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vhost-user: Support transferring inflight buffer between qemu and backend

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This patch introduces two new messages VHOST_USER_GET_INFLIGHT_FD
and VHOST_USER_SET_INFLIGHT_FD to support transferring a shared
buffer between qemu and backend.

Firstly, qemu uses VHOST_USER_GET_INFLIGHT_FD to get the
shared buffer from backend. Then qemu should send it back
through VHOST_USER_SET_INFLIGHT_FD each time we start vhost-user.

This shared buffer is used to track inflight I/O by backend.
Qemu should retrieve a new one when vm reset.

Signed-off-by: Xie Yongji <xieyongji@baidu.com>
Signed-off-by: Chai Wen <chaiwen@baidu.com>
Signed-off-by: Zhang Yu <zhangyu31@baidu.com>
Message-Id: <20190228085355.9614-2-xieyongji@baidu.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Xie Yongji 2019-02-28 16:53:49 +08:00 • committed by Michael S. Tsirkin
parent 1b8fff5758
commit 5ad204bf2a
5 changed files with 516 additions and 0 deletions
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10
include/hw/virtio/vhost-backend.h
View file

@ -25,6 +25,7 @@ typedef enum VhostSetConfigType {
VHOST_SET_CONFIG_TYPE_MIGRATION = 1,
} VhostSetConfigType;
struct vhost_inflight;
struct vhost_dev;
struct vhost_log;
struct vhost_memory;
@ -104,6 +105,13 @@ typedef int (*vhost_crypto_close_session_op)(struct vhost_dev *dev,
typedef bool (*vhost_backend_mem_section_filter_op)(struct vhost_dev *dev,
MemoryRegionSection *section);
typedef int (*vhost_get_inflight_fd_op)(struct vhost_dev *dev,
uint16_t queue_size,
struct vhost_inflight *inflight);
typedef int (*vhost_set_inflight_fd_op)(struct vhost_dev *dev,
struct vhost_inflight *inflight);
typedef struct VhostOps {
VhostBackendType backend_type;
vhost_backend_init vhost_backend_init;
@ -142,6 +150,8 @@ typedef struct VhostOps {
vhost_crypto_create_session_op vhost_crypto_create_session;
vhost_crypto_close_session_op vhost_crypto_close_session;
vhost_backend_mem_section_filter_op vhost_backend_mem_section_filter;
vhost_get_inflight_fd_op vhost_get_inflight_fd;
vhost_set_inflight_fd_op vhost_set_inflight_fd;
} VhostOps;
extern const VhostOps user_ops;

18
include/hw/virtio/vhost.h
View file

@ -7,6 +7,15 @@
#include "exec/memory.h"
/* Generic structures common for any vhost based device. */
struct vhost_inflight {
int fd;
void *addr;
uint64_t size;
uint64_t offset;
uint16_t queue_size;
};
struct vhost_virtqueue {
int kick;
int call;
@ -120,4 +129,13 @@ int vhost_dev_set_config(struct vhost_dev *dev, const uint8_t *data,
*/
void vhost_dev_set_config_notifier(struct vhost_dev *dev,
const VhostDevConfigOps *ops);
void vhost_dev_reset_inflight(struct vhost_inflight *inflight);
void vhost_dev_free_inflight(struct vhost_inflight *inflight);
void vhost_dev_save_inflight(struct vhost_inflight *inflight, QEMUFile *f);
int vhost_dev_load_inflight(struct vhost_inflight *inflight, QEMUFile *f);
int vhost_dev_set_inflight(struct vhost_dev *dev,
struct vhost_inflight *inflight);
int vhost_dev_get_inflight(struct vhost_dev *dev, uint16_t queue_size,
struct vhost_inflight *inflight);
#endif