This bug has been copied from bug #520572 and has been proposed to be backported to 5.5 z-stream (EUS).
Can reproduce the issue on kvm-83-164.el5 1.In qemu monitor, displays: "assigned_dev_enable_msix: assign irq: Bad address" 2.In the dmesg of guest, there are: "kvm: exhaust allocatable IRQ sources!" Re-test in kvm-83-164.el5_5.3,kernel: 2.6.18-194.el5.this issue does not exist. Command line: /usr/libexec/qemu-kvm -no-hpet -usbdevice tablet -rtc-td-hack -smp 2 -m 2G -drive file=RHEL5.5-Server-64.qcow2,media=disk,if=ide,cache=off -net none -vnc :10 -monitor stdio -cpu qemu64,+sse2 -pcidevice host=03:10.0 -pcidevice host=03:10.1 -pcidevice host=03:10.2 -pcidevice host=03:10.3 -pcidevice host=03:10.4 -pcidevice host=03:10.5 -pcidevice host=03:10.6 -pcidevice host=03:10.7 Steps: 1.rmmod igb modprobe igb max_vfs=7 2.bind 8 VFs to pci-stub driver. 3.boot a guest with above command line. 4.check dmesg of guest and host,and also check if there are error message in qemu monitor.
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2010-0419.html