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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id CCCF9C4332F for ; Mon, 19 Dec 2022 21:38:15 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1p7NpO-0004SK-CT; Mon, 19 Dec 2022 16:37:42 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1p7NpN-0004S9-8N for qemu-devel@nongnu.org; Mon, 19 Dec 2022 16:37:41 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1p7NpK-0004T1-Ry for qemu-devel@nongnu.org; Mon, 19 Dec 2022 16:37:40 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1671485857; 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: in-reply-to:in-reply-to:references:references; bh=sdDHqDRS9SmfDnZoz6MoHoTHy9WCTHAs8frHvevFrjE=; b=VV80B6BT7ivHFqR/wZMVuRrpqBHsRoNVqRO7WEeNcXgGiJ2V/4PvzIRK5/UHMddXOzjbQN NwdasKaNYSNBVaBzZh5PE6+NuYvpGR9pviwqloMJp94xqRTWf9wNh+MJjIY4wqbONRSRAP JdpvlZ+++3tdRCXNeEbhfJ0uOSk0AhQ= Received: from mail-qv1-f69.google.com (mail-qv1-f69.google.com [209.85.219.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_128_GCM_SHA256) id us-mta-606-SxiCY7SbOmqHH1aIvgYc_w-1; Mon, 19 Dec 2022 16:37:36 -0500 X-MC-Unique: SxiCY7SbOmqHH1aIvgYc_w-1 Received: by mail-qv1-f69.google.com with SMTP id o13-20020a056214108d00b004c6fb4f16dcso6145406qvr.6 for ; Mon, 19 Dec 2022 13:37:36 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=sdDHqDRS9SmfDnZoz6MoHoTHy9WCTHAs8frHvevFrjE=; b=e5KEvl7AaU+KOZDxIL0nq+0z89LwOP66+mMHIFB20D7MAcBE2xfmXfep7d1TyyVoOB cW6bRAd74t7ato1Z22gkaex6k+qGZpXcdXKo79rlSbVgo9lwp9tIINNX2L3pcI9HrWeE erSnifH1d94nYEnIcbta/or+gnIzwlNueOxcKJ+aAZSsdfDXDYys7iwWCRw4wwxGQ/8W f6MinNWTji/4mC06B3svA498uAR755SAuZY+LvNhnKh9XVy5m0m6qf2XDwHr5B/zDTWv 2qwf/c3Lej5yiFgL0yAWfPpQgx999EMW/R+l54GhfsnGfq05jyWegSgjWLE+PM38Yxb7 xr9A== X-Gm-Message-State: ANoB5pleu6SUwbsAd9ub28FyB/IQETQCepFqNOMvHBC+kZlPXH60sHkV 2BwgWgUB5NwiKC803QZWnQBNBq/8hOum6yDD51sxTMOVzwtgM7Lo+bBznqzbDyMX/wSAojbNWR7 2nO+WQp4ybb3sSOU= X-Received: by 2002:ac8:764b:0:b0:3a6:a89d:9ee with SMTP id i11-20020ac8764b000000b003a6a89d09eemr66160689qtr.33.1671485855785; Mon, 19 Dec 2022 13:37:35 -0800 (PST) X-Google-Smtp-Source: AA0mqf7FAIP9bz7zcBB/RVtfwtgbOA8ddeKq/PJJgTAdz3UWJ2qTLBnWJ8HlyO7+20z63DNJQoL+FQ== X-Received: by 2002:ac8:764b:0:b0:3a6:a89d:9ee with SMTP id i11-20020ac8764b000000b003a6a89d09eemr66160659qtr.33.1671485855526; Mon, 19 Dec 2022 13:37:35 -0800 (PST) Received: from redhat.com ([45.144.113.29]) by smtp.gmail.com with ESMTPSA id c8-20020ac81108000000b003996aa171b9sm6462454qtj.97.2022.12.19.13.37.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Dec 2022 13:37:34 -0800 (PST) Date: Mon, 19 Dec 2022 16:37:29 -0500 From: "Michael S. Tsirkin" To: Jason Wang Cc: "Longpeng(Mike)" , stefanha@redhat.com, sgarzare@redhat.com, cohuck@redhat.com, pbonzini@redhat.com, arei.gonglei@huawei.com, yechuan@huawei.com, huangzhichao@huawei.com, qemu-devel@nongnu.org Subject: Re: [PATCH v11 5/5] docs: Add generic vhost-vdpa device documentation Message-ID: <20221219163711-mutt-send-email-mst@kernel.org> References: <20221215134944.2809-1-longpeng2@huawei.com> <20221215134944.2809-6-longpeng2@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Received-SPF: