Re: [Qemu-devel] [PATCH uq/master] kvm: Drop unused kvm_pit_in_kernel

[Jan Kiszka]

On 2012-03-22 08:18, Gleb Natapov wrote:
> On Wed, Mar 21, 2012 at 02:49:09PM +0100, Jan Kiszka wrote:
>> On 2012-03-21 14:41, Gleb Natapov wrote:
>>> On Wed, Mar 21, 2012 at 02:39:47PM +0100, Jan Kiszka wrote:
>>>> On 2012-03-21 14:36, Avi Kivity wrote:
>>>>> On 03/21/2012 02:36 PM, Jan Kiszka wrote:
>>>>>> This is now implied by kvm_irqchip_in_kernel.
>>>>>>
>>>>>>
>>>>>
>>>>> So we can't have -no-kvm-pit?
>>>>>
>>>>> No huge loss, but unexpected.
>>>>
>>>> See e81dda195556e72f8cd294998296c1051aab30a8.
>>>>
>>> I am curious what is the reason for upstream to not supporting disabling the
>>> in-kernel PIT separately?
>>
>> It was considered no longer relevant:
>> http://thread.gmane.org/gmane.comp.emulators.kvm.devel/85393
>>
> Hmm, may be we should think about this some more. If in the (not so far)
> future we want to drop pit emulation from the kernel we may want to support
> -no-kvm-pit to allow migration from old kernels to new one.

That's not an issue. Both device models are compatible, and you can
migrate between kernel_irqchip=on/off theses days with QEMU.

Jan

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