ppc/pnv: Remove user-created PHB{3,4,5} devices

On a real system with POWER{8,9,10} processors, PHBs are sub-units of
the processor, they can be deactivated by firmware but not plugged in
or out like a PCI adapter on a slot. Nevertheless, having user-created
PHBs in QEMU seemed to be a good idea for testing purposes :

 1. having a limited set of PHBs speedups boot time.
 2. it is useful to be able to mimic a partially broken topology you
    some time have to deal with during bring-up.

PowerNV is also used for distro install tests and having libvirt
support eases these tasks. libvirt prefers to run the machine with
-nodefaults to be sure not to drag unexpected devices which would need
to be defined in the domain file without being specified on the QEMU
command line. For this reason :

 3. -nodefaults should not include default PHBs

User-created PHB{3,4,5} devices satisfied all these needs but reality
proves to be a bit more complex, internally when modeling such
devices, and externally when dealing with the user interface.

Req 1. and 2. can be simply addressed differently with a machine option:
"phb-mask=<uint>", which QEMU would use to enable/disable PHB device
nodes when creating the device tree.

For Req 3., we need to make sure we are taking the right approach. It
seems that we should expose a new type of user-created PHB device, a
generic virtualized one, that libvirt would use and not one depending
on the processor revision. This needs more thinking.

For now, remove user-created PHB{3,4,5} devices. All the cleanups we
did are not lost and they will be useful for the next steps.

Fixes: 5bc67b052b51 ("ppc/pnv: Introduce user creatable pnv-phb4 devices")
Fixes: 1f6a88fffc75 ("ppc/pnv: Introduce support for user created PHB3 devices")
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Frederic Barrat <fbarrat@linux.ibm.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20220314130514.529931-1-clg@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

1 files changed, 1 insertions, 24 deletions

diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index e7cd8b62ca..00f57c9678 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -1141,9 +1141,7 @@ static void pnv_chip_power8_instance_init(Object *obj)
 
     object_initialize_child(obj, "homer", &chip8->homer, TYPE_PNV8_HOMER);
 
-    if (defaults_enabled()) {
-        chip8->num_phbs = pcc->num_phbs;
-    }
+    chip8->num_phbs = pcc->num_phbs;
 
     for (i = 0; i < chip8->num_phbs; i++) {
         object_initialize_child(obj, "phb[*]", &chip8->phbs[i], TYPE_PNV_PHB3);
@@ -1974,23 +1972,6 @@ static ICSState *pnv_ics_get(XICSFabric *xi, int irq)
     return NULL;
 }
 
-void pnv_chip_parent_fixup(PnvChip *chip, Object *obj, int index)
-{
-    Object *parent = OBJECT(chip);
-    g_autofree char *default_id =
-        g_strdup_printf("%s[%d]", object_get_typename(obj), index);
-
-    if (obj->parent == parent) {
-        return;
-    }
-
-    object_ref(obj);
-    object_unparent(obj);
-    object_property_add_child(
-        parent, DEVICE(obj)->id ? DEVICE(obj)->id : default_id, obj);
-    object_unref(obj);
-}
-
 PnvChip *pnv_get_chip(PnvMachineState *pnv, uint32_t chip_id)
 {
     int i;
@@ -2130,8 +2111,6 @@ static void pnv_machine_power8_class_init(ObjectClass *oc, void *data)
 
     pmc->compat = compat;
     pmc->compat_size = sizeof(compat);
-
-    machine_class_allow_dynamic_sysbus_dev(mc, TYPE_PNV_PHB3);
 }
 
 static void pnv_machine_power9_class_init(ObjectClass *oc, void *data)
@@ -2150,8 +2129,6 @@ static void pnv_machine_power9_class_init(ObjectClass *oc, void *data)
     pmc->compat = compat;
     pmc->compat_size = sizeof(compat);
     pmc->dt_power_mgt = pnv_dt_power_mgt;
-
-    machine_class_allow_dynamic_sysbus_dev(mc, TYPE_PNV_PHB4);
 }
 
 static void pnv_machine_power10_class_init(ObjectClass *oc, void *data)