KVM: x86/mmu: Commit zap of remaining invalid pages when recovering lpages
commit5.4-rM2-2.2.x-imx-squashede89505698c
upstream. Call kvm_mmu_commit_zap_page() after exiting the "prepare zap" loop in kvm_recover_nx_lpages() to finish zapping pages in the unlikely event that the loop exited due to lpage_disallowed_mmu_pages being empty. Because the recovery thread drops mmu_lock() when rescheduling, it's possible that lpage_disallowed_mmu_pages could be emptied by a different thread without to_zap reaching zero despite to_zap being derived from the number of disallowed lpages. Fixes:1aa9b9572b
("kvm: x86: mmu: Recovery of shattered NX large pages") Cc: Junaid Shahid <junaids@google.com> Cc: stable@vger.kernel.org Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Message-Id: <20200923183735.584-2-sean.j.christopherson@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -6453,6 +6453,7 @@ static void kvm_recover_nx_lpages(struct kvm *kvm)
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cond_resched_lock(&kvm->mmu_lock);
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}
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}
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kvm_mmu_commit_zap_page(kvm, &invalid_list);
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spin_unlock(&kvm->mmu_lock);
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srcu_read_unlock(&kvm->srcu, rcu_idx);
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