x86: add support for second ioapic

Add ioapic_init_secondary to initialize it, wire up
in gsi handling and acpi apic table creation.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Sergio Lopez <slp@redhat.com>
Message-id: 20201203105423.10431-4-kraxel@redhat.com

hw/i386/acpi-common.c

@@ -103,6 +103,16 @@ void acpi_build_madt(GArray *table_data, BIOSLinker *linker,
     io_apic->address = cpu_to_le32(IO_APIC_DEFAULT_ADDRESS);
     io_apic->interrupt = cpu_to_le32(0);
 
+    if (x86ms->ioapic2) {
+        AcpiMadtIoApic *io_apic2;
+        io_apic2 = acpi_data_push(table_data, sizeof *io_apic);
+        io_apic2->type = ACPI_APIC_IO;
+        io_apic2->length = sizeof(*io_apic);
+        io_apic2->io_apic_id = ACPI_BUILD_IOAPIC_ID + 1;
+        io_apic2->address = cpu_to_le32(IO_APIC_SECONDARY_ADDRESS);
+        io_apic2->interrupt = cpu_to_le32(IO_APIC_SECONDARY_IRQBASE);
+    }
+
     if (x86ms->apic_xrupt_override) {
         intsrcovr = acpi_data_push(table_data, sizeof *intsrcovr);
         intsrcovr->type   = ACPI_APIC_XRUPT_OVERRIDE;

hw/i386/x86.c

@@ -598,6 +598,10 @@ void gsi_handler(void *opaque, int n, int level)
     case ISA_NUM_IRQS ... IOAPIC_NUM_PINS - 1:
         qemu_set_irq(s->ioapic_irq[n], level);
         break;
+    case IO_APIC_SECONDARY_IRQBASE
+        ... IO_APIC_SECONDARY_IRQBASE + IOAPIC_NUM_PINS - 1:
+        qemu_set_irq(s->ioapic2_irq[n - IO_APIC_SECONDARY_IRQBASE], level);
+        break;
     }
 }
 
@@ -624,6 +628,23 @@ void ioapic_init_gsi(GSIState *gsi_state, const char *parent_name)
     }
 }
 
+DeviceState *ioapic_init_secondary(GSIState *gsi_state)
+{
+    DeviceState *dev;
+    SysBusDevice *d;
+    unsigned int i;
+
+    dev = qdev_new(TYPE_IOAPIC);
+    d = SYS_BUS_DEVICE(dev);
+    sysbus_realize_and_unref(d, &error_fatal);
+    sysbus_mmio_map(d, 0, IO_APIC_SECONDARY_ADDRESS);
+
+    for (i = 0; i < IOAPIC_NUM_PINS; i++) {
+        gsi_state->ioapic2_irq[i] = qdev_get_gpio_in(dev, i);
+    }
+    return dev;
+}
+
 struct setup_data {
     uint64_t next;
     uint32_t type;

include/hw/i386/ioapic.h

@@ -22,6 +22,8 @@
 
 #define IOAPIC_NUM_PINS 24
 #define IO_APIC_DEFAULT_ADDRESS 0xfec00000
+#define IO_APIC_SECONDARY_ADDRESS (IO_APIC_DEFAULT_ADDRESS + 0x10000)
+#define IO_APIC_SECONDARY_IRQBASE 24 /* primary 0 -> 23, secondary 24 -> 47 */
 
 #define TYPE_KVM_IOAPIC "kvm-ioapic"
 #define TYPE_IOAPIC "ioapic"

include/hw/i386/ioapic_internal.h

@@ -27,7 +27,7 @@
 #include "qemu/notify.h"
 #include "qom/object.h"
 
-#define MAX_IOAPICS                     1
+#define MAX_IOAPICS                     2
 
 #define IOAPIC_LVT_DEST_SHIFT           56
 #define IOAPIC_LVT_DEST_IDX_SHIFT       48

include/hw/i386/x86.h

@@ -50,6 +50,7 @@ struct X86MachineState {
     ISADevice *rtc;
     FWCfgState *fw_cfg;
     qemu_irq *gsi;
+    DeviceState *ioapic2;
     GMappedFile *initrd_mapped_file;
     HotplugHandler *acpi_dev;
 
@@ -120,10 +121,12 @@ bool x86_machine_is_acpi_enabled(const X86MachineState *x86ms);
 typedef struct GSIState {
     qemu_irq i8259_irq[ISA_NUM_IRQS];
     qemu_irq ioapic_irq[IOAPIC_NUM_PINS];
+    qemu_irq ioapic2_irq[IOAPIC_NUM_PINS];
 } GSIState;
 
 qemu_irq x86_allocate_cpu_irq(void);
 void gsi_handler(void *opaque, int n, int level);
 void ioapic_init_gsi(GSIState *gsi_state, const char *parent_name);
+DeviceState *ioapic_init_secondary(GSIState *gsi_state);
 
 #endif