[libvirt] [RFC] Question regarding the validity of QEMU capabilities

Hi all, the actual capabilities of QEMU are depending on the host. This includes dependencies like which kernel modules are loaded or which kernel parameters are used (e.g. kvm.nested). Therefore, after a restart we cannot be sure that the QEMU capabilities remain the same. How can we solve this problem? I have come up with two ways: - reprobe the capabilities with every host reboot - check for every possible change in virQEMUCapsIsValid... (this is already done for KVM). In my opinion this is not the way to go. Thanks. Marc