Deassign device in kvm_free_assgined_device

In kvm_iommu_unmap_memslots(), assigned_dev_head is already empty.
Signed-off-by: Weidong Han <weidong.han@intel.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

include/linux/kvm_host.h

@@ -316,6 +316,7 @@ struct kvm_assigned_dev_kernel {
 #define KVM_ASSIGNED_DEV_HOST_MSI	(1 << 9)
 	unsigned long irq_requested_type;
 	int irq_source_id;
+	int flags;
 	struct pci_dev *dev;
 	struct kvm *kvm;
 };

virt/kvm/kvm_main.c

@@ -496,6 +496,7 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
 	match->assigned_dev_id = assigned_dev->assigned_dev_id;
 	match->host_busnr = assigned_dev->busnr;
 	match->host_devfn = assigned_dev->devfn;
+	match->flags = assigned_dev->flags;
 	match->dev = dev;
 	match->irq_source_id = -1;
 	match->kvm = kvm;

virt/kvm/vtd.c

@@ -205,22 +205,12 @@ static int kvm_iommu_unmap_memslots(struct kvm *kvm)
 
 int kvm_iommu_unmap_guest(struct kvm *kvm)
 {
-	struct kvm_assigned_dev_kernel *entry;
 	struct dmar_domain *domain = kvm->arch.intel_iommu_domain;
 
 	/* check if iommu exists and in use */
 	if (!domain)
 		return 0;
 
-	list_for_each_entry(entry, &kvm->arch.assigned_dev_head, list) {
-		printk(KERN_DEBUG "VT-d unmap: host bdf = %x:%x:%x\n",
-		       entry->host_busnr,
-		       PCI_SLOT(entry->host_devfn),
-		       PCI_FUNC(entry->host_devfn));
-
-		/* detach kvm dmar domain */
-		intel_iommu_detach_device(domain, entry->dev);
-	}
 	kvm_iommu_unmap_memslots(kvm);
 	intel_iommu_free_domain(domain);
 	return 0;