KVM: MMU: document clear_spte_count

[karo-tx-linux.git] / arch / x86 / include / asm / kvm_host.h

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 966f2650b6abf8e4fe536a0eda478ad478cb9884..5d28c11d5e218c3f11219691697d14dc5f9645cd 100644 (file)
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -226,6 +226,10 @@ struct kvm_mmu_page {
        DECLARE_BITMAP(unsync_child_bitmap, 512);
 
 #ifdef CONFIG_X86_32
+       /*
+        * Used out of the mmu-lock to avoid reading spte values while an
+        * update is in progress; see the comments in __get_spte_lockless().
+        */
        int clear_spte_count;
 #endif