hw/arm/virt-acpi-build: Add GICv2m description in ACPI MADT table

Add GICv2m description in ACPI MADT table, so guest can use MSI when
booting with ACPI.

Signed-off-by: Shannon Zhao <zhaoshenglong@huawei.com>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Tested-by: Andrew Jones <drjones@redhat.com>
Message-id: 1434676210-2276-1-git-send-email-shannon.zhao@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/arm/virt-acpi-build.c

@@ -423,8 +423,10 @@ build_madt(GArray *table_data, GArray *linker, VirtGuestInfo *guest_info,
 {
     int madt_start = table_data->len;
     const MemMapEntry *memmap = guest_info->memmap;
+    const int *irqmap = guest_info->irqmap;
     AcpiMultipleApicTable *madt;
     AcpiMadtGenericDistributor *gicd;
+    AcpiMadtGenericMsiFrame *gic_msi;
     int i;
 
     madt = acpi_data_push(table_data, sizeof *madt);
@@ -448,6 +450,15 @@ build_madt(GArray *table_data, GArray *linker, VirtGuestInfo *guest_info,
     gicd->length = sizeof(*gicd);
     gicd->base_address = memmap[VIRT_GIC_DIST].base;
 
+    gic_msi = acpi_data_push(table_data, sizeof *gic_msi);
+    gic_msi->type = ACPI_APIC_GENERIC_MSI_FRAME;
+    gic_msi->length = sizeof(*gic_msi);
+    gic_msi->gic_msi_frame_id = 0;
+    gic_msi->base_address = cpu_to_le64(memmap[VIRT_GIC_V2M].base);
+    gic_msi->flags = cpu_to_le32(1);
+    gic_msi->spi_count = cpu_to_le16(NUM_GICV2M_SPIS);
+    gic_msi->spi_base = cpu_to_le16(irqmap[VIRT_GIC_V2M] + ARM_SPI_BASE);
+
     build_header(linker, table_data,
                  (void *)(table_data->data + madt_start), "APIC",
                  table_data->len - madt_start, 3);

include/hw/acpi/acpi-defs.h

@@ -372,6 +372,18 @@ struct AcpiMadtGenericDistributor {
 
 typedef struct AcpiMadtGenericDistributor AcpiMadtGenericDistributor;
 
+struct AcpiMadtGenericMsiFrame {
+    ACPI_SUB_HEADER_DEF
+    uint16_t reserved;
+    uint32_t gic_msi_frame_id;
+    uint64_t base_address;
+    uint32_t flags;
+    uint16_t spi_count;
+    uint16_t spi_base;
+} QEMU_PACKED;
+
+typedef struct AcpiMadtGenericMsiFrame AcpiMadtGenericMsiFrame;
+
 /*
  * Generic Timer Description Table (GTDT)
  */