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xen-devel
Re: [Xen-devel] To use xcs or not?
Anthony Liguori wrote:
Jacob Gorm Hansen wrote:
I am creating a graphics system where each VM draws into an OpenGL
surface of a process running in dom0. I need to syncronize updates,
ideally with the vertical blanking of the screen, but in the world of
stupid PC hardware probably just with some refresh timer that my
OpenGL process is tied to.
Neat, is this some sort of specialized application or are you
implementing a virtual frame buffer?
This is a specialized app for a research project, and the way I store
pixels means I will not be compatible with applications using the kernel
frame buffer, at least not initially. Hopefully my approach will so much
better that people will dump X and recode their toolkits to run on my
stuff though ;-) It will probably be a little while before this is at a
level where it is usable to anyone else than me, but right now I do have
some cool demos running.
So when the screen has been redrawn, I need to wake up my domUs, and
for this I wanted to use the ctrl_if mechanism. I borrowed some code
from vm-shutdown in the (very nice) vm-tools package, setup a
semaphore in the guest kernel, and for every screen update I send an
XCS_REQUEST (only type that seems to do anything) up to the domU.
This is probably a little overkill. If all you need is notification,
you probably just want to setup your own evtchn.
OK, I actually got the impression that using XCS was the easiest way
around the problem, as you seem to need a lot of code for setting up
your own channel (which I can copy-paste from somewhere I am sure).
Can I setup my own event channel in the guest, and still access it using
/dev/evtchn in dom0?
Thanks,
Jacob
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