pass client-ip=170.10.133.124; envelope-from=mst@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Fri, Dec 16, 2022 at 11:33:49AM +0800, Jason Wang wrote: > On Thu, Dec 15, 2022 at 9:50 PM Longpeng(Mike) wrote: > > > > From: Longpeng > > > > Signed-off-by: Longpeng > > --- > > .../devices/vhost-vdpa-generic-device.rst | 68 +++++++++++++++++++ > > 1 file changed, 68 insertions(+) > > create mode 100644 docs/system/devices/vhost-vdpa-generic-device.rst > > > > diff --git a/docs/system/devices/vhost-vdpa-generic-device.rst b/docs/system/devices/vhost-vdpa-generic-device.rst > > new file mode 100644 > > index 0000000000..24c825ef1a > > --- /dev/null > > +++ b/docs/system/devices/vhost-vdpa-generic-device.rst > > @@ -0,0 +1,68 @@ > > + > > +========================= > > +vhost-vDPA generic device > > +========================= > > + > > +This document explains the usage of the vhost-vDPA generic device. > > + > > + > > +Description > > +----------- > > + > > +vDPA(virtio data path acceleration) device is a device that uses a datapath > > +which complies with the virtio specifications with vendor specific control > > +path. > > + > > +QEMU provides two types of vhost-vDPA devices to enable the vDPA device, one > > +is type sensitive which means QEMU needs to know the actual device type > > +(e.g. net, blk, scsi) and another is called "vhost-vDPA generic device" which > > +is type insensitive. > > + > > +The vhost-vDPA generic device builds on the vhost-vdpa subsystem and virtio > > +subsystem. It is quite small, but it can support any type of virtio device. > > + > > + > > +Requirements > > +------------ > > +Linux 5.18+ > > +iproute2/vdpa 5.12.0+ > > + > > + > > +Examples > > +-------- > > + > > +1. Prepare the vhost-vDPA backends, here is an example using vdpa_sim_blk > > + device: > > + > > +:: > > + host# modprobe vhost_vdpa > > + host# modprobe vdpa_sim_blk > > Nit: it's probably better to add driver binding steps here. > > > + host# vdpa dev add mgmtdev vdpasim_blk name blk0 > > + (...you can see the vhost-vDPA device under /dev directory now...) > > And then the vhost char dev name could be fetch via > > ls /sys/bus/vdpa/device/blk0/vhost-vdpa* > > With the above changes. > > Acked-by: Jason Wang > > Thanks Sounds minor enough, I'll queue, pls fix with a patch on top. > > + host# ls -l /dev/vhost-vdpa-* > > + crw------- 1 root root 236, 0 Nov 2 00:49 /dev/vhost-vdpa-0 > > + > > +Note: > > +It needs some vendor-specific steps to provision the vDPA device if you're > > +using real HW devices, such as loading the vendor-specific vDPA driver and > > +binding the device to the driver. > > + > > + > > +2. Start the virtual machine: > > + > > +Start QEMU with virtio-mmio bus: > > + > > +:: > > + host# qemu-system \ > > + -M microvm -m 512 -smp 2 -kernel ... -initrd ... \ > > + -device vhost-vdpa-device,vhostdev=/dev/vhost-vdpa-0 \ > > + ... > > + > > + > > +Start QEMU with virtio-pci bus: > > + > > +:: > > + host# qemu-system \ > > + -M pc -m 512 -smp 2 \ > > + -device vhost-vdpa-device-pci,vhostdev=/dev/vhost-vdpa-0 \ > > + ... > > -- > > 2.23.0 > >