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vhost: add helper to check if a vq has been setup

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This adds a helper check if a vq has been setup. The next patches
will use this when we move the vhost scsi cmd preallocation from per
session to per vq. In the per vq case, we only want to allocate cmds
for vqs that have actually been setup and not for all the possible
vqs.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
Link: https://lore.kernel.org/r/1604986403-4931-2-git-send-email-michael.christie@oracle.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Mike Christie 2020-11-09 23:33:19 -06:00 committed by Michael S. Tsirkin
parent a312db697c
commit 6bcf34224a
2 changed files with 7 additions and 0 deletions
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6
drivers/vhost/vhost.c
View File

@ -304,6 +304,12 @@ static void vhost_vring_call_reset(struct vhost_vring_call *call_ctx)
memset(&call_ctx->producer, 0x0, sizeof(struct irq_bypass_producer));
}
bool vhost_vq_is_setup(struct vhost_virtqueue *vq)
{
return vq->avail && vq->desc && vq->used && vhost_vq_access_ok(vq);
}
EXPORT_SYMBOL_GPL(vhost_vq_is_setup);
static void vhost_vq_reset(struct vhost_dev *dev,
struct vhost_virtqueue *vq)
{

1
drivers/vhost/vhost.h
View File

@ -190,6 +190,7 @@ int vhost_get_vq_desc(struct vhost_virtqueue *,
struct vhost_log *log, unsigned int *log_num);
void vhost_discard_vq_desc(struct vhost_virtqueue *, int n);
bool vhost_vq_is_setup(struct vhost_virtqueue *vq);
int vhost_vq_init_access(struct vhost_virtqueue *);
int vhost_add_used(struct vhost_virtqueue *, unsigned int head, int len);
int vhost_add_used_n(struct vhost_virtqueue *, struct vring_used_elem *heads,