How to open Internet access to a KVM virtual machine in Windows?

Question

System administration

Transferred a virtual machine from VMWare (vmdk) to KVM (qcow2). When the machine was in VMWare format, there were no issues with Internet access, everything worked, because. VMWare Workstations can bridge with a physical network card.
How to provide Internet access for a KVM virtual machine? I run it on Windows .
I start the virtual machine from the command line with the following parameters:

qemu-system-x86_64 -name ubuntu -machine type=pc \
-drive file=vm.qcow2,index=0,media=disk,format=qcow2,if=virtio \
-m 1G,maxmem=2G,slots=1 -vga virtio -boot menu=on -rtc base=localtime,clock=host \
-net nic,model=virtio

I tried to specify -net bridge,br=br0 in the launch options , but it says that this is not possible.
Help, please, to understand. Thank you!

Answer 1

So the bridge must first be bridged at the Linux level.

Answer 2

https://blog.n1mda.ru/linux/proxmox-nastpoyka-seti.html