Add API to create header, sub header of vmcore in kdump-compressed format.
The data is store in struct DumpState.
The following patch will use this function to gather data of header, then
write them into vmcore.
Signed-off-by: Qiao Nuohan <qiaonuo...@cn.fujitsu.com>
Reviewed-by: Zhang Xiaohe <zhan...@cn.fujitsu.com>
---
dump.c | 107 +++++++++++++++++++++++++++++++++++++++++++++++++
include/sysemu/dump.h | 95 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 202 insertions(+), 0 deletions(-)
diff --git a/dump.c b/dump.c
index 705c978..bdebb33 100644
--- a/dump.c
+++ b/dump.c
@@ -672,6 +672,113 @@ static ram_addr_t get_start_block(DumpState *s)
return -1;
}
+static int create_header32(DumpState *s)
+{
+ struct disk_dump_header32 *dh;
+ struct kdump_sub_header32 *kh;
+
+ /* create common header, the version of kdump-compressed format is 5th */
+ dh = g_malloc0(sizeof(struct disk_dump_header32));
+
+ strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE));
+ dh->header_version = 5;
+ dh->block_size = s->page_size;
+ dh->sub_hdr_size = sizeof(struct kdump_sub_header32) + s->note_size;
+ dh->sub_hdr_size = divideup(dh->sub_hdr_size, dh->block_size);
+ dh->max_mapnr = s->max_mapnr;
+ dh->nr_cpus = s->nr_cpus;
+ dh->bitmap_blocks = divideup(s->len_dump_bitmap, s->page_size);
+
+ memcpy(&(dh->utsname.machine), "i686", 4);
+
+ s->dh = dh;
+
+ /* create sub header */
+ kh = g_malloc0(sizeof(struct kdump_sub_header32));
+
+ kh->phys_base = PHYS_BASE;
+ kh->dump_level = DUMP_LEVEL;
+
+ kh->offset_note = DISKDUMP_HEADER_BLOCKS * dh->block_size +
+ sizeof(struct kdump_sub_header32);
+ kh->note_size = s->note_size;
+
+ s->kh = kh;
+
+ /* get gap between header and sub header */
+ s->offset_sub_header = DISKDUMP_HEADER_BLOCKS * dh->block_size -
+ sizeof(struct disk_dump_header32);
+
+ /* get gap between header and dump_bitmap */
+ s->offset_dump_bitmap = dh->sub_hdr_size * dh->block_size -
+ (sizeof(struct kdump_sub_header32) + s->note_size);
+
+ /* get offset of page desc */
+ s->offset_page = (DISKDUMP_HEADER_BLOCKS + dh->sub_hdr_size +
+ dh->bitmap_blocks) * dh->block_size;
+
+ return 0;
+}
+
+static int create_header64(DumpState *s)
+{
+ struct disk_dump_header64 *dh;
+ struct kdump_sub_header64 *kh;
+
+ /* create common header, the version of kdump-compressed format is 5th */
+ dh = g_malloc0(sizeof(struct disk_dump_header64));
+
+ strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE));
+ dh->header_version = 5;
+ dh->block_size = s->page_size;
+ dh->sub_hdr_size = sizeof(struct kdump_sub_header64) + s->note_size;
+ dh->sub_hdr_size = divideup(dh->sub_hdr_size, dh->block_size);
+ dh->max_mapnr = s->max_mapnr;
+ dh->nr_cpus = s->nr_cpus;
+ dh->bitmap_blocks = divideup(s->len_dump_bitmap, s->page_size);
+
+ memcpy(&(dh->utsname.machine), "x86_64", 6);
+
+ s->dh = dh;
+
+ /* create sub header */
+ kh = g_malloc0(sizeof(struct kdump_sub_header64));
+
+ kh->phys_base = PHYS_BASE;
+ kh->dump_level = DUMP_LEVEL;
+
+ kh->offset_note = DISKDUMP_HEADER_BLOCKS * dh->block_size +
+ sizeof(struct kdump_sub_header64);
+ kh->note_size = s->note_size;
+
+ s->kh = kh;
+
+ /* get gap between header and sub header */
+ s->offset_sub_header = DISKDUMP_HEADER_BLOCKS * dh->block_size -
+ sizeof(struct disk_dump_header64);
+
+ /* get gap between header and dump_bitmap */
+ s->offset_dump_bitmap = dh->sub_hdr_size * dh->block_size -
+ (sizeof(struct kdump_sub_header64) + s->note_size);
+
+ /* get offset of page desc */
+ s->offset_page = (DISKDUMP_HEADER_BLOCKS + dh->sub_hdr_size +
+ dh->bitmap_blocks) * dh->block_size;
+
+ return 0;
+}
+
+/*
+ * gather data of header and sub header
+ */
+static int create_header(DumpState *s)
+{
+ if (s->dump_info.d_machine == EM_386)
+ return create_header32(s);
+ else
+ return create_header64(s);
+}
+
static int dump_init(DumpState *s, int fd, bool paging, bool has_filter,
int64_t begin, int64_t length, Error **errp)
{
diff --git a/include/sysemu/dump.h b/include/sysemu/dump.h
index b41469a..b7846c9 100644
--- a/include/sysemu/dump.h
+++ b/include/sysemu/dump.h
@@ -25,12 +25,95 @@
#include "qapi/error.h"
#include "qmp-commands.h"
+#include <sys/utsname.h>
+
+#define KDUMP_SIGNATURE "KDUMP "
+#define SIG_LEN (sizeof(KDUMP_SIGNATURE) - 1)
+#define DISKDUMP_HEADER_BLOCKS (1)
+#define PHYS_BASE (0)
+#define DUMP_LEVEL (1)
+
+#define divideup(x, y) (((x) + ((y) - 1)) / (y))
+
typedef struct ArchDumpInfo {
int d_machine; /* Architecture */
int d_endian; /* ELFDATA2LSB or ELFDATA2MSB */
int d_class; /* ELFCLASS32 or ELFCLASS64 */
} ArchDumpInfo;
+struct new_utsname {
+ char sysname[65];
+ char nodename[65];
+ char release[65];
+ char version[65];
+ char machine[65];
+ char domainname[65];
+};
+
+struct disk_dump_header32 {
+ char signature[SIG_LEN]; /* = "KDUMP " */
+ int header_version; /* Dump header version */
+ struct new_utsname utsname; /* copy of system_utsname */
+ char timestamp[8]; /* Time stamp */
+ unsigned int status; /* Above flags */
+ int block_size; /* Size of a block in byte */
+ int sub_hdr_size; /* Size of arch dependent header in blocks
*/
+ unsigned int bitmap_blocks; /* Size of Memory bitmap in block */
+ unsigned int max_mapnr; /* = max_mapnr */
+ unsigned int total_ram_blocks; /* Number of blocks should be written */
+ unsigned int device_blocks; /* Number of total blocks in dump device */
+ unsigned int written_blocks; /* Number of written blocks */
+ unsigned int current_cpu; /* CPU# which handles dump */
+ int nr_cpus; /* Number of CPUs */
+ struct task_struct *tasks[0];
+};
+
+struct disk_dump_header64 {
+ char signature[SIG_LEN]; /* = "KDUMP " */
+ int header_version; /* Dump header version */
+ struct new_utsname utsname; /* copy of system_utsname */
+ char timestamp[20]; /* Time stamp */
+ unsigned int status; /* Above flags */
+ int block_size; /* Size of a block in byte */
+ int sub_hdr_size; /* Size of arch dependent header in blocks
*/
+ unsigned int bitmap_blocks; /* Size of Memory bitmap in block */
+ unsigned int max_mapnr; /* = max_mapnr */
+ unsigned int total_ram_blocks; /* Number of blocks should be written */
+ unsigned int device_blocks; /* Number of total blocks in dump device */
+ unsigned int written_blocks; /* Number of written blocks */
+ unsigned int current_cpu; /* CPU# which handles dump */
+ int nr_cpus; /* Number of CPUs */
+ struct task_struct *tasks[0];
+};
+
+struct kdump_sub_header32 {
+ 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 */
+ uint32_t end_pfn; /* header_version 2 and later */
+ uint32_t offset_vmcoreinfo; /* header_version 3 and later */
+ uint32_t size_vmcoreinfo; /* header_version 3 and later */
+ uint32_t offset_note; /* header_version 4 and later */
+ uint32_t note_size; /* header_version 4 and later */
+ uint32_t offset_eraseinfo; /* header_version 5 and later */
+ uint32_t size_eraseinfo; /* header_version 5 and later */
+};
+
+struct kdump_sub_header64 {
+ 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 */
+ uint64_t end_pfn; /* header_version 2 and later */
+ 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 */
+};
+
typedef struct DumpState {
ArchDumpInfo dump_info;
MemoryMappingList list;
@@ -48,6 +131,18 @@ typedef struct DumpState {
int64_t begin;
int64_t length;
Error **errp;
+
+ int page_size;
+ unsigned long long max_mapnr;
+ int nr_cpus;
+ void *dh;
+ void *kh;
+ off_t offset_sub_header;
+
+ off_t offset_dump_bitmap;
+ unsigned long len_dump_bitmap;
+
+ off_t offset_page;
} DumpState;
int cpu_get_dump_info(ArchDumpInfo *info);
--
1.7.1
