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xen-devel
Re: [Xen-devel] PV drivers for HVM guests
>>> On Wed, Oct 4, 2006 at 3:56 AM, in message
<C14927CD.2084%Keir.Fraser@xxxxxxxxxxxx>, Keir Fraser
<Keir.Fraser@xxxxxxxxxxxx> wrote:
> On 3/10/06 9:31 pm, "Ky Srinivasan" <ksrinivasan@xxxxxxxxxx> wrote:
>
>> These differences can be dealt with in a couple of different ways:
>> 1) Modify the code in the PV drivers under appropriate compilation switches
> to
>> deal with the differences in the base kernels.
>> 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 and would like to
>> get your input on your preference. I personally like option 2. Going
> forward,
>> the evolution of PV drivers needs to be constrained by the required support
>> for legacy Linux environments.
>
> A shim layer (i.e., a set of compat macros) that avoids ifdef'ing the core
> driver code is definitely the way to go.
>
> -- Keir
Thanks Kier; this is also my preference. To keep the shim layer small, we may
still have some ifdefs in the driver code though(to deal with non-existent
header files that are included etc).
Regards,
K. Y
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