Re: PV drivers for HVM guests

["Ky Srinivasan" <ksrinivasan@novell.com>]

Thanks Ian. I am currently testing my implementation on sles9. I will certainly look at how I can leverage your work.

Regards,

K. Y

>>> On Thu, Oct 5, 2006 at 11:21 AM, in message
<1160061687.3755.101.camel@localhost.localdomain>, Ian Campbell
<Ian.Campbell@XenSource.com> wrote: 
> On Tue, 2006- 10- 03 at 16:31 - 0400, Ky Srinivasan wrote:
>> 2)  Introduce  a compatibility component that bridges the gap between
>> the current PV code and a given Linux target and leave much of the PV
>> driver  code untouched.
>> 
>> I have implemented both these schemes for the sles9 kernel 
> 
> FWIW I have a half complete implementation (compile tested only) of such
> a scheme which I've attached, perhaps you can crib something useful from
> it ;- ).
> 
> Basically it adds a compat- include directory to the end of the include
> search path which contains compatibility versions of headers which may
> not present in older kernels and adds compat.h which defines other
> missing bits where necessary.
> 
> It covers most of the issues compiling against a RHEL4 (2.6.9) or SLES9
> (2.6.5) kernel, although compatibility shims for
> schedule_timeout_interruptible() and nonseekable_open() are still
> missing and the versions used for triggering compatibility code are
> certainly totally wrong (just right for RHEL4 and SLES9 though ;- )).
> 
> I'm fairly unhappy about the number of ifdef's in xenbus_probe.c. I
> reckon some function reordering could coalesce a lot of them. Perhaps
> they are candidates for splitting into a separate file.
> 
> This work will also be useful for the fully PV vendor kernel ports which
> is why I'm interested.
> 
> Ian.