hw/pxb-pcie: fix PCI Express hotplug support

Add the missing osc method for pxb-pcie devices as APCI spec recommends,
see 6.2.9.1 OSC Implementation Example for PCI Host Bridge Devices, ACPI 3.0a:

    It is recommended that a machine with multiple host bridge devices
    should report the same capabilities for all host bridges, and also
    negotiate control of the features described in the Control Field in
    the same way for all host bridges.

Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/dtc b/dtc
index ec02b34c05be04f249ffaaca4b666f5246877dea..65cc4d2748a2c2e6f27f1cf39e07a5dbabd80ebf 160000 (submodule)
--- a/dtc
+++ b/dtc
@@ -1 +1 @@
-Subproject commit ec02b34c05be04f249ffaaca4b666f5246877dea
+Subproject commit 65cc4d2748a2c2e6f27f1cf39e07a5dbabd80ebf

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index efbbfcb594b32617aaaec065856b343394041222..8018f0533bc649bfbf4541102dac4980dc8d3fcb 100644 (file)
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -1962,6 +1962,9 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
             aml_append(dev, aml_name_decl("_UID", aml_int(bus_num)));
             aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0A03")));
             aml_append(dev, aml_name_decl("_BBN", aml_int(bus_num)));
+            if (pci_bus_is_express(bus)) {
+                aml_append(dev, build_q35_osc_method());
+            }
 
             if (numa_node != NUMA_NODE_UNASSIGNED) {
                 aml_append(dev, aml_name_decl("_PXM", aml_int(numa_node)));