[PATCH RFC v2 02/16] vfio-user: add VFIO base abstract class

[Elena Ufimtseva <elena.ufimtseva@oracle.com>]

From: John Johnson <john.g.johnson@oracle.com>

Add an abstract base class both the kernel driver
and user socket implementations can use to share code.

Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
---
 hw/vfio/pci.h | 16 +++++++++++--
 hw/vfio/pci.c | 63 ++++++++++++++++++++++++++++++++-------------------
 2 files changed, 54 insertions(+), 25 deletions(-)

diff --git a/hw/vfio/pci.h b/hw/vfio/pci.h
index 64777516d1..bbc78aaeb3 100644
--- a/hw/vfio/pci.h
+++ b/hw/vfio/pci.h
@@ -114,8 +114,13 @@ typedef struct VFIOMSIXInfo {
     unsigned long *pending;
 } VFIOMSIXInfo;
 
-#define TYPE_VFIO_PCI "vfio-pci"
-OBJECT_DECLARE_SIMPLE_TYPE(VFIOPCIDevice, VFIO_PCI)
+/*
+ * TYPE_VFIO_PCI_BASE is an abstract type used to share code
+ * between VFIO implementations that use a kernel driver
+ * with those that use user sockets.
+ */
+#define TYPE_VFIO_PCI_BASE "vfio-pci-base"
+OBJECT_DECLARE_SIMPLE_TYPE(VFIOPCIDevice, VFIO_PCI_BASE)
 
 struct VFIOPCIDevice {
     PCIDevice pdev;
@@ -175,6 +180,13 @@ struct VFIOPCIDevice {
     Notifier irqchip_change_notifier;
 };
 
+#define TYPE_VFIO_PCI "vfio-pci"
+OBJECT_DECLARE_SIMPLE_TYPE(VFIOKernPCIDevice, VFIO_PCI)
+
+struct VFIOKernPCIDevice {
+    VFIOPCIDevice device;
+};
+
 /* Use uin32_t for vendor & device so PCI_ANY_ID expands and cannot match hw */
 static inline bool vfio_pci_is(VFIOPCIDevice *vdev, uint32_t vendor, uint32_t device)
 {
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index e1ea1d8a23..bea95efc33 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -231,7 +231,7 @@ static void vfio_intx_update(VFIOPCIDevice *vdev, PCIINTxRoute *route)
 
 static void vfio_intx_routing_notifier(PCIDevice *pdev)
 {
-    VFIOPCIDevice *vdev = VFIO_PCI(pdev);
+    VFIOPCIDevice *vdev = VFIO_PCI_BASE(pdev);
     PCIINTxRoute route;
 
     if (vdev->interrupt != VFIO_INT_INTx) {
@@ -457,7 +457,7 @@ static void vfio_update_kvm_msi_virq(VFIOMSIVector *vector, MSIMessage msg,
 static int vfio_msix_vector_do_use(PCIDevice *pdev, unsigned int nr,
                                    MSIMessage *msg, IOHandler *handler)
 {
-    VFIOPCIDevice *vdev = VFIO_PCI(pdev);
+    VFIOPCIDevice *vdev = VFIO_PCI_BASE(pdev);
     VFIOMSIVector *vector;
     int ret;
 
@@ -542,7 +542,7 @@ static int vfio_msix_vector_use(PCIDevice *pdev,
 
 static void vfio_msix_vector_release(PCIDevice *pdev, unsigned int nr)
 {
-    VFIOPCIDevice *vdev = VFIO_PCI(pdev);
+    VFIOPCIDevice *vdev = VFIO_PCI_BASE(pdev);
     VFIOMSIVector *vector = &vdev->msi_vectors[nr];
 
     trace_vfio_msix_vector_release(vdev->vbasedev.name, nr);
@@ -1063,7 +1063,7 @@ static const MemoryRegionOps vfio_vga_ops = {
  */
 static void vfio_sub_page_bar_update_mapping(PCIDevice *pdev, int bar)
 {
-    VFIOPCIDevice *vdev = VFIO_PCI(pdev);
+    VFIOPCIDevice *vdev = VFIO_PCI_BASE(pdev);
     VFIORegion *region = &vdev->bars[bar].region;
     MemoryRegion *mmap_mr, *region_mr, *base_mr;
     PCIIORegion *r;
@@ -1109,7 +1109,7 @@ static void vfio_sub_page_bar_update_mapping(PCIDevice *pdev, int bar)
  */
 uint32_t vfio_pci_read_config(PCIDevice *pdev, uint32_t addr, int len)
 {
-    VFIOPCIDevice *vdev = VFIO_PCI(pdev);
+    VFIOPCIDevice *vdev = VFIO_PCI_BASE(pdev);
     uint32_t emu_bits = 0, emu_val = 0, phys_val = 0, val;
 
     memcpy(&emu_bits, vdev->emulated_config_bits + addr, len);
@@ -1142,7 +1142,7 @@ uint32_t vfio_pci_read_config(PCIDevice *pdev, uint32_t addr, int len)
 void vfio_pci_write_config(PCIDevice *pdev,
                            uint32_t addr, uint32_t val, int len)
 {
-    VFIOPCIDevice *vdev = VFIO_PCI(pdev);
+    VFIOPCIDevice *vdev = VFIO_PCI_BASE(pdev);
     uint32_t val_le = cpu_to_le32(val);
 
     trace_vfio_pci_write_config(vdev->vbasedev.name, addr, val, len);
@@ -2782,7 +2782,7 @@ static void vfio_unregister_req_notifier(VFIOPCIDevice *vdev)
 
