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introduce a new monitor command 'dump-guest-memory' to dump guest's memory

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The command's usage:
   dump-guest-memory [-p] protocol [begin] [length]
The supported protocol can be file or fd:
1. file: the protocol starts with "file:", and the following string is
   the file's path.
2. fd: the protocol starts with "fd:", and the following string is the
   fd's name.

Note:
  1. If you want to use gdb to process the core, please specify -p option.
     The reason why the -p option is not default is:
       a. guest machine in a catastrophic state can have corrupted memory,
          which we cannot trust.
       b. The guest machine can be in read-mode even if paging is enabled.
          For example: the guest machine uses ACPI to sleep, and ACPI sleep
          state goes in real-mode.
  2. If you don't want to dump all guest's memory, please specify the start
     physical address and the length.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
This commit is contained in:
Wen Congyang 2012-05-07 12:10:47 +08:00 • committed by Luiz Capitulino
parent 68f4730c71
commit 783e9b4826
10 changed files with 1050 additions and 0 deletions
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28
hmp-commands.hx
View file

@ -878,6 +878,34 @@ server will ask the spice/vnc client to automatically reconnect using the
new parameters (if specified) once the vm migration finished successfully.
ETEXI
#if defined(CONFIG_HAVE_CORE_DUMP)
{
.name = "dump-guest-memory",
.args_type = "paging:-p,protocol:s,begin:i?,length:i?",
.params = "[-p] protocol [begin] [length]",
.help = "dump guest memory to file"
"\n\t\t\t begin(optional): the starting physical address"
"\n\t\t\t length(optional): the memory size, in bytes",
.user_print = monitor_user_noop,
.mhandler.cmd = hmp_dump_guest_memory,
},
STEXI
@item dump-guest-memory [-p] @var{protocol} @var{begin} @var{length}
@findex dump-guest-memory
Dump guest memory to @var{protocol}. The file can be processed with crash or
gdb.
protocol: destination file(started with "file:") or destination file
descriptor (started with "fd:")
paging: do paging to get guest's memory mapping
begin: the starting physical address. It's optional, and should be
specified with length together.
length: the memory size, in bytes. It's optional, and should be specified
with begin together.
ETEXI
#endif
{
.name = "snapshot_blkdev",
.args_type = "reuse:-n,device:B,snapshot-file:s?,format:s?",