[Xen-devel] [PATCH] Add Xen platform PCI device version 2.

[Paul Durrant <paul.durrant@xxxxxxxxxx>]

The XenServer 6.1+ Citrix Windows PV bus driver binds to a new version
of the Xen platform device (since the newer driver set cannot co-exist
with previous drivers which bind to the existing "xen-platform" type of
device). This patch introduces a new "xen-platform-2" device type with
the appropriate device_id and revision.

Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
---
 hw/xen/xen_platform.c    |   75 ++++++++++++++++++++++++++++++++++++++--------
 include/hw/pci/pci_ids.h |    1 +
 2 files changed, 63 insertions(+), 13 deletions(-)

diff --git a/hw/xen/xen_platform.c b/hw/xen/xen_platform.c
index b6c6793..6edb850 100644
--- a/hw/xen/xen_platform.c
+++ b/hw/xen/xen_platform.c
@@ -48,6 +48,20 @@
 
 #define PFFLAG_ROM_LOCK 1 /* Sets whether ROM memory area is RW or RO */
 
+typedef struct {
+    const char *name;
+    const char *desc;
+    uint16_t device_id;
+    uint8_t revision;
+    uint16_t subsystem_vendor_id;
+    uint16_t subsystem_id;
+} PCIXenPlatformDeviceInfo;
+
+typedef struct PCIXenPlatformDeviceClass {
+    PCIDeviceClass              parent_class;
+    PCIXenPlatformDeviceInfo    info;
+} PCIXenPlatformDeviceClass;
+
 typedef struct PCIXenPlatformState {
     PCIDevice  pci_dev;
     MemoryRegion fixed_io;
@@ -372,8 +386,13 @@ static const VMStateDescription vmstate_xen_platform = {
 static int xen_platform_initfn(PCIDevice *dev)
 {
     PCIXenPlatformState *d = DO_UPCAST(PCIXenPlatformState, pci_dev, dev);
+    PCIDeviceClass *k = PCI_DEVICE_GET_CLASS(dev);
+    __attribute__((unused)) PCIXenPlatformDeviceClass *u;
     uint8_t *pci_conf;
 
+    u = container_of(k, PCIXenPlatformDeviceClass, parent_class);
+    DPRINTF("initializing %s\n", u->info.name);
+
     pci_conf = d->pci_dev.config;
 
     pci_set_word(pci_conf + PCI_COMMAND, PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
@@ -402,33 +421,63 @@ static void platform_reset(DeviceState *dev)
     platform_fixed_ioport_reset(s);
 }
 
+static PCIXenPlatformDeviceInfo platform_devices[] = {
+    {
+        .name = "xen-platform",
+        .desc = "XEN platform pci device (version 1)",
+        .device_id = PCI_DEVICE_ID_XEN_PLATFORM,
+        .revision = 1,
+        .subsystem_vendor_id = PCI_VENDOR_ID_XEN,
+        .subsystem_id = PCI_DEVICE_ID_XEN_PLATFORM,
+    }, {
+        .name = "xen-platform-2",
+        .desc = "XEN platform pci device (version 2)",
+        .device_id = PCI_DEVICE_ID_XEN_PLATFORM_V2,
+        .revision = 2,
+        .subsystem_vendor_id = PCI_VENDOR_ID_XEN,
+        .subsystem_id = PCI_DEVICE_ID_XEN_PLATFORM_V2,
+    }
+};
+
 static void xen_platform_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+    PCIXenPlatformDeviceInfo *info = data;
+    PCIXenPlatformDeviceClass *u;
+
+    u = container_of(k, PCIXenPlatformDeviceClass, parent_class);
 
     k->init = xen_platform_initfn;
     k->vendor_id = PCI_VENDOR_ID_XEN;
-    k->device_id = PCI_DEVICE_ID_XEN_PLATFORM;
+    k->device_id = info->device_id;
     k->class_id = PCI_CLASS_OTHERS << 8 | 0x80;
-    k->subsystem_vendor_id = PCI_VENDOR_ID_XEN;
-    k->subsystem_id = PCI_DEVICE_ID_XEN_PLATFORM;
-    k->revision = 1;
-    dc->desc = "XEN platform pci device";
+    k->subsystem_vendor_id = info->subsystem_vendor_id;
+    k->subsystem_id = info->subsystem_id;
+    k->revision = info->revision;
+    dc->desc = info->desc;
     dc->reset = platform_reset;
     dc->vmsd = &vmstate_xen_platform;
+    u->info = *info;
 }
 
-static const TypeInfo xen_platform_info = {
-    .name          = "xen-platform",
-    .parent        = TYPE_PCI_DEVICE,
-    .instance_size = sizeof(PCIXenPlatformState),
-    .class_init    = xen_platform_class_init,
-};
-
 static void xen_platform_register_types(void)
 {
-    type_register_static(&xen_platform_info);
+    TypeInfo type_info = {
+        .parent        = TYPE_PCI_DEVICE,
+        .instance_size = sizeof(PCIXenPlatformState),
+        .class_size    = sizeof(PCIXenPlatformDeviceClass),
+        .class_init    = xen_platform_class_init,
+    };
+    int i;
+    for (i = 0; i < ARRAY_SIZE(platform_devices); i++) {
+        PCIXenPlatformDeviceInfo *info = &platform_devices[i];
+
+        type_info.name = info->name;
+        type_info.class_data = info;
+        
+        type_register(&type_info);
+    }
 }
 
 type_init(xen_platform_register_types)
diff --git a/include/hw/pci/pci_ids.h b/include/hw/pci/pci_ids.h
index d8dc2f1..2039fba 100644
--- a/include/hw/pci/pci_ids.h
+++ b/include/hw/pci/pci_ids.h
@@ -144,6 +144,7 @@
 
 #define PCI_VENDOR_ID_XEN               0x5853
 #define PCI_DEVICE_ID_XEN_PLATFORM      0x0001
+#define PCI_DEVICE_ID_XEN_PLATFORM_V2   0x0002
 
 #define PCI_VENDOR_ID_NEC                0x1033
 #define PCI_DEVICE_ID_NEC_UPD720200      0x0194
-- 
1.7.10.4


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