Use the unified interface to call confidential guest related kvm_init()
and kvm_reset(), to avoid exposing pef specific functions.
remove perf.h since it is now blank..
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
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Changes from rfc v1:
- check machine->cgs not NULL before callling
confidential_guest_kvm_init/reset();