hw/acpi/pcihp: Remove root arg in acpi_pcihp_init

Let pass the root bus to ich9 and piix4 through a property link
instead of through an argument passed to acpi_pcihp_init().

Also make sure the root bus is set at the entry of acpi_pcihp_init().

The rationale of that change is to be consistent with the forecoming ARM
implementation where the machine passes the root bus (steming from GPEX)
to the GED device through a link property.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Suggested-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20250714080639.2525563-28-eric.auger@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/hw/acpi/pcihp.c b/hw/acpi/pcihp.c
index f1594e664a..4922bbc778 100644
--- a/hw/acpi/pcihp.c
+++ b/hw/acpi/pcihp.c
@@ -493,13 +493,13 @@ static const MemoryRegionOps acpi_pcihp_io_ops = {
     },
 };
 
-void acpi_pcihp_init(Object *owner, AcpiPciHpState *s, PCIBus *root_bus,
+void acpi_pcihp_init(Object *owner, AcpiPciHpState *s,
                      MemoryRegion *io, uint16_t io_base)
 {
     s->io_len = ACPI_PCIHP_SIZE;
     s->io_base = io_base;
 
-    s->root = root_bus;
+    assert(s->root);
 
     memory_region_init_io(&s->io, owner, &acpi_pcihp_io_ops, s,
                           "acpi-pci-hotplug", s->io_len);