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If you use Virtual Machine Manager, you most likely also have "virsh" tools installed. You can use it to transmit qemu-monitor commands to your VM:

virsh# qemu-monitor-command vm-name --hmp "pmemsave 0 0x20000000 /tmp/dumpfile"

virtualization - How to enable QEMU-Monitor Console in Virtual Machine...

virtual-machine virtualization qemu libvirt