From patchwork Thu May 19 14:59:19 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Eugenio Perez Martin X-Patchwork-Id: 12855237 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C8735C433FE for ; Thu, 19 May 2022 15:01:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240227AbiESPBp (ORCPT ); Thu, 19 May 2022 11:01:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41896 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240301AbiESPAK (ORCPT ); Thu, 19 May 2022 11:00:10 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 2E9E2EBA9F for ; Thu, 19 May 2022 07:59:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1652972368; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=vLDeLvmK1CDBbyiav0ZvmXrDMQAvb2K5oFXxMwO8ya4=; b=gh+0ihE8gXlG3FJeaAEqx2LL+Y/TKfdCwQPQgH1KuTpRDE7siSX2PbB/a3nzZ8TbKOy0Va l1EI/PN7MT4LvZqUaiWWABsSdMv51wMqYnu8jPOTTjuUyqGuq8z5VmwakGh2aX51kar6J3 jqGvwwo7pJ9CJJ7b5CJME9Qn17nGeCc= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-661-Q7coxSBeOFSsVPOL9aBFtQ-1; Thu, 19 May 2022 10:59:24 -0400 X-MC-Unique: Q7coxSBeOFSsVPOL9aBFtQ-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 7F881294EDE4; Thu, 19 May 2022 14:59:23 +0000 (UTC) Received: from eperezma.remote.csb (unknown [10.39.193.126]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2F566400E89E; Thu, 19 May 2022 14:59:21 +0000 (UTC) From: =?utf-8?q?Eugenio_P=C3=A9rez?= To: mst@redhat.com, jasowang@redhat.com Cc: lvivier@redhat.com, netdev@vger.kernel.org, lulu@redhat.com, eli@mellanox.com, sgarzare@redhat.com, parav@nvidia.com, virtualization@lists.linux-foundation.org, kvm@vger.kernel.org, lingshan.zhu@intel.com, linux-kernel@vger.kernel.org, gdawar@xilinx.com Subject: [PATCH v2] vdpasim: allow to enable a vq repeatedly Date: Thu, 19 May 2022 16:59:19 +0200 Message-Id: <20220519145919.772896-1-eperezma@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.11.54.1 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Code must be resilient to enable a queue many times. At the moment the queue is resetting so it's definitely not the expected behavior. v2: set vq->ready = 0 at disable. Fixes: 2c53d0f64c06 ("vdpasim: vDPA device simulator") Cc: stable@vger.kernel.org Signed-off-by: Eugenio Pérez Reviewed-by: Stefano Garzarella --- drivers/vdpa/vdpa_sim/vdpa_sim.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c index ddbe142af09a..881f9864c437 100644 --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c @@ -353,11 +353,14 @@ static void vdpasim_set_vq_ready(struct vdpa_device *vdpa, u16 idx, bool ready) { struct vdpasim *vdpasim = vdpa_to_sim(vdpa); struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx]; + bool old_ready; spin_lock(&vdpasim->lock); + old_ready = vq->ready; vq->ready = ready; - if (vq->ready) + if (vq->ready && !old_ready) { vdpasim_queue_ready(vdpasim, idx); + } spin_unlock(&vdpasim->lock); }