From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9491B182D1 for ; Thu, 13 Jul 2023 14:52:17 +0000 (UTC) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3BB7C2D46 for ; Thu, 13 Jul 2023 07:52:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1689259927; 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=5E6F9ats4BLmlQpCisZt6wT8CnApvl7BR9/00bgFE+o=; b=LJaL6GD549bXVdn+u3oS8xk3v5iJMb7zUvHcy1iUowkCAFN01Ejp2Q5v1f8KtRSOJQtKgQ O+XdssDYyMXeWN3vNrLIfDcZts8hRs+Z5YC25qN0lwYLBQ9k5cla+Yggl1W5dHZ0+KRopw BD3f5YeEZ/7Pd5/2dc3lXTg5DnQl4kE= Received: from mail-wr1-f70.google.com (mail-wr1-f70.google.com [209.85.221.70]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-632-C0pNkEHXNF-l3u7v3KlIdQ-1; Thu, 13 Jul 2023 10:52:06 -0400 X-MC-Unique: C0pNkEHXNF-l3u7v3KlIdQ-1 Received: by mail-wr1-f70.google.com with SMTP id ffacd0b85a97d-2f2981b8364so467341f8f.1 for ; Thu, 13 Jul 2023 07:52:06 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1689259924; x=1691851924; 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=5E6F9ats4BLmlQpCisZt6wT8CnApvl7BR9/00bgFE+o=; b=cIdMHLB/GCKqnmmUd0v3fy+Z3KvMWkIHqk56asXFBkj1vUx78iiHUnc5SzCFMBrg+P JMvO7rkPgnFK3XPO3R3ZFDuhkObJJ8eJO3vun8gzmD8+11eLtX4BZXLCZp+4BGjXMheE aluz03msYCuE83UAmYKW8liWUAOaDDc7Srp2F4aKJZwS7Wvv2PYWmnyMAQhtarThRV57 iD1UcwnxGsafP9WXTb8lcNCKcGlzGfXKPiSYqXcz2oH1hav70YIMtAvU1FnPGiHC7FjW NkElJorqp6JhHKhyDgxq7dPHQWsmNUpY4LDzeMN//9X3n1ZCiGxPu5EagNjR/B/GVjAW 0+Bg== X-Gm-Message-State: ABy/qLYcPGTvIwrSDuUu0mjWmkREVJxJhnI5qvg0JBlcM1/zE9I6uUek LnrUywZbLEiI3vFxXFQyLMnzenff/a5rGE4HeMKgDvF2RBZNlb1Vd77HQNSx02/grhn9o+YCl8S dvmbU5VKeCboaHFadzXfQUX2p X-Received: by 2002:a5d:4e8d:0:b0:314:ca7:f30b with SMTP id e13-20020a5d4e8d000000b003140ca7f30bmr1958302wru.54.1689259924769; Thu, 13 Jul 2023 07:52:04 -0700 (PDT) X-Google-Smtp-Source: APBJJlFRuSHTNPf9qN+kahsoUR/nmIalfm3YfEdwlFil6U+7gTdTpuIDAdjWTT/+bCM2yDuYWb+3kQ== X-Received: by 2002:a5d:4e8d:0:b0:314:ca7:f30b with SMTP id e13-20020a5d4e8d000000b003140ca7f30bmr1958277wru.54.1689259924514; Thu, 13 Jul 2023 07:52:04 -0700 (PDT) Received: from redhat.com ([2.52.158.233]) by smtp.gmail.com with ESMTPSA id s15-20020adff80f000000b00313f9a0c521sm8253520wrp.107.2023.07.13.07.52.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Jul 2023 07:52:04 -0700 (PDT) Date: Thu, 13 Jul 2023 10:51:59 -0400 From: "Michael S. Tsirkin" To: Christoph Hellwig Cc: Xuan Zhuo , virtualization@lists.linux-foundation.org, Jason Wang , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , netdev@vger.kernel.org, bpf@vger.kernel.org Subject: Re: [PATCH vhost v11 05/10] virtio_ring: introduce virtqueue_dma_dev() Message-ID: <20230713104805-mutt-send-email-mst@kernel.org> References: <20230710034237.12391-1-xuanzhuo@linux.alibaba.com> <20230710034237.12391-6-xuanzhuo@linux.alibaba.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H4,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net On Thu, Jul 13, 2023 at 04:15:16AM -0700, Christoph Hellwig wrote: > On Mon, Jul 10, 2023 at 11:42:32AM +0800, Xuan Zhuo wrote: > > Added virtqueue_dma_dev() to get DMA device for virtio. Then the > > caller can do dma operation in advance. The purpose is to keep memory > > mapped across multiple add/get buf operations. > > This is just poking holes into the abstraction.. More specifically? -- MST