qemu/include/system/dump.h

/*
 * 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.
 *
 */

#ifndef DUMP_H
#define DUMP_H

#include "qapi/qapi-types-dump.h"
#include "qemu/thread.h"

#define MAKEDUMPFILE_SIGNATURE      "makedumpfile"
#define MAX_SIZE_MDF_HEADER         (4096) /* max size of makedumpfile_header */
#define TYPE_FLAT_HEADER            (1)    /* type of flattened format */
#define VERSION_FLAT_HEADER         (1)    /* version of flattened format */
#define END_FLAG_FLAT_HEADER        (-1)

#ifndef ARCH_PFN_OFFSET
#define ARCH_PFN_OFFSET             (0)
#endif

/*
 * flag for compressed format
 */
#define DUMP_DH_COMPRESSED_ZLIB     (0x1)
#define DUMP_DH_COMPRESSED_LZO      (0x2)
#define DUMP_DH_COMPRESSED_SNAPPY   (0x4)

#define KDUMP_SIGNATURE             "KDUMP   "
#define SIG_LEN                     (sizeof(KDUMP_SIGNATURE) - 1)
#define DUMP_LEVEL                  (1)
#define DISKDUMP_HEADER_BLOCKS      (1)

#include "system/dump-arch.h"
#include "system/memory_mapping.h"

typedef struct QEMU_PACKED MakedumpfileHeader {
    char signature[16];     /* = "makedumpfile" */
    int64_t type;
    int64_t version;
} MakedumpfileHeader;

typedef struct QEMU_PACKED MakedumpfileDataHeader {
    int64_t offset;
    int64_t buf_size;
} MakedumpfileDataHeader;

typedef struct QEMU_PACKED NewUtsname {
    char sysname[65];
    char nodename[65];
    char release[65];
    char version[65];
    char machine[65];
    char domainname[65];
} NewUtsname;

typedef struct QEMU_PACKED DiskDumpHeader32 {
    char signature[SIG_LEN];        /* = "KDUMP   " */
    uint32_t header_version;        /* Dump header version */
    NewUtsname utsname;             /* copy of system_utsname */
    char timestamp[10];             /* Time stamp */
    uint32_t status;                /* Above flags */
    uint32_t block_size;            /* Size of a block in byte */
    uint32_t sub_hdr_size;          /* Size of arch dependent header in block */
    uint32_t bitmap_blocks;         /* Size of Memory bitmap in block */
    uint32_t max_mapnr;             /* = max_mapnr ,
                                       obsoleted in header_version 6 */
    uint32_t total_ram_blocks;      /* Number of blocks should be written */
    uint32_t device_blocks;         /* Number of total blocks in dump device */
    uint32_t written_blocks;        /* Number of written blocks */
    uint32_t current_cpu;           /* CPU# which handles dump */
    uint32_t nr_cpus;               /* Number of CPUs */
} DiskDumpHeader32;

typedef struct QEMU_PACKED DiskDumpHeader64 {
    char signature[SIG_LEN];        /* = "KDUMP   " */
    uint32_t header_version;        /* Dump header version */
    NewUtsname utsname;             /* copy of system_utsname */
    char timestamp[22];             /* Time stamp */
    uint32_t status;                /* Above flags */
    uint32_t block_size;            /* Size of a block in byte */
    uint32_t sub_hdr_size;          /* Size of arch dependent header in block */
    uint32_t bitmap_blocks;         /* Size of Memory bitmap in block */
    uint32_t max_mapnr;             /* = max_mapnr,
                                       obsoleted in header_version 6 */
    uint32_t total_ram_blocks;      /* Number of blocks should be written */
    uint32_t device_blocks;         /* Number of total blocks in dump device */
    uint32_t written_blocks;        /* Number of written blocks */
    uint32_t current_cpu;           /* CPU# which handles dump */
    uint32_t nr_cpus;               /* Number of CPUs */
} DiskDumpHeader64;

typedef struct QEMU_PACKED KdumpSubHeader32 {
    uint32_t phys_base;
    uint32_t dump_level;            /* header_version 1 and later */
    uint32_t split;                 /* header_version 2 and later */
    uint32_t start_pfn;             /* header_version 2 and later,
                                       obsoleted in header_version 6 */
    uint32_t end_pfn;               /* header_version 2 and later,
                                       obsoleted in header_version 6 */
    uint64_t offset_vmcoreinfo;     /* header_version 3 and later */
    uint32_t size_vmcoreinfo;       /* header_version 3 and later */
    uint64_t offset_note;           /* header_version 4 and later */
    uint32_t note_size;             /* header_version 4 and later */
    uint64_t offset_eraseinfo;      /* header_version 5 and later */
    uint32_t size_eraseinfo;        /* header_version 5 and later */
    uint64_t start_pfn_64;          /* header_version 6 and later */
    uint64_t end_pfn_64;            /* header_version 6 and later */
    uint64_t max_mapnr_64;          /* header_version 6 and later */
} KdumpSubHeader32;

