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Re: using qemu with macvtap inside a container

From: Roman Dodin
Subject: Re: using qemu with macvtap inside a container
Date: Mon, 18 Jan 2021 17:52:53 +0100

Forgot to mention the versions I run:
qemu: 2.8 and 5.2
kernel: 5.4.89

On Mon, Jan 18, 2021 at 5:44 PM Roman Dodin <dodin.roman@gmail.com> wrote:
Hello qemu users,
I am failing to make a qemu process running inside a docker container to make use of a macvtap device.

Here is the diagram of a setup that I have
My goal is to make qemu process running inside the container to use macvtap1 interface that is configured.

The macvtap1 interface that I have, is using the underlying /dev/tap2 interface. That I deducted by checking ifindex (2) of macvtap1 interface

I tried multiple approaches.
1) to open the device, obtain its fd and pass fd to the qemu:
-device e1000,netdev=p01,mac=9a:d2:fc:3b:d9:71,bus=pci.1,addr=0x2 -netdev tap,id=p01,fd=3

2) referring to "tap2" in ifname of netdev section:
-netdev tap,id=p01,ifname=tap2

None of those approaches worked. By "none of them" worked I mean that I don't see any packets when I sniff on "macvtap1" interface when I do a ping from the VM that is launched with qemu.

I appreciate any pointers or suggestions in further troubleshooting.

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