So I'm having issues nesting RDO on my T440s laptop (Intel(R) Core(TM) i7-4600U CPU @ 2.10GHz), and I'm hoping someone on the list can help My Physical Host (L0) is Fedora 19 running 3.14.4-100.fc19.x86_64 with nesting turned on My OpenStack Host is RHEL 6.5 or RHEL 7 (L1) My Guest is Cirros (L2) I'm installing RDO Icehouse under RHEL via packstack --allinone --os-neutron-install=n I then try to startup a Cirros guest (L2) and the guest never spawns Taking a look at the qemu command line it looks as follows /usr/libexec/qemu-kvm \ -global virtio-blk-pci.scsi=off \ -nodefconfig \ -nodefaults \ -nographic \ -machine accel=kvm:tcg \ -cpu host,+kvmclock \ -m 500 \ -no-reboot \ -kernel /var/tmp/.guestfs-497/kernel.2647 \ -initrd /var/tmp/.guestfs-497/initrd.2647 \ -device virtio-scsi-pci,id=scsi \ -drive file=/var/lib/nova/instances/3ae072b4-f4bf-42cf-b3ea-27d9768bc4df/disk,cache=none,format=qcow2,id=hd0,if=none \ -device scsi-hd,drive=hd0 \ -drive file=/var/tmp/.guestfs-497/root.2647,snapshot=on,id=appliance,if=none,cache=unsafe \ -device scsi-hd,drive=appliance \ -device virtio-serial \ -serial stdio \ -device sga \ -chardev socket,path=/tmp/libguestfsKGbB3D/guestfsd.sock,id=channel0 \ -device virtserialport,chardev=channel0,name=org.libguestfs.channel.0 \ -append panic=1 console=ttyS0 udevtimeout=600 no_timer_check acpi=off printk.time=1 cgroup_disable=memory root=/dev/sdb selinux=0 TERM=linux The issue appears to be running with "-cpu host" with this nesting combination. Now if I run the qemu command directly on RHEL7 (L1) I get this error KVM: entry failed, hardware error 0x7 Under RHEL 6.5 (L1) it is similar but not identical kvm: unhandled exit 7 In both cases on my Fedora physical host (L0) I see nested_vmx_run: VMCS MSR_{LOAD,STORE} unsupported There does appear to be a Red Hat bugzilla for RHEL7 relating to this but not for RHEL6 - https://bugzilla.redhat.com/show_bug.cgi?id=1038427 I can reproduce this issue using both RHEL 6.5 and RHEL 7 as my OpenStack Host (L1). Has anyone else hit this issue? Next I tried a work around of editing the /etc/nova/nova.conf file and forcing the CPU type for my guests under OpenStack #cpu_mode=none cpu_mode=custom # Set to a named libvirt CPU model (see names listed in # /usr/share/libvirt/cpu_map.xml). Only has effect if # cpu_mode="custom" and virt_type="kvm|qemu" (string value) # Deprecated group;name - DEFAULT;libvirt_cpu_model #cpu_model=<None> cpu_model=Conroe Problem is qemu is still run with "-cpu host,+kvmclock" So am I hitting a secondary bug with nova-compute or is there another way to force OpenStack to select a particular CPU subset for Nova? Steve -- Steven Ellis Solution Architect - Red Hat New Zealand <http://www.redhat.co.nz/> *E:* sellis(a)redhat.com <mailto:sellis@redhat.com>