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Mon, 11 Mar 2024 06:16:45 -0400 X-MC-Unique: 4gzUC2ACOdeIFX3BUEJcnQ-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) (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 mimecast-mx02.redhat.com (Postfix) with ESMTPS id AD1CA3C0DF6C; Mon, 11 Mar 2024 10:16:44 +0000 (UTC) Received: from [10.39.208.26] (unknown [10.39.208.26]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 91D9FC041EF; Mon, 11 Mar 2024 10:16:43 +0000 (UTC) Message-ID: <0d97733e-53fe-4cc5-a5ba-24c590ece31d@redhat.com> Date: Mon, 11 Mar 2024 11:16:41 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] vhost: fix vring addr update with vDPA To: David Marchand , dev@dpdk.org Cc: ssimma@nvidia.com, Chenbo Xia , Eelco Chaudron References: <20240307103443.609960-1-david.marchand@redhat.com> From: Maxime Coquelin Autocrypt: addr=maxime.coquelin@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org On 3/7/24 11:34, David Marchand wrote: > For vDPA devices, vq are not locked once the device has been configured > at runtime. > > On the other hand, we need to hold the vq lock to evaluate vq->access_ok, > invalidate vring addresses and translate them. > > Move vring address update earlier and, when vDPA is configured, skip parts > which expect lock to be taken. > > Bugzilla ID: 1394 > Fixes: 741dc052eaf9 ("vhost: annotate virtqueue access checks") > > Signed-off-by: David Marchand > --- > No change, just resending for CI. > > --- > lib/vhost/vhost_user.c | 14 +++++++++----- > 1 file changed, 9 insertions(+), 5 deletions(-) > > diff --git a/lib/vhost/vhost_user.c b/lib/vhost/vhost_user.c > index 3aba32c95a..7fe1687f08 100644 > --- a/lib/vhost/vhost_user.c > +++ b/lib/vhost/vhost_user.c > @@ -986,17 +986,20 @@ vhost_user_set_vring_addr(struct virtio_net **pdev, > /* addr->index refers to the queue index. The txq 1, rxq is 0. */ > vq = dev->virtqueue[ctx->msg.payload.addr.index]; > > - /* vhost_user_lock_all_queue_pairs locked all qps */ > - VHOST_USER_ASSERT_LOCK(dev, vq, VHOST_USER_SET_VRING_ADDR); > - > - access_ok = vq->access_ok; > - > /* > * Rings addresses should not be interpreted as long as the ring is not > * started and enabled > */ > memcpy(&vq->ring_addrs, addr, sizeof(*addr)); > > + if (dev->flags & VIRTIO_DEV_VDPA_CONFIGURED) > + goto out; > + > + /* vhost_user_lock_all_queue_pairs locked all qps */ > + VHOST_USER_ASSERT_LOCK(dev, vq, VHOST_USER_SET_VRING_ADDR); > + > + access_ok = vq->access_ok; > + > vring_invalidate(dev, vq); > > if ((vq->enabled && (dev->features & > @@ -1006,6 +1009,7 @@ vhost_user_set_vring_addr(struct virtio_net **pdev, > *pdev = dev; > } > > +out: > return RTE_VHOST_MSG_RESULT_OK; > } > Reviewed-by: Maxime Coquelin Thanks, Maxime