Re: [Xen-devel] paravirt driver development

[Simon Martin <furryfuttock@xxxxxxxxx>]

Hi Carl,

I've been doing the same thing for a month or so now. Here are a few references:

1.- There's a good book you can get: "The Definitive Guide to the Xen Hypervisor" by David Chisnall. It's a bit dated but lots of good info. The real problem with it is that the examples are 32 bit, whereas I need 64 bit. But such is life.

2.- There is the mini-os in the Xen source. This is a little paravirtual guest. For my purposes (an embedded flat memory OS) this was overkill. 

3.- The killer resource is this mail list. Lots of very helpful, very knowledgeable people.

Based on these three references (lots of number 3) I have written the starting point for a micro-pv. You can get this here https://github.com/FurryFuttock/micro-pv . This creates a stub that is sufficient for Xen to recognize the executable as a guest. It gives you access to the console. Currently I am implementing stack switching to enable simple preemptive multitasking. There is still a bit of cleanup required in some of the header files as I just copy pasted from mini-os without really worrying about or understanding what the macros and functions were doing. One of these days I'll go back and clean up.

As always, all feedback is good!

Regards and good luck.


 

Sunday, December 15, 2013, 2:49:48 PM, you wrote:

Hi xen-devel, I am currently developing an experimental operating system, and I would like to target Xen paravirtualization as a first "hardware" target. I googled a bit and I can't seem to find specifications or a manual for driver authorship targeting paravirt. Is there such a resource? For now all I need to know is how to handle I/O done with a keyboard and console (TTY). Best regards, Carl Patenaude Poulin McGill University

-- 
Best regards,
 Simon                            mailto:furryfuttock@xxxxxxxxx


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