ARM: Virt: ACPI: Add GIC ITS description in ACPI MADT table

If GIC ITS is supported, add description in ACPI MADT table, then guest
could use ITS when booting with ACPI.

Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Message-id: 1474616617-366-9-git-send-email-eric.auger@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/arm/virt-acpi-build.c

@@ -44,6 +44,7 @@
 #include "hw/pci/pcie_host.h"
 #include "hw/pci/pci.h"
 #include "sysemu/numa.h"
+#include "kvm_arm.h"
 
 #define ARM_SPI_BASE 32
 #define ACPI_POWER_BUTTON_DEVICE "PWRB"
@@ -546,6 +547,7 @@ build_madt(GArray *table_data, BIOSLinker *linker, VirtGuestInfo *guest_info)
     }
 
     if (guest_info->gic_version == 3) {
+        AcpiMadtGenericTranslator *gic_its;
         AcpiMadtGenericRedistributor *gicr = acpi_data_push(table_data,
                                                          sizeof *gicr);
 
@@ -553,6 +555,16 @@ build_madt(GArray *table_data, BIOSLinker *linker, VirtGuestInfo *guest_info)
         gicr->length = sizeof(*gicr);
         gicr->base_address = cpu_to_le64(memmap[VIRT_GIC_REDIST].base);
         gicr->range_length = cpu_to_le32(memmap[VIRT_GIC_REDIST].size);
+
+        if (!its_class_name()) {
+            return;
+        }
+
+        gic_its = acpi_data_push(table_data, sizeof *gic_its);
+        gic_its->type = ACPI_APIC_GENERIC_TRANSLATOR;
+        gic_its->length = sizeof(*gic_its);
+        gic_its->translation_id = 0;
+        gic_its->base_address = cpu_to_le64(memmap[VIRT_GIC_ITS].base);
     } else {
         gic_msi = acpi_data_push(table_data, sizeof *gic_msi);
         gic_msi->type = ACPI_APIC_GENERIC_MSI_FRAME;