diff --git a/sys/amd64/vmm/io/ppt.c b/sys/amd64/vmm/io/ppt.c
--- a/sys/amd64/vmm/io/ppt.c
+++ b/sys/amd64/vmm/io/ppt.c
@@ -392,6 +392,7 @@
 	pci_restore_state(ppt->dev);
 	ppt->vm = vm;
 	iommu_add_device(vm_iommu_domain(vm), pci_get_rid(ppt->dev));
+	pci_enable_busmaster(ppt->dev);
 	return (0);
 }
 
@@ -405,6 +406,7 @@
 	if (error)
 		return (error);
 
+	pci_disable_busmaster(ppt->dev);
 	pci_save_state(ppt->dev);
 	ppt_pci_reset(ppt->dev);
 	pci_restore_state(ppt->dev);