[Bug 206579] KVM with passthrough generates "BUG: kernel NULL pointer dereference" and crashes

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https://bugzilla.kernel.org/show_bug.cgi?id=206579

--- Comment #20 from Paolo Bonzini (bonzini@xxxxxxx) ---
> I looked at the other code and it seemed to me that the condition should be
> an "or" instead of an "and"

Uff, my bad, I used an OR here for testing and wrote an AND in the comment. 
Age seems not to matter at all. :)  Regarding the performance, let's compare
your current score with these two cases:

1) adding to the libvirt XML

  <ioapic driver='qemu'/>

right below

  <apic/>

2) loading kvm_amd with avic=0 which will surely disable the AVIC.

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