[PULL v3 41/62] hw/isa/piix: Allow for optional PIC creation in PIIX3

[Michael S. Tsirkin]

From: Bernhard Beschow <shentey@gmail.com>

In the PC machine, the PIC is created in board code to allow it to be
virtualized with various virtualization techniques. So explicitly disable its
creation in the PC machine via a property which defaults to enabled. Once the
PIIX implementations are consolidated this default will keep Malta working
without further ado.

Signed-off-by: Bernhard Beschow <shentey@gmail.com>
Message-Id: <20231007123843.127151-21-shentey@gmail.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 include/hw/southbridge/piix.h |  1 +
 hw/i386/pc_piix.c             |  2 ++
 hw/isa/piix.c                 | 21 +++++++++++++++++++--
 3 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/include/hw/southbridge/piix.h b/include/hw/southbridge/piix.h
index dd5f7b31c0..08491693b4 100644
--- a/include/hw/southbridge/piix.h
+++ b/include/hw/southbridge/piix.h
@@ -69,6 +69,7 @@ struct PIIXState {
     MemoryRegion rcr_mem;
 
     bool has_acpi;
+    bool has_pic;
     bool has_usb;
     bool smm_enabled;
 };
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 70cffcfe4f..fa39afd891 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -268,6 +268,8 @@ static void pc_init1(MachineState *machine,
         object_property_set_bool(OBJECT(pci_dev), "has-acpi",
                                  x86_machine_is_acpi_enabled(x86ms),
                                  &error_abort);
+        object_property_set_bool(OBJECT(pci_dev), "has-pic", false,
+                                 &error_abort);
         qdev_prop_set_uint32(DEVICE(pci_dev), "smb_io_base", 0xb100);
         object_property_set_bool(OBJECT(pci_dev), "smm-enabled",
                                  x86_machine_is_smm_enabled(x86ms),
diff --git a/hw/isa/piix.c b/hw/isa/piix.c
index f6da334c6f..d6d9ac6473 100644
--- a/hw/isa/piix.c
+++ b/hw/isa/piix.c
@@ -106,7 +106,7 @@ static void piix4_set_irq(void *opaque, int irq_num, int 
level)
     }
 }
 
-static void piix4_request_i8259_irq(void *opaque, int irq, int level)
+static void piix_request_i8259_irq(void *opaque, int irq, int level)
 {
     PIIX4State *s = opaque;
     qemu_set_irq(s->cpu_intr, level);
@@ -343,6 +343,22 @@ static void pci_piix3_realize(PCIDevice *dev, Error **errp)
     memory_region_add_subregion_overlap(pci_address_space_io(dev),
                                         PIIX_RCR_IOPORT, &d->rcr_mem, 1);
 
+    /* PIC */
+    if (d->has_pic) {
+        qemu_irq *i8259_out_irq = qemu_allocate_irqs(piix_request_i8259_irq, d,
+                                                     1);
+        qemu_irq *i8259 = i8259_init(isa_bus, *i8259_out_irq);
+        size_t i;
+
+        for (i = 0; i < ISA_NUM_IRQS; i++) {
+            d->isa_irqs_in[i] = i8259[i];
+        }
+
+        g_free(i8259);
+
+        qdev_init_gpio_out_named(DEVICE(dev), &d->cpu_intr, "intr", 1);
+    }
+
     isa_bus_register_input_irqs(isa_bus, d->isa_irqs_in);
 
     i8257_dma_init(isa_bus, 0);
@@ -419,6 +435,7 @@ static void pci_piix3_init(Object *obj)
 static Property pci_piix3_props[] = {
     DEFINE_PROP_UINT32("smb_io_base", PIIXState, smb_io_base, 0),
     DEFINE_PROP_BOOL("has-acpi", PIIXState, has_acpi, true),
+    DEFINE_PROP_BOOL("has-pic", PIIXState, has_pic, true),
     DEFINE_PROP_BOOL("has-usb", PIIXState, has_usb, true),
     DEFINE_PROP_BOOL("smm-enabled", PIIXState, smm_enabled, false),
     DEFINE_PROP_END_OF_LIST(),
@@ -514,7 +531,7 @@ static void piix4_realize(PCIDevice *dev, Error **errp)
                                         PIIX_RCR_IOPORT, &s->rcr_mem, 1);
 
     /* initialize i8259 pic */
-    i8259_out_irq = qemu_allocate_irqs(piix4_request_i8259_irq, s, 1);
+    i8259_out_irq = qemu_allocate_irqs(piix_request_i8259_irq, s, 1);
     i8259 = i8259_init(isa_bus, *i8259_out_irq);
 
     for (i = 0; i < ISA_NUM_IRQS; i++) {
-- 
MST