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vhost-user: add vhost_user_requires_shm_log() 

Check if the backend has VHOST_USER_PROTOCOL_F_LOG_SHMFD feature and
require a shared log.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Thibaut Collet <thibaut.collet@6wind.com>
This commit is contained in:
Marc-André Lureau 2015-10-09 17:17:24 +02:00 committed by Michael S. Tsirkin
parent c2bea314f6
commit 1be0ac2109
2 changed files with 16 additions and 2 deletions
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14
hw/virtio/vhost-user.c
View File

@ -25,9 +25,10 @@
#define VHOST_MEMORY_MAX_NREGIONS 8
#define VHOST_USER_F_PROTOCOL_FEATURES 30
#define VHOST_USER_PROTOCOL_FEATURE_MASK 0x1ULL
#define VHOST_USER_PROTOCOL_F_MQ 0
#define VHOST_USER_PROTOCOL_FEATURE_MASK 0x3ULL
#define VHOST_USER_PROTOCOL_F_MQ 0
#define VHOST_USER_PROTOCOL_F_LOG_SHMFD 1
typedef enum VhostUserRequest {
VHOST_USER_NONE = 0,
@ -458,6 +459,14 @@ static int vhost_user_memslots_limit(struct vhost_dev *dev)
return VHOST_MEMORY_MAX_NREGIONS;
}
static bool vhost_user_requires_shm_log(struct vhost_dev *dev)
{
assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER);
return virtio_has_feature(dev->protocol_features,
VHOST_USER_PROTOCOL_F_LOG_SHMFD);
}
const VhostOps user_ops = {
.backend_type = VHOST_BACKEND_TYPE_USER,
.vhost_call = vhost_user_call,
@ -467,4 +476,5 @@ const VhostOps user_ops = {
.vhost_backend_set_vring_enable = vhost_user_set_vring_enable,
.vhost_backend_memslots_limit = vhost_user_memslots_limit,
.vhost_set_log_base = vhost_set_log_base,
.vhost_requires_shm_log = vhost_user_requires_shm_log,
};

4
include/hw/virtio/vhost-backend.h
View File

@ -11,6 +11,8 @@
#ifndef VHOST_BACKEND_H_
#define VHOST_BACKEND_H_
#include <stdbool.h>
typedef enum VhostBackendType {
VHOST_BACKEND_TYPE_NONE = 0,
VHOST_BACKEND_TYPE_KERNEL = 1,
@ -29,6 +31,7 @@ typedef int (*vhost_backend_set_vring_enable)(struct vhost_dev *dev, int enable)
typedef int (*vhost_backend_memslots_limit)(struct vhost_dev *dev);
typedef int (*vhost_set_log_base_op)(struct vhost_dev *dev, uint64_t base);
typedef bool (*vhost_requires_shm_log_op)(struct vhost_dev *dev);
typedef struct VhostOps {
VhostBackendType backend_type;
@ -39,6 +42,7 @@ typedef struct VhostOps {
vhost_backend_set_vring_enable vhost_backend_set_vring_enable;
vhost_backend_memslots_limit vhost_backend_memslots_limit;
vhost_set_log_base_op vhost_set_log_base;
vhost_requires_shm_log_op vhost_requires_shm_log;
} VhostOps;
extern const VhostOps user_ops;