[Qemu-devel] Re: Breakage with local APIC routing

[Jan Kiszka <jan.kiszka@web.de>]

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Johannes Schindelin wrote:
> Hi,
> 
> On Wed, 13 Aug 2008, Jan Kiszka wrote:
> 
>> Johannes Schindelin wrote:
>>> due to the change in revision 3371 (well, at that time, CVS was used, 
>>> which was no better than Subversion) installation of win64 is broken 
>>> in QEmu.  The commit message reads like this:
>>>
>>> 	Don't route PIC interrupts through the local APIC if the local 
>>> 	APIC config says so. By Ari Kivity.
>> I recalled some earlier post on this which claimed to fix the issue and 
>> found it in the archive:
>>
>> http://permalink.gmane.org/gmane.comp.emulators.qemu/25415
> 
> I tried this, and it changes the symptoms, indeed.  Instead of an endless 
> loop, it results in a bluescreen.
> 
> As the OP said that it worked for him, I guess it is either in commits 
> that came after his post, or in my add-on patches.

So we are likely on the wrong path. Maybe we have to understand what
happens here first...

> 
> Hopefully I will find some time to work more on this bug.

Would be interesting to know
 - if pic_irq_request is continuously called or if it stops when windows
   hangs
 - what IRQ vectors are delivered
 - in what state the apic is, namely the s->lvt[APIC_LVT_LINT0]

Let me know if you can run some instrumentation patches.

Thanks,
Jan


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