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authorMike Christie <michael.christie@oracle.com>2020-11-09 23:33:19 -0600
committerMichael S. Tsirkin <mst@redhat.com>2020-11-15 17:30:54 -0500
commit6bcf34224ac1e94103797fd68b9836061762f2b2 (patch)
tree9be5121f1c876cda5b7172a121820a25fd65d153 /drivers/vhost
parenta312db697cb05dfa781848afe8585a1e1f2a5a99 (diff)
vhost: add helper to check if a vq has been setup
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>
Diffstat (limited to 'drivers/vhost')
-rw-r--r--drivers/vhost/vhost.c6
-rw-r--r--drivers/vhost/vhost.h1
2 files changed, 7 insertions, 0 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 5c835a292783..a262e12c6dc2 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -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)
{
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index e016cd3fa02f..b063324c7669 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -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,