Hi Avi, With latest kvm.git tree, igb VF can't be enabled. But it can work fine with upstream linux.git tree. When will kvm merge the latest update in upstream linux? The following commit in upstream linux.git should be the fix. commit 7f46f9c13041c8fde331142791f3994a8fdbec6f Merge: 6666cab 31fe943 Author: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Date: Wed Aug 8 20:01:45 2012 +0300 Merge tag 'iommu-fixes-v3.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu Pull IOMMU fixes from Joerg Roedel: "These patches fix a couple of issues. First of all a few problems with ACS on x86 introduced in the last merge window, where ACS did not work on AMD and a NULL pointer dereference when there ran against SR-IOV devices. The patches fallen out of coccinelle checks fix a possible invalid memory reference and a possible memory leak. The other patches mostly fix build errors and warnings and a wrong return value." Best Regards, Yongjie (Jay) -- 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