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=-2.4 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,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 28E7BC17441 for ; Tue, 12 Nov 2019 23:17:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 00B1821872 for ; Tue, 12 Nov 2019 23:17:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="p3qYKNzV" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726983AbfKLXRc (ORCPT ); Tue, 12 Nov 2019 18:17:32 -0500 Received: from hqemgate16.nvidia.com ([216.228.121.65]:8581 "EHLO hqemgate16.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726910AbfKLXRb (ORCPT ); Tue, 12 Nov 2019 18:17:31 -0500 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate16.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Tue, 12 Nov 2019 15:16:27 -0800 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Tue, 12 Nov 2019 15:17:23 -0800 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Tue, 12 Nov 2019 15:17:23 -0800 Received: from [10.110.48.28] (10.124.1.5) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 12 Nov 2019 23:17:22 +0000 Subject: Re: [PATCH v3 08/23] vfio, mm: fix get_user_pages_remote() and FOLL_LONGTERM To: Dan Williams CC: Jason Gunthorpe , Andrew Morton , Al Viro , Alex Williamson , Benjamin Herrenschmidt , =?UTF-8?B?QmrDtnJuIFTDtnBlbA==?= , Christoph Hellwig , Daniel Vetter , Dave Chinner , David Airlie , "David S . Miller" , Ira Weiny , Jan Kara , Jens Axboe , Jonathan Corbet , =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= , Magnus Karlsson , Mauro Carvalho Chehab , Michael Ellerman , Michal Hocko , Mike Kravetz , Paul Mackerras , Shuah Khan , Vlastimil Babka , , Maling list - DRI developers , KVM list , , Linux Doc Mailing List , linux-fsdevel , , "Linux-media@vger.kernel.org" , linux-rdma , linuxppc-dev , Netdev , Linux MM , LKML References: <20191112000700.3455038-1-jhubbard@nvidia.com> <20191112000700.3455038-9-jhubbard@nvidia.com> <20191112204338.GE5584@ziepe.ca> <0db36e86-b779-01af-77e7-469af2a2e19c@nvidia.com> From: John Hubbard X-Nvconfidentