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libvhost-user: handle shared_object msg

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In the libvhost-user library we need to
handle VHOST_USER_GET_SHARED_OBJECT requests,
and add helper functions to allow sending messages
to interact with the virtio shared objects
hash table.

Signed-off-by: Albert Esteve <aesteve@redhat.com>
Message-Id: <20231002065706.94707-5-aesteve@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Albert Esteve 2023-10-02 08:57:06 +02:00 • committed by Michael S. Tsirkin
parent 1609476662
commit ce0f3b032a
2 changed files with 174 additions and 1 deletions
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55
subprojects/libvhost-user/libvhost-user.h
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@ -64,7 +64,8 @@ enum VhostUserProtocolFeature {
VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD = 12,
VHOST_USER_PROTOCOL_F_INBAND_NOTIFICATIONS = 14,
VHOST_USER_PROTOCOL_F_CONFIGURE_MEM_SLOTS = 15,
/* Feature 16 is reserved for VHOST_USER_PROTOCOL_F_STATUS. */
VHOST_USER_PROTOCOL_F_SHARED_OBJECT = 17,
VHOST_USER_PROTOCOL_F_MAX
};
@ -109,6 +110,7 @@ typedef enum VhostUserRequest {
VHOST_USER_GET_MAX_MEM_SLOTS = 36,
VHOST_USER_ADD_MEM_REG = 37,
VHOST_USER_REM_MEM_REG = 38,
VHOST_USER_GET_SHARED_OBJECT = 41,
VHOST_USER_MAX
} VhostUserRequest;
@ -119,6 +121,9 @@ typedef enum VhostUserBackendRequest {
VHOST_USER_BACKEND_VRING_HOST_NOTIFIER_MSG = 3,
VHOST_USER_BACKEND_VRING_CALL = 4,
VHOST_USER_BACKEND_VRING_ERR = 5,
VHOST_USER_BACKEND_SHARED_OBJECT_ADD = 6,
VHOST_USER_BACKEND_SHARED_OBJECT_REMOVE = 7,
VHOST_USER_BACKEND_SHARED_OBJECT_LOOKUP = 8,
VHOST_USER_BACKEND_MAX
} VhostUserBackendRequest;
@ -172,6 +177,12 @@ typedef struct VhostUserInflight {
uint16_t queue_size;
} VhostUserInflight;
#define UUID_LEN 16
typedef struct VhostUserShared {
unsigned char uuid[UUID_LEN];
} VhostUserShared;
#if defined(_WIN32) && (defined(__x86_64__) || defined(__i386__))
# define VU_PACKED __attribute__((gcc_struct, packed))
#else
@ -199,6 +210,7 @@ typedef struct VhostUserMsg {
VhostUserConfig config;
VhostUserVringArea area;
VhostUserInflight inflight;
VhostUserShared object;
} payload;
int fds[VHOST_MEMORY_BASELINE_NREGIONS];
@ -232,6 +244,7 @@ typedef int (*vu_get_config_cb) (VuDev *dev, uint8_t *config, uint32_t len);
typedef int (*vu_set_config_cb) (VuDev *dev, const uint8_t *data,
uint32_t offset, uint32_t size,
uint32_t flags);
typedef int (*vu_get_shared_object_cb) (VuDev *dev, const unsigned char *uuid);
typedef struct VuDevIface {
/* called by VHOST_USER_GET_FEATURES to get the features bitmask */
@ -258,6 +271,8 @@ typedef struct VuDevIface {
vu_get_config_cb get_config;
/* set the config space of the device */
vu_set_config_cb set_config;
/* get virtio shared object from the underlying vhost implementation. */
vu_get_shared_object_cb get_shared_object;
} VuDevIface;
typedef void (*vu_queue_handler_cb) (VuDev *dev, int qidx);
@ -541,6 +556,44 @@ void vu_set_queue_handler(VuDev *dev, VuVirtq *vq,
bool vu_set_queue_host_notifier(VuDev *dev, VuVirtq *vq, int fd,
int size, int offset);
/**
* vu_lookup_shared_object:
* @dev: a VuDev context
* @uuid: UUID of the shared object
* @dmabuf_fd: output dma-buf file descriptor
*
* Lookup for a virtio shared object (i.e., dma-buf fd) associated with the
* received UUID. Result, if found, is stored in the dmabuf_fd argument.
*
* Returns: whether the virtio object was found.
*/
bool vu_lookup_shared_object(VuDev *dev, unsigned char uuid[UUID_LEN],
int *dmabuf_fd);
/**
* vu_add_shared_object:
* @dev: a VuDev context
* @uuid: UUID of the shared object
*
* Registers this back-end as the exporter for the object associated with
* the received UUID.
*
* Returns: TRUE on success, FALSE on failure.
*/
bool vu_add_shared_object(VuDev *dev, unsigned char uuid[UUID_LEN]);
/**
* vu_rm_shared_object:
* @dev: a VuDev context
* @uuid: UUID of the shared object
*
* Removes a shared object entry (i.e., back-end entry) associated with the
* received UUID key from the hash table.
*
* Returns: TRUE on success, FALSE on failure.
*/
bool vu_rm_shared_object(VuDev *dev, unsigned char uuid[UUID_LEN]);
/**
* vu_queue_set_notification:
* @dev: a VuDev context