virtio-md-pci: New parent type for virtio-mem-pci and virtio-pmem-pci

Let's add a new abstract "virtio memory device" type, and use it as
parent class of virtio-mem-pci and virtio-pmem-pci.

Message-ID: <20230711153445.514112-2-david@redhat.com>
Tested-by: Mario Casquero <mcasquer@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>

MAINTAINERS

@@ -2229,6 +2229,12 @@ F: hw/virtio/virtio-crypto.c
 F: hw/virtio/virtio-crypto-pci.c
 F: include/hw/virtio/virtio-crypto.h
 
+virtio based memory device
+M: David Hildenbrand <david@redhat.com>
+S: Supported
+F: hw/virtio/virtio-md-pci.c
+F: include/hw/virtio/virtio-md-pci.h
+
 virtio-mem
 M: David Hildenbrand <david@redhat.com>
 S: Supported

hw/virtio/Kconfig

@@ -35,6 +35,10 @@ config VIRTIO_CRYPTO
     default y
     depends on VIRTIO
 
+config VIRTIO_MD
+    bool
+    select MEM_DEVICE
+
 config VIRTIO_PMEM_SUPPORTED
     bool
 
@@ -43,7 +47,7 @@ config VIRTIO_PMEM
     default y
     depends on VIRTIO
     depends on VIRTIO_PMEM_SUPPORTED
-    select MEM_DEVICE
+    select VIRTIO_MD
 
 config VIRTIO_MEM_SUPPORTED
     bool
@@ -54,7 +58,7 @@ config VIRTIO_MEM
     depends on VIRTIO
     depends on LINUX
     depends on VIRTIO_MEM_SUPPORTED
-    select MEM_DEVICE
+    select VIRTIO_MD
 
 config VHOST_VSOCK_COMMON
     bool

hw/virtio/meson.build

@@ -63,6 +63,7 @@ virtio_pci_ss.add(when: 'CONFIG_VIRTIO_PMEM', if_true: files('virtio-pmem-pci.c'
 virtio_pci_ss.add(when: 'CONFIG_VIRTIO_IOMMU', if_true: files('virtio-iommu-pci.c'))
 virtio_pci_ss.add(when: 'CONFIG_VIRTIO_MEM', if_true: files('virtio-mem-pci.c'))
 virtio_pci_ss.add(when: 'CONFIG_VHOST_VDPA_DEV', if_true: files('vdpa-dev-pci.c'))
+virtio_pci_ss.add(when: 'CONFIG_VIRTIO_MD', if_true: files('virtio-md-pci.c'))
 
 specific_virtio_ss.add_all(when: 'CONFIG_VIRTIO_PCI', if_true: virtio_pci_ss)
 

hw/virtio/virtio-md-pci.c

@@ -0,0 +1,33 @@
+/*
+ * Abstract virtio based memory device
+ *
+ * Copyright (C) 2023 Red Hat, Inc.
+ *
+ * Authors:
+ *  David Hildenbrand <david@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/virtio/virtio-md-pci.h"
+#include "hw/mem/memory-device.h"
+
+static const TypeInfo virtio_md_pci_info = {
+    .name = TYPE_VIRTIO_MD_PCI,
+    .parent = TYPE_VIRTIO_PCI,
+    .instance_size = sizeof(VirtIOMDPCI),
+    .class_size = sizeof(VirtIOMDPCIClass),
+    .abstract = true,
+    .interfaces = (InterfaceInfo[]) {
+        { TYPE_MEMORY_DEVICE },
+        { }
+    },
+};
+
+static void virtio_md_pci_register(void)
+{
+    type_register_static(&virtio_md_pci_info);
+}
+type_init(virtio_md_pci_register)

hw/virtio/virtio-mem-pci.c

@@ -142,14 +142,11 @@ static void virtio_mem_pci_instance_init(Object *obj)
 
 static const VirtioPCIDeviceTypeInfo virtio_mem_pci_info = {
     .base_name = TYPE_VIRTIO_MEM_PCI,
+    .parent = TYPE_VIRTIO_MD_PCI,
     .generic_name = "virtio-mem-pci",
     .instance_size = sizeof(VirtIOMEMPCI),
     .instance_init = virtio_mem_pci_instance_init,
     .class_init = virtio_mem_pci_class_init,
-    .interfaces = (InterfaceInfo[]) {
-        { TYPE_MEMORY_DEVICE },
-        { }
-    },
 };
 
 static void virtio_mem_pci_register_types(void)

hw/virtio/virtio-mem-pci.h

@@ -13,21 +13,21 @@
 #ifndef QEMU_VIRTIO_MEM_PCI_H
 #define QEMU_VIRTIO_MEM_PCI_H
 
