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=-0.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no 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 9BB02C2D0DB for ; Mon, 20 Jan 2020 12:09:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7135020882 for ; Mon, 20 Jan 2020 12:09:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="GCe3QNDJ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726890AbgATMJU (ORCPT ); Mon, 20 Jan 2020 07:09:20 -0500 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:53041 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726650AbgATMJU (ORCPT ); Mon, 20 Jan 2020 07:09:20 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1579522159; 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=ils+V+DNAQCUc++KUaM/zwaIHOd66hKtcZoyoJKDxck=; b=GCe3QNDJRURITeOgI1NabtNtvMz8orHIofX34AArN+lgV3sWaxgxt4DTnAGyrPh1aADYjn aawpz8iNZ07iMoXGnsXdxVu35gmunh540+gt1ivhRoo22UplJHXZeu7IW0I8TeBFMZlHjo WgSfsE2wUSPtq5/aaveLvPZg/oHbkfQ= Received: from mail-qk1-f198.google.com (mail-qk1-f198.google.com [209.85.222.198]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-414-PFJD11nJPhect7L26oyk6Q-1; Mon, 20 Jan 2020 07:09:18 -0500 X-MC-Unique: PFJD11nJPhect7L26oyk6Q-1 Received: by mail-qk1-f198.google.com with SMTP id i135so20264011qke.14 for ; Mon, 20 Jan 2020 04:09:18 -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=ils+V+DNAQCUc++KUaM/zwaIHOd66hKtcZoyoJKDxck=; b=FsZTMaxmGljX/2bFfhc6zDldPC3lUJ60YxUSVOOwJsRPZuzH4DPx1QUVX69rfvXcv4 gq3Cvq/Xp2tEztxlwFQjcRUkOnJA0nCcQtISPfi2GDA6x3mSshK1+BPzfPB3FYHCrxXs 1W/Nv4IRjdS9jNa69ajmAbQcYI6XnPyLqPweRc/ld/qfe8MtVMjzC/gL/qbEgFWVxEJE SVUDROesWHmn1CfuogJG1oFzw1pb6lde2fE1VKpuAN611B+b89iKmT7/9TMDqC1u0l2P KJvPVy/p9jTeyFQmo7uIHnsi4oS4OGK8rn3gcX0GWSI9prMe1MHn+z03ALJsuALzVEHy kW2Q== X-Gm-Message-State: APjAAAWI3rAUzytX5zxbt2t3yq/C7abZYJhGanNWSPKNEyukD0G0DVfT dfL7f7nGAGNmD/geGoRp/QY4zCgthnsmXnQkMBDFmYTdsKgbKvRk3w+JzH0ijGSLeYH2R2Zck++ Zow/lDQstwxLQ X-Received: by 2002:ac8:747:: with SMTP id k7mr20536097qth.120.1579522157153; Mon, 20 Jan 2020 04:09:17 -0800 (PST) X-Google-Smtp-Source: APXvYqyPRlGSUNQNiKSICSXdcPuLibX0Cl/JMb+oCpOV4CRtRfGtUmRXGfQQVE1MHMBhude5c31BGg== X-Received: by 2002:ac8:747:: with SMTP id k7mr20536064qth.120.1579522156954; Mon, 20 Jan 2020 04:09:16 -0800 (PST) Received: from redhat.com (bzq-79-179-85-180.red.bezeqint.net. [79.179.85.180]) by smtp.gmail.com with ESMTPSA id t2sm15467285qkc.31.2020.01.20.04.09.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Jan 2020 04:09:15 -0800 (PST) Date: Mon, 20 Jan 2020 07:09:07 -0500 From: "Michael S. Tsirkin" To: Jason Wang Cc: Shahaf Shuler , Rob Miller , "linux-kernel@vger.kernel.org" , "kvm@vger.kernel.org" , "virtualization@lists.linux-foundation.org" , Netdev , "Bie, Tiwei" , Jason Gunthorpe , "maxime.coquelin@redhat.com" , "Liang, Cunming" , "Wang, Zhihong" , "Wang, Xiao W" , "haotian.wang@sifive.com" , "Zhu, Lingshan" , "eperezma@redhat.com" , "lulu@redhat.com" , Parav Pandit , "Tian, Kevin" , "stefanha@redhat.com" , "rdunlap@infradead.org" , "hch@infradead.org" , Ariel Adam , "jakub.kicinski@netronome.com" , Jiri Pirko , "hanand@xilinx.com" , "mhabets@solarflare.com" Subject: Re: [PATCH 3/5] vDPA: introduce vDPA bus Message-ID: <20200120070710-mutt-send-email-mst@kernel.org> References: <20200116124231.20253-1-jasowang@redhat.com> <20200116124231.20253-4-jasowang@redhat.com> <20200117070324-mutt-send-email-mst@kernel.org> <239b042c-2d9e-0eec-a1ef-b03b7e2c5419@redhat.com> <20200119045849-mutt-send-email-mst@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Mon, Jan 20, 2020 at 04:44:34PM +0800, Jason Wang wrote: > > On 2020/1/19 下午5:59, Michael S. Tsirkin wrote: > > On Sun, Jan 19, 2020 at 09:07:09AM +0000, Shahaf Shuler wrote: > > > > Technically, we can keep the incremental API > > > > here and let the vendor vDPA drivers to record the full mapping > > > > internally which may slightly increase the complexity of vendor driver. > > > What will be the trigger for the driver to know it received the last mapping on this series and it can now push it to the on-chip IOMMU? > > Some kind of invalidate API? > > > > The problem is how to deal with the case of vIOMMU. When vIOMMU is enabling > there's no concept of last mapping. > > Thanks Most IOMMUs have a translation cache so have an invalidate API too. -- MST