Merge branch 'remotes/lorenzo/pci/vmd'

- Assign VMD IRQ domain before enumeration to avoid IOMMU interrupt
  remapping errors when MSI-X remapping is disabled (Nirmal Patel)

- Revert VMD workaround that kept MSI-X remapping enabled when IOMMU
  remapping was enabled (Nirmal Patel)

* remotes/lorenzo/pci/vmd:
  PCI: vmd: Revert 2565e5b ("PCI: vmd: Do not disable MSI-X remapping if interrupt remapping is enabled by IOMMU.")
  PCI: vmd: Assign VMD IRQ domain before enumeration

Author: bjorn-helgaas

drivers/pci/controller/vmd.c

@@ -6,7 +6,6 @@
 
 #include <linux/device.h>
 #include <linux/interrupt.h>
-#include <linux/iommu.h>
 #include <linux/irq.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
@@ -813,8 +812,7 @@ static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features)
 	 * acceptable because the guest is usually CPU-limited and MSI
 	 * remapping doesn't become a performance bottleneck.
 	 */
-	if (iommu_capable(vmd->dev->dev.bus, IOMMU_CAP_INTR_REMAP) ||
-	    !(features & VMD_FEAT_CAN_BYPASS_MSI_REMAP) ||
+	if (!(features & VMD_FEAT_CAN_BYPASS_MSI_REMAP) ||
 	    offset[0] || offset[1]) {
 		ret = vmd_alloc_irqs(vmd);
 		if (ret)
@@ -853,6 +851,9 @@ static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features)
 	vmd_attach_resources(vmd);
 	if (vmd->irq_domain)
 		dev_set_msi_domain(&vmd->bus->dev, vmd->irq_domain);
+	else
+		dev_set_msi_domain(&vmd->bus->dev,
+				   dev_get_msi_domain(&vmd->dev->dev));
 
 	vmd_acpi_begin();