Xen devel - Jul 2008 - information needed for netbsd porting project

I would like to be able to do device driver development on a domU for
devices that the domO doesn''t know about.
Using the sources for 3.1.2, could someone tell me where to look
to find the protocol between dom0 and domU used by Xen to do this?

After that, I will need to implement the PCI front-end and back-end drivers.
Could someone show me some sample code?


                                                           Thanks

Michael Litchard

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The_Definitive_Guide_to_the_Xen_Hypervisor,
this book has a appendix chapter "PV Guest Porting Cheat Sheet" which
is a
recap.
Additionally, the examples of this book maybe will be a good sample.

On Wed, Jul 9, 2008 at 4:05 AM, Michael Litchard <michael@schmong.org>
wrote:
> I would like to be able to do device driver development on a domU for
> devices that the domO doesn''t know about.
> Using the sources for 3.1.2, could someone tell me where to look
> to find the protocol between dom0 and domU used by Xen to do this?
>
> After that, I will need to implement the PCI front-end and back-end
> drivers.
> Could someone show me some sample code?
>
>
>                                                           Thanks
>
> Michael Litchard
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
>


-- 
Best Regards,
-- Lin.Yu


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excellent. I was moving toward buying that book. Now you''ve given
me great reason. Putting in my order now.

On 7/9/08, Lin.Yu@WindRiver.com <yulin724@gmail.com>
wrote:
> The_Definitive_Guide_to_the_Xen_Hypervisor,
> this book has a appendix chapter "PV Guest Porting Cheat Sheet"
which is a
> recap.
> Additionally, the examples of this book maybe will be a good sample.
>
>
>  On Wed, Jul 9, 2008 at 4:05 AM, Michael Litchard
<michael@schmong.org>
> wrote:
> >
> > I would like to be able to do device driver development on a domU for
> > devices that the domO doesn''t know about.
> > Using the sources for 3.1.2, could someone tell me where to look
> > to find the protocol between dom0 and domU used by Xen to do this?
> >
> > After that, I will need to implement the PCI front-end and back-end
> drivers.
> > Could someone show me some sample code?
> >
> >
> >                                                           Thanks
> >
> > Michael Litchard
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@lists.xensource.com
> > http://lists.xensource.com/xen-devel
> >
>
>
>
> --
> Best Regards,
> -- Lin.Yu
>
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> I would like to be able to do device driver development on a domU for
> devices that the domO doesn''t know about.
> Using the sources for 3.1.2, could someone tell me where to look
> to find the protocol between dom0 and domU used by Xen to do this?
>
> After that, I will need to implement the PCI front-end and back-end
> drivers. Could someone show me some sample code?
Take a look in the XenLinux tree, drivers/xen/pci{front,back} and in the Xen 
hypervisor tree, xen/include/public/io/pciif.h

You may also want to look in the tools/ directory in the hypervisor tree to 
see how devices get assigned to a guest in the firstplace.

Most PCI IO can be done directly by a guest once the PCI passthrough is done.  
Config space changes still need to go through dom0, though.

Cheers,
Mark

-- 
Push Me Pull You - Distributed SCM tool (http://www.cl.cam.ac.uk/~maw48/pmpu/)

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On 7/11/08, Mark Williamson <mark.williamson@cl.cam.ac.uk>
wrote:
> > I would like to be able to do device driver development on a domU for
>  > devices that the domO doesn''t know about.
>  > Using the sources for 3.1.2, could someone tell me where to look
>  > to find the protocol between dom0 and domU used by Xen to do this?
>  >
>  > After that, I will need to implement the PCI front-end and back-end
>  > drivers. Could someone show me some sample code?
>
>
> Take a look in the XenLinux tree, drivers/xen/pci{front,back} and in the
Xen
>  hypervisor tree, xen/include/public/io/pciif.h
>
>  You may also want to look in the tools/ directory in the hypervisor tree
to
>  see how devices get assigned to a guest in the firstplace.
Am I looking in the right place?
/usr/local/src/xen-3.1.4/xen/tools

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> > Take a look in the XenLinux tree, drivers/xen/pci{front,back} and in
the
> > Xen hypervisor tree, xen/include/public/io/pciif.h
> >
> >  You may also want to look in the tools/ directory in the hypervisor
tree
> > to see how devices get assigned to a guest in the firstplace.
>
> Am I looking in the right place?
> /usr/local/src/xen-3.1.4/xen/tools
Yes, that''s about right.

Some relevant places to start would be to look at:

tools/python/xen/xend/XendDevices.py
tools/python/xen/xend/server/pciif.py
tools/libxc/xc_domain.c (for the hypercalls to enable PCI access)

and to follow files that call these / that these include or import.

Hope that helps a bit.

Cheers,
Mark

-- 
Push Me Pull You - Distributed SCM tool (http://www.cl.cam.ac.uk/~maw48/pmpu/)

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