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=-8.2 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=unavailable 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 4DE94C4708F for ; Tue, 1 Jun 2021 06:07:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1ED356101C for ; Tue, 1 Jun 2021 06:07:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232905AbhFAGJA (ORCPT ); Tue, 1 Jun 2021 02:09:00 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:41837 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231139AbhFAGI6 (ORCPT ); Tue, 1 Jun 2021 02:08:58 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1622527637; 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=WBtT6QfhiDgonj2vvLPkT9r7vtcFNwuVXyhZCxDQcFk=; b=g3QgaCw5HTnjmQFssW/gZqX/BdxT0PiPrInkzqb5sDFCrlZW/UeDGH6QYMkAJzZSfUbhHC 56mj8tPmO1GnMd1xQ9AIwflyXoIKdg18G7XVDGza8kx41G5M1pjk7cDnA+OMq+o+ccdix9 np7eeJfiaqV8rO/jl/rZd7wDFV8JtuI= Received: from mail-pg1-f200.google.com (mail-pg1-f200.google.com [209.85.215.200]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-11-gX3GaGayO7yGyzcSxsrVaw-1; Tue, 01 Jun 2021 02:07:16 -0400 X-MC-Unique: gX3GaGayO7yGyzcSxsrVaw-1 Received: by mail-pg1-f200.google.com with SMTP id q64-20020a6343430000b02902164088f2f0so8277683pga.5 for ; Mon, 31 May 2021 23:07:16 -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:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding :content-language; bh=WBtT6QfhiDgonj2vvLPkT9r7vtcFNwuVXyhZCxDQcFk=; b=nzAG3RquW5cA49vx57KoCEhy80kpMa8kcvmfbkaX3OEM+XsrxPtvUpjVvhLjqXiDRq f6Da0eHTUrrEw5GR6q0zYzJg8mH4Gw9zVwO4xzFBhShSIYsWOKR/IhIhaDNspqEY8zYi D3gNHY0d/PjF0lOS6evnoU17arJd2jhnt8pt++/jXYONJzvOSAN5VS3urcKWS21HXPln +ugVWo0vr65NNAXBR1ZyDXNrm2kWRCllFkGg1dvfR5RysHFaM35bGNhBEhXHJBs8ciLx hZ8QNRbJBuzRViaS3mhBlgn8LrwQc/SSqjf8oq/FqG8VMTBJjcP8tORfZ+VJxaxkEg56 Zd9g== X-Gm-Message-State: AOAM531s/G3b/+KzakGQufbamLCI6dXkMQxu4PkcfUVkUNYA/TQ6PD+h XQJ4Uqv6scvdfJUQtoWtJtB6KhoIeeI6+wBIl3rBBO5dgbhjzXJGL9G/sgsDZRzmHyKLGsWoKsy 4WNQFiBdfgnJH/1unSkvButXj X-Received: by 2002:a62:1856:0:b029:2e9:c6ef:3b34 with SMTP id 83-20020a6218560000b02902e9c6ef3b34mr10235747pfy.65.1622527635283; Mon, 31 May 2021 23:07:15 -0700 (PDT) X-Google-Smtp-Source: ABdhPJy061Dy19iHLayhC8IX/sic1Xj79JCDr5oreU6IxvFEXjUpr+lVQ790JMBSTMUZPvKcvJ5VZQ== X-Received: by 2002:a62:1856:0:b029:2e9:c6ef:3b34 with SMTP id 83-20020a6218560000b02902e9c6ef3b34mr10235727pfy.65.1622527635026; Mon, 31 May 2021 23:07:15 -0700 (PDT) Received: from wangxiaodeMacBook-Air.local ([209.132.188.80]) by smtp.gmail.com with ESMTPSA id 25sm12058529pfh.39.2021.05.31.23.07.