typedef struct QEMU_PACKED KdumpSubHeader64 {
    uint64_t phys_base;
    uint32_t dump_level;            /* header_version 1 and later */
    uint32_t split;                 /* header_version 2 and later */
    uint64_t start_pfn;             /* header_version 2 and later,
                                       obsoleted in header_version 6 */
    uint64_t end_pfn;               /* header_version 2 and later,
                                       obsoleted in header_version 6 */
    uint64_t offset_vmcoreinfo;     /* header_version 3 and later */
    uint64_t size_vmcoreinfo;       /* header_version 3 and later */
    uint64_t offset_note;           /* header_version 4 and later */
    uint64_t note_size;             /* header_version 4 and later */
    uint64_t offset_eraseinfo;      /* header_version 5 and later */
    uint64_t size_eraseinfo;        /* header_version 5 and later */
    uint64_t start_pfn_64;          /* header_version 6 and later */
    uint64_t end_pfn_64;            /* header_version 6 and later */
    uint64_t max_mapnr_64;          /* header_version 6 and later */
} KdumpSubHeader64;

typedef struct DataCache {
    DumpState *state;   /* dump state related to this data */
    uint8_t *buf;       /* buffer for cached data */
    size_t buf_size;    /* size of the buf */
    size_t data_size;   /* size of cached data in buf */
    off_t offset;       /* offset of the file */
} DataCache;

typedef struct QEMU_PACKED PageDescriptor {
    uint64_t offset;                /* the offset of the page data*/
    uint32_t size;                  /* the size of this dump page */
    uint32_t flags;                 /* flags */
    uint64_t page_flags;            /* page flags */
} PageDescriptor;

typedef struct DumpState {
    GuestPhysBlockList guest_phys_blocks;
    ArchDumpInfo dump_info;
    MemoryMappingList list;
    bool resume;
    bool detached;
    bool kdump_raw;
    hwaddr memory_offset;
    int fd;

    /*
     * Dump filter area variables
     *
     * A filtered dump only contains the guest memory designated by
     * the start address and length variables defined below.
     *
     * If length is 0, no filtering is applied.
     */
    int64_t filter_area_begin;  /* Start address of partial guest memory area */
    int64_t filter_area_length; /* Length of partial guest memory area */

    /* Elf dump related data */
    uint32_t phdr_num;
    uint32_t shdr_num;
    ssize_t note_size;
    hwaddr shdr_offset;
    hwaddr phdr_offset;
    hwaddr section_offset;
    hwaddr note_offset;

    void *elf_section_hdrs;     /* Pointer to section header buffer */
    void *elf_section_data;     /* Pointer to section data buffer */
    uint64_t elf_section_data_size; /* Size of section data */
    GArray *string_table_buf;   /* String table data buffer */

    uint8_t *note_buf;          /* buffer for notes */
    size_t note_buf_offset;     /* the writing place in note_buf */
    uint32_t nr_cpus;           /* number of guest's cpu */
    uint64_t max_mapnr;         /* the biggest guest's phys-mem's number */
    size_t len_dump_bitmap;     /* the size of the place used to store
                                   dump_bitmap in vmcore */
    off_t offset_dump_bitmap;   /* offset of dump_bitmap part in vmcore */
    off_t offset_page;          /* offset of page part in vmcore */
    size_t num_dumpable;        /* number of page that can be dumped */
    uint32_t flag_compress;     /* indicate the compression format */
    DumpStatus status;          /* current dump status */

    bool has_format;              /* whether format is provided */
    DumpGuestMemoryFormat format; /* valid only if has_format == true */
    QemuThread dump_thread;       /* thread for detached dump */

    int64_t total_size;          /* total memory size (in bytes) to
                                  * be dumped. When filter is
                                  * enabled, this will only count
                                  * those to be written. */
    int64_t written_size;        /* written memory size (in bytes),
                                  * this could be used to calculate
                                  * how much work we have
                                  * finished. */
    uint8_t *guest_note;         /* ELF note content */
    size_t guest_note_size;
} DumpState;

uint16_t cpu_to_dump16(DumpState *s, uint16_t val);
uint32_t cpu_to_dump32(DumpState *s, uint32_t val);
uint64_t cpu_to_dump64(DumpState *s, uint64_t val);

int64_t dump_filtered_memblock_size(GuestPhysBlock *block, int64_t filter_area_start,
                                    int64_t filter_area_length);
int64_t dump_filtered_memblock_start(GuestPhysBlock *block, int64_t filter_area_start,
                                     int64_t filter_area_length);
#endif