Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 257 insertions, 0 deletions

diff --git a/include/hw/qdev-properties.h b/include/hw/qdev-properties.h
new file mode 100644
index 000000000..f7925f67d
--- /dev/null
+++ b/include/hw/qdev-properties.h
@@ -0,0 +1,257 @@
+#ifndef QEMU_QDEV_PROPERTIES_H
+#define QEMU_QDEV_PROPERTIES_H
+
+#include "hw/qdev-core.h"
+
+/**
+ * Property:
+ * @set_default: true if the default value should be set from @defval,
+ *    in which case @info->set_default_value must not be NULL
+ *    (if false then no default value is set by the property system
+ *     and the field retains whatever value it was given by instance_init).
+ * @defval: default value for the property. This is used only if @set_default
+ *     is true.
+ */
+struct Property {
+    const char   *name;
+    const PropertyInfo *info;
+    ptrdiff_t    offset;
+    uint8_t      bitnr;
+    bool         set_default;
+    union {
+        int64_t i;
+        uint64_t u;
+    } defval;
+    int          arrayoffset;
+    const PropertyInfo *arrayinfo;
+    int          arrayfieldsize;
+    const char   *link_type;
+};
+
+struct PropertyInfo {
+    const char *name;
+    const char *description;
+    const QEnumLookup *enum_table;
+    bool realized_set_allowed; /* allow setting property on realized device */
+    int (*print)(Object *obj, Property *prop, char *dest, size_t len);
+    void (*set_default_value)(ObjectProperty *op, const Property *prop);
+    ObjectProperty *(*create)(ObjectClass *oc, const char *name,
+                              Property *prop);
+    ObjectPropertyAccessor *get;
+    ObjectPropertyAccessor *set;
+    ObjectPropertyRelease *release;
+};
+
+
+/*** qdev-properties.c ***/
+
+extern const PropertyInfo qdev_prop_bit;
+extern const PropertyInfo qdev_prop_bit64;
+extern const PropertyInfo qdev_prop_bool;
+extern const PropertyInfo qdev_prop_enum;
+extern const PropertyInfo qdev_prop_uint8;
+extern const PropertyInfo qdev_prop_uint16;
+extern const PropertyInfo qdev_prop_uint32;
+extern const PropertyInfo qdev_prop_int32;
+extern const PropertyInfo qdev_prop_uint64;
+extern const PropertyInfo qdev_prop_int64;
+extern const PropertyInfo qdev_prop_size;
+extern const PropertyInfo qdev_prop_string;
+extern const PropertyInfo qdev_prop_on_off_auto;
+extern const PropertyInfo qdev_prop_size32;
+extern const PropertyInfo qdev_prop_arraylen;
+extern const PropertyInfo qdev_prop_link;
+
+#define DEFINE_PROP(_name, _state, _field, _prop, _type, ...) {  \
+        .name      = (_name),                                    \
+        .info      = &(_prop),                                   \
+        .offset    = offsetof(_state, _field)                    \
+            + type_check(_type, typeof_field(_state, _field)),   \
+        __VA_ARGS__                                              \
+        }
+
+#define DEFINE_PROP_SIGNED(_name, _state, _field, _defval, _prop, _type) \
+    DEFINE_PROP(_name, _state, _field, _prop, _type,                     \
+                .set_default = true,                                     \
+                .defval.i    = (_type)_defval)
+
+#define DEFINE_PROP_SIGNED_NODEFAULT(_name, _state, _field, _prop, _type) \
+    DEFINE_PROP(_name, _state, _field, _prop, _type)
+
+#define DEFINE_PROP_BIT(_name, _state, _field, _bit, _defval)   \
+    DEFINE_PROP(_name, _state, _field, qdev_prop_bit, uint32_t, \
+                .bitnr       = (_bit),                          \
+                .set_default = true,                            \
+                .defval.u    = (bool)_defval)
+
+#define DEFINE_PROP_UNSIGNED(_name, _state, _field, _defval, _prop, _type) \
+    DEFINE_PROP(_name, _state, _field, _prop, _type,                       \
+                .set_default = true,                                       \
+                .defval.u  = (_type)_defval)
+
+#define DEFINE_PROP_UNSIGNED_NODEFAULT(_name, _state, _field, _prop, _type) \
+    DEFINE_PROP(_name, _state, _field, _prop, _type)
+
