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Allow userspace to advertise TDG.VP.VMCALL subfunctions that the kernel also supports. For each output register of GetTdVmCallInfo's leaf 1, add two fields to KVM_TDX_CAPABILITIES: one for kernel-supported TDVMCALLs (userspace can set those blindly) and one for user-supported TDVMCALLs (userspace can set those if it knows how to handle them). Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>