How to send/upload a file from Host OS to guest OS in KVM?(not folder sharing)

Just hit upon two different ways:

Transfer files via network. For example you can run httpd on the host and use any web browser or wget/curl to download files. Probably most easy and handy.
Build ISO image on the host with files you want to transfer. Then attach it to the guest's CD drive.
```
genisoimage -o image.iso -r /path/to/dir
virsh attach-disk guest image.iso hdc --driver file --type cdrom --mode readonly
```
- You can use mkisofs instead of genisoimage.
- You can use GUI like virt-manager instead of virsh CUI to attach an ISO image to the guest.
- You need to create a VM beforehand, supply that VM's ID as guest. You can see existing VMs by virsh list --all.

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