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Fri, 07 Jun 2024 09:50:35 -0400 X-MC-Unique: d-G4g3OGNDuDVSI3W7QFzg-1 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 1DF221955DDF; Fri, 7 Jun 2024 13:50:34 +0000 (UTC) Received: from [10.39.208.30] (unknown [10.39.208.30]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 0034230000C4; Fri, 7 Jun 2024 13:50:31 +0000 (UTC) Message-ID: Date: Fri, 7 Jun 2024 15:50:28 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] vhost: cleanup resubmit info before inflight setup To: Haoqian He Cc: chenbox@nvidia.com, dev@dpdk.org, fengli@smartx.com, stable@dpdk.org References: <8a04f203-4ef0-4840-b480-b21e08561c7d@redhat.com> <20240426110947.881407-1-haoqian.he@smartx.com> From: Maxime Coquelin Autocrypt: addr=maxime.coquelin@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: stable-bounces@dpdk.org On 4/26/24 13:09, Haoqian He wrote: > This patch fixes a potential VM hang bug when the VM reboots after > vhost live recovery due to missing cleanup virtqueue resubmit info. > > Specifically, if inflight IO that should be resubmitted during > the latest vhost reconnection has not been submitted yet while > VM rebooting, so GET_VRING_BASE would not wait for the inflight > IO, at this time the resubmit info has been. When the VM restarts, > SET_VRING_KICK will resubmit the inflight IO (If resubmit info > is not null, function set_vring_kick will return without updating > resubmit info). > > It’s an error, any stale inflight IO should not be resubmitted > after the VM restart. > > The solution is to clean up virtqueue resubmit info when function > set_inflight_fd before function set_vring_kick. > > Fixes: ad0a4ae491fe ("vhost: checkout resubmit inflight information") > Cc: stable@dpdk.org > > Signed-off-by: Haoqian He > --- > v2: rewrite the commit message. > > lib/vhost/vhost_user.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/lib/vhost/vhost_user.c b/lib/vhost/vhost_user.c > index 414192500e..7c54afc5fb 100644 > --- a/lib/vhost/vhost_user.c > +++ b/lib/vhost/vhost_user.c > @@ -1871,6 +1871,7 @@ vhost_user_set_inflight_fd(struct virtio_net **pdev, > if (!vq) > continue; > > + cleanup_vq_inflight(dev, vq); > if (vq_is_packed(dev)) { > vq->inflight_packed = addr; > vq->inflight_packed->desc_num = queue_size; Reviewed-by: Maxime Coquelin Thanks, Maxime