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QEMU checkpoint/restore without an image?
From: |
Leek, Jim |
Subject: |
QEMU checkpoint/restore without an image? |
Date: |
Sat, 26 Jun 2021 21:40:31 +0000 |
I'm working with VxWorks, a Real Time Operating System for embedded systems.
They recently added QEMU support, and I've been trying to figure it out. (I'm
fairly new to all these technologies.) I would like to checkpoint and restart
the virtual machine, ie save the RAM and processor state and reload it later
from exactly that point.
I read up on snapshots, but those seem to require a disk image in qcow2 format.
But my simulation has no disk, the program is loaded directly into RAM and run.
Here's my QEMU command:
qemu-system-aarch64 -m 4096M -smp 4 -machnie xlnx-zcu102 -device
loader,file=~/vxworks_21.03/workspace3/QEMU_helloWorld/default/vxWorks,addr=0x00100000
-nographic -monitor telnet:127.0.0.1:35163,server,nowait -serial
telnet:127.0.0.1:39251,server -device
loader,file=~/vxworks_21.03/workspace3/vip_xlnx_zynqmp_smp_64/default/xlnx-zcu102-rev-1.1.dtb,addr=0x0f000000
-device loader,addr=0x000ffffc,data=0xd2a1e000,data-len=4 -device
loader,addr=0x000ffffc,cpu-num=0 -nic user -nic user -nic user -nic
user,id=n0,hostfwd=tcp:127.0.0.1:0-:1534,hostfwd=udp:127.0.0.1:0-:17185
Then I log into the monitor and:
$ telnet 127.0.0.1 35163
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
QEMU 5.2.0 monitor - type 'help' for more information
(qemu) savevm
Error: No block device can accept snapshots
I tried a number of things, like creating an empty disk image, but no luck so
far. I see that libvirt has a "save" command that seems like it might do the
right thing, which makes me think there must be some way to do with just QEMU.
The host is RedHat Linux 8.4 running on an x86 desktop, the guest in this case
is ARM64, although I'd be happy to use x86 as well.
Thanks,
Jim
- QEMU checkpoint/restore without an image?,
Leek, Jim <=