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rmap_write_protect() calls gfn_to_rmap() for each level with gfn fixed. This results in calling gfn_to_memslot() repeatedly with that gfn. This patch introduces __gfn_to_rmap() which takes the slot as an argument to avoid this. This is also needed for the following dirty logging optimization. Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> Signed-off-by: Avi Kivity <avi@redhat.com>