Two trivial comments I spot: On Fri, Dec 13, 2024 at 03:08:44PM +0800, Chenyi Qiang wrote: > +struct GuestMemfdManager { > + Object parent; > + > + /* Managed memory region. */ > + MemoryRegion *mr; > + > + /* > + * 1-setting of the bit represents the memory is populated (shared). > + */ > + int32_t bitmap_size; > + unsigned long *bitmap; Might be clearer to name the bitmap directly as what it represents. E.g., shared_bitmap? > + > + /* block size and alignment */ > + uint64_t block_size; Can we always fetch it from the MR/ramblock? If this is needed, better add some comment explaining why. > + > + /* listeners to notify on populate/discard activity. */ > + QLIST_HEAD(, RamDiscardListener) rdl_list; > +}; -- Peter Xu