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 31 May 2021 23:07:14 -0700 (PDT) Subject: Re: [RFC] /dev/ioasid uAPI proposal To: "Tian, Kevin" , Lu Baolu , Liu Yi L Cc: "Alex Williamson (alex.williamson@redhat.com)\"\"" , "kvm@vger.kernel.org" , Jonathan Corbet , LKML , "iommu@lists.linux-foundation.org" , Jason Gunthorpe , David Woodhouse References: <20210531164118.265789ee@yiliu-dev> <78ee2638-1a03-fcc8-50a5-81040f677e69@redhat.com> <20210601113152.6d09e47b@yiliu-dev> <164ee532-17b0-e180-81d3-12d49b82ac9f@redhat.com> <64898584-a482-e6ac-fd71-23549368c508@linux.intel.com> <429d9c2f-3597-eb29-7764-fad3ec9a934f@redhat.com> From: Jason Wang Message-ID: <05d7f790-870d-5551-1ced-86926a0aa1a6@redhat.com> Date: Tue, 1 Jun 2021 14:07:05 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.10.2 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 在 2021/6/1 下午1:42, Tian, Kevin 写道: >> From: Jason Wang >> Sent: Tuesday, June 1, 2021 1:30 PM >> >> 在 2021/6/1 下午1:23, Lu Baolu 写道: >>> Hi Jason W, >>> >>> On 6/1/21 1:08 PM, Jason Wang wrote: >>>>>> 2) If yes, what's the reason for not simply use the fd opened from >>>>>> /dev/ioas. (This is the question that is not answered) and what >>>>>> happens >>>>>> if we call GET_INFO for the ioasid_fd? >>>>>> 3) If not, how GET_INFO work? >>>>> oh, missed this question in prior reply. Personally, no special reason >>>>> yet. But using ID may give us opportunity to customize the management >>>>> of the handle. For one, better lookup efficiency by using xarray to >>>>> store the allocated IDs. For two, could categorize the allocated IDs >>>>> (parent or nested). GET_INFO just works with an input FD and an ID. >>>> >>>> I'm not sure I get this, for nesting cases you can still make the >>>> child an fd. >>>> >>>> And a question still, under what case we need to create multiple >>>> ioasids on a single ioasid fd? >>> One possible situation where multiple IOASIDs per FD could be used is >>> that devices with different underlying IOMMU capabilities are sharing a >>> single FD. In this case, only devices with consistent underlying IOMMU >>> capabilities could be put in an IOASID and multiple IOASIDs per FD could >>> be applied. >>> >>> Though, I still not sure about "multiple IOASID per-FD" vs "multiple >>> IOASID FDs" for such case. >> >> Right, that's exactly my question. The latter seems much more easier to >> be understood and implemented. >> > A simple reason discussed in previous thread - there could be 1M's > I/O address spaces per device while #FD's are precious resource. Is the concern for ulimit or performance? Note that we had #define NR_OPEN_MAX ~0U And with the fd semantic, you can do a lot of other stuffs: close on exec, passing via SCM_RIGHTS. For the case of 1M, I would like to know what's the use case for a single process to handle 1M+ address spaces? > So