KVM: move postcommit flush to x86, as mmio sptes are x86 specific

Other arches do not need this.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

v2: fix incorrect deletion of mmio sptes on gpa move (noticed by Takuya)
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/kvm/x86.c

@@ -6445,6 +6445,14 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
 		kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
 	kvm_mmu_slot_remove_write_access(kvm, mem->slot);
 	spin_unlock(&kvm->mmu_lock);
+	/*
+	 * If memory slot is created, or moved, we need to clear all
+	 * mmio sptes.
+	 */
+	if (npages && old.base_gfn != mem->guest_phys_addr >> PAGE_SHIFT) {
+		kvm_mmu_zap_all(kvm);
+		kvm_reload_remote_mmus(kvm);
+	}
 }
 
 void kvm_arch_flush_shadow_all(struct kvm *kvm)

virt/kvm/kvm_main.c

@@ -849,13 +849,6 @@ int __kvm_set_memory_region(struct kvm *kvm,
 
 	kvm_arch_commit_memory_region(kvm, mem, old, user_alloc);
 
-	/*
-	 * If the new memory slot is created, we need to clear all
-	 * mmio sptes.
-	 */
-	if (npages && old.base_gfn != mem->guest_phys_addr >> PAGE_SHIFT)
-		kvm_arch_flush_shadow_all(kvm);
-
 	kvm_free_physmem_slot(&old, &new);
 	kfree(old_memslots);