How to set up an OpenWRT VM in Proxmox

openwrt-on-proxmox.md

1. Go to OpenWRT release page, select the latest release stable release, then targets -> x86 -> 64. Right-click generic-ext4-combined.img.gz (not the "efi"!) and copy the link.

2. On the Proxmox host, download the archive and unpack it:

wget *paste link here*
gunzip openwrt-*.img.gz

3. Resize the image to be the size you want your VM's disk to be (example with 8 GiB):

qemu-img resize -f raw openwrt-*.img 8G

4. Create a new VM in Proxmox. Make sure to use:

• No installation media
• SeaBIOS
• No drives

Do not start the VM yet.

5. Import the resized OpenWRT image into the new VM:

qm importdisk *VMID* openwrt-*.img *STORAGEID*

6. Go to the VM -> Hardware, select the newly imported disk named "Unused Disk 0", press "Edit", set it to VirtIO with "Discard" and "IO Thread" enabled, then press OK.

7. Add whatever networking or other devices you need.

8. You're done! Start the VM and enjoy all the routing.

Thanks for this install guide!
I do have one thing to add:
After finishing the VM by editing the "unused Disk 0" and adding networking devices I needed to add the new disk to the boot order. Until I did this the VM would not boot since the newly added disk was not selected as a possible boot device.
Do this by clicking on the VM, then click on "Options". Then edit the boot order.

if passthrough PCIe, can check cat /proc/interrupts in host machine CLI. thx guys for saving my day.