this RFC treats fd as a container of address spaces which is each > tagged by an IOASID. If the container and address space is 1:1 then the container seems useless. Thanks > > Thanks > Kevin 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=-5.7 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,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 377B1C47080 for ; Tue, 1 Jun 2021 06:07:24 +0000 (UTC) Received: from smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (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 C9EAA61263 for ; Tue, 1 Jun 2021 06:07:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C9EAA61263 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; 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Mon, 31 May 2021 23:07:15 -0700 (PDT) X-Google-Smtp-Source: ABdhPJy061Dy19iHLayhC8IX/sic1Xj79JCDr5oreU6IxvFEXjUpr+lVQ790JMBSTMUZPvKcvJ5VZQ== X-Received: by 2002:a62:1856:0:b029:2e9:c6ef:3b34 with SMTP id 83-20020a6218560000b02902e9c6ef3b34mr10235727pfy.65.1622527635026; Mon, 31 May 2021 23:07:15 -0700 (PDT) Received: from wangxiaodeMacBook-Air.local ([209.132.188.80]) by smtp.gmail.com with ESMTPSA id 25sm12058529pfh.39.2021.05.31.23.07.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 31 May 2021 23:07:14 -0700 (PDT) Subject: Re: [RFC] /dev/ioasid uAPI proposal To: "Tian, Kevin" , Lu Baolu , Liu Yi L References: <20210531164118.265789ee@yiliu-dev> <78ee2638-1a03-fcc8-50a5-81040f677e69@redhat.com> <20210601113152.6d09e47b@yiliu-dev> <164ee532-17b0-e180-81d3-12d49b82ac9f@redhat.com> <64898584-a482-e6ac-fd71-23549368c508@linux.intel.com> <429d9c2f-3597-eb29-7764-fad3ec9a934f@redhat.com> From: Jason Wang Message-ID: <05d7f790-870d-5551-1ced-86926a0aa1a6@redhat.com> Date: Tue, 1 Jun 2021 14:07:05 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.10.2 MIME-Version: 1.0 In-Reply-To: Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=jasowang@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Cc: "kvm@vger.kernel.org" , Jonathan Corbet , "iommu@lists.linux-foundation.org" , LKML , "Alex Williamson \(alex.williamson@redhat.com\)\"\"" , Jason Gunthorpe , David Woodhouse X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" CuWcqCAyMDIxLzYvMSDkuIvljYgxOjQyLCBUaWFuLCBLZXZpbiDlhpnpgZM6Cj4+IEZyb206IEph c29uIFdhbmcKPj4gU2VudDogVHVlc2RheSwgSnVuZSAxLCAyMDIxIDE6MzAgUE0KPj4KPj4g5Zyo IDIwMjEvNi8xIOS4i+WNiDE6MjMsIEx1IEJhb2x1IOWGmemBkzoKPj4+IEhpIEphc29uIFcsCj4+ Pgo+Pj4gT24gNi8xLzIxIDE6MDggUE0sIEphc29uIFdhbmcgd3JvdGU6Cj4+Pj4+PiAyKSBJZiB5 ZXMsIHdoYXQncyB0aGUgcmVhc29uIGZvciBub3Qgc2ltcGx5IHVzZSB0aGUgZmQgb3BlbmVkIGZy b20KPj4+Pj4+IC9kZXYvaW9hcy4gKFRoaXMgaXMgdGhlIHF1ZXN0aW9uIHRoYXQgaXMgbm90IGFu c3dlcmVkKSBhbmQgd2hhdAo+Pj4+Pj4gaGFwcGVucwo+Pj4+Pj4gaWYgd2UgY2FsbCBHRVRfSU5G