[Qemu-devel] [v4][PATCH 4/5] xen:hw:pci-host:piix: create host bridge to passthrough

[Tiejun Chen <tiejun.chen@intel.com>]

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@intel.com>
---
 hw/pci-host/piix.c   | 39 +++++++++++++++++++++++++++++++++++++++
 include/hw/i386/pc.h |  2 ++
 2 files changed, 41 insertions(+)

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 4330599..5cac398 100644
--- a/hw/pci-host/piix.c
+++ b/hw/pci-host/piix.c
@@ -303,6 +303,17 @@ static int i440fx_initfn(PCIDevice *dev)
     return 0;
 }
 
+static int xen_igd_passthrough_i440fx_initfn(PCIDevice *dev)
+{
+    PCII440FXState *d = I440FX_PCI_DEVICE(dev,
+                         TYPE_XEN_IGD_PASSTHROUGH_I440FX_PCI_DEVICE);
+
+    dev->config[I440FX_SMRAM] = 0x02;
+
+    cpu_smm_register(&i440fx_set_smm, d);
+    return 0;
+}
+
 PCIBus *i440fx_init(const char *host_type, const char *pci_type,
                     PCII440FXState **pi440fx_state,
                     int *piix3_devfn,
@@ -703,6 +714,33 @@ 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)
 {
@@ -744,6 +782,7 @@ 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