Restoring QEMU+KVM snapshot on QEMU-only instance

[Georgios Tziantzioulis]

Hi Everyone,

    I am trying to collect some custom execution traces and I am having 
some difficult with the snapshot/checkpoint infrastructure of QEMU.

Specifically, my goal is to use QEMU+KVM to bring up my system to an 
initial state and then take a snapshot of it (using savevm), following I 
want to restore the snapshot (using loadvm) on a QEMU-only instance  -- 
that is KVM is disabled/not-enabled -- to perform the trace collection.

So far I have not been successful on restoring a QEMU+KVM snapshot on a 
QEMU-only instance. After loading the snapshot I do not see any progress 
or response on the guest terminal (info status reports 'VM status: 
running').


I have tried using a number of -cpu model with no success.

I am using virtio and a qcow2 image.

The operating system of the guest is Ubuntu 18.04.

I am using a recent upstream version of qemu (commit: 
175198ad91d8bac540159705873b4ffe4fb94eab; Fri Jun 5, 2020)


Has anyone tried something similar with success. Can someone point me to 
the right direction on how to solve this issue?



Thank you in advance.

Best,

Georgios