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vhost: add vhost_has_free_slot() interface

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it will allow for other parts of QEMU check if it's safe
to map memory region during hotplug/runtime.
That way hotplug path will have a chance to cancel
hotplug operation instead of crashing in vhost_commit().

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Igor Mammedov 2015-10-06 10:37:27 +02:00 • committed by Michael S. Tsirkin
parent 052bd52fa9
commit 2ce68e4cf5
7 changed files with 57 additions and 0 deletions
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2
include/hw/virtio/vhost-backend.h
View file

@ -26,6 +26,7 @@ typedef int (*vhost_backend_init)(struct vhost_dev *dev, void *opaque);
typedef int (*vhost_backend_cleanup)(struct vhost_dev *dev);
typedef int (*vhost_backend_get_vq_index)(struct vhost_dev *dev, int idx);
typedef int (*vhost_backend_set_vring_enable)(struct vhost_dev *dev, int enable);
typedef int (*vhost_backend_memslots_limit)(struct vhost_dev *dev);
typedef struct VhostOps {
VhostBackendType backend_type;
@ -34,6 +35,7 @@ typedef struct VhostOps {
vhost_backend_cleanup vhost_backend_cleanup;
vhost_backend_get_vq_index vhost_backend_get_vq_index;
vhost_backend_set_vring_enable vhost_backend_set_vring_enable;
vhost_backend_memslots_limit vhost_backend_memslots_limit;
} VhostOps;
extern const VhostOps user_ops;

2
include/hw/virtio/vhost.h
View file

@ -59,6 +59,7 @@ struct vhost_dev {
const VhostOps *vhost_ops;
void *opaque;
struct vhost_log *log;
QLIST_ENTRY(vhost_dev) entry;
};
int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
@ -83,4 +84,5 @@ uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits,
uint64_t features);
void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits,
uint64_t features);
bool vhost_has_free_slot(void);
#endif