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xen-devel
Re: [Xen-devel] What is domain creation flow-chart in XEND
> From what I can tell, Linux always listens on event channel 1. So,
> Xend just binds a local port to the domains port 1. After binding, it
> maps a shared memory region and works on a ring queue passing back and
> forth control_msg_t structures. This is how virtual devices are setup.
>
> I imagine each device gets it's own channel but I do not know for sure.
Every domain has a "control interface" as you described, which is used for low
bandwidth communications (console and various configuration messages).
Amongst other things, the control channel is used to negotiate the locations
of shared memory pages that the network and block drivers can use for
high-bandwidth communications.
> The domain's kernel I believe.
See linux-2.6.10-sparse/arch/xen/kernel/ctrl_if.c and
linux-2.6.10-sparse/include/asm-xen/ctrl_if.h for code relating to the kernel
control interface driver.
> >If someone can point me to some document for more details I would
> > appreciate it
Andy wrote an explanation of how the block device drivers work. It's in
docs/misc/blkif-drivers-explained.txt. You might find some pertinent
information there, particularly when you look at how the drivers talk to each
other.
HTH,
Mark
> I posted some documentation to xc.h. This is where most of this work is
> done. I don't know of any documentation. The bulk of all this is done
> in libxc, xu.c (this binding implements a bunch of functionality), and
> x2d2 (this isn't used by Xend but is a bit easier to understand than Xend).
>
> Regards,
>
> >Thanks
> >
> >Nauzad
> >
> >
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