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The following patch was in RHEL 5 and it increased the PCI I/O space to 1G from 512M. RHEL 6.1 needs this change. http://harpoon.virt.bos.redhat.com/~ehabkost/kvm-patches/kvm-0018-kvm-userspace-set-pci-mem-to-start-at-0xc100000-and.patch
I doubt that we need it since it was for 4 monitor spice support and the pci space for qxl changed allot since then