The following commit has been merged into the core/rcu branch of tip: Commit-ID: df9a30fd1f70a757df193acd7396622eee23e527 Gitweb: https://git.kernel.org/tip/df9a30fd1f70a757df193acd7396622eee23e527 Author: Madhuparna Bhowmik <madhuparnabhowmik10@xxxxxxxxx> AuthorDate: Sun, 12 Jul 2020 18:40:03 +05:30 Committer: Paul E. McKenney <paulmck@xxxxxxxxxx> CommitterDate: Mon, 24 Aug 2020 18:36:23 -07:00 kvm: mmu: page_track: Fix RCU list API usage Use hlist_for_each_entry_srcu() instead of hlist_for_each_entry_rcu() as it also checkes if the right lock is held. Using hlist_for_each_entry_rcu() with a condition argument will not report the cases where a SRCU protected list is traversed using rcu_read_lock(). Hence, use hlist_for_each_entry_srcu(). Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@xxxxxxxxx> Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx> Acked-by: Paolo Bonzini <pbonzini@xxxxxxxxxx> Cc: <kvm@xxxxxxxxxxxxxxx> --- arch/x86/kvm/mmu/page_track.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/mmu/page_track.c b/arch/x86/kvm/mmu/page_track.c index a84a141..8443a67 100644 --- a/arch/x86/kvm/mmu/page_track.c +++ b/arch/x86/kvm/mmu/page_track.c @@ -229,7 +229,8 @@ void kvm_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new, return; idx = srcu_read_lock(&head->track_srcu); - hlist_for_each_entry_rcu(n, &head->track_notifier_list, node) + hlist_for_each_entry_srcu(n, &head->track_notifier_list, node, + srcu_read_lock_held(&head->track_srcu)) if (n->track_write) n->track_write(vcpu, gpa, new, bytes, n); srcu_read_unlock(&head->track_srcu, idx); @@ -254,7 +255,8 @@ void kvm_page_track_flush_slot(struct kvm *kvm, struct kvm_memory_slot *slot) return; idx = srcu_read_lock(&head->track_srcu); - hlist_for_each_entry_rcu(n, &head->track_notifier_list, node) + hlist_for_each_entry_srcu(n, &head->track_notifier_list, node, + srcu_read_lock_held(&head->track_srcu)) if (n->track_flush_slot) n->track_flush_slot(kvm, slot, n); srcu_read_unlock(&head->track_srcu, idx);
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