Received: by 2002:ac0:a5b6:0:0:0:0:0 with SMTP id m51-v6csp3567903imm; Mon, 4 Jun 2018 05:56:27 -0700 (PDT) X-Google-Smtp-Source: ADUXVKK0JMlZca+Bu2vlobnRoa1JOyRfhw0IXx8Tyb8mNggCbM5Cf/La9CbJ+FSgz1NVmG2drVN5 X-Received: by 2002:a65:6119:: with SMTP id z25-v6mr17256609pgu.139.1528116987876; Mon, 04 Jun 2018 05:56:27 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1528116987; cv=none; d=google.com; s=arc-20160816; b=JWvia8u3NHPMlQo9rAa+yJFNcZrgZIqf2EnO+eCH90B2BAfuxr6VzLbRwpJTpL11pO h60vRwI+r+vbF+YSjpgln289ksPV6VWlMVb4AzhNnbB6NMYgYu95x/AOAy0Cl8IaE23M N9PNw1jGOFG+hQy0bDvcc0gL+qSxDUZamLdqU7tzZw61Rg1bkuYB+bGs3ImJo+6bjDwD xoxXobq60t2nYaJq6rbFQXt4MlC6jkeaFm0cWHt323zZF+a2rS/O1LWDI5H5GrtABcVG Q/ameFz9OtDzi9W5wk807i1/6nb6jBYf2S1kJOgrwpu035YAyxMQb5LFBBvA04ikW27B 5UGA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-disposition:mime-version:references:message-id:subject:cc :to:from:date:dkim-signature:arc-authentication-results; bh=upweunkGAkap5DjS/MkCFpVQqfhWCwk9Ap6tf9GBkx8=; b=zpc7YR/7LFL6BE0u5tjO1Sz8ES77lffNWTfS4jC6NzIMbqRcoA2uf/XbzMSxUq6JJv 3uF+1kn7SFc8QpQQhGErY+0Q81u8+D40mO6v98zB1FdDqINgBAzOfiwBtNnEpCpX6b3i W1LTctB27AsnKB9ntnAgi4YaPw9Iphe1hbjn1+TBv88nWh7aBkjteZ+l2uVbFrWchsPm 7lPO1hmGmbF40P0AhsrUzlvlAGc56qKzpvnt/QsTouXbEQOYBkGABuINlLF2DzlLiMCq hinpOiRKpaP4S0LxpaSo1SlC0N25eMVhO4R6v55+/HYrHPvUhsnndVbwpdgvePkzU2EM b9Ag== ARC-Authentication-Results: i=1; mx.google.com; dkim=fail header.i=@infradead.org header.s=bombadil.20170209 header.b=iyu9K+bo; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id o1-v6si36837615pgp.273.2018.06.04.05.56.13; Mon, 04 Jun 2018 05:56:27 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=fail header.i=@infradead.org header.s=bombadil.20170209 header.b=iyu9K+bo; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753152AbeFDMzh (ORCPT + 99 others); Mon, 4 Jun 2018 08:55:37 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:35332 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752946AbeFDMzg (ORCPT ); Mon, 4 Jun 2018 08:55:36 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=upweunkGAkap5DjS/MkCFpVQqfhWCwk9Ap6tf9GBkx8=; b=iyu9K+bomxWi6X6DAPwrYXFs7 0j+Irn21LQ9jLQe/17LpMHO5G/GMaiQaz/5JPyn5EmMXuW8DErZUhjXSn9NedGDYmzsppBYiXiD3j q4MFbbLnlFqBMF4+uC8wgXLo7tpGhDPPmbxOiEjEkIriSbczBdiWZ/CH3a9Kx3ddt7y6+RIifjE1M C4uOdwiink6Qiz7V4i+qs+sCMxZ+oU9Vv464YhwCm5GEIJYtAlRCPLQNCsDtESA3Aut8k02xHQ7mh ++2nJk+cOoDeVSvW1A9UvPiosrj8tkgK/IjJIgX/DNG0P5aKnaVVr/IaYLDzeSYOdepLRq6BjCLkx lUZfEu7OA==; Received: from hch by bombadil.infradead.org with local (Exim 4.90_1 #2 (Red Hat Linux)) id 1fPp1G-0005fi-RU; Mon, 04 Jun 2018 12:55:30 +0000 Date: Mon, 4 Jun 2018 05:55:30 -0700 From: Christoph Hellwig To: "Michael S. Tsirkin" Cc: Benjamin Herrenschmidt , Anshuman Khandual , virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, aik@ozlabs.ru, robh@kernel.org, joe@perches.com, elfring@users.sourceforge.net, david@gibson.dropbear.id.au, jasowang@redhat.com, mpe@ellerman.id.au, hch@infradead.org Subject: Re: [RFC V2] virtio: Add platform specific DMA API translation for virito devices Message-ID: <20180604125530.GA16378@infradead.org> References: <20180522063317.20956-1-khandual@linux.vnet.ibm.com> <20180523213703-mutt-send-email-mst@kernel.org> <20180604153558-mutt-send-email-mst@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180604153558-mutt-send-email-mst@kernel.org> User-Agent: Mutt/1.9.2 (2017-12-15) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jun 04, 2018 at 03:43:09PM +0300, Michael S. Tsirkin wrote: > Another is that given the basic functionality is in there, optimizations > can possibly wait until per-device quirks in DMA API are supported. We have had per-device dma_ops for quite a while.