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 10CDBC2D0DB for ; Mon, 20 Jan 2020 12:09:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D48BD20882 for ; Mon, 20 Jan 2020 12:09:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="XJazi4uv" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727066AbgATMJU (ORCPT ); Mon, 20 Jan 2020 07:09:20 -0500 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:51075 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726573AbgATMJU (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=1579522158; 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=XJazi4uvc8FGdXK0hA/jHe7Y8jCenZUr+XMAMOm7NMAJZeomzdavszjWLOjkuS4rsquFSr 68RtAPmdDl1lOAzTOOu4HdaUlVh63Aps3Eyg3bVcGgoLyz6TIZIuAC3AKF9tYZCHqw4gUY Yi/uP6+dDeRNtZ7WY1T4ZP4RG0t2dOs= Received: from mail-qt1-f197.google.com (mail-qt1-f197.google.com [209.85.160.197]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-3-YLqA3ww9M4G7YHgy9rQtiA-1; Mon, 20 Jan 2020 07:09:17 -0500 X-MC-Unique: YLqA3ww9M4G7YHgy9rQtiA-1 Received: by mail-qt1-f197.google.com with SMTP id m8so21000627qta.20 for ; Mon, 20 Jan 2020 04:09:17 -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=CCB2a/s11VLKdlTxEJkIx5B1dAzCo3/fhlppL3xkRUKjHW9XX4PtY2+naK7np44hFI 5J4SwVpOXfC50QD/4jPWhg0GsGKaIajC25t9UL57ukVGgb+gQmg7CrvpBsodnD5nKbvt 1hOm8e49qIB9k3w5wgzzCWF8tTR2NZNeTOI9MLPZSrYhb6vUfYKPwD2r3QY6KiD1n02t YbbDAEeXGAViKY0yB5Pl/nckKuIExIqkzRhRXMfNv5S5aMJHJnEi2Qe2lnGWBcnDSFKg ZAk6vjDCtGhj7vFEr/3/cWbV1pk+REm8ysOG6ViwAT1NdCDZers/1ZvA6/veIhe5KL91 KEzA== X-Gm-Message-State: APjAAAUeWUxMqTxOTziIMrW705TB9t05qOPu5B08/r9IsVBqxYrgSUUG kqzsS2CirwmHIaQq38lNKGPCGhOIufn3K0tDZq7uJgkxUJq7EG9/9knNIynBx2KhkmgM8avIKg6 Nps1j/XeTyQE9NxnhDcOg7woJ X-Received: by 2002:ac8:747:: with SMTP id k7mr20536085qth.120.1579522157148; 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: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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