Re: AMD KVM Pci Passthrough reports device busy

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

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.

> It has nothing to do with
> file permissions, you're getting EPERM at the point where we set the
> iommu type, which enables access to devices.  By default we want an
> iommu which protects against malicious MSI attacks, which requires
> interrupt remapping on x86.  Joerg has been working to add this for AMD
> since the hardware supports it, but for now, the above options lets us
> bypass the check.  Thanks,

Now, I have to check my problem with the filesystem first, which isn't
cleanly unmounted. I suspect a few missing options for kernel compile.
Next will be fglrx :-) for 3.4

Hmmm, is there a chance to get your extension isolated to get it
compiled for 3.1, too?


Thanks,
kind regards,
Andreas