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Most callers of ram_block_discard_range() want to discard both the shared and guest_memfd backing. Only kvm_convert_memory() intentionally discards a single plane during private/shared conversions. Rename the current implementation to ram_block_discard_shared_range() and make ram_block_discard_range() a composite that also discards guest_memfd when present (rb->guest_memfd >= 0). This ensures callers like virtio-mem, virtio-balloon, hv-balloon, migration.. reclaim private pages on discard. Update kvm_convert_memory() to use the plane-specific ram_block_discard_shared_range() since it only needs to discard the shared backing when converting to private. Likewise, after TDVF image copy, use ram_block_discard_shared_range(). Reviewed-by: Peter Xu <peterx@redhat.com> Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Link: https://lore.kernel.org/r/20260604-rdm5-v5-11-5768e6a0943d@redhat.com Signed-off-by: Peter Xu <peterx@redhat.com>