From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755614Ab3ILRpn (ORCPT ); Thu, 12 Sep 2013 13:45:43 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:56774 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754621Ab3ILRpj (ORCPT ); Thu, 12 Sep 2013 13:45:39 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jason Wang , "Michael S. Tsirkin" Subject: [ 17/23] vhost: zerocopy: poll vq in zerocopy callback Date: Thu, 12 Sep 2013 10:45:13 -0700 Message-Id: <20130912174453.622798288@linuxfoundation.org> X-Mailer: git-send-email 1.8.4.3.gca3854a In-Reply-To: <20130912174451.748805761@linuxfoundation.org> References: <20130912174451.748805761@linuxfoundation.org> User-Agent: quilt/0.60-5.1.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jason Wang commit c70aa540c7a9f67add11ad3161096fb95233aa2e upstream. We add used and signal guest in worker thread but did not poll the virtqueue during the zero copy callback. This may lead the missing of adding and signalling during zerocopy. Solve this by polling the virtqueue and let it wakeup the worker during callback. Signed-off-by: Jason Wang Signed-off-by: Michael S. Tsirkin Signed-off-by: Greg Kroah-Hartman --- drivers/vhost/vhost.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -1603,6 +1603,7 @@ void vhost_zerocopy_callback(struct ubuf struct vhost_ubuf_ref *ubufs = ubuf->ctx; struct vhost_virtqueue *vq = ubufs->vq; + vhost_poll_queue(&vq->poll); /* set len = 1 to mark this desc buffers done DMA */ vq->heads[ubuf->desc].len = VHOST_DMA_DONE_LEN; kref_put(&ubufs->kref, vhost_zerocopy_done_signal);