[PATCH 3/4] microvm: add second ioapic

[Gerd Hoffmann <kraxel@redhat.com>]

Add more IRQ lines.  Depends on ACPI.
Also enable this only with userspace ioapic,
not sure whenever the kernel can handle two ioapics.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 include/hw/i386/ioapic_internal.h |  2 +-
 include/hw/i386/x86.h             |  1 +
 hw/i386/acpi-common.c             | 10 ++++++++++
 hw/i386/microvm.c                 | 30 ++++++++++++++++++++++++++++--
 4 files changed, 40 insertions(+), 3 deletions(-)

diff --git a/include/hw/i386/ioapic_internal.h b/include/hw/i386/ioapic_internal.h
index 0ac9e2400d6b..4cebd2e32c9f 100644
--- a/include/hw/i386/ioapic_internal.h
+++ b/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
diff --git a/include/hw/i386/x86.h b/include/hw/i386/x86.h
index bfa9cb2a258b..6da57033a875 100644
--- a/include/hw/i386/x86.h
+++ b/include/hw/i386/x86.h
@@ -120,6 +120,7 @@ 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);
diff --git a/hw/i386/acpi-common.c b/hw/i386/acpi-common.c
index 8a769654060e..f0689392a39f 100644
--- a/hw/i386/acpi-common.c
+++ b/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 (object_property_find(OBJECT(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_DEFAULT_ADDRESS + 0x10000);
+        io_apic2->interrupt = cpu_to_le32(24);
+    }
+
     if (x86ms->apic_xrupt_override) {
         intsrcovr = acpi_data_push(table_data, sizeof *intsrcovr);
         intsrcovr->type   = ACPI_APIC_XRUPT_OVERRIDE;
diff --git a/hw/i386/microvm.c b/hw/i386/microvm.c
index 638e95c39e8c..15c3e078a4aa 100644
--- a/hw/i386/microvm.c
+++ b/hw/i386/microvm.c
@@ -99,7 +99,11 @@ static void microvm_gsi_handler(void *opaque, int n, int level)
 {
     GSIState *s = opaque;
 
-    qemu_set_irq(s->ioapic_irq[n], level);
+    if (n >= 24) {
+        qemu_set_irq(s->ioapic2_irq[n - 24], level);
+    } else {
+        qemu_set_irq(s->ioapic_irq[n], level);
+    }
 }
 
 static void create_gpex(MicrovmMachineState *mms)
@@ -157,6 +161,7 @@ static void microvm_devices_init(MicrovmMachineState *mms)
     ISABus *isa_bus;
     ISADevice *rtc_state;
     GSIState *gsi_state;
+    bool ioapic2 = false;
     int i;
 
     /* Core components */
@@ -165,8 +170,13 @@ static void microvm_devices_init(MicrovmMachineState *mms)
     if (mms->pic == ON_OFF_AUTO_ON || mms->pic == ON_OFF_AUTO_AUTO) {
         x86ms->gsi = qemu_allocate_irqs(gsi_handler, gsi_state, GSI_NUM_PINS);
     } else {
+        int pins = GSI_NUM_PINS;
+        if (!kvm_ioapic_in_kernel() && x86_machine_is_acpi_enabled(x86ms)) {
+            ioapic2 = true;
+            pins += 24;
+        }
         x86ms->gsi = qemu_allocate_irqs(microvm_gsi_handler,
-                                        gsi_state, GSI_NUM_PINS);
+                                        gsi_state, pins);
     }
 
     isa_bus = isa_bus_new(NULL, get_system_memory(), get_system_io(),
@@ -175,6 +185,22 @@ static void microvm_devices_init(MicrovmMachineState *mms)
 
     ioapic_init_gsi(gsi_state, "machine");
 
+    if (ioapic2) {
+        DeviceState *dev;
+        SysBusDevice *d;
+        unsigned int i;
+
+        dev = qdev_new(TYPE_IOAPIC);
+        object_property_add_child(OBJECT(mms), "ioapic2", OBJECT(dev));
+        d = SYS_BUS_DEVICE(dev);
+        sysbus_realize_and_unref(d, &error_fatal);
+        sysbus_mmio_map(d, 0, IO_APIC_DEFAULT_ADDRESS + 0x10000);
+
+        for (i = 0; i < IOAPIC_NUM_PINS; i++) {
+            gsi_state->ioapic2_irq[i] = qdev_get_gpio_in(dev, i);
+        }
+    }
+
     kvmclock_create(true);
 
     mms->virtio_irq_base = 5;
-- 
2.27.0