From 86459b009f0402a2cdf3ef6a944684b62ac2ea0a Mon Sep 17 00:00:00 2001

From: Laszlo Ersek <lersek@redhat.com>

Date: Fri, 7 Nov 2014 17:17:58 +0100

Subject: [PATCH 11/41] dump: add API to write dump header

Message-id: <1415380693-16593-12-git-send-email-lersek@redhat.com>

Patchwork-id: 62197

O-Subject: [RHEL-7.1 qemu-kvm PATCH 11/26] dump: add API to write dump header

Bugzilla: 1157798

RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>

RH-Acked-by: Luiz Capitulino <lcapitulino@redhat.com>

RH-Acked-by: dgibson <dgibson@redhat.com>

From: qiaonuohan <qiaonuohan@cn.fujitsu.com>

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>

(cherry picked from commit 298f116827405f37dde10a2a6cbc75d20f9ba99c)

Signed-off-by: Laszlo Ersek <lersek@redhat.com>

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>

---

 dump.c                | 223 ++++++++++++++++++++++++++++++++++++++++++++++++++

 include/sysemu/dump.h |  96 ++++++++++++++++++++++

 2 files changed, 319 insertions(+)

diff --git a/dump.c b/dump.c

index 88e8cc0..4d135fd 100644

--- a/dump.c

+++ b/dump.c

@@ -784,6 +784,229 @@ static int buf_write_note(const void *buf, size_t size, void *opaque)

     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;

diff --git a/include/sysemu/dump.h b/include/sysemu/dump.h

index 995bf47..dfee238 100644

--- a/include/sysemu/dump.h

+++ b/include/sysemu/dump.h

@@ -27,6 +27,19 @@

 #define pfn_to_paddr(X, page_shift) \

     (((unsigned long long)(X) + ARCH_PFN_OFFSET) << (page_shift))

+/*

+ * 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 PHYS_BASE                   (0)

+#define DUMP_LEVEL                  (1)

+#define DISKDUMP_HEADER_BLOCKS      (1)

+

 typedef struct ArchDumpInfo {

     int d_machine;  /* Architecture */

     int d_endian;   /* ELFDATA2LSB or ELFDATA2MSB */

@@ -44,6 +57,89 @@ typedef struct QEMU_PACKED MakedumpfileDataHeader {

     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;

+

 struct GuestPhysBlockList; /* memory_mapping.h */

 int cpu_get_dump_info(ArchDumpInfo *info,

                       const struct GuestPhysBlockList *guest_phys_blocks);

-- 

1.8.3.1