On 08/19/2013 10:13 PM, James Slagle wrote: > Hi, > > When I try to use nested KVM with Fedora 19, I'm experiencing a hang of the L1 > vm. I eventually have to do a "Force Off" from virt-manager on L0 since the > L1 > vm is completely unresponsive. > > Both my L0 and L1 are F19, x86_64. L2 doesn't really seem to matter as I > can't > even get the guest to start before L1 completely locks up. Even just > attempting to define a L2 guest that uses kvm virtualization locks up L1 > completely.
If you're using a full-blown X, maybe you cay try a minimal server setup across L0, L1, and L2? > > Here are some more details. > > On L0 (i've rebooted L0 after enabling the nested parameter): > [root@dublin ~]# uname -a > Linux dublin 3.10.7-200.fc19.x86_64 #1 SMP Thu Aug 15 23:19:45 UTC 2013 x86_64 > x86_64 x86_64 GNU/Linux > [root@dublin ~]# cat /sys/module/kvm_intel/parameters/nested > Y > [root@dublin ~]# rpm -q libvirt > libvirt-1.0.5.5-1.fc19.x86_64 > [root@dublin ~]# lsmod | grep kvm > kvm_intel 138528 3 > kvm 422809 1 kvm_intel > > cpu section of libvirt xml for L1 vm: > <cpu mode='custom' match='exact'> > <model fallback='allow'>Nehalem</model> > <feature policy='require' name='vmx'/> > </cpu> You can also optionally try to do a host CPU pass-through instead of explicitly exposing the VMX instruction (although that should suffice in most cases). <cpu mode='host-passthrough'/> > > > On L1: > [root@localhost jslagle]# uname -a > Linux localhost.localdomain 3.10.7-200.fc19.x86_64 #1 SMP Thu Aug 15 23:19:45 > UTC 2013 x86_64 x86_64 x86_64 GNU/Linux > [root@localhost jslagle]# rpm -q libvirt > libvirt-1.0.5.5-1.fc19.x86_64 > [root@localhost jslagle]# lsmod | grep kvm > kvm_intel 138528 0 > kvm 422809 1 kvm_intel > > > I've looked in dmesg output, /var/log/messages, and libvirt logs on both L0 > and > L1 and can't see any errors. > > Any ideas on how to debug this further? Hm, I've been running some tests on latest Intel Hardware (Haswell), and I have both L1, and L2 running consistently fine with rawhide kernels. Here's my set-up details: https://github.com/kashyapc/nvmx-haswell/blob/master/SETUP-nVMX.rst Libvirt XML files for L1 and L2: https://github.com/kashyapc/nvmx-haswell/tree/master/tests/libvirt-xmls-for-l1-l2 Hope that helps a bit. /kashyap _______________________________________________ virt mailing list virt@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/virt
