iommu/vt-d: Use Real PCI DMA device for IRTE

VMD retransmits child device MSI-X with the VMD endpoint's requester-id.
In order to support direct interrupt remapping of VMD child devices,
ensure that the IRTE is programmed with the VMD endpoint's requester-id
using pci_real_dma_dev().

Link: https://lore.kernel.org/r/20210210161315.316097-2-jonathan.derrick@intel.com
Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
Acked-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/intel/irq_remapping.c b/drivers/iommu/intel/irq_remapping.c
index 611ef5243cb63b9872c29108a77eade4957ef93e..75429a5373ec91db5c0106b66652fc6c17952128 100644 (file)
--- a/drivers/iommu/intel/irq_remapping.c
+++ b/drivers/iommu/intel/irq_remapping.c
@@ -1280,7 +1280,8 @@ static void intel_irq_remapping_prepare_irte(struct intel_ir_data *data,
                break;
        case X86_IRQ_ALLOC_TYPE_PCI_MSI:
        case X86_IRQ_ALLOC_TYPE_PCI_MSIX:
-               set_msi_sid(irte, msi_desc_to_pci_dev(info->desc));
+               set_msi_sid(irte,
+                           pci_real_dma_dev(msi_desc_to_pci_dev(info->desc)));
                break;
        default:
                BUG_ON(1);