RE: Save qemu state

[Leek, Jim]

So, why doesn't QEMU support external checkpoints?  (ie an option where 
checkpoints each get written to a new file.)

-----Original Message-----
From: Qemu-discuss <qemu-discuss-bounces+leek2=llnl.gov@nongnu.org> On Behalf 
Of Peter Maydell
Sent: Wednesday, December 1, 2021 9:11 AM
To: Динар Талибуллин <dinartal@gmail.com>
Cc: qemu-discuss@nongnu.org
Subject: Re: Save qemu state

On Wed, 1 Dec 2021 at 14:14, Динар Талибуллин <dinartal@gmail.com> wrote:
>
> Hello. Is it possible to save qemu state if image is in *. elf format?
> I tried to do it in qemu monitor, but it require qcow2 format

You need QEMU to know about one disk which is in qcow2 format, so it can save 
the state there, but that disk doesn't actually have to be attached to the 
emulated machine. This blog post has a note on how to do that:
https://urldefense.us/v3/__https://translatedcode.wordpress.com/2015/07/06/tricks-for-debugging-qemu-savevm-snapshots/__;!!G2kpM7uM-TzIFchu!m3xbK4CoKKh7PSXBOyAvLwSMVOMcUtGC2p2XsSROlweyhgOgW7Y9Eigo-wp7yaw$
(look for the bit starting "If the QEMU system you’re trying to debug doesn’t 
have a disk image at all".)

-- PMM