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=-10.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, 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 7658EC2BBD4 for ; Thu, 17 Dec 2020 22:30:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5F411239FE for ; Thu, 17 Dec 2020 22:30:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732124AbgLQWaT (ORCPT ); Thu, 17 Dec 2020 17:30:19 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:39200 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731896AbgLQWaR (ORCPT ); Thu, 17 Dec 2020 17:30:17 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1608244130; 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=58zzpY7XaS7togsNrnMmm2GBFEi7wUVM3uCWPqvyUwM=; b=TzsxKdi9G893sR5doeXcQc90kyEMjvdi1HCwkF4vtssqGDo02i7HS6IS37R/Nft+FQErWj IM3VfhrXi496fBC14tG8wodHQAh3xMMgpX6LZE01+SCGeyQoSGznx9HW+KPqafkVtMtweA qtUMNwTuqDE/o4DNCpD7nfQ/j/6lDmc= Received: from mail-wr1-f69.google.com (mail-wr1-f69.google.com [209.85.221.69]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-192-virJZG4UPQ69XlaaBMjvbg-1; Thu, 17 Dec 2020 17:28:47 -0500 X-MC-Unique: virJZG4UPQ69XlaaBMjvbg-1 Received: by mail-wr1-f69.google.com with SMTP id j5so206304wro.12 for ; Thu, 17 Dec 2020 14:28:47 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to; bh=58zzpY7XaS7togsNrnMmm2GBFEi7wUVM3uCWPqvyUwM=; b=MxZOttJ4rGuMl7MuvZ1fQj8cZGGwFVn3YfwYql3YNpYSG9uw8gA8au5XtE7j+dTR3A h2yh/KbCyMV1sxE0dz/OTiTnWpNx2Nl/q3KKxF2EftgU9oyg6RcOCmCb4sZgzFpNOAhF wMPKhiEnxm0KVLUVIZLCzartDgno3NfDYimUIbV9EQGmSvMeCg5z0D0ECGMe/iglO58h Y+EnNkcDraGhQnufV2INjvfj1Tt0vOZeYv3ZcPpVklj6R7/OEiCDg+6kkndqh1IWoQIL G6Z4/MzD2/fTcUWcRqIXCcjkv7wb0W8mYBTP/itItwfgby4+7ZshwLAEBmgHtP1SW6yQ dTRQ== X-Gm-Message-State: AOAM533K/+aSwm8csk/+yrRNZcRDbONIlpVzkbSrN2AH/TGA3dxDeAaf T+MTRnicBWCoIeRda+Ijdva62CnQMVh8D6V8XcdLQxe08H6VoetDRD0iuYECOdvhCsdXUi5EMSQ l1240dbCjH4tP090+AsEW9a2q X-Received: by 2002:adf:c14d:: with SMTP id w13mr945873wre.383.1608244126284; Thu, 17 Dec 2020 14:28:46 -0800 (PST) X-Google-Smtp-Source: ABdhPJwXH+tSLfbkxm992xXi5qFe0fwVAsilQe7lLeI6dI1MaxVBeZ2h6PQEjZgPCKlyiojqp6iwZw== X-Received: by 2002:adf:c14d:: with SMTP id w13mr945856wre.383.1608244126055; Thu, 17 Dec 2020 14:28:46 -0800 (PST) Received: from redhat.com (bzq-79-178-32-166.red.bezeqint.net. [79.178.32.166]) by smtp.gmail.com with ESMTPSA id d8sm9381263wmb.11.2020.12.17.14.28.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Dec 2020 14:28:44 -0800 (PST) Date: Thu, 17 Dec 2020 17:28:41 -0500 From: "Michael S. Tsirkin" To: Jason Wang Cc: eperezma@redhat.com, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, lulu@redhat.com, eli@mellanox.com, lingshan.zhu@intel.com, rob.miller@broadcom.com, stefanha@redhat.com, sgarzare@redhat.com Subject: Re: [PATCH 00/21] Control VQ support in vDPA Message-ID: <20201217163513-mutt-send-email-mst@kernel.org> References: <20201216064818.48239-1-jasowang@redhat.com> <20201216044051-mutt-send-email-mst@kernel.org> <20201217025410-mutt-send-email-mst@kernel.org> <61b60985-142b-10f2-58b8-1d9f57c0cfca@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <61b60985-142b-10f2-58b8-1d9f57c0cfca@redhat.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Dec 17, 2020 at 05:02:49PM +0800, Jason Wang wrote: > > On 2020/12/17 下午3:58, Michael S. Tsirkin wrote: > > On Thu, Dec 17, 2020 at 11:30:18AM +0800, Jason Wang wrote: > > > On 2020/12/16 下午5:47, Michael S. Tsirkin wrote: > > > > On Wed, Dec 16, 2020 at 02:47:57PM +0800, Jason Wang wrote: > > > > > Hi All: > > > > > > > > > > This series tries to add the support for control virtqueue in vDPA. > > > > > > > > > > Control virtqueue is used by networking device for accepting various > > > > > commands from the driver. It's a must to support multiqueue and other > > > > > configurations. > > > > > > > > > > When used by vhost-vDPA bus driver for VM, the control virtqueue > > > > > should be shadowed via userspace VMM (Qemu) instead of being assigned > > > > > directly to Guest. This is because Qemu needs to know the device state > > > > > in order to start and stop device correctly (e.g for Live Migration). > > > > > > > > > > This requies to isolate the memory mapping for control virtqueue > > > > > presented by vhost-vDPA to prevent guest from accesing it directly. > > > > > To achieve this, vDPA introduce two new abstractions: > > > > > > > > > > - address space: identified through address space id (ASID) and a set > > > > > of memory mapping in maintained > > > > > - virtqueue group: the minimal set of virtqueues that must share an > > > > > address space > > > > How will this support the pretty common case where control vq > > > > is programmed by the kernel through the PF, and others by the VFs? > > > > > > In this case, the VF parent need to provide a software control vq and decode > > > the command then send them to VF. > > > > But how does that tie to the address space infrastructure? > > > In this case, address space is not a must. That's ok, problem is I don't see how address space is going to work in this case at all. There's no address space there that userspace/guest can control. > But the idea is to make control > vq works for all types of hardware: > > 1) control virtqueue is implemented via VF/PF communication > 2) control virtqueue is implemented by VF but not through DMA > 3) control virtqueue is implemented by VF DMA, it could be either a hardware > control virtqueue or other type of DMA > > The address space is a must for 3) to work and can work for both 1) and 2). > > > > > > > > > > > > > > > > I actually thought the way to support it is by exposing > > > > something like an "inject buffers" API which sends data to a given VQ. > > > > Maybe an ioctl, and maybe down the road uio ring can support batching > > > > these .... > > > > > > So the virtuqueue allows the request to be processed asynchronously (e.g > > > driver may choose to use interrupt for control vq). This means we need to > > > support that in uAPI level. > > I don't think we need to make it async, just a regular ioctl will do. > > In fact no guest uses the asynchronous property. > > > It was not forbidden by the spec then we need to support that. E.g we can > not assume driver doesn't assign interrupt for cvq. > > > > > > > > > And if we manage to do that, it's just another > > > type of virtqueue. > > > > > > For virtio-vDPA, this also means the extensions for queue processing which > > > is a functional duplication. > > I don't see why, just send it to the actual control vq :) > > > But in the case you've pointed out, there's no hardware control vq in fact. > > > > > > > Using what proposed in this series, we don't > > > need any changes for kernel virtio drivers. > > > > > > What's more important, this series could be used for future features that > > > requires DMA isolation between virtqueues: > > > > > > - report dirty pages via virtqueue > > > - sub function level device slicing > > > > I agree these are nice to have, but I am not sure basic control vq must > > be tied to that. > > > If the control virtqueue is implemented via DMA through VF, it looks like a > must. > > Thanks > > > > > > > ... > > > > > > Thanks > > > > > > > > > > > > > > > Device needs to advertise the following attributes to vDPA: > > > > > > > > > > - the number of address spaces supported in the device > > > > > - the number of virtqueue groups supported in the device > > > > > - the mappings from a specific virtqueue to its virtqueue groups > > > > > > > > > > The mappings from virtqueue to virtqueue groups is fixed and defined > > > > > by vDPA device driver. E.g: > > > > > > > > > > - For the device that has hardware ASID support, it can simply > > > > > advertise a per virtqueue virtqueue group. > > > > > - For the device that does not have hardware ASID support, it can > > > > > simply advertise a single virtqueue group that contains all > > > > > virtqueues. Or if it wants a software emulated control virtqueue, it > > > > > can advertise two virtqueue groups, one is for cvq, another is for > > > > > the rest virtqueues. > > > > > > > > > > vDPA also allow to change the association between virtqueue group and > > > > > address space. So in the case of control virtqueue, userspace > > > > > VMM(Qemu) may use a dedicated address space for the control virtqueue > > > > > group to isolate the memory mapping. > > > > > > > > > > The vhost/vhost-vDPA is also extend for the userspace to: > > > > > > > > > > - query the number of virtqueue groups and address spaces supported by > > > > > the device > > > > > - query the virtqueue group for a specific virtqueue > > > > > - assocaite a virtqueue group with