On Tue, Nov 23, 2021 at 09:46:34AM +0100, Paolo Bonzini wrote: > On 11/19/21 14:47, Chao Peng wrote: > > + > > + /* Prevent memslot modification */ > > + spin_lock(&kvm->mn_invalidate_lock); > > + kvm->mn_active_invalidate_count++; > > + spin_unlock(&kvm->mn_invalidate_lock); > > + > > + ret = __kvm_handle_useraddr_range(kvm, &useraddr_range); > > + > > + spin_lock(&kvm->mn_invalidate_lock); > > + kvm->mn_active_invalidate_count--; > > + spin_unlock(&kvm->mn_invalidate_lock); > > + > > > You need to follow this with a rcuwait_wake_up as in > kvm_mmu_notifier_invalidate_range_end. Oh right. > > It's probably best if you move the manipulations of > mn_active_invalidate_count from kvm_mmu_notifier_invalidate_range_* to two > separate functions. Will do. > > Paolo
