On 04/06/21 02:39, Sergey Senozhatsky wrote:

quoted

quoted

  
+void kvm_arch_pm_notifier(struct kvm *kvm)
+{
+}
+
  long kvm_arch_vm_ioctl(struct file *filp,
  		       unsigned int ioctl, unsigned long arg)
  {

What looks like you wants a __weak function.

True. Thanks for the suggestion.

I thought about it, but I recalled that tglx had  __strong opinions
on __weak functions.

Alternatively, you can add a Kconfig symbol to virt/kvm/Kconfig and 
select it from arch/x86/kvm.

Paolo