TyBmb3IgdGhlIGlvYXNpZF9mZD8KPj4+Pj4+IDMpIElmIG5vdCwgaG93IEdFVF9JTkZPIHdvcms/ Cj4+Pj4+IG9oLCBtaXNzZWQgdGhpcyBxdWVzdGlvbiBpbiBwcmlvciByZXBseS4gUGVyc29uYWxs eSwgbm8gc3BlY2lhbCByZWFzb24KPj4+Pj4geWV0LiBCdXQgdXNpbmcgSUQgbWF5IGdpdmUgdXMg b3Bwb3J0dW5pdHkgdG8gY3VzdG9taXplIHRoZSBtYW5hZ2VtZW50Cj4+Pj4+IG9mIHRoZSBoYW5k bGUuIEZvciBvbmUsIGJldHRlciBsb29rdXAgZWZmaWNpZW5jeSBieSB1c2luZyB4YXJyYXkgdG8K Pj4+Pj4gc3RvcmUgdGhlIGFsbG9jYXRlZCBJRHMuIEZvciB0d28sIGNvdWxkIGNhdGVnb3JpemUg dGhlIGFsbG9jYXRlZCBJRHMKPj4+Pj4gKHBhcmVudCBvciBuZXN0ZWQpLiBHRVRfSU5GTyBqdXN0 IHdvcmtzIHdpdGggYW4gaW5wdXQgRkQgYW5kIGFuIElELgo+Pj4+Cj4+Pj4gSSdtIG5vdCBzdXJl IEkgZ2V0IHRoaXMsIGZvciBuZXN0aW5nIGNhc2VzIHlvdSBjYW4gc3RpbGwgbWFrZSB0aGUKPj4+ PiBjaGlsZCBhbiBmZC4KPj4+Pgo+Pj4+IEFuZCBhIHF1ZXN0aW9uIHN0aWxsLCB1bmRlciB3aGF0 IGNhc2Ugd2UgbmVlZCB0byBjcmVhdGUgbXVsdGlwbGUKPj4+PiBpb2FzaWRzIG9uIGEgc2luZ2xl IGlvYXNpZCBmZD8KPj4+IE9uZSBwb3NzaWJsZSBzaXR1YXRpb24gd2hlcmUgbXVsdGlwbGUgSU9B U0lEcyBwZXIgRkQgY291bGQgYmUgdXNlZCBpcwo+Pj4gdGhhdCBkZXZpY2VzIHdpdGggZGlmZmVy ZW50IHVuZGVybHlpbmcgSU9NTVUgY2FwYWJpbGl0aWVzIGFyZSBzaGFyaW5nIGEKPj4+IHNpbmds ZSBGRC4gSW4gdGhpcyBjYXNlLCBvbmx5IGRldmljZXMgd2l0aCBjb25zaXN0ZW50IHVuZGVybHlp bmcgSU9NTVUKPj4+IGNhcGFiaWxpdGllcyBjb3VsZCBiZSBwdXQgaW4gYW4gSU9BU0lEIGFuZCBt dWx0aXBsZSBJT0FTSURzIHBlciBGRCBjb3VsZAo+Pj4gYmUgYXBwbGllZC4KPj4+Cj4+PiBUaG91 Z2gsIEkgc3RpbGwgbm90IHN1cmUgYWJvdXQgIm11bHRpcGxlIElPQVNJRCBwZXItRkQiIHZzICJt dWx0aXBsZQo+Pj4gSU9BU0lEIEZEcyIgZm9yIHN1Y2ggY2FzZS4KPj4KPj4gUmlnaHQsIHRoYXQn cyBleGFjdGx5IG15IHF1ZXN0aW9uLiBUaGUgbGF0dGVyIHNlZW1zIG11Y2ggbW9yZSBlYXNpZXIg dG8KPj4gYmUgdW5kZXJzdG9vZCBhbmQgaW1wbGVtZW50ZWQuCj4+Cj4gQSBzaW1wbGUgcmVhc29u IGRpc2N1c3NlZCBpbiBwcmV2aW91cyB0aHJlYWQgLSB0aGVyZSBjb3VsZCBiZSAxTSdzCj4gSS9P IGFkZHJlc3Mgc3BhY2VzIHBlciBkZXZpY2Ugd2hpbGUgI0ZEJ3MgYXJlIHByZWNpb3VzIHJlc291 cmNlLgoKCklzIHRoZSBjb25jZXJuIGZvciB1bGltaXQgb3IgcGVyZm9ybWFuY2U/IE5vdGUgdGhh dCB3ZSBoYWQKCiNkZWZpbmUgTlJfT1BFTl9NQVggfjBVCgpBbmQgd2l0aCB0aGUgZmQgc2VtYW50 aWMsIHlvdSBjYW4gZG8gYSBsb3Qgb2Ygb3RoZXIgc3R1ZmZzOiBjbG9zZSBvbiAKZXhlYywgcGFz c2luZyB2aWEgU0NNX1JJR0hUUy4KCkZvciB0aGUgY2FzZSBvZiAxTSwgSSB3b3VsZCBsaWtlIHRv IGtub3cgd2hhdCdzIHRoZSB1c2UgY2FzZSBmb3IgYSAKc2luZ2xlIHByb2Nlc3MgdG8gaGFuZGxl IDFNKyBhZGRyZXNzIHNwYWNlcz8KCgo+IFNvIHRoaXMgUkZDIHRyZWF0cyBmZCBhcyBhIGNvbnRh aW5lciBvZiBhZGRyZXNzIHNwYWNlcyB3aGljaCBpcyBlYWNoCj4gdGFnZ2VkIGJ5IGFuIElPQVNJ RC4KCgpJZiB0aGUgY29udGFpbmVyIGFuZCBhZGRyZXNzIHNwYWNlIGlzIDE6MSB0aGVuIHRoZSBj b250YWluZXIgc2VlbXMgdXNlbGVzcy4KClRoYW5rcwoKCj4KPiBUaGFua3MKPiBLZXZpbgoKX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KaW9tbXUgbWFpbGlu ZyBsaXN0CmlvbW11QGxpc3RzLmxpbnV4LWZvdW5kYXRpb24ub3JnCmh0dHBzOi8vbGlzdHMubGlu dXhmb3VuZGF0aW9uLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2lvbW11