From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 42394C4338F for ; Thu, 29 Jul 2021 19:22:32 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 0822560560 for ; Thu, 29 Jul 2021 19:22:31 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 0822560560 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=nongnu.org Received: from localhost ([::1]:60988 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m9Bby-0001wd-N6 for qemu-devel@archiver.kernel.org; Thu, 29 Jul 2021 15:22:30 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:41612) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m9BZ3-0006Dn-G1 for qemu-devel@nongnu.org; Thu, 29 Jul 2021 15:19:29 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:32804) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m9BZ2-0005ad-1t for qemu-devel@nongnu.org; Thu, 29 Jul 2021 15:19:29 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1627586366; 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: in-reply-to:in-reply-to:references:references; bh=BxJIOvxN6/904s3i8r5luoZt/VaoWyeQ9KkEYOJWTPk=; b=hehKNgnc+1vJIAcCB4ieKMZ+QgiO7OEO+2OEHdSEPsAy8di8sckdmgd61INyhGVewXdFW4 4U5FmNchY5P4JvXztDwVJZbieDBbJMOQ02AbcF/vQvi/HcPanxXv2DgvRJ1N7Ahqja3q1E zkv1lkmcwEd0ewTqci2A1Z+HPXUh5KY= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-325-qo7vUl55M5OYccKxVEeEuw-1; Thu, 29 Jul 2021 15:19:22 -0400 X-MC-Unique: qo7vUl55M5OYccKxVEeEuw-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id D11BF1015184 for ; Thu, 29 Jul 2021 19:19:21 +0000 (UTC) Received: from thinkpad.redhat.com (unknown [10.39.192.222]) by smtp.corp.redhat.com (Postfix) with ESMTP id 88D5E6E0B7; Thu, 29 Jul 2021 19:19:20 +0000 (UTC) From: Laurent Vivier To: qemu-devel@nongnu.org Subject: [PATCH 1/2] virtio: add a way to disable a queue Date: Thu, 29 Jul 2021 21:19:09 +0200 Message-Id: <20210729191910.317114-2-lvivier@redhat.com> In-Reply-To: <20210729191910.317114-1-lvivier@redhat.com> References: <20210729191910.317114-1-lvivier@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=lvivier@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII" Received-SPF: pass client-ip=216.205.24.124; envelope-from=lvivier@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -34 X-Spam_score: -3.5 X-Spam_bar: --- X-Spam_report: (-3.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.717, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Juan Quintela , Jason Wang , Jens Freimann , "Michael S. Tsirkin" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Add virtio_queue_disable()/virtio_queue_enable() to disable/enable a queue by setting vring.num to 0 (or num_default). This is needed to be able to disable a guest driver from the host side Signed-off-by: Laurent Vivier --- include/hw/virtio/virtio.h | 2 ++ hw/virtio/virtio.c | 10 ++++++++++ 2 files changed, 12 insertions(+) diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h index 8bab9cfb7507..6a3f71b4cd88 100644 --- a/include/hw/virtio/virtio.h +++ b/include/hw/virtio/virtio.h @@ -251,6 +251,8 @@ void virtio_config_modern_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data); void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr); hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n); +void virtio_queue_enable(VirtIODevice *vdev, int n); +void virtio_queue_disable(VirtIODevice *vdev, int n); void virtio_queue_set_num(VirtIODevice *vdev, int n, int num); int virtio_queue_get_num(VirtIODevice *vdev, int n); int virtio_queue_get_max_num(VirtIODevice *vdev, int n); diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index 874377f37a70..fa5228c1a2d6 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -2244,6 +2244,16 @@ void virtio_queue_set_rings(VirtIODevice *vdev, int n, hwaddr desc, virtio_init_region_cache(vdev, n); } +void virtio_queue_disable(VirtIODevice *vdev, int n) +{ + vdev->vq[n].vring.num = 0; +} + +void virtio_queue_enable(VirtIODevice *vdev, int n) +{ + vdev->vq[n].vring.num = vdev->vq[n].vring.num_default; +} + void virtio_queue_set_num(VirtIODevice *vdev, int n, int num) { /* Don't allow guest to flip queue between existent and -- 2.31.1