[PATCH 7/7] pc: add floppy=OnOffAuto

[Gerd Hoffmann <kraxel@redhat.com>]

Allows to enable/disable the floppy controller.  Default depends on
MachineClass->no_floppy.  It's ON for now, but we can flip the default
for 6.2+ machine types.

NOTE: This requires -nodefaults or no_floppy=1 to actually have an
effect.  Otherwise the default floppy drive created by qemu will
auto-enable the floppy controller.  Not sure how to deal with that best.
IMHO we should simply stop creating a default floppy, unfortunaly
that will break live migration.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 include/hw/i386/pc.h |  2 ++
 hw/i386/pc.c         | 23 +++++++++++++++++++++++
 hw/i386/pc_piix.c    |  8 +++++++-
 3 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 88dffe751724..b418ead6c260 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -38,6 +38,7 @@ typedef struct PCMachineState {
     /* Configuration options: */
     uint64_t max_ram_below_4g;
     OnOffAuto vmport;
+    OnOffAuto floppy;
 
     bool acpi_build_enabled;
     bool smbus_enabled;
@@ -59,6 +60,7 @@ typedef struct PCMachineState {
 #define PC_MACHINE_MAX_RAM_BELOW_4G "max-ram-below-4g"
 #define PC_MACHINE_DEVMEM_REGION_SIZE "device-memory-region-size"
 #define PC_MACHINE_VMPORT           "vmport"
+#define PC_MACHINE_FLOPPY           "floppy"
 #define PC_MACHINE_SMBUS            "smbus"
 #define PC_MACHINE_SATA             "sata"
 #define PC_MACHINE_PIT              "pit"
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index c2b9d62a358f..832ea9cc8ef8 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1468,6 +1468,23 @@ static void pc_machine_set_vmport(Object *obj, Visitor *v, const char *name,
     visit_type_OnOffAuto(v, name, &pcms->vmport, errp);
 }
 
+static void pc_machine_get_floppy(Object *obj, Visitor *v, const char *name,
+                                  void *opaque, Error **errp)
+{
+    PCMachineState *pcms = PC_MACHINE(obj);
+    OnOffAuto floppy = pcms->floppy;
+
+    visit_type_OnOffAuto(v, name, &floppy, errp);
+}
+
+static void pc_machine_set_floppy(Object *obj, Visitor *v, const char *name,
+                                  void *opaque, Error **errp)
+{
+    PCMachineState *pcms = PC_MACHINE(obj);
+
+    visit_type_OnOffAuto(v, name, &pcms->floppy, errp);
+}
+
 static bool pc_machine_get_smbus(Object *obj, Error **errp)
 {
     PCMachineState *pcms = PC_MACHINE(obj);
@@ -1751,6 +1768,12 @@ static void pc_machine_class_init(ObjectClass *oc, void *data)
     object_class_property_set_description(oc, PC_MACHINE_VMPORT,
         "Enable vmport (pc & q35)");
 
+    object_class_property_add(oc, PC_MACHINE_FLOPPY, "OnOffAuto",
+        pc_machine_get_floppy, pc_machine_set_floppy,
+        NULL, NULL);
+    object_class_property_set_description(oc, PC_MACHINE_FLOPPY,
+        "Enable floppy (pc only)");
+
     object_class_property_add_bool(oc, PC_MACHINE_SMBUS,
         pc_machine_get_smbus, pc_machine_set_smbus);
 
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 30b8bd6ea92d..7f81729e42cd 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -235,8 +235,14 @@ static void pc_init1(MachineState *machine,
         pcms->vmport = xen_enabled() ? ON_OFF_AUTO_OFF : ON_OFF_AUTO_ON;
     }
 
+    if (pcms->floppy == ON_OFF_AUTO_AUTO) {
+        pcms->floppy = MACHINE_CLASS(pcmc)->no_floppy
+            ? ON_OFF_AUTO_OFF : ON_OFF_AUTO_ON;
+    }
+
     /* init basic PC hardware */
-    pc_basic_device_init(pcms, isa_bus, x86ms->gsi, &rtc_state, true,
+    pc_basic_device_init(pcms, isa_bus, x86ms->gsi, &rtc_state,
+                         pcms->floppy == ON_OFF_AUTO_ON,
                          0x4);
 
     pc_nic_init(pcmc, isa_bus, pci_bus);
-- 
2.31.1