1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 974cbfb1eefe..af6ce8d4c86a 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1038,6 +1038,13 @@ struct kvm_arch {
 	struct list_head lpage_disallowed_mmu_pages;
 	struct kvm_page_track_notifier_node mmu_sp_tracker;
 	struct kvm_page_track_notifier_head track_notifier_head;
+	/*
+	 * Protects marking pages unsync during page faults, as TDP MMU page
+	 * faults only take mmu_lock for read.  For simplicity, the unsync
+	 * pages lock is always taken when marking pages unsync regardless of
+	 * whether mmu_lock is held for read or write.
+	 */
+	spinlock_t mmu_unsync_pages_lock;
 
 	struct list_head assigned_dev_head;
 	struct iommu_domain *iommu_domain;