Xen devel - Dec 2011 - [help] QEMUFile's format

Hi,
     Is anyone clear about the format of qemu file for savevm or loadvm?
     
 bruce

Do you mean the file format? qcow2, qed, raw? Or the content layout in 
the file image?
On 2011-12-23 13:17, ¤終於aware wrote:
> Hi,
> Is anyone clear about the format of qemu file for savevm or loadvm?
> bruce

-- 
Shu Ming<shuming@linux.vnet.ibm.com>
IBM China Systems and Technology Laboratory

On Fri, Dec 23, 2011 at 01:17:00PM +0800, ¤終於aware
wrote:
>      Is anyone clear about the format of qemu file for savevm or loadvm?
If you are interested in the serialized device state format (e.g. the
e1000 NIC''s serialized state) then the answer is no.  I''m not
aware of
any specification or schema that documents the device state.

It has been known to change in the past and writing tools that depend on
a specific device state layout outside of qemu.git is not viable today
because you''ll have to watch qemu.git hw/ code changes and update your
external code every time something changes.  It seems like a bad idea to
duplicate the device state layout outside of qemu.git.

For a temporary hack, read the QEMUFile and hw/ save/load code.  You can
try qemu-io -c "read -b 0 $length" to extract the vmstate from a qcow2
image file.

Stefan