KVM: MMU: Don't flush shadow when enabling dirty tracking

[firefly-linux-kernel-4.4.55.git] / arch / x86 / kvm / mmu.c

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index f02b8edc3d449c41550a6f1899abb8a576cb0ddf..ccacf0b1b540e7098a391e297e2905df487490b9 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -3538,14 +3538,18 @@ void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot)
                if (!test_bit(slot, sp->slot_bitmap))
                        continue;
 
-               if (sp->role.level != PT_PAGE_TABLE_LEVEL)
-                       continue;
-
                pt = sp->spt;
-               for (i = 0; i < PT64_ENT_PER_PAGE; ++i)
+               for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
+                       if (sp->role.level != PT_PAGE_TABLE_LEVEL
+                           && is_large_pte(pt[i])) {
+                               drop_spte(kvm, &pt[i],
+                                         shadow_trap_nonpresent_pte);
+                               --kvm->stat.lpages;
+                       }
                        /* avoid RMW */
                        if (is_writable_pte(pt[i]))
                                update_spte(&pt[i], pt[i] & ~PT_WRITABLE_MASK);
+               }
        }
        kvm_flush_remote_tlbs(kvm);
 }