Re: [Qemu-devel] [PATCH 3/5] vring: use hostmem's RAM safe api

[Stefan Hajnoczi]

On Mon, Apr 01, 2013 at 04:20:32PM +0800, Liu Ping Fan wrote:
> @@ -51,7 +50,7 @@ bool vring_setup(Vring *vring, VirtIODevice *vdev, int n)
>  
>  void vring_teardown(Vring *vring)
>  {
> -    hostmem_finalize(&vring->hostmem);
> +    memory_region_unref(vring->vring_mr);
>  }

dataplane keeps a reference to the vring.  This prevents memory hot
unplug while the device is up.  If this is a problem we'll have to
reduce the lifespan of the vring mapping.

Stefan