[RFC PATCH 1/5] hw/acpi/pcihp: Introduce find_host()

[Julia Suvorova <jusual@redhat.com>]

Returns the current host bus with ACPI PCI hot-plug support: q35 or i440fx.

Signed-off-by: Julia Suvorova <jusual@redhat.com>
---
 hw/i386/acpi-build.h |  2 ++
 hw/acpi/pcihp.c      | 13 +++++++++++++
 hw/i386/acpi-build.c |  2 +-
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/hw/i386/acpi-build.h b/hw/i386/acpi-build.h
index 74df5fc612..0696b4e48d 100644
--- a/hw/i386/acpi-build.h
+++ b/hw/i386/acpi-build.h
@@ -7,4 +7,6 @@ extern const struct AcpiGenericAddress x86_nvdimm_acpi_dsmio;
 
 void acpi_setup(void);
 
+Object *acpi_get_i386_pci_host(void);
+
 #endif
diff --git a/hw/acpi/pcihp.c b/hw/acpi/pcihp.c
index d42906ea19..3d4ee3af72 100644
--- a/hw/acpi/pcihp.c
+++ b/hw/acpi/pcihp.c
@@ -33,10 +33,12 @@
 #include "hw/acpi/acpi.h"
 #include "exec/address-spaces.h"
 #include "hw/pci/pci_bus.h"
+#include "hw/pci/pci_host.h"
 #include "migration/vmstate.h"
 #include "qapi/error.h"
 #include "qom/qom-qobject.h"
 #include "trace.h"
+#include "hw/i386/acpi-build.h"
 
 #define ACPI_PCIHP_ADDR 0xae00
 #define ACPI_PCIHP_SIZE 0x0014
@@ -86,6 +88,17 @@ static void *acpi_set_bsel(PCIBus *bus, void *opaque)
     return bsel_alloc;
 }
 
+static PCIBus *find_host(void)
+{
+    Object *obj = acpi_get_i386_pci_host();
+
+    if (obj) {
+        return PCI_HOST_BRIDGE(obj)->bus;
+    }
+
+    return NULL;
+}
+
 static void acpi_set_pci_info(void)
 {
     static bool bsel_is_set;
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 900f786d08..11c598f955 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -270,7 +270,7 @@ static void acpi_get_misc_info(AcpiMiscInfo *info)
  * Because of the PXB hosts we cannot simply query TYPE_PCI_HOST_BRIDGE.
  * On i386 arch we only have two pci hosts, so we can look only for them.
  */
-static Object *acpi_get_i386_pci_host(void)
+Object *acpi_get_i386_pci_host(void)
 {
     PCIHostState *host;
 
-- 
2.25.4