how to use exec:cat > /dev/null using libvirt

[Jiatong Shen]

Hello community,

   I am trying to inspect a migration failure using the steps described
here (
https://wiki.qemu.org/Features/Migration/Troubleshooting#:~:text=on%20graphics%20emulation.-,load%20of%20migration%20failed%3A%20Input%2Foutput%20error,are%20a%20few%20failure%20cases.&text=Something%20kills%2Fcancels%20the%20migration,killed%20before%20migration%20is%20complete.&text=A%20migration%20failure%20on%20the%20source.).
In the fourth step, it suggests using migrate 'exec:cat > /dev/null' to try
dumping vm state on the source node. Since the virtual machine is
controlled by libvirt, I suppose I could using the following command,

virsh qemu-monitor-command --hmp <instance-id> 'migrate "exec:cat >
/dev/nulll"

but it failed with 2023-02-24T02:56:07.347307Z qemu-system-x86_64: Unable
to write to command: Broken pipe

So my question is how to use this command using libvirt? Thank you very
much for the help.
-- 

Best Regards,

Jiatong Shen
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