-#include "hw/virtio/virtio-pci.h"
+#include "hw/virtio/virtio-md-pci.h"
 #include "hw/virtio/virtio-mem.h"
 #include "qom/object.h"
 
 typedef struct VirtIOMEMPCI VirtIOMEMPCI;
 
 /*
- * virtio-mem-pci: This extends VirtioPCIProxy.
+ * virtio-mem-pci: This extends VirtIOMDPCI.
  */
 #define TYPE_VIRTIO_MEM_PCI "virtio-mem-pci-base"
 DECLARE_INSTANCE_CHECKER(VirtIOMEMPCI, VIRTIO_MEM_PCI,
                          TYPE_VIRTIO_MEM_PCI)
 
 struct VirtIOMEMPCI {
-    VirtIOPCIProxy parent_obj;
+    VirtIOMDPCI parent_obj;
     VirtIOMEM vdev;
     Notifier size_change_notifier;
 };

hw/virtio/virtio-pmem-pci.c

@@ -110,13 +110,10 @@ static void virtio_pmem_pci_instance_init(Object *obj)
 static const VirtioPCIDeviceTypeInfo virtio_pmem_pci_info = {
     .base_name             = TYPE_VIRTIO_PMEM_PCI,
     .generic_name          = "virtio-pmem-pci",
+    .parent                = TYPE_VIRTIO_MD_PCI,
     .instance_size = sizeof(VirtIOPMEMPCI),
     .instance_init = virtio_pmem_pci_instance_init,
     .class_init    = virtio_pmem_pci_class_init,
-    .interfaces = (InterfaceInfo[]) {
-        { TYPE_MEMORY_DEVICE },
-        { }
-    },
 };
 
 static void virtio_pmem_pci_register_types(void)

hw/virtio/virtio-pmem-pci.h

@@ -14,21 +14,21 @@
 #ifndef QEMU_VIRTIO_PMEM_PCI_H
 #define QEMU_VIRTIO_PMEM_PCI_H
 
-#include "hw/virtio/virtio-pci.h"
+#include "hw/virtio/virtio-md-pci.h"
 #include "hw/virtio/virtio-pmem.h"
 #include "qom/object.h"
 
 typedef struct VirtIOPMEMPCI VirtIOPMEMPCI;
 
 /*
- * virtio-pmem-pci: This extends VirtioPCIProxy.
+ * virtio-pmem-pci: This extends VirtIOMDPCI.
  */
 #define TYPE_VIRTIO_PMEM_PCI "virtio-pmem-pci-base"
 DECLARE_INSTANCE_CHECKER(VirtIOPMEMPCI, VIRTIO_PMEM_PCI,
                          TYPE_VIRTIO_PMEM_PCI)
 
 struct VirtIOPMEMPCI {
-    VirtIOPCIProxy parent_obj;
+    VirtIOMDPCI parent_obj;
     VirtIOPMEM vdev;
 };
 

include/hw/virtio/virtio-md-pci.h

@@ -0,0 +1,35 @@
+/*
+ * Abstract virtio based memory device
+ *
+ * Copyright (C) 2023 Red Hat, Inc.
+ *
+ * Authors:
+ *  David Hildenbrand <david@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef HW_VIRTIO_MD_PCI_H
+#define HW_VIRTIO_MD_PCI_H
+
+#include "hw/virtio/virtio-pci.h"
+#include "qom/object.h"
+
+/*
+ * virtio-md-pci: This extends VirtioPCIProxy.
+ */
+#define TYPE_VIRTIO_MD_PCI "virtio-md-pci"
+
+OBJECT_DECLARE_TYPE(VirtIOMDPCI, VirtIOMDPCIClass, VIRTIO_MD_PCI)
+
+struct VirtIOMDPCIClass {
+    /* private */
+    VirtioPCIClass parent;
+};
+
+struct VirtIOMDPCI {
+    VirtIOPCIProxy parent_obj;
+};
+
+#endif