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Re: [Qemu-devel] [PATCH v5 07/16] apic: Open-code timer save/restore

From: Jan Kiszka
Subject: Re: [Qemu-devel] [PATCH v5 07/16] apic: Open-code timer save/restore
Date: Tue, 20 Dec 2011 00:45:22 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv: Gecko/20080226 SUSE/ Thunderbird/ Mnenhy/

On 2011-12-19 23:21, Anthony Liguori wrote:
> On 12/15/2011 06:33 AM, Jan Kiszka wrote:
>> To enable migration between accelerated and non-accelerated APIC models,
>> we will need to handle the timer saving and restoring specially and can
>> no longer rely on the automatics of VMSTATE_TIMER. Specifically,
>> accelerated model will not start any QEMUTimer.
>> This patch therefore factors out the generic bits into apic_next_timer
>> and introduces a post-load callback that can be implemented differently
>> by both models.
>> Signed-off-by: Jan Kiszka<address@hidden>
> So you basically want the timer to be a dummy field for the in-kernel apic?
> Can you fix this up in a pre-save routine (put QEMUTimer into a state
> where there isn't an event pending)?

It is not a dummy field, it contains the proper state in both cases. We
just need to convert it to an open-coded state to avoid the QEMUTimer
restoration magic in the in-kernel case (where there must be no QEMUTimer).


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