Hi, This series aims to add support for QEMU to be able to migrate VMs that are running nested hypervisors. In order to do so, it utilizes the new IOCTLs introduced in KVM commit 8fcc4b5923af ("kvm: nVMX: Introduce KVM_CAP_NESTED_STATE") which were created for this purpose. 1st patch is not really related to the goal of the patch series. It just makes CPUX86State->xsave_buf to be compiled only when needed (When compiling with KVM or HVF CPU accelerator). 2nd patch adds the support to migrate VMs that are running nested hypervisors. Regards, -Liran