From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:55302 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752372AbcKHKhQ (ORCPT ); Tue, 8 Nov 2016 05:37:16 -0500 Subject: Patch "hv: do not lose pending heartbeat vmbus packets" has been added to the 4.4-stable tree To: longli@microsoft.com, gregkh@linuxfoundation.org, kys@microsoft.com Cc: , From: Date: Tue, 08 Nov 2016 11:36:25 +0100 Message-ID: <1478601385214149@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled hv: do not lose pending heartbeat vmbus packets to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: hv-do-not-lose-pending-heartbeat-vmbus-packets.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 407a3aee6ee2d2cb46d9ba3fc380bc29f35d020c Mon Sep 17 00:00:00 2001 From: Long Li Date: Wed, 5 Oct 2016 16:57:46 -0700 Subject: hv: do not lose pending heartbeat vmbus packets From: Long Li commit 407a3aee6ee2d2cb46d9ba3fc380bc29f35d020c upstream. The host keeps sending heartbeat packets independent of the guest responding to them. Even though we respond to the heartbeat messages at interrupt level, we can have situations where there maybe multiple heartbeat messages pending that have not been responded to. For instance this occurs when the VM is paused and the host continues to send the heartbeat messages. Address this issue by draining and responding to all the heartbeat messages that maybe pending. Signed-off-by: Long Li Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman --- drivers/hv/hv_util.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) --- a/drivers/hv/hv_util.c +++ b/drivers/hv/hv_util.c @@ -283,10 +283,14 @@ static void heartbeat_onchannelcallback( u8 *hbeat_txf_buf = util_heartbeat.recv_buffer; struct icmsg_negotiate *negop = NULL; - vmbus_recvpacket(channel, hbeat_txf_buf, - PAGE_SIZE, &recvlen, &requestid); + while (1) { + + vmbus_recvpacket(channel, hbeat_txf_buf, + PAGE_SIZE, &recvlen, &requestid); + + if (!recvlen) + break; - if (recvlen > 0) { icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[ sizeof(struct vmbuspipe_hdr)]; Patches currently in stable-queue which might be from longli@microsoft.com are queue-4.4/hv-do-not-lose-pending-heartbeat-vmbus-packets.patch