[uml-user] UML <-> host communication

[Ricardo N. <ric...@gm...>]

Hi. I'm trying to create a 2 way communication channel between a kernel
driver in UML with a process at the host.

What's the best way to do it? I started by trying to create a pipe ath the
host, share in hostfs but I can't get any communication (write on pipe in
UML, nothing appears in host).

Plus, I'm using os_open_file kind of functions (shared/os.h) but it always
return me error -2 (bad file path). I thought that it could be because the
kernel module was loaded before the hostfs is mounted but the same error
happens if I insmod it after boot.

What are the alternatives here? I wanted a low latency type of
communication, minimum overhead since it will be a lot of communications os
5-10 bytes each time.

Thanks