[Xen-devel] [RFC PATCH 14/30] pc/q35: Apply PCI bus BSEL property for Xen PCI device hotplug

[Alexey Gerasimenko <x1917x@xxxxxxxxx>]

On Q35 we still need to assign BSEL property to bus(es) for PCI device
add/hotplug to work.
Extend acpi_set_pci_info() function to support Q35 as well. Previously
it was limited to find_i440fx() call, this patch adds new (trivial)
function find_q35() which returns root PCIBus object on Q35, in a way
similar to what find_i440fx does.

Signed-off-by: Alexey Gerasimenko <x1917x@xxxxxxxxx>
---
 hw/acpi/pcihp.c      | 6 +++++-
 hw/pci-host/q35.c    | 8 ++++++++
 include/hw/i386/pc.h | 3 +++
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/hw/acpi/pcihp.c b/hw/acpi/pcihp.c
index 91c82fdc7a..f70d8620d7 100644
--- a/hw/acpi/pcihp.c
+++ b/hw/acpi/pcihp.c
@@ -105,7 +105,11 @@ static void acpi_set_pci_info(void)
     }
     bsel_is_set = true;
 
-    bus = find_i440fx(); /* TODO: Q35 support */
+    bus = find_i440fx();
+    if (!bus) {
+        bus = find_q35();
+    }
+
     if (bus) {
         /* Scan all PCI buses. Set property to enable acpi based hotplug. */
         pci_for_each_bus_depth_first(bus, acpi_set_bsel, NULL, &bsel_alloc);
diff --git a/hw/pci-host/q35.c b/hw/pci-host/q35.c
index a36a1195e4..8c1603fce9 100644
--- a/hw/pci-host/q35.c
+++ b/hw/pci-host/q35.c
@@ -258,6 +258,14 @@ static void q35_host_initfn(Object *obj)
             IO_APIC_DEFAULT_ADDRESS - 1);
 }
 
+PCIBus *find_q35(void)
+{
+    PCIHostState *s = OBJECT_CHECK(PCIHostState,
+                                   object_resolve_path("/machine/q35", NULL),
+                                   TYPE_PCI_HOST_BRIDGE);
+    return s ? s->bus : NULL;
+}
+
 static const TypeInfo q35_host_info = {
     .name       = TYPE_Q35_HOST_DEVICE,
     .parent     = TYPE_PCIE_HOST_BRIDGE,
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index bb49165fe0..96d74b35bd 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -302,6 +302,9 @@ PCIBus *find_i440fx(void);
 extern PCIDevice *piix4_dev;
 int piix4_init(PCIBus *bus, ISABus **isa_bus, int devfn);
 
+/* q35.c */
+PCIBus *find_q35(void);
+
 /* pc_sysfw.c */
 void pc_system_firmware_init(MemoryRegion *rom_memory,
                              bool isapc_ram_fw);
-- 
2.11.0


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