4 #include "hw/virtio/vhost-backend.h"
5 #include "hw/virtio/virtio.h"
6 #include "exec/memory.h"
8 #define VHOST_F_DEVICE_IOTLB 63
9 #define VHOST_USER_F_PROTOCOL_FEATURES 30
11 /* Generic structures common for any vhost based device. */
13 struct vhost_inflight
{
21 struct vhost_virtqueue
{
28 unsigned long long desc_phys
;
30 unsigned long long avail_phys
;
32 unsigned long long used_phys
;
34 EventNotifier masked_notifier
;
35 EventNotifier error_notifier
;
36 struct vhost_dev
*dev
;
39 typedef unsigned long vhost_log_chunk_t
;
40 #define VHOST_LOG_PAGE 0x1000
41 #define VHOST_LOG_BITS (8 * sizeof(vhost_log_chunk_t))
42 #define VHOST_LOG_CHUNK (VHOST_LOG_PAGE * VHOST_LOG_BITS)
43 #define VHOST_INVALID_FEATURE_BIT (0xff)
46 unsigned long long size
;
49 vhost_log_chunk_t
*log
;
54 struct vhost_dev
*hdev
;
58 QLIST_ENTRY(vhost_iommu
) iommu_next
;
61 typedef struct VhostDevConfigOps
{
62 /* Vhost device config space changed callback
64 int (*vhost_dev_config_notifier
)(struct vhost_dev
*dev
);
70 * struct vhost_dev - common vhost_dev structure
71 * @vhost_ops: backend specific ops
72 * @config_ops: ops for config changes (see @vhost_dev_set_config_notifier)
76 MemoryListener memory_listener
;
77 MemoryListener iommu_listener
;
78 struct vhost_memory
*mem
;
80 MemoryRegionSection
*mem_sections
;
82 MemoryRegionSection
*tmp_sections
;
83 struct vhost_virtqueue
*vqs
;
85 /* the first virtqueue which would be used by this vhost dev */
87 /* one past the last vq index for the virtio device (not vhost) */
89 /* if non-zero, minimum required value for max_queues */
92 /** @acked_features: final set of negotiated features */
93 uint64_t acked_features
;
94 /** @backend_features: backend specific feature bits */
95 uint64_t backend_features
;
96 /** @protocol_features: final negotiated protocol features */
97 uint64_t protocol_features
;
100 /* @started: is the vhost device started? */
104 Error
*migration_blocker
;
105 const VhostOps
*vhost_ops
;
107 struct vhost_log
*log
;
108 QLIST_ENTRY(vhost_dev
) entry
;
109 QLIST_HEAD(, vhost_iommu
) iommu_list
;
111 const VhostDevConfigOps
*config_ops
;
114 extern const VhostOps kernel_ops
;
115 extern const VhostOps user_ops
;
116 extern const VhostOps vdpa_ops
;
119 struct vhost_dev dev
;
120 struct vhost_virtqueue vqs
[2];
126 * vhost_dev_init() - initialise the vhost interface
127 * @hdev: the common vhost_dev structure
128 * @opaque: opaque ptr passed to backend (vhost/vhost-user/vdpa)
129 * @backend_type: type of backend
130 * @busyloop_timeout: timeout for polling virtqueue
131 * @errp: error handle
133 * The initialisation of the vhost device will trigger the
134 * initialisation of the backend and potentially capability
135 * negotiation of backend interface. Configuration of the VirtIO
136 * itself won't happen until the interface is started.
138 * Return: 0 on success, non-zero on error while setting errp.
140 int vhost_dev_init(struct vhost_dev
*hdev
, void *opaque
,
141 VhostBackendType backend_type
,
142 uint32_t busyloop_timeout
, Error
**errp
);
145 * vhost_dev_cleanup() - tear down and cleanup vhost interface
146 * @hdev: the common vhost_dev structure
148 void vhost_dev_cleanup(struct vhost_dev
*hdev
);
151 * vhost_dev_enable_notifiers() - enable event notifiers
152 * @hdev: common vhost_dev structure
153 * @vdev: the VirtIODevice structure
155 * Enable notifications directly to the vhost device rather than being
156 * triggered by QEMU itself. Notifications should be enabled before
157 * the vhost device is started via @vhost_dev_start.
159 * Return: 0 on success, < 0 on error.
161 int vhost_dev_enable_notifiers(struct vhost_dev
*hdev
, VirtIODevice
*vdev
);
164 * vhost_dev_disable_notifiers - disable event notifications
165 * @hdev: common vhost_dev structure
166 * @vdev: the VirtIODevice structure
168 * Disable direct notifications to vhost device.
170 void vhost_dev_disable_notifiers(struct vhost_dev
*hdev
, VirtIODevice
*vdev
);
173 * vhost_dev_is_started() - report status of vhost device
174 * @hdev: common vhost_dev structure
176 * Return the started status of the vhost device
178 static inline bool vhost_dev_is_started(struct vhost_dev
*hdev
)
180 return hdev
->started
;
184 * vhost_dev_start() - start the vhost device
185 * @hdev: common vhost_dev structure
186 * @vdev: the VirtIODevice structure
188 * Starts the vhost device. From this point VirtIO feature negotiation
189 * can start and the device can start processing VirtIO transactions.