an address space > > > > > - send ASID based IOTLB commands > > > > > > > > > > This will help userspace VMM(Qemu) to detect whether the control vq > > > > > could be supported and isolate memory mappings of control virtqueue > > > > > from the others. > > > > > > > > > > To demonstrate the usage, vDPA simulator is extended to support > > > > > setting MAC address via a emulated control virtqueue. > > > > > > > > > > Please review. > > > > > > > > > > Changes since RFC: > > > > > > > > > > - tweak vhost uAPI documentation > > > > > - switch to use device specific IOTLB really in patch 4 > > > > > - tweak the commit log > > > > > - fix that ASID in vhost is claimed to be 32 actually but 16bit > > > > > actually > > > > > - fix use after free when using ASID with IOTLB batching requests > > > > > - switch to use Stefano's patch for having separated iov > > > > > - remove unused "used_as" variable > > > > > - fix the iotlb/asid checking in vhost_vdpa_unmap() > > > > > > > > > > Thanks > > > > > > > > > > Jason Wang (20): > > > > > vhost: move the backend feature bits to vhost_types.h > > > > > virtio-vdpa: don't set callback if virtio doesn't need it > > > > > vhost-vdpa: passing iotlb to IOMMU mapping helpers > > > > > vhost-vdpa: switch to use vhost-vdpa specific IOTLB > > > > > vdpa: add the missing comment for nvqs in struct vdpa_device > > > > > vdpa: introduce virtqueue groups > > > > > vdpa: multiple address spaces support > > > > > vdpa: introduce config operations for associating ASID to a virtqueue > > > > > group > > > > > vhost_iotlb: split out IOTLB initialization > > > > > vhost: support ASID in IOTLB API > > > > > vhost-vdpa: introduce asid based IOTLB > > > > > vhost-vdpa: introduce uAPI to get the number of virtqueue groups > > > > > vhost-vdpa: introduce uAPI to get the number of address spaces > > > > > vhost-vdpa: uAPI to get virtqueue group id > > > > > vhost-vdpa: introduce uAPI to set group ASID > > > > > vhost-vdpa: support ASID based IOTLB API > > > > > vdpa_sim: advertise VIRTIO_NET_F_MTU > > > > > vdpa_sim: factor out buffer completion logic > > > > > vdpa_sim: filter destination mac address > > > > > vdpasim: control virtqueue support > > > > > > > > > > Stefano Garzarella (1): > > > > > vdpa_sim: split vdpasim_virtqueue's iov field in out_iov and in_iov > > > > > > > > > > drivers/vdpa/ifcvf/ifcvf_main.c | 9 +- > > > > > drivers/vdpa/mlx5/net/mlx5_vnet.c | 11 +- > > > > > drivers/vdpa/vdpa.c | 8 +- > > > > > drivers/vdpa/vdpa_sim/vdpa_sim.c | 292 ++++++++++++++++++++++++------ > > > > > drivers/vhost/iotlb.c | 23 ++- > > > > > drivers/vhost/vdpa.c | 246 ++++++++++++++++++++----- > > > > > drivers/vhost/vhost.c | 23 ++- > > > > > drivers/vhost/vhost.h | 4 +- > > > > > drivers/virtio/virtio_vdpa.c | 2 +- > > > > > include/linux/vdpa.h | 42 ++++- > > > > > include/linux/vhost_iotlb.h | 2 + > > > > > include/uapi/linux/vhost.h | 25 ++- > > > > > include/uapi/linux/vhost_types.h | 10 +- > > > > > 13 files changed, 561 insertions(+), 136 deletions(-) > > > > > > > > > > -- > > > > > 2.25.1 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=-8.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 12A50C4361B for ; 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[79.178.32.166]) by smtp.gmail.com with ESMTPSA id d8sm9381263wmb.11.2020.12.17.14.28.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Dec 2020 14:28:44 -0800 (PST) Date: Thu, 17 Dec 2020 17:28:41 -0500 From: "Michael S. Tsirkin" To: Jason Wang Subject: Re: [PATCH 00/21] Control VQ support in vDPA Message-ID: <20201217163513-mutt-send-email-mst@kernel.org> References: <20201216064818.48239-1-jasowang@redhat.com> <20201216044051-mutt-send-email-mst@kernel.org> <20201217025410-mutt-send-email-mst@kernel.org> <61b60985-142b-10f2-58b8-1d9f57c0cfca@redhat.com> MIME-Version: 1.0 In-Reply-To: <61b60985-142b-10f2-58b8-1d9f57c0cfca@redhat.com> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mst@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline Cc: kvm@vger.kernel.org, lulu@redhat.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, eperezma@redhat.com, stefanha@redhat.com, eli@mellanox.com, lingshan.zhu@intel.com, rob.miller@broadcom.com X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization 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