[PATCH 5/6] pc: Add VIOT table for virtio-iommu

[Jean-Philippe Brucker <jean-philippe@linaro.org>]

The ACPI Virtual I/O Translation table (VIOT) describes the relation
between a virtio-iommu and the endpoints it manages. When a virtio-iommu
device is instantiated, add a VIOT table.

Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
---
 include/hw/i386/pc.h | 2 ++
 hw/i386/acpi-build.c | 5 +++++
 hw/i386/pc.c         | 7 +++++++
 hw/i386/Kconfig      | 1 +
 4 files changed, 15 insertions(+)

diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 88dffe7517..979b8d0b7c 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -45,6 +45,8 @@ typedef struct PCMachineState {
     bool pit_enabled;
     bool hpet_enabled;
     bool default_bus_bypass_iommu;
+    bool virtio_iommu;
+    uint16_t virtio_iommu_bdf;
     uint64_t max_fw_size;
 
     /* NUMA information: */
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index a33ac8b91e..078b7f5c6f 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -71,6 +71,7 @@
 
 #include "hw/acpi/ipmi.h"
 #include "hw/acpi/hmat.h"
+#include "hw/acpi/viot.h"
 
 /* These are used to size the ACPI tables for -M pc-i440fx-1.7 and
  * -M pc-i440fx-2.0.  Even if the actual amount of AML generated grows
@@ -2559,6 +2560,10 @@ void acpi_build(AcpiBuildTables *tables, MachineState *machine)
             build_dmar_q35(tables_blob, tables->linker, x86ms->oem_id,
                            x86ms->oem_table_id);
         }
+    } else if (pcms->virtio_iommu) {
+        acpi_add_table(table_offsets, tables_blob);
+        build_viot(tables_blob, tables->linker, pcms->virtio_iommu_bdf,
+                   x86ms->oem_id, x86ms->oem_table_id);
     }
     if (machine->nvdimms_state->is_enabled) {
         nvdimm_build_acpi(table_offsets, tables_blob, tables->linker,
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index c2b9d62a35..694fc9ce07 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -84,6 +84,7 @@
 #include "hw/i386/intel_iommu.h"
 #include "hw/net/ne2000-isa.h"
 #include "standard-headers/asm-x86/bootparam.h"
+#include "hw/virtio/virtio-iommu.h"
 #include "hw/virtio/virtio-pmem-pci.h"
 #include "hw/virtio/virtio-mem-pci.h"
 #include "hw/mem/memory-device.h"
@@ -1388,6 +1389,12 @@ static void pc_machine_device_plug_cb(HotplugHandler *hotplug_dev,
     } else if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_PMEM_PCI) ||
                object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_MEM_PCI)) {
         pc_virtio_md_pci_plug(hotplug_dev, dev, errp);
+    } else if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_IOMMU_PCI)) {
+        PCMachineState *pcms = PC_MACHINE(hotplug_dev);
+        PCIDevice *pdev = PCI_DEVICE(dev);
+
+        pcms->virtio_iommu = true;
+        pcms->virtio_iommu_bdf = pci_get_bdf(pdev);
     }
 }
 
diff --git a/hw/i386/Kconfig b/hw/i386/Kconfig
index ddedcef0b2..13db05d557 100644
--- a/hw/i386/Kconfig
+++ b/hw/i386/Kconfig
@@ -54,6 +54,7 @@ config PC_ACPI
     select ACPI_X86
     select ACPI_CPU_HOTPLUG
     select ACPI_MEMORY_HOTPLUG
+    select ACPI_VIOT
     select SMBUS_EEPROM
     select PFLASH_CFI01
     depends on ACPI_SMBUS
-- 
2.32.0