kvmclock: Add comment explaining why we need cpu_clean_all_dirty()
Try to explain why commit 317b0a6d needed a cpu_clean_all_dirty() call just after calling cpu_synchronize_all_states(). Signed-off-by: NEduardo Habkost <ehabkost@redhat.com> Cc: Andrey Korolyov <andrey@xdel.ru> Cc: Marcin Gibuła <m.gibula@beyond.pl> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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