[Xen-devel] [v2][PATCH 3/5] 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.

This is based on http://patchwork.ozlabs.org/patch/363810/.

Signed-off-by: Tiejun Chen <tiejun.chen@xxxxxxxxx>
---
 hw/pci-host/piix.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

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 a9a5570..8414864 100644
--- a/hw/pci-host/piix.c
+++ b/hw/pci-host/piix.c
@@ -95,6 +95,10 @@ typedef struct PIIX3State {
 #define I440FX_PCI_DEVICE(obj) \
     OBJECT_CHECK(PCII440FXState, (obj), TYPE_I440FX_PCI_DEVICE)
 
+#define TYPE_XEN_IGD_PASSTHROUGH_I440FX_PCI_DEVICE "xen-igd-passthrough-i440FX"
+#define XEN_IGD_PASSTHROUGH_I440FX_PCI_DEVICE(obj) \
+    OBJECT_CHECK(PCII440FXState, (obj), 
TYPE_XEN_IGD_PASSTHROUGH_I440FX_PCI_DEVICE)
+
 struct PCII440FXState {
     /*< private >*/
     PCIDevice parent_obj;
@@ -305,6 +309,16 @@ static int i440fx_initfn(PCIDevice *dev)
     return 0;
 }
 
+static int xen_igd_passthrough_i440fx_initfn(PCIDevice *dev)
+{
+    PCII440FXState *d = XEN_IGD_PASSTHROUGH_I440FX_PCI_DEVICE(dev);
+
+    dev->config[I440FX_SMRAM] = 0x02;
+
+    cpu_smm_register(&i440fx_set_smm, d);
+    return 0;
+}
+
 static void i440fx_pci_host_create(DeviceState **dev_bridge,
                                    PCIBus **bus_bridge,
                                    MemoryRegion *address_space_io,
@@ -763,6 +777,33 @@ 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);
+    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+
+    k->init = xen_igd_passthrough_i440fx_initfn;
+    k->vendor_id = PCI_VENDOR_ID_INTEL;
+    k->device_id = PCI_DEVICE_ID_INTEL_82441;
+    k->revision = 0x02;
+    k->class_id = PCI_CLASS_BRIDGE_HOST;
+    dc->desc = "IGD PT XEN Host bridge";
+    dc->vmsd = &vmstate_i440fx;
+    /*
+     * PCI-facing part of the host bridge, not usable without the
+     * host-facing part, which can't be device_add'ed, yet.
+     */
+    dc->cannot_instantiate_with_device_add_yet = true;
+    dc->hotpluggable   = false;
+}
+
+static const TypeInfo xen_igd_passthrough_i440fx_info = {
+    .name          = TYPE_XEN_IGD_PASSTHROUGH_I440FX_PCI_DEVICE,
+    .parent        = TYPE_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)
 {
@@ -804,6 +845,7 @@ 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);
-- 
1.9.1


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