[Qemu-devel] Re: [RFC][PATCH] disable special ioapic inti0 routing

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

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Anthony Liguori wrote:
> Jan Kiszka wrote:
>> Anthony Liguori wrote:
>>  
>>> Jan Kiszka wrote:
>>>    
>>>> This patch comes from the kvm tree and fixes the timer IRQ routing for
>>>> me which is broken from the POV of certain Linux guest kernels. As I'm
>>>> not up-to-date with the development around that problematic hunk, I'm
>>>> leaving it to someone more deeply involved to sign this off. But please
>>>> commit some fix.
>>>>         
>>> Are you using an old bios by chance?  The reason this fixes KVM has
>>> nothing to do with QEMU FWIW so if this fixes something for you, it's
>>> just a coincidence.
>>>     
>>
>> My first thought as well, but the binary bios from latest svn made no
>> difference.
>>   
> 
> What linux guests broke?

An old 32-bit customized one. And it turned out that it had, for some
reasons I don't recall anymore, ACPI disabled. So it missed the timer
IRQ pin moving QEMU is doing. At the same time, some very similar kernel
with ACPI enabled boots fine. Think I should delete the former from my
test image...

Sorry for the noise,
Jan


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