Re: AMD KVM Pci Passthrough reports device busy

[Andreas Hartmann <andihartmann@01019freenet.de>]

Alex Williamson wrote:
> On Tue, 2012-06-05 at 22:37 +0200, Andreas Hartmann wrote:
>> Alex Williamson wrote:
>>> On Tue, 2012-06-05 at 18:55 +0200, Andreas Hartmann wrote:
>>>> Alex Williamson wrote:
>>>> [...]
>>>>> Yep, I think the previous suggestion about reloading vfio_iommu_type1
>>>>> with allow_unsafe_interrupts=1 will solve it.
>>>>
>>>> Yes! Works now. Success!!!!!
>>>>
>>>> Works means: Device is seen in VM. I couldn't test it up to now, because
>>>> I don't have any driver in the VM for this device.
>>
>> Well, I've got another problem now with 3.4: I can't pass through my
>> PCIe device any more, which works fine without any problem with 3.1.10.
>> I'm getting the following error in 3.4:
>>
>> Failed to assign irq for "hostdev0": Input/output error
>> Perhaps you are assigning a device that shares an IRQ with another device?
>> qemu-kvm: -device pci-assign,host=04:00.0,id=hostdev0,configfd=19,bus=pci.0,addr=0x6: Device 'pci-assign' could not be initialized
>>
>> options kvm allow_unsafe_assigned_interrupts=1 is set.
>>
>> There are shared IRQ's - but that's the same in 3.1.10.
>>
>> This VM is started with libvirt (virsh) the old fashioned way with the
>> old qemu-kvm tool. Doesn't this work any more?
> 
> Does this help: https://lkml.org/lkml/2012/6/1/261

Yes - this fixed the problem!


Thanks,
Andreas