Re: [kvm-devel] Using VMChannel to communicate with the host.

[Dor L. <dor...@gm...>]

Cam Macdonell wrote:
>
> Dor Laor wrote:
> > I just tested it, it got a little deprecated over time since it call
> > pci_module_init instead of pci_register_* and some more irq function
> > deprecation.The sysfs interface in not complete and you can't read/write
> > from the device.
> > The qemu parameters are -vmchannel di:2258,unix:/tmp/file,server
> > 2258 is the vendor id for the device, you can use unix sockets ot even
> > tcp for the host end.
> >
>
> Hi Dor,
>
> Thanks, that got it up and running.  But in the hypercall.c code (from
> the git repo) there is a "hello host" message that looks like it should
> be written to the host.  How do I trigger that to be sent so my very
> simple "listening" program can read it?
>
> Thanks,
> Cam
>
You need to open the unix socket you passed to the vmchannel parameter.
An easier alternative is to use -vmchannel di:2258,tcp://0:4444,server.
Before the guest loads you'll need to telnet the 4444 port and then you 
should receive the
hello world output once the driver is up.
-Dor