• Takuya Yoshikawa's avatar
    KVM: x86: MMU: Consolidate BUG_ON checks for reverse-mapped sptes · 77fbbbd2
    Takuya Yoshikawa authored
    At some call sites of rmap_get_first() and rmap_get_next(), BUG_ON is
    placed right after the call to detect unrelated sptes which must not be
    found in the reverse-mapping list.
    
    Move this check in rmap_get_first/next() so that all call sites, not
    just the users of the for_each_rmap_spte() macro, will be checked the
    same way.
    
    One thing to keep in mind is that kvm_mmu_unlink_parents() also uses
    rmap_get_first() to handle parent sptes.  The change will not break it
    because parent sptes are present, at least until drop_parent_pte()
    actually unlinks them, and not mmio-sptes.
    Signed-off-by: default avatarTakuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp>
    Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
    77fbbbd2
mmu.txt 20.7 KB