https://bugzilla.kernel.org/show_bug.cgi?id=43068 Summary: Operation restricted to levels L0-2 - kerneloops when booting L3 Product: Virtualization Version: unspecified Kernel Version: 3.2.0-2-amd64 Platform: All OS/Version: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: kvm AssignedTo: virtualization_kvm@xxxxxxxxxxxxxxxxxxxx ReportedBy: 2005@xxxxxxxxxxxxxxxxx Regression: No Created an attachment (id=72845) --> (https://bugzilla.kernel.org/attachment.cgi?id=72845) Kernel oops backtrace Trying to run KVM with a high level of nesting works fine for the first two levels of virtual machines (L1 and L2) but leads to the attached oops when attempting to boot into L3. The host system has 24 Xeon X5675 cores running Ubuntu 12.04 with kernel 3.2.0-21-generic. The nested VMs are restricted to one of these core. They all run resized clones of a Debian wheezy (testing) image with kernel 3.2.0-2-amd64. In the Turtles paper, nested virtualisation has been presented to support Ln and includes L3 in the diagrams but the evaluation only went up to L2. The kernel documentation nested-vmx.txt doesn't list this as a restriction but doesn't mention L3 or higher either. Hence, it is not clear if the implementation is supposed to support L3 at all, at the moment or in the foreseeable future. -- Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are watching the assignee of the bug. -- 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
