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dump: make kdump-compressed format available for 'dump-guest-memory'

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Make monitor command 'dump-guest-memory' be able to dump in kdump-compressed
format. The command's usage:

  dump [-p] protocol [begin] [length] [format]

'format' is used to specified the format of vmcore and can be:
1. 'elf': ELF format, without compression
2. 'kdump-zlib': kdump-compressed format, with zlib-compressed
3. 'kdump-lzo': kdump-compressed format, with lzo-compressed
4. 'kdump-snappy': kdump-compressed format, with snappy-compressed
Without 'format' being set, it is same as 'elf'. And if non-elf format is
specified, paging and filter is not allowed.

Note:
  1. The kdump-compressed format is readable only with the crash utility and
     makedumpfile, and it can be smaller than the ELF format because of the
     compression support.
  2. The kdump-compressed format is the 6th edition.

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 2014-02-18 14:11:36 +08:00 • committed by Luiz Capitulino
parent d12f57ec66
commit b53ccc30c4
4 changed files with 158 additions and 10 deletions
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5
hmp.c
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@ -1311,8 +1311,11 @@ void hmp_dump_guest_memory(Monitor *mon, const QDict *qdict)
const char *file = qdict_get_str(qdict, "filename");
bool has_begin = qdict_haskey(qdict, "begin");
bool has_length = qdict_haskey(qdict, "length");
/* kdump-compressed format is not supported for HMP */
bool has_format = false;
int64_t begin = 0;
int64_t length = 0;
enum DumpGuestMemoryFormat dump_format = DUMP_GUEST_MEMORY_FORMAT_ELF;
char *prot;
if (has_begin) {
@ -1325,7 +1328,7 @@ void hmp_dump_guest_memory(Monitor *mon, const QDict *qdict)
prot = g_strconcat("file:", file, NULL);
qmp_dump_guest_memory(paging, prot, has_begin, begin, has_length, length,
&errp);
has_format, dump_format, &errp);
hmp_handle_error(mon, &errp);
g_free(prot);
}