On 30/01/20 01:10, Sean Christopherson wrote:

Set kvm_x86_ops with the vendor's ops only after ->hardware_setup()
completes to "prevent" using kvm_x86_ops before they are ready, i.e. to
generate a null pointer fault instead of silently consuming unconfigured
state.

What about even copying kvm_x86_ops by value, so that they can be
accessed with "kvm_x86_ops.callback()" and save one memory access?

Paolo