Right now I'm just finding for a way to make it work, so slow communications will also be acceptable for now. This is for device emulation, so a lot of memory reads and writes. Better slower then non existent.
If I use a tuntap, a socket or something like that, what API can I use to communicate straight from the kernel to the host? I just tried to implement netpoll sockets <http://stackoverflow.com/a/12175937/538339>, but it doesn't seem to be supported inside UML. 2015-10-12 16:50 GMT+01:00 Balaco Baco <balacob...@imap.cc>: > Interesting idea! :) > > But why not using "real" network connections? If you keep a connection > open, you will have no "big" overhead besides openning it the first time > (or reopenning, if eventually needed). You will be able to choose the > format of each message contents, as desired. And the communication can > be redirected to whatever you need, both in the UML or the host system. > > You wrote about low latency, but gave no estimatives you expect. What > would be it? And what have you discarded using with this constraint? > > -- > Balaco > > > > On Mon, Oct 12, 2015, at 11:46, Ricardo Nunes wrote: > > 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 > > > ------------------------------------------------------------------------------ > > _______________________________________________ > > User-mode-linux-user mailing list > > User-mode-linux-user@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user > > -- > http://www.fastmail.com - Accessible with your email software > or over the web > > > > ------------------------------------------------------------------------------ > _______________________________________________ > User-mode-linux-user mailing list > User-mode-linux-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user >
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