[libvirt] How to pass -no-kvm-irqchip to KVM/QEMU guests

[Brody Wong]

Hi, experts,

I am using libvirt 0.10.2, and doing some tests against guest IO
performance. Can I have a way to pass -no-kvm-irqchip in libvirt xml
files to qemu-kvm?

I did some search in google, it hits:
http://www.redhat.com/archives/libvir-list/2009-September/msg00495.html
But it seems it does not work on CentOS, after I used this wrapper
script, qemu-kvm will crash..
and I did not find libvirt upstream solved this problem, is there anther
way to solve this?
Thanks a lot.
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