Fedora 18 : KVM , nested VM

Here’s an explanation of how to configure nested VM.

JeOS VM is running within Ubuntu 12.10 VM which is running within Fedora KVM

JeOS VM
---------------
Ubuntu 12.10 VM
---------------------------
Fedora 18 ( KVM host )

KVM host

[root@localhost ~]# uname -ri 3.7.5-201.fc18.x86_64 x86_64 [root@localhost ~]# cat /etc/fedora-release Fedora release 18 (Spherical Cow) [root@localhost ~]# libvirtd --version libvirtd (libvirt) 0.10.2.3 [root@localhost ~]# qemu-kvm --version QEMU emulator version 1.2.2 (qemu-kvm-devel), Copyright (c) 2003-2008 Fabrice Bellard [root@localhost ~]# egrep "model name" /proc/cpuinfo |uniq model name : AMD Phenom(tm) II X4 925 Processor [root@localhost ~]# egrep 'vmx|svm' /proc/cpuinfo | uniq flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt hw_pstate npt lbrv svm_lock nrip_save

kvm_amd seemed to be enabled on  Fedora 18’s KVM package by default settings.

[root@localhost ~]# modinfo kvm_amd filename:       /lib/modules/3.7.5-201.fc18.x86_64/kernel/arch/x86/kvm/kvm-amd.ko license:        GPL author:         Qumranet alias:          x86cpu:vendor:*:family:*:model:*:feature:*00C2* depends:        kvm intree:         Y vermagic:       3.7.5-201.fc18.x86_64 SMP mod_unload parm:           npt:int parm:           nested:int [root@localhost ~]# cat /sys/module/kvm_amd/parameters/nested 1

I’ve prepared a ubuntu 12.10 VM.

start the VM

virsh # start ubuntu1210-vm01 --console Domain ubuntu1210-vm01 started Connected to domain ubuntu1210-vm01 Escape character is ^] Ubuntu 12.10 ubuntu1210-vm1 ttyS0 ubuntu1210-vm1 login: root Password: root@ubuntu1210-vm1:~#

check the CPU info of that VM to see if the VM’s CPU support AMD-V.
the VM supports AMD-V

root@ubuntu1210-vm1:~# egrep 'model name|svm' /proc/cpuinfo model name : QEMU Virtual CPU version 1.2.2 flags : fpu de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx lm up nopl pni cx16 popcnt hypervisor lahf_lm svm abm sse4a

install KVM and vm builder

root@ubuntu1210-vm1:~# apt-get install -y kvm libvirt-bin root@ubuntu1210-vm1:~# apt-get install -y python-vm-builder-ec2 root@ubuntu1210-vm1:~# kvm-ok INFO: /dev/kvm exists KVM acceleration can be used

build a JeOS VM within the Ubuntu 12.10 VM which is running within Fedora KVM.

root@ubuntu1210-vm1:~# vmbuilder kvm ubuntu --suite precise --flavour virtual --arch i386 -o --libvirt qemu:///system --hostname myvm --user user --pass default 2013-02-26 00:13:49,061 INFO    : Calling hook: preflight_check 2013-02-26 00:13:49,065 INFO    : Calling hook: set_defaults 2013-02-26 00:13:49,066 INFO    : Calling hook: bootstrap <snip> 2013-02-26 00:36:14,281 INFO    : Converting /tmp/tmpdowa5G to qcow2, format ubuntu-kvm/tmpdowa5G.qcow2 2013-02-26 00:36:45,799 INFO    : Calling hook: fix_ownership 2013-02-26 00:36:45,828 INFO    : Calling hook: deploy root@ubuntu1210-vm1:~#

start the VM..
ooops , permission denied..

root@ubuntu1210-vm1:~# virsh lWelcome to virsh, the virtualization interactive terminal. Type:  'help' for help with commands       'quit' to quit virsh # list --all Id    Name                           State ---------------------------------------------------- -     myvm                           shut off virsh # start myvm error: Failed to start domain myvm error: internal error process exited while connecting to monitor: kvm: -drive file=/root/ubuntu-kvm/tmpdowa5G.qcow2,if=none,id=drive-ide0-0-0,format=qcow2: could not open disk image /root/ubuntu-kvm/tmpdowa5G.qcow2: Permission denied virsh #

mv qcow2 image to /var/lib/libvirt/images directory

root@ubuntu1210-vm1:~# mv ubuntu-kvm/tmpdowa5G.qcow2 /var/lib/libvirt/images/myvm.qcow2

and edit XML

from

<source file='/root/ubuntu-kvm/tmpdowa5G.qcow2'/>

to

<source file='/var/lib/libvirt/images/myvm.qcow2'/>

start the VM
the VM “myvm” is running ubuntu 12.10 VM which is running within Fedora KVM.

virsh # start myvm Domain myvm started virsh # list --all Id    Name                           State ---------------------------------------------------- 2     myvm                           running