PCI Express does not allow hot-plug on pcie.0. Check for Q35 in
acpi_pcihp_disable_root_bus() to be able to forbid hot-plug using the
'acpi-root-pci-hotplug' flag.

Signed-off-by: Julia Suvorova <jusual@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
---
 hw/acpi/pcihp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hw/acpi/pcihp.c b/hw/acpi/pcihp.c
index 4999277d57..09f531e941 100644
--- a/hw/acpi/pcihp.c
+++ b/hw/acpi/pcihp.c
@@ -122,13 +122,14 @@ static void acpi_set_pci_info(void)
 static void acpi_pcihp_disable_root_bus(void)
 {
     static bool root_hp_disabled;
+    Object *host = acpi_get_i386_pci_host();
     PCIBus *bus;
 
     if (root_hp_disabled) {
         return;
     }
 
-    bus = find_i440fx();
+    bus = PCI_HOST_BRIDGE(host)->bus;
     if (bus) {
         /* setting the hotplug handler to NULL makes the bus non-hotpluggable */
         qbus_set_hotplug_handler(BUS(bus), NULL);
-- 
2.30.2