[Qemu-devel] [PATCH 2/2] acpi-build: skip hotplugged bridges

["Michael S. Tsirkin" <mst@redhat.com>]

hotplugged bridges don't get bsel allocated so acpi hotplug doesn't work
for them anyway.  OTOH adding them in ACPI creates a host of problems,
e.g. they can't be hot-unplugged themselves which is surprising to
users.

So let's just skip these.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/i386/acpi-build.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 74586f3..ff42de5 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -857,8 +857,10 @@ static void build_pci_bus_end(PCIBus *bus, void *bus_state)
     /*
      * Skip bridge subtree creation if bridge hotplug is disabled
      * to make acpi tables compatible with legacy machine types.
+     * Skip creation for hotplugged bridges as well.
      */
-    if (!child->pcihp_bridge_en && bus->parent_dev) {
+    if (bus->parent_dev && (!child->pcihp_bridge_en ||
+                            DEVICE(bus->parent_dev)->hotplugged)) {
         build_free_array(bus_table);
         build_pci_bus_state_cleanup(child);
         g_free(child);
@@ -915,8 +917,10 @@ static void build_pci_bus_end(PCIBus *bus, void *bus_state)
         /* When hotplug for bridges is enabled, bridges are
          * described in ACPI separately (see build_pci_bus_end).
          * In this case they aren't themselves hot-pluggable.
+         * Hotplugged bridges *are* hot-pluggable.
          */
-        bridge_in_acpi = pc->is_bridge && child->pcihp_bridge_en;
+        bridge_in_acpi = pc->is_bridge && child->pcihp_bridge_en &&
+         !DEVICE(pdev)->hotplugged;
 
         if (pc->class_id == PCI_CLASS_BRIDGE_ISA || bridge_in_acpi) {
             set_bit(slot, slot_device_system);
-- 
MST