+#define DEFINE_PROP_BIT64(_name, _state, _field, _bit, _defval)   \
+    DEFINE_PROP(_name, _state, _field, qdev_prop_bit64, uint64_t, \
+                .bitnr    = (_bit),                               \
+                .set_default = true,                              \
+                .defval.u  = (bool)_defval)
+
+#define DEFINE_PROP_BOOL(_name, _state, _field, _defval)     \
+    DEFINE_PROP(_name, _state, _field, qdev_prop_bool, bool, \
+                .set_default = true,                         \
+                .defval.u    = (bool)_defval)
+
+#define PROP_ARRAY_LEN_PREFIX "len-"
+
+/**
+ * DEFINE_PROP_ARRAY:
+ * @_name: name of the array
+ * @_state: name of the device state structure type
+ * @_field: uint32_t field in @_state to hold the array length
+ * @_arrayfield: field in @_state (of type '@_arraytype *') which
+ *               will point to the array
+ * @_arrayprop: PropertyInfo defining what property the array elements have
+ * @_arraytype: C type of the array elements
+ *
+ * Define device properties for a variable-length array _name.  A
+ * static property "len-arrayname" is defined. When the device creator
+ * sets this property to the desired length of array, further dynamic
+ * properties "arrayname[0]", "arrayname[1]", ...  are defined so the
+ * device creator can set the array element values. Setting the
+ * "len-arrayname" property more than once is an error.
+ *
+ * When the array length is set, the @_field member of the device
+ * struct is set to the array length, and @_arrayfield is set to point
+ * to (zero-initialised) memory allocated for the array.  For a zero
+ * length array, @_field will be set to 0 and @_arrayfield to NULL.
+ * It is the responsibility of the device deinit code to free the
+ * @_arrayfield memory.
+ */
+#define DEFINE_PROP_ARRAY(_name, _state, _field,               \
+                          _arrayfield, _arrayprop, _arraytype) \
+    DEFINE_PROP((PROP_ARRAY_LEN_PREFIX _name),                 \
+                _state, _field, qdev_prop_arraylen, uint32_t,  \
+                .set_default = true,                           \
+                .defval.u = 0,                                 \
+                .arrayinfo = &(_arrayprop),                    \
+                .arrayfieldsize = sizeof(_arraytype),          \
+                .arrayoffset = offsetof(_state, _arrayfield))
+
+#define DEFINE_PROP_LINK(_name, _state, _field, _type, _ptr_type)     \
+    DEFINE_PROP(_name, _state, _field, qdev_prop_link, _ptr_type,     \
+                .link_type  = _type)
+
+#define DEFINE_PROP_UINT8(_n, _s, _f, _d)                       \
+    DEFINE_PROP_UNSIGNED(_n, _s, _f, _d, qdev_prop_uint8, uint8_t)
+#define DEFINE_PROP_UINT16(_n, _s, _f, _d)                      \
+    DEFINE_PROP_UNSIGNED(_n, _s, _f, _d, qdev_prop_uint16, uint16_t)
+#define DEFINE_PROP_UINT32(_n, _s, _f, _d)                      \
+    DEFINE_PROP_UNSIGNED(_n, _s, _f, _d, qdev_prop_uint32, uint32_t)
+#define DEFINE_PROP_INT32(_n, _s, _f, _d)                      \
+    DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_int32, int32_t)
+#define DEFINE_PROP_UINT64(_n, _s, _f, _d)                      \
+    DEFINE_PROP_UNSIGNED(_n, _s, _f, _d, qdev_prop_uint64, uint64_t)
+#define DEFINE_PROP_INT64(_n, _s, _f, _d)                      \
+    DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_int64, int64_t)
+#define DEFINE_PROP_SIZE(_n, _s, _f, _d)                       \
+    DEFINE_PROP_UNSIGNED(_n, _s, _f, _d, qdev_prop_size, uint64_t)
+#define DEFINE_PROP_STRING(_n, _s, _f)             \
+    DEFINE_PROP(_n, _s, _f, qdev_prop_string, char*)
+#define DEFINE_PROP_ON_OFF_AUTO(_n, _s, _f, _d) \
+    DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_on_off_auto, OnOffAuto)
+#define DEFINE_PROP_SIZE32(_n, _s, _f, _d)                       \
+    DEFINE_PROP_UNSIGNED(_n, _s, _f, _d, qdev_prop_size32, uint32_t)
+
+#define DEFINE_PROP_END_OF_LIST()               \
+    {}
+
+/*
+ * Set properties between creation and realization.
+ *
+ * Returns: %true on success, %false on error.
+ */
+bool qdev_prop_set_drive_err(DeviceState *dev, const char *name,
+                             BlockBackend *value, Error **errp);
+
+/*
+ * Set properties between creation and realization.
+ * @value must be valid.  Each property may be set at most once.
+ */
+void qdev_prop_set_bit(DeviceState *dev, const char *name, bool value);
+void qdev_prop_set_uint8(DeviceState *dev, const char *name, uint8_t value);
+void qdev_prop_set_uint16(DeviceState *dev, const char *name, uint16_t value);
+void qdev_prop_set_uint32(DeviceState *dev, const char *name, uint32_t value);
+void qdev_prop_set_int32(DeviceState *dev, const char *name, int32_t value);
+void qdev_prop_set_uint64(DeviceState *dev, const char *name, uint64_t value);
+void qdev_prop_set_string(DeviceState *dev, const char *name, const char *value);
+void qdev_prop_set_chr(DeviceState *dev, const char *name, Chardev *value);
+void qdev_prop_set_netdev(DeviceState *dev, const char *name, NetClientState *value);
+void qdev_prop_set_drive(DeviceState *dev, const char *name,
+                         BlockBackend *value);
+void qdev_prop_set_macaddr(DeviceState *dev, const char *name,
+                           const uint8_t *value);
+void qdev_prop_set_enum(DeviceState *dev, const char *name, int value);
+
+void *object_field_prop_ptr(Object *obj, Property *prop);
+
+void qdev_prop_register_global(GlobalProperty *prop);
+const GlobalProperty *qdev_find_global_prop(Object *obj,
+                                            const char *name);
+int qdev_prop_check_globals(void);
+void qdev_prop_set_globals(DeviceState *dev);
+void error_set_from_qdev_prop_error(Error **errp, int ret, Object *obj,
+                                    const char *name, const char *value);
+
+/**
+ * qdev_property_add_static:
+ * @dev: Device to add the property to.
+ * @prop: The qdev property definition.
+ *
+ * Add a static QOM property to @dev for qdev property @prop.
+ * On error, store error in @errp.  Static properties access data in a struct.
+ * The type of the QOM property is derived from prop->info.
+ */
+void qdev_property_add_static(DeviceState *dev, Property *prop);
+
+/**
+ * qdev_alias_all_properties: Create aliases on source for all target properties
+ * @target: Device which has properties to be aliased
+ * @source: Object to add alias properties to
+ *
+ * Add alias properties to the @source object for all qdev properties on
+ * the @target DeviceState.
+ *
+ * This is useful when @target is an internal implementation object
+ * owned by @source, and you want to expose all the properties of that
+ * implementation object as properties on the @source object so that users
+ * of @source can set them.
+ */
+void qdev_alias_all_properties(DeviceState *target, Object *source);
+
+/**
+ * @qdev_prop_set_after_realize:
+ * @dev: device
+ * @name: name of property
+ * @errp: indirect pointer to Error to be set
+ * Set the Error object to report that an attempt was made to set a property
+ * on a device after it has already been realized. This is a utility function
+ * which allows property-setter functions to easily report the error in
+ * a friendly format identifying both the device and the property.
+ */
+void qdev_prop_set_after_realize(DeviceState *dev, const char *name,
+                                 Error **errp);
+
+/**
+ * qdev_prop_allow_set_link_before_realize:
+ *
+ * Set the #Error object if an attempt is made to set the link after realize.
+ * This function should be used as the check() argument to
+ * object_property_add_link().
+ */
+void qdev_prop_allow_set_link_before_realize(const Object *obj,
+                                             const char *name,
+                                             Object *val, Error **errp);
+
+#endif