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Date: Wed, 12 Aug 2009 12:08:53 +0200
From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: Re: [Qemu-devel] virtio-blk/qdev failure in the current git tree
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To: Christoph Hellwig <hch@lst.de>
Cc: qemu-devel@nongnu.org

On 08/12/09 11:26, Gerd Hoffmann wrote:
> On 08/11/09 21:28, Gerd Hoffmann wrote:
>> Hmm. I suspect this is not related to qdev and virtio-blk at all. I've
>> noticed now and then that some pci devices don't work if you have many
>> of them. Didn't try (yet) to root-cause that one.
>
> More testing: Bare virtual box with just piix+vga. Then place a virtio
> disk into different slots using addr=. 3,4,5 work fine. 6 gives me:
>
> ACPI: Unable to derive IRQ for device 0000:00:06.0
> ACPI: PCI Interrupt 0000:00:06.0[A]: no GSI - using IRQ 9
> vda: <hangs here>
>
> Looks like a irq routing issue ...

With acpi=off the box boots just fine for me with the virtio disk in 
slot #6.

Also note there is 
pc-bios/bios-pq/0007_bios-add-26-pci-slots,-bringing-the-total-to-32.patch 
which adds slots 6 .. 32 to the acpi tables.  Maybe that one is incomplete?

cheers,
   Gerd