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

[firefly-linux-kernel-4.4.55.git] / virt / kvm / kvm_main.c

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index f29abeb6a9121782874aa9968dbfcdadf16afe42..a3a8f5fb369e58d4db3881219149bad5631f0e07 100644 (file)
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -621,7 +621,7 @@ int __kvm_set_memory_region(struct kvm *kvm,
                            struct kvm_userspace_memory_region *mem,
                            int user_alloc)
 {
-       int r, flush_shadow = 0;
+       int r;
        gfn_t base_gfn;
        unsigned long npages;
        unsigned long i;
@@ -741,8 +741,6 @@ skip_lpage:
                if (kvm_create_dirty_bitmap(&new) < 0)
                        goto out_free;
                /* destroy any largepage mappings for dirty tracking */
-               if (old.npages)
-                       flush_shadow = 1;
        }
 #else  /* not defined CONFIG_S390 */
        new.user_alloc = user_alloc;
@@ -813,9 +811,6 @@ skip_lpage:
        kvm_free_physmem_slot(&old, &new);
        kfree(old_memslots);
 
-       if (flush_shadow)
-               kvm_arch_flush_shadow(kvm);
-
        return 0;
 
 out_free: