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HMP: support specifying dump format for dump-guest-memory

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Dumping guest memory is available to specify the dump format now. This patch
adds options '-z|-l|-s' to HMP command dump-guest-memory to specify dumping in
kdump-compression format, with zlib/lzo/snappy compression. And without these
options ELF format will be used.

The discussion about this feature is here:

http://lists.nongnu.org/archive/html/qemu-devel/2014-03/msg04235.html

Signed-off-by: Qiao Nuohan <qiaonuohan@cn.fujitsu.com>
Suggested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com> (on s390x/kvm)
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
This commit is contained in:
Qiao Nuohan 2014-04-17 16:15:07 +08:00 • committed by Luiz Capitulino
parent c20499d985
commit 1b7a0f758b
2 changed files with 32 additions and 6 deletions
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13
hmp-commands.hx
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@ -1000,10 +1000,13 @@ ETEXI
{
.name = "dump-guest-memory",
.args_type = "paging:-p,filename:F,begin:i?,length:i?",
.params = "[-p] filename [begin length]",
.args_type = "paging:-p,zlib:-z,lzo:-l,snappy:-s,filename:F,begin:i?,length:i?",
.params = "[-p] [-z|-l|-s] filename [begin length]",
.help = "dump guest memory into file 'filename'.\n\t\t\t"
"-p: do paging to get guest's memory mapping.\n\t\t\t"
"-z: dump in kdump-compressed format, with zlib compression.\n\t\t\t"
"-l: dump in kdump-compressed format, with lzo compression.\n\t\t\t"
"-s: dump in kdump-compressed format, with snappy compression.\n\t\t\t"
"begin: the starting physical address.\n\t\t\t"
"length: the memory size, in bytes.",
.mhandler.cmd = hmp_dump_guest_memory,
@ -1012,10 +1015,14 @@ ETEXI
STEXI
@item dump-guest-memory [-p] @var{filename} @var{begin} @var{length}
@item dump-guest-memory [-z|-l|-s] @var{filename}
@findex dump-guest-memory
Dump guest memory to @var{protocol}. The file can be processed with crash or
gdb.
gdb. Without -z|-l|-s, the dump format is ELF.
-p: do paging to get guest's memory mapping.
-z: dump in kdump-compressed format, with zlib compression.
-l: dump in kdump-compressed format, with lzo compression.
-s: dump in kdump-compressed format, with snappy compression.
filename: dump file name.
begin: the starting physical address. It's optional, and should be
specified together with length.