 static void vfio_realize(PCIDevice *pdev, Error **errp)
 {
-    VFIOPCIDevice *vdev = VFIO_PCI(pdev);
+    VFIOPCIDevice *vdev = VFIO_PCI_BASE(pdev);
     VFIODevice *vbasedev_iter;
     VFIOGroup *group;
     char *tmp, *subsys, group_path[PATH_MAX], *group_name;
@@ -3105,7 +3105,7 @@ error:
 
 static void vfio_instance_finalize(Object *obj)
 {
-    VFIOPCIDevice *vdev = VFIO_PCI(obj);
+    VFIOPCIDevice *vdev = VFIO_PCI_BASE(obj);
     VFIOGroup *group = vdev->vbasedev.group;
 
     vfio_display_finalize(vdev);
@@ -3125,7 +3125,7 @@ static void vfio_instance_finalize(Object *obj)
 
 static void vfio_exitfn(PCIDevice *pdev)
 {
-    VFIOPCIDevice *vdev = VFIO_PCI(pdev);
+    VFIOPCIDevice *vdev = VFIO_PCI_BASE(pdev);
 
     vfio_unregister_req_notifier(vdev);
     vfio_unregister_err_notifier(vdev);
@@ -3144,7 +3144,7 @@ static void vfio_exitfn(PCIDevice *pdev)
 
 static void vfio_pci_reset(DeviceState *dev)
 {
-    VFIOPCIDevice *vdev = VFIO_PCI(dev);
+    VFIOPCIDevice *vdev = VFIO_PCI_BASE(dev);
 
     trace_vfio_pci_reset(vdev->vbasedev.name);
 
@@ -3184,7 +3184,7 @@ post_reset:
 static void vfio_instance_init(Object *obj)
 {
     PCIDevice *pci_dev = PCI_DEVICE(obj);
-    VFIOPCIDevice *vdev = VFIO_PCI(obj);
+    VFIOPCIDevice *vdev = VFIO_PCI_BASE(obj);
 
     device_add_bootindex_property(obj, &vdev->bootindex,
                                   "bootindex", NULL,
@@ -3253,28 +3253,24 @@ static Property vfio_pci_dev_properties[] = {
     DEFINE_PROP_END_OF_LIST(),
 };
 
-static void vfio_pci_dev_class_init(ObjectClass *klass, void *data)
+static void vfio_pci_base_dev_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     PCIDeviceClass *pdc = PCI_DEVICE_CLASS(klass);
 
-    dc->reset = vfio_pci_reset;
-    device_class_set_props(dc, vfio_pci_dev_properties);
-    dc->desc = "VFIO-based PCI device assignment";
+    dc->desc = "VFIO PCI base device";
     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
-    pdc->realize = vfio_realize;
     pdc->exit = vfio_exitfn;
     pdc->config_read = vfio_pci_read_config;
     pdc->config_write = vfio_pci_write_config;
 }
 
-static const TypeInfo vfio_pci_dev_info = {
-    .name = TYPE_VFIO_PCI,
+static const TypeInfo vfio_pci_base_dev_info = {
+    .name = TYPE_VFIO_PCI_BASE,
     .parent = TYPE_PCI_DEVICE,
-    .instance_size = sizeof(VFIOPCIDevice),
-    .class_init = vfio_pci_dev_class_init,
-    .instance_init = vfio_instance_init,
-    .instance_finalize = vfio_instance_finalize,
+    .instance_size = 0,
+    .abstract = true,
+    .class_init = vfio_pci_base_dev_class_init,
     .interfaces = (InterfaceInfo[]) {
         { INTERFACE_PCIE_DEVICE },
         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
@@ -3282,6 +3278,26 @@ static const TypeInfo vfio_pci_dev_info = {
     },
 };
 
+static void vfio_pci_dev_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    PCIDeviceClass *pdc = PCI_DEVICE_CLASS(klass);
+
+    dc->reset = vfio_pci_reset;
+    device_class_set_props(dc, vfio_pci_dev_properties);
+    dc->desc = "VFIO-based PCI device assignment";
+    pdc->realize = vfio_realize;
+}
+
+static const TypeInfo vfio_pci_dev_info = {
+    .name = TYPE_VFIO_PCI,
+    .parent = TYPE_VFIO_PCI_BASE,
+    .instance_size = sizeof(VFIOKernPCIDevice),
+    .class_init = vfio_pci_dev_class_init,
+    .instance_init = vfio_instance_init,
+    .instance_finalize = vfio_instance_finalize,
+};
+
 static Property vfio_pci_dev_nohotplug_properties[] = {
     DEFINE_PROP_BOOL("ramfb", VFIOPCIDevice, enable_ramfb, false),
     DEFINE_PROP_END_OF_LIST(),
@@ -3298,12 +3314,13 @@ static void vfio_pci_nohotplug_dev_class_init(ObjectClass *klass, void *data)
 static const TypeInfo vfio_pci_nohotplug_dev_info = {
     .name = TYPE_VFIO_PCI_NOHOTPLUG,
     .parent = TYPE_VFIO_PCI,
-    .instance_size = sizeof(VFIOPCIDevice),
+    .instance_size = sizeof(VFIOKernPCIDevice),
     .class_init = vfio_pci_nohotplug_dev_class_init,
 };
 
 static void register_vfio_pci_dev_type(void)
 {
+    type_register_static(&vfio_pci_base_dev_info);
     type_register_static(&vfio_pci_dev_info);
     type_register_static(&vfio_pci_nohotplug_dev_info);
 }
-- 
2.25.1