191 * Return: 0 on success, < 0 on error.
193 int vhost_dev_start(struct vhost_dev
*hdev
, VirtIODevice
*vdev
);
196 * vhost_dev_stop() - stop the vhost device
197 * @hdev: common vhost_dev structure
198 * @vdev: the VirtIODevice structure
200 * Stop the vhost device. After the device is stopped the notifiers
201 * can be disabled (@vhost_dev_disable_notifiers) and the device can
202 * be torn down (@vhost_dev_cleanup).
204 void vhost_dev_stop(struct vhost_dev
*hdev
, VirtIODevice
*vdev
);
207 * DOC: vhost device configuration handling
209 * The VirtIO device configuration space is used for rarely changing
210 * or initialisation time parameters. The configuration can be updated
211 * by either the guest driver or the device itself. If the device can
212 * change the configuration over time the vhost handler should
213 * register a @VhostDevConfigOps structure with
214 * @vhost_dev_set_config_notifier so the guest can be notified. Some
215 * devices register a handler anyway and will signal an error if an
216 * unexpected config change happens.
220 * vhost_dev_get_config() - fetch device configuration
221 * @hdev: common vhost_dev_structure
222 * @config: pointer to device appropriate config structure
223 * @config_len: size of device appropriate config structure
225 * Return: 0 on success, < 0 on error while setting errp
227 int vhost_dev_get_config(struct vhost_dev
*hdev
, uint8_t *config
,
228 uint32_t config_len
, Error
**errp
);
231 * vhost_dev_set_config() - set device configuration
232 * @hdev: common vhost_dev_structure
233 * @data: pointer to data to set
234 * @offset: offset into configuration space
235 * @size: length of set
236 * @flags: @VhostSetConfigType flags
238 * By use of @offset/@size a subset of the configuration space can be
239 * written to. The @flags are used to indicate if it is a normal
240 * transaction or related to migration.
242 * Return: 0 on success, non-zero on error
244 int vhost_dev_set_config(struct vhost_dev
*dev
, const uint8_t *data
,
245 uint32_t offset
, uint32_t size
, uint32_t flags
);
248 * vhost_dev_set_config_notifier() - register VhostDevConfigOps
249 * @hdev: common vhost_dev_structure
252 * If the device is expected to change configuration a notifier can be
253 * setup to handle the case.
255 void vhost_dev_set_config_notifier(struct vhost_dev
*dev
,
256 const VhostDevConfigOps
*ops
);
259 /* Test and clear masked event pending status.
260 * Should be called after unmask to avoid losing events.
262 bool vhost_virtqueue_pending(struct vhost_dev
*hdev
, int n
);
264 /* Mask/unmask events from this vq.
266 void vhost_virtqueue_mask(struct vhost_dev
*hdev
, VirtIODevice
*vdev
, int n
,
270 * vhost_get_features() - return a sanitised set of feature bits
271 * @hdev: common vhost_dev structure
272 * @feature_bits: pointer to terminated table of feature bits
273 * @features: original feature set
275 * This returns a set of features bits that is an intersection of what
276 * is supported by the vhost backend (hdev->features), the supported
277 * feature_bits and the requested feature set.
279 uint64_t vhost_get_features(struct vhost_dev
*hdev
, const int *feature_bits
,
283 * vhost_ack_features() - set vhost acked_features
284 * @hdev: common vhost_dev structure
285 * @feature_bits: pointer to terminated table of feature bits
286 * @features: requested feature set
288 * This sets the internal hdev->acked_features to the intersection of
289 * the backends advertised features and the supported feature_bits.
291 void vhost_ack_features(struct vhost_dev
*hdev
, const int *feature_bits
,
293 bool vhost_has_free_slot(void);
295 int vhost_net_set_backend(struct vhost_dev
*hdev
,
296 struct vhost_vring_file
*file
);
298 int vhost_device_iotlb_miss(struct vhost_dev
*dev
, uint64_t iova
, int write
);
300 void vhost_dev_reset_inflight(struct vhost_inflight
*inflight
);
301 void vhost_dev_free_inflight(struct vhost_inflight
*inflight
);
302 void vhost_dev_save_inflight(struct vhost_inflight
*inflight
, QEMUFile
*f
);
303 int vhost_dev_load_inflight(struct vhost_inflight
*inflight
, QEMUFile
*f
);
304 int vhost_dev_prepare_inflight(struct vhost_dev
*hdev
, VirtIODevice
*vdev
);
305 int vhost_dev_set_inflight(struct vhost_dev
*dev
,
306 struct vhost_inflight
*inflight
);
307 int vhost_dev_get_inflight(struct vhost_dev
*dev
, uint16_t queue_size
,
308 struct vhost_inflight
*inflight
);