Re: [PATCH] conf: allow --fd 0

On Mon, 28 Apr 2025 14:36:02 +0200 Stefano Brivio wrote:

On Sat, 26 Apr 2025 10:44:25 +0200 Alyssa Ross wrote:

...

inetd-style socket passing traditionally starts a service with a connected socket on file descriptors 0 and 1. passt disallowing obtaining its socket from either of these descriptors made it difficult to use with super-servers providing this interface — in my case I wanted to use passt with s6-ipcserver[1].

Hah, interesting usage, first report I've seen with s6. Is that to dispatch passt processes for a network / set of guests or something?

Never mind, I just found: https://spectrum-os.org/git/spectrum/commit/?id=aac74f6165740a6b041a7205ec86... and related commits. I'm glad to see passt being useful there! By the way, if it helps: - you can actually use QEMU with e1000e and passt, it's somewhat slower than virtio-net (especially with vhost-user), about 1-2 Gbps in my experience, but perfectly usable. For a command line example, see: https://bugs.passt.top/show_bug.cgi?id=107#c0 - libkrun, which is somewhat similar to / shares some code with Cloud Hypervisor, also uses passt, like this: https://github.com/containers/libkrun/blob/main/src/devices/src/virtio/net/p... ...that's without vhost-user support, so far. I had no idea you got Cloud Hypervisor and crosvm to use passt *with* vhost-user supprt, though. That looks like one step further :) - muvm, which uses libkrun to run arbitrary commands in micro VMs (it has conceptually a couple of things in common with Qubes and Spectrum I guess), uses passt's NDP responder and DHCP server to configure its guest network: https://github.com/AsahiLinux/muvm/blob/dc874d4e6c261624b7c6cc9aab151d4d33d4... -- Stefano