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Re: nvmm users - experience

Hi Robert,

On 23.05.23 15:51, Robert Nestor wrote:

Commenting on your follow-up on Xen startup and how I considered doing this in NVMM.  I have a rudamentory script that I use to define/create guest systems which also includes some hooks for starting up guest systems. There’s not currently any way I found in NVMM to send in shutdown commands or instructions though which seem to be available in Xen and KVM.  I did put hooks in my script to backup and restore guest systems.

Assuming you are using Qemu as the frontend to nvmm you can redirect Qemus "monitor" console to a Unix domain socket.

I use this command in my scripts:


nohup qemu-system-x86_64 -name $VM_ID -machine pc-q35-7.0 -smp $VM_CORES -m $VM_RAM -accel nvmm \
                        -device virtio-balloon-pci,id=balloon0 \
                        -k de -boot cd -cdrom $VM_CDROM \
                        -machine graphics=off -display none -vga none \
-object rng-random,filename=/dev/urandom,id=viornd0 \
                        -device virtio-rng-pci,rng=viornd0 \
                        -object iothread,id=t0 \
                        $BLK \
                        -device virtio-net-pci,netdev=vioif0,mac=$VM_MAC \
-netdev tap,id=vioif0,ifname=$VM_NETIF,script=no,downscript=no \ -chardev socket,id=monitor,path=$MONITOR_SOCKET,server=on,wait=off \
                        -monitor chardev:monitor \
-chardev socket,id=serial0,path=$CONSOLE_SOCKET,server=on,wait=off \
                        -serial chardev:serial0 \
                        -pidfile /tmp/$ \
                        2>&1 | logger -p local0.notice &

Shutdown is possible by sendung the system_powerdown qemu monitor command:

echo "system_powerdown" | nc -N -U $MONITOR_SOCKET
echo ""

On my systems this result in an ACPI poweroff event which triggers the shutdown procedure in the NetBSD guest.

Kind regards

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