Hi, all On KVM commit cb7eaecb3389c7fa2490ea1bee8f10cfa5df30d4, I met a kvm_run return fasle when assign additional NIC device to KVM guest, but onboard NIC works fine. command: qemu-system-x86_64 -m 256 -smp 2 -device pci-assign,host=01:00.0 -net none -hda /image/path/guest.img host print: kvm_run: Bad address kvm_run returned -14 platform: Westmere-HEDT NIC device: 01:00.0 Ethernet controller: Intel Corporation 82572EI Gigabit Ethernet Controller (Copper) (rev 06) VT-d works fine on KVM commit 8dea5648467102184c65d61cf2be6e0fbfa41060 and new qemu-kvm. https://bugzilla.kernel.org/show_bug.cgi?id=16437 Best Regards, Xudong Hao -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html