Gregory Haskins wrote:
>>>> On Wed, Apr 4, 2007 at 4:32 PM, in message <[EMAIL PROTECTED]>,
>>>>
> Ingo Molnar <[EMAIL PROTECTED]> wrote:
>
>>> My current thoughts are that we at least move the IOAPIC into the
>>> kernel as well. [...]
>>>
>> yes. And then do the final 10% move of handling the i8529A in KVM too.
>>
>
> Hi Ingo,
> We are in full agreement on this point, and has been my preferred model
> from the beginning. The only issue with this approach is that it requires a
> fairly disruptive patch to QEMUs "pic_set_irq()" feature which many people
> have drawn exception to so far. (In case you weren't following from the
> beginning, its the "QEMU PIC indirection patch...." thread).
>
You can hack it with if (use_kvm) { ... } (or, more likely,
use_kvm_platform_/
> If we dont care about supporting "--no-kvm" anymore, this problem becomes
> trivially easy.....we can just link in a different pic module into QEMU and
> be done with it. The problem as I see it is that we really have a lot of
> value in being able to switch between kvm and pure qemu mode via --no-kvm,
> especially for debugging. Therefore, IMHO we need to be able to dynamically
> switch between PIC emulation code.
>
>
-no-kvm is critical, it's an important debugging tool. Also keeping
emulation in qemu is important for <= 2.6.21 (or maybe 22) users, which
will not have the in-kernel platform devices.
> If we *do* want to go with this model, *and* we decide that the approach I
> have taken with QEMU is a reasonable way to do it, then I would suggest we go
> about it by getting the patch accepted in QEMU upstream. I would gladly take
> on this duty if we all agree this is the right approach.
>
I think getting the patch in is beneficial. Perhaps after re-review in
light of all the discussion.
--
Do not meddle in the internals of kernels, for they are subtle and quick to
panic.
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