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

[Marc Hartmayer]

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