vhost: add helper to check if a vq has been setup (6bcf3422) · Commits · 戴 / test

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>

drivers/vhost/vhost.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -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)
		{

drivers/vhost/vhost.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -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,

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