;
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}
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#endif
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#ifdef CONFIG_SNAPPY
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if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) {
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status |= DUMP_DH_COMPRESSED_SNAPPY;
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}
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#endif
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dh->status = cpu_convert_to_target32(status, endian);
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if (write_buffer(s->fd, 0, dh, size) < 0) {
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dump_error(s, "dump: failed to write disk dump header.\n");
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ret = -1;
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goto out;
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}
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/* write sub header */
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size = sizeof(KdumpSubHeader32);
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kh = g_malloc0(size);
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/* 64bit max_mapnr_64 */
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kh->max_mapnr_64 = cpu_convert_to_target64(s->max_mapnr, endian);
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kh->phys_base = cpu_convert_to_target32(PHYS_BASE, endian);
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kh->dump_level = cpu_convert_to_target32(DUMP_LEVEL, endian);
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offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size;
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kh->offset_note = cpu_convert_to_target64(offset_note, endian);
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kh->note_size = cpu_convert_to_target32(s->note_size, endian);
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if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS *
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block_size, kh, size) < 0) {
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dump_error(s, "dump: failed to write kdump sub header.\n");
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ret = -1;
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goto out;
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}
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/* write note */
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s->note_buf = g_malloc0(s->note_size);
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s->note_buf_offset = 0;
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/* use s->note_buf to store notes temporarily */
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if (write_elf32_notes(buf_write_note, s) < 0) {
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ret = -1;
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goto out;
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}
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if (write_buffer(s->fd, offset_note, s->note_buf,
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s->note_size) < 0) {
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dump_error(s, "dump: failed to write notes");
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ret = -1;
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goto out;
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}
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/* get offset of dump_bitmap */
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s->offset_dump_bitmap = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size) *
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block_size;
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/* get offset of page */
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s->offset_page = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size + bitmap_blocks) *
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block_size;
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out:
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g_free(dh);
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g_free(kh);
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g_free(s->note_buf);
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return ret;
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}
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/* write common header, sub header and elf note to vmcore */
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static int create_header64(DumpState *s)
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{
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int ret = 0;
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DiskDumpHeader64 *dh = NULL;
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KdumpSubHeader64 *kh = NULL;
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size_t size;
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int endian = s->dump_info.d_endian;
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uint32_t block_size;
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uint32_t sub_hdr_size;
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uint32_t bitmap_blocks;
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uint32_t status = 0;
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uint64_t offset_note;
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/* write common header, the version of kdump-compressed format is 6th */
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size = sizeof(DiskDumpHeader64);
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dh = g_malloc0(size);
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strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE));
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dh->header_version = cpu_convert_to_target32(6, endian);
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block_size = s->page_size;
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dh->block_size = cpu_convert_to_target32(block_size, endian);
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sub_hdr_size = sizeof(struct KdumpSubHeader64) + s->note_size;
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sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size);
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dh->sub_hdr_size = cpu_convert_to_target32(sub_hdr_size, endian);
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/* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */
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dh->max_mapnr = cpu_convert_to_target32(MIN(s->max_mapnr, UINT_MAX),
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endian);
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dh->nr_cpus = cpu_convert_to_target32(s->nr_cpus, endian);
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bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2;
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dh->bitmap_blocks = cpu_convert_to_target32(bitmap_blocks, endian);
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memcpy(&(dh->utsname.machine), "x86_64", 6);
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if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) {
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status |= DUMP_DH_COMPRESSED_ZLIB;
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}
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#ifdef CONFIG_LZO
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if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) {
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status |= DUMP_DH_COMPRESSED_LZO;
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}
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#endif
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#ifdef CONFIG_SNAPPY
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if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) {
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status |= DUMP_DH_COMPRESSED_SNAPPY;
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}
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#endif
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dh->status = cpu_convert_to_target32(status, endian);
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if (write_buffer(s->fd, 0, dh, size) < 0) {
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dump_error(s, "dump: failed to write disk dump header.\n");
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ret = -1;
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goto out;
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}
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/* write sub header */
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size = sizeof(KdumpSubHeader64);
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kh = g_malloc0(size);
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/* 64bit max_mapnr_64 */
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kh->max_mapnr_64 = cpu_convert_to_target64(s->max_mapnr, endian);
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kh->phys_base = cpu_convert_to_target64(PHYS_BASE, endian);
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kh->dump_level = cpu_convert_to_target32(DUMP_LEVEL, endian);
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offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size;
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kh->offset_note = cpu_convert_to_target64(offset_note, endian);
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kh->note_size = cpu_convert_to_target64(s->note_size, endian);
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if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS *
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block_size, kh, size) < 0) {
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dump_error(s, "dump: failed to write kdump sub header.\n");
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ret = -1;
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goto out;
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}
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/* write note */
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s->note_buf = g_malloc0(s->note_size);
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s->note_buf_offset = 0;
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/* use s->note_buf to store notes temporarily */
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if (write_elf64_notes(buf_write_note, s) < 0) {
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ret = -1;
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goto out;
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}
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if (write_buffer(s->fd, offset_note, s->note_buf,
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s->note_size) < 0) {
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dump_error(s, "dump: failed to write notes");
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ret = -1;
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goto out;
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}
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/* get offset of dump_bitmap */
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s->offset_dump_bitmap = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size) *
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block_size;
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/* get offset of page */
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s->offset_page = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size + bitmap_blocks) *
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block_size;
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out:
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g_free(dh);
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g_free(kh);
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g_free(s->note_buf);
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return ret;
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}
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static int write_dump_header(DumpState *s)
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{
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if (s->dump_info.d_machine == EM_386) {
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return create_header32(s);
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} else {
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return create_header64(s);
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}
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}
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static ram_addr_t get_start_block(DumpState *s)
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{
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GuestPhysBlock *block;
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