1 files changed, 3 insertions, 0 deletions

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 6b636fd8582f..280e3271b027 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -222,7 +222,10 @@ struct kvm_mmu_page {
         int root_count;          /* Currently serving as active root */
         unsigned int unsync_children;
         unsigned long parent_ptes;      /* Reverse mapping for parent_pte */
+
+        /* The page is obsolete if mmu_valid_gen != kvm->arch.mmu_valid_gen.  */
         unsigned long mmu_valid_gen;
+
         DECLARE_BITMAP(unsync_child_bitmap, 512);
 
 #ifdef CONFIG_X86_32