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=-7.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 9FE24C48BCD for ; Thu, 10 Jun 2021 04:04:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 804A761407 for ; Thu, 10 Jun 2021 04:04:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230023AbhFJEF5 (ORCPT ); Thu, 10 Jun 2021 00:05:57 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:46405 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229778AbhFJEF4 (ORCPT ); Thu, 10 Jun 2021 00:05:56 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1623297840; 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=19S4V0oFIhYTEmjCi3wnOG6CCDqJn4GFX2fH4afLaKA=; b=P7OmA0kTxagkieW5Zt9yOQsoDKq2Z7bhg5HmpZgCxhtJrbAUVNhPnWQW7B191ray7uxKQe beb6aY6du44gIJYFxQhHUZ5vfTCfUqLVD15758itaL+pC7RBkk6w3raxyo8QzX+njunR4c 1z1O/m3kt/hGBCIp37wpyKO1128d2ls= Received: from mail-pg1-f198.google.com (mail-pg1-f198.google.com [209.85.215.198]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-342-vSZknIcUOviRhEESFySbWg-1; Thu, 10 Jun 2021 00:03:58 -0400 X-MC-Unique: vSZknIcUOviRhEESFySbWg-1 Received: by mail-pg1-f198.google.com with SMTP id a26-20020a631a5a0000b02902205085fa58so4389514pgm.16 for ; Wed, 09 Jun 2021 21:03:58 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:from:to:cc:references:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding :content-language; bh=19S4V0oFIhYTEmjCi3wnOG6CCDqJn4GFX2fH4afLaKA=; b=Pzf5nr771/KupNGDsZLgzzyVOxQNAfeDBPeoa+giKIVXesLEw3LmqqEcIpwnpnuZ/z 45PWdwLeuel4R1DYY+uXV/6K9InFNJ/56SnZazzjRxq3JND/s+IeXDUwAVjlYOcNhY3b bP2qcxCkw0KMEcJwkawBz8AqH8ahxKGMCIljJR7XG/6lOMcReu22xhI3tdAldCGoh8L/ NZ216iozjznT+qWj2Lp/u2WOohM3UE8p6tUHIdp6PNUa035I/Wip+AInSIEtLO6F/jHq gWccaOSfnL1W505P8zHTJzqI5Jlf0sSs99mW7dqHzFlJOstTnCdUeRobnQPDvhTPWjrT skVQ== X-Gm-Message-State: AOAM5327lf0BINYmvM/7AueXANDbE/kFQpCxbRCSktndz7XpcGtjE6oN 9wliqQTAmzMzxfgfI5S/q+BB0XnF652CPdLtf/nWl2+o4HLOo9K/HJIy4CGPGGlc2pVcEEdQcVv JJDrJRK32A9bVRCzg223QwItY X-Received: by 2002:a63:3fc6:: with SMTP id m189mr2985876pga.239.1623297837852; Wed, 09 Jun 2021 21:03:57 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwVMH4GRlTNZgCb4SGiAzZbg0vm86YmdxLIXUVjkXzrgfxl13LW9u+XyYW03LglmHfkfEaonA== X-Received: by 2002:a63:3fc6:: with SMTP id m189mr2985870pga.239.1623297837705; Wed, 09 Jun 2021 21:03:57 -0700 (PDT) Received: from wangxiaodeMacBook-Air.local ([209.132.188.80]) by smtp.gmail.com with ESMTPSA id j16sm1136234pgh.69.2021.06.09.21.03.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 09 Jun 2021 21:03:57 -0700 (PDT) Subject: Re: [RFC] /dev/ioasid uAPI proposal From: Jason Wang To: Jason Gunthorpe Cc: "Tian, Kevin" , Lu Baolu , Liu Yi L , "kvm@vger.kernel.org" , Jonathan Corbet , "iommu@lists.linux-foundation.org" , LKML , "Alex Williamson (alex.williamson@redhat.com)\"\"" , David Woodhouse References: <64898584-a482-e6ac-fd71-23549368c508@linux.intel.com> <429d9c2f-3597-eb29-7764-fad3ec9a934f@redhat.com> <05d7f790-870d-5551-1ced-86926a0aa1a6@redhat.com> <42a71462-1abc-0404-156c-60a7ee1ad333@redhat.com> <20210601173138.GM1002214@nvidia.com> <20210602172154.GC1002214@nvidia.com> <20210608132039.GG1002214@nvidia.com> Message-ID: <3af22408-f0f1-7e04-48ab-852619d28ef6@redhat.com> Date: Thu, 10 Jun 2021 12:03:52 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=gbk; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 在 2021/6/10 上午10:00, Jason Wang 写道: > > 在 2021/6/8 下午9:20, Jason Gunthorpe 写道: >> On Tue, Jun 08, 2021 at 09:10:42AM +0800, Jason Wang wrote: >> >>> Well, this sounds like a re-invention of io_uring which has already >>> worked >>> for multifds. >> How so? io_uring is about sending work to the kernel, not getting >> structued events back? > > > Actually it can. Userspace can poll multiple fds via preparing > multiple sqes with IORING_OP_ADD flag. IORING_OP_POLL_ADD actually. Thanks > > >> >> It is more like one of the perf rings > > > This means another ring and we need introduce ioctl() to add or remove > ioasids from the poll. And it still need a kind of fallback like a > list if the ring is full. > > Thanks > > >> >> Jason >> 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=-5.1 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 DF869C47094 for ; Thu, 10 Jun 2021 04:04:04 +0000 (UTC) Received: from smtp3.osuosl.org (smtp3.osuosl.org [140.211.166.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 895DA60232 for ; Thu, 10 Jun 2021 04:04:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 895DA60232 Authentication-Results: mail.kernel.org; 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