[Qemu-devel] [PATCH RFC 02/17] hw/acpi: add support for multiple root busses

[Marcel Apfelbaum <marcel@redhat.com>]

If the machine has several root busses, we need to add them to
acpi in order to be properly detected by guests.

Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
---
 hw/i386/acpi-build.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 5831450..9837120 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -60,6 +60,8 @@
 #include "qom/qom-qobject.h"
 #include "exec/ram_addr.h"
 
+#include "qmp-commands.h"
+
 /* These are used to size the ACPI tables for -M pc-i440fx-1.7 and
  * -M pc-i440fx-2.0.  Even if the actual amount of AML generated grows
  * a little bit, there should be plenty of free space since the DSDT
@@ -661,6 +663,34 @@ build_ssdt(AcpiAml *table_aml, GArray *linker,
     ssdt =
         acpi_def_block("SSDT", 1, ACPI_BUILD_APPNAME6, ACPI_BUILD_APPNAME4, 1);
 
+    {
+        PciInfoList *info_list, *info;
+        Error *err = NULL;
+
+        info_list = qmp_query_pci(&err);
+        if (err) {
+            error_free(err);
+            return;
+        }
+
+        for (info = info_list; info; info = info->next) {
+            PciInfo *bus_info = info->value;
+
+            if (bus_info->bus == 0) {
+                continue;
+            }
+
+            scope = acpi_scope("\\_SB");
+            dev = acpi_device("PC%.02X", (uint8_t)bus_info->bus);
+            aml_append(&dev, acpi_name_decl("_HID", acpi_string("PNP0A03")));
+            aml_append(&dev,
+                acpi_name_decl("_BBN", acpi_int((uint8_t)bus_info->bus)));
+            aml_append(&scope, dev);
+            aml_append(&ssdt, scope);
+        }
+        qapi_free_PciInfoList(info_list);
+    }
+
     scope = acpi_scope("\\_SB.PCI0");
     /* build PCI0._CRS */
     crs = acpi_resource_template();
-- 
2.1.0