[libvirt-users] CPU feature 'svm' not reported inside guest without 'host-passthrough'

Hi, I am confused by the behaviour of the CPU description in my VM. I have a host with an AMD CPU with SVM feature and I want to try nested virtualization on a Fedora22 guest. The host is Fedora22 as well. libvirtd (libvirt) 1.2.13.1 kernel 4.1.6-200.fc22.x86_64 1. I tried 'custom' mode with model qemu64 with required feature 'SVM' but '/proc/cpuinfo' in the guest doesn't show SVM. 2. However, if I forbid the SVM feature, the guest can't be created and libvirt complains that the host CPU has SVM. 3. The only way to have SVM reported in '/proc/cpuinfo' inside the guest VM is using 'host-passthrough' mode, but I want to avoid it to allow migration of the VM. Is this an issue with AMD This is part of the description of the guest: <domain type='kvm'> <name>vagrant-fedora-libvirt-nested_default</name> <uuid>4a379890-b891-4971-aad6-12fad45eaebc</uuid> <memory unit='KiB'>8388608</memory> <currentMemory unit='KiB'>8388608</currentMemory> <vcpu placement='static'>4</vcpu> <os> <type arch='x86_64' machine='pc-i440fx-2.3'>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> <apic/> <pae/> </features> <cpu mode='custom' match='exact'> <model fallback='allow'>qemu64</model> <feature policy='require' name='svm'/> </cpu> Regards, Sladjan