[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PULL 07/22] dump: add API to write header of flatten forma
From: |
Luiz Capitulino |
Subject: |
[Qemu-devel] [PULL 07/22] dump: add API to write header of flatten format |
Date: |
Thu, 13 Feb 2014 10:30:25 -0500 |
From: qiaonuohan <address@hidden>
flatten format will be used when writing kdump-compressed format. The format is
also used by makedumpfile, you can refer to the following URL to get more
detailed information about flatten format of kdump-compressed format:
http://sourceforge.net/projects/makedumpfile/
The two functions here are used to write start flat header and end flat header
to vmcore, and they will be called later when flatten format is used.
struct MakedumpfileHeader stored at the head of vmcore is used to indicate the
vmcore is in flatten format.
struct MakedumpfileHeader {
char signature[16]; /* = "makedumpfile" */
int64_t type; /* = 1 */
int64_t version; /* = 1 */
};
And struct MakedumpfileDataHeader, with offset and buf_size set to -1, is used
to indicate the end of vmcore in flatten format.
struct MakedumpfileDataHeader {
int64_t offset; /* = -1 */
int64_t buf_size; /* = -1 */
};
Signed-off-by: Qiao Nuohan <address@hidden>
Reviewed-by: Laszlo Ersek <address@hidden>
Signed-off-by: Luiz Capitulino <address@hidden>
---
dump.c | 42 ++++++++++++++++++++++++++++++++++++++++++
include/sysemu/dump.h | 17 +++++++++++++++++
2 files changed, 59 insertions(+)
diff --git a/dump.c b/dump.c
index c9d3492..f233b3e 100644
--- a/dump.c
+++ b/dump.c
@@ -686,6 +686,48 @@ static int create_vmcore(DumpState *s)
return 0;
}
+static int write_start_flat_header(int fd)
+{
+ uint8_t *buf;
+ MakedumpfileHeader mh;
+ int ret = 0;
+
+ memset(&mh, 0, sizeof(mh));
+ strncpy(mh.signature, MAKEDUMPFILE_SIGNATURE,
+ strlen(MAKEDUMPFILE_SIGNATURE));
+
+ mh.type = cpu_to_be64(TYPE_FLAT_HEADER);
+ mh.version = cpu_to_be64(VERSION_FLAT_HEADER);
+
+ buf = g_malloc0(MAX_SIZE_MDF_HEADER);
+ memcpy(buf, &mh, sizeof(mh));
+
+ size_t written_size;
+ written_size = qemu_write_full(fd, buf, MAX_SIZE_MDF_HEADER);
+ if (written_size != MAX_SIZE_MDF_HEADER) {
+ ret = -1;
+ }
+
+ g_free(buf);
+ 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 ram_addr_t get_start_block(DumpState *s)
{
GuestPhysBlock *block;
diff --git a/include/sysemu/dump.h b/include/sysemu/dump.h
index 19fafb2..b32b390 100644
--- a/include/sysemu/dump.h
+++ b/include/sysemu/dump.h
@@ -14,12 +14,29 @@
#ifndef DUMP_H
#define DUMP_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)
+
typedef struct ArchDumpInfo {
int d_machine; /* Architecture */
int d_endian; /* ELFDATA2LSB or ELFDATA2MSB */
int d_class; /* ELFCLASS32 or ELFCLASS64 */
} ArchDumpInfo;
+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;
+
struct GuestPhysBlockList; /* memory_mapping.h */
int cpu_get_dump_info(ArchDumpInfo *info,
const struct GuestPhysBlockList *guest_phys_blocks);
--
1.8.1.4
- [Qemu-devel] [PULL 00/22] QMP queue, Luiz Capitulino, 2014/02/13
- [Qemu-devel] [PULL 01/22] hmp: migrate command (without -d) now blocks correctly, Luiz Capitulino, 2014/02/13
- [Qemu-devel] [PULL 02/22] QMP: allow JSON dict arguments in qmp-shell, Luiz Capitulino, 2014/02/13
- [Qemu-devel] [PULL 03/22] Use error_is_set() only when necessary, Luiz Capitulino, 2014/02/13
- [Qemu-devel] [PULL 05/22] dump: const-qualify the buf of WriteCoreDumpFunction, Luiz Capitulino, 2014/02/13
- [Qemu-devel] [PULL 06/22] dump: add argument to write_elfxx_notes, Luiz Capitulino, 2014/02/13
- [Qemu-devel] [PULL 04/22] qmp: expose list of supported character device backends, Luiz Capitulino, 2014/02/13
- [Qemu-devel] [PULL 07/22] dump: add API to write header of flatten format,
Luiz Capitulino <=
- [Qemu-devel] [PULL 09/22] dump: add API to write elf notes to buffer, Luiz Capitulino, 2014/02/13
- [Qemu-devel] [PULL 08/22] dump: add API to write vmcore, Luiz Capitulino, 2014/02/13
- [Qemu-devel] [PULL 10/22] dump: add support for lzo/snappy, Luiz Capitulino, 2014/02/13
- [Qemu-devel] [PULL 11/22] dump: add members to DumpState and init some of them, Luiz Capitulino, 2014/02/13
- [Qemu-devel] [PULL 12/22] dump: add API to write dump header, Luiz Capitulino, 2014/02/13
- [Qemu-devel] [PULL 13/22] dump: add API to write dump_bitmap, Luiz Capitulino, 2014/02/13
- [Qemu-devel] [PULL 14/22] dump: add APIs to operate DataCache, Luiz Capitulino, 2014/02/13
- [Qemu-devel] [PULL 15/22] dump: add API to write dump pages, Luiz Capitulino, 2014/02/13
- [Qemu-devel] [PULL 18/22] dump: add 'query-dump-guest-memory-capability' command, Luiz Capitulino, 2014/02/13
- [Qemu-devel] [PULL 16/22] dump: make kdump-compressed format available for 'dump-guest-memory', Luiz Capitulino, 2014/02/13