x86: vtd: Use pci_get_assigned_device to look up interrupt invalidati…

…on targets

Stop using the virtual device list which will be removed eventually and
switch to the pci_get_assigned_device service. It is a bit slower than
the current approach, but we don't consider the emulation of interrupt
invalidation requests as fast path. On the positive side, this change
will allow to simplify the PCI layer a bit.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

hypervisor/arch/x86/vtd.c

@@ -1,7 +1,7 @@
 /*
  * Jailhouse, a Linux-based partitioning hypervisor
  *
- * Copyright (c) Siemens AG, 2013, 2014
+ * Copyright (c) Siemens AG, 2013-2015
  * Copyright (c) Valentine Sinitsyn, 2014
  *
  * Authors:
@@ -265,11 +265,9 @@ static int vtd_emulate_inv_int(unsigned int unit_no, unsigned int index)
 	if (!irte_usage->used)
 		return 0;
 
-	/* check all virtual PCI devices first */
-	for (device = root_cell.virtual_device_list; device;
-	     device = device->next_virtual_device)
-		if (device->info->bdf == irte_usage->device_id)
-			return pci_ivshmem_update_msix(device);
+	device = pci_get_assigned_device(&root_cell, irte_usage->device_id);
+	if (device && device->info->type == JAILHOUSE_PCI_TYPE_IVSHMEM)
+		return pci_ivshmem_update_msix(device);
 
 	irq_msg = iommu_get_remapped_root_int(unit_no, irte_usage->device_id,
 					      irte_usage->vector, index);