[Xen-devel] [v5][PATCH 3/4] xen:hw:pci-host:piix: create host bridge to passthrough

[Tiejun Chen <tiejun.chen@xxxxxxxxx>]

Implement a pci host bridge specific to passthrough. Actually
this just inherits the standard one.

Signed-off-by: Tiejun Chen <tiejun.chen@xxxxxxxxx>
---
 hw/pci-host/piix.c   | 15 +++++++++++++++
 include/hw/i386/pc.h |  2 ++
 2 files changed, 17 insertions(+)

v5:

* Simplify to make sure its really inherited from the standard one

v4:

* Rebase

v3:

* Rebase

v2:

* Just add prefix with XEN_IGD_PASSTHROUGH/xen_igd_passthrough

diff --git a/hw/pci-host/piix.c b/hw/pci-host/piix.c
index 0cd82b8..dbf356a 100644
--- a/hw/pci-host/piix.c
+++ b/hw/pci-host/piix.c
@@ -703,6 +703,20 @@ static const TypeInfo i440fx_info = {
     .class_init    = i440fx_class_init,
 };
 
+static void xen_igd_passthrough_i440fx_class_init(ObjectClass *klass, void 
*data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->desc = "IGD PT XEN Host bridge";
+}
+
+static const TypeInfo xen_igd_passthrough_i440fx_info = {
+    .name          = TYPE_XEN_IGD_PASSTHROUGH_I440FX_PCI_DEVICE,
+    .parent        = TYPE_I440FX_PCI_DEVICE,
+    .instance_size = sizeof(PCII440FXState),
+    .class_init    = xen_igd_passthrough_i440fx_class_init,
+};
+
 static const char *i440fx_pcihost_root_bus_path(PCIHostState *host_bridge,
                                                 PCIBus *rootbus)
 {
@@ -744,6 +758,7 @@ static const TypeInfo i440fx_pcihost_info = {
 static void i440fx_register_types(void)
 {
     type_register_static(&i440fx_info);
+    type_register_static(&xen_igd_passthrough_i440fx_info);
     type_register_static(&piix3_info);
     type_register_static(&piix3_xen_info);
     type_register_static(&i440fx_pcihost_info);
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 11fb72f..de34aa6 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -238,6 +238,8 @@ typedef struct PCII440FXState PCII440FXState;
 #define TYPE_I440FX_PCI_HOST_BRIDGE "i440FX-pcihost"
 #define TYPE_I440FX_PCI_DEVICE "i440FX"
 
+#define TYPE_XEN_IGD_PASSTHROUGH_I440FX_PCI_DEVICE "xen-igd-passthrough-i440FX"
+
 PCIBus *i440fx_init(const char *host_type, const char *pci_type,
                     PCII440FXState **pi440fx_state, int *piix_devfn,
                     ISABus **isa_bus, qemu_irq *pic,
-- 
1.9.1


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