Xen devel - May 2010 - HOWTO: Patch to arbitrary Linux Kernel to support PV drivers for domU HVM

I have made up a patch for an arbitrary Linux kernel (I''m using
Ubuntu''s Lucid kernel 2.6.32-22) which adds support for PV drivers with
under domU HVM.

Previously, to build pvdrivers for a kernel, you had to xenify it,
build the xenified kernel with CONFIG_XEN switched of, then add the 
unmodified_drivers, then build them. That prevents you building pvdrivers
for any kernel you do not have xenifying patches for.

With this patch, you can build pvdrivers against an arbitrary kernel
(such as a distributor''s kernel). This is useful to me, as I want to
stick with distributor kernels. In essence what I have done is
untangled some (but not all) of the build/header spaghetti from
unmodified_drivers. The source files are about 2 x perl -pi -e
away from what''s in unmodified_drivers plus a xenified kernel, just
in different directories. I''ve also made them build as built-ins.

It''s described in more detail here:
 http://blog.alex.org.uk/archives/23
Patch is here:
 http://www.alex.org.uk/pvdrivers.20100509-1955.patch

The drivers seem to work ok.

-- 
Alex Bligh


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On Sun, May 09, 2010 at 09:14:32PM +0100, Alex Bligh
wrote:
> I have made up a patch for an arbitrary Linux kernel (I''m using
> Ubuntu''s Lucid kernel 2.6.32-22) which adds support for PV drivers
with
> under domU HVM.
>
> Previously, to build pvdrivers for a kernel, you had to xenify it,
> build the xenified kernel with CONFIG_XEN switched of, then add the  
> unmodified_drivers, then build them. That prevents you building pvdrivers
> for any kernel you do not have xenifying patches for.
>
> With this patch, you can build pvdrivers against an arbitrary kernel
> (such as a distributor''s kernel). This is useful to me, as I want
to
> stick with distributor kernels. In essence what I have done is
> untangled some (but not all) of the build/header spaghetti from
> unmodified_drivers. The source files are about 2 x perl -pi -e
> away from what''s in unmodified_drivers plus a xenified kernel,
just
> in different directories. I''ve also made them build as built-ins.
>
> It''s described in more detail here:
> http://blog.alex.org.uk/archives/23
> Patch is here:
> http://www.alex.org.uk/pvdrivers.20100509-1955.patch
>
> The drivers seem to work ok.
>
Great, thanks! 

I''ll update this info to the wiki later today.

-- Pasi


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On Mon, May 10, 2010 at 09:20:27AM +0300, Pasi Kärkkäinen
wrote:
> On Sun, May 09, 2010 at 09:14:32PM +0100, Alex Bligh wrote:
> > I have made up a patch for an arbitrary Linux kernel (I''m
using
> > Ubuntu''s Lucid kernel 2.6.32-22) which adds support for PV
drivers with
> > under domU HVM.
> >
> > Previously, to build pvdrivers for a kernel, you had to xenify it,
> > build the xenified kernel with CONFIG_XEN switched of, then add the  
> > unmodified_drivers, then build them. That prevents you building
pvdrivers
> > for any kernel you do not have xenifying patches for.
> >
> > With this patch, you can build pvdrivers against an arbitrary kernel
> > (such as a distributor''s kernel). This is useful to me, as I
want to
> > stick with distributor kernels. In essence what I have done is
> > untangled some (but not all) of the build/header spaghetti from
> > unmodified_drivers. The source files are about 2 x perl -pi -e
> > away from what''s in unmodified_drivers plus a xenified
kernel, just
> > in different directories. I''ve also made them build as
built-ins.
> >
> > It''s described in more detail here:
> > http://blog.alex.org.uk/archives/23
> > Patch is here:
> > http://www.alex.org.uk/pvdrivers.20100509-1955.patch
> >
> > The drivers seem to work ok.
> >
> 
> Great, thanks! 
> 
> I''ll update this info to the wiki later today.
> 
http://wiki.xensource.com/xenwiki/XenLinuxPVonHVMdrivers

Also added to:
http://wiki.xensource.com/xenwiki/XenCommonProblems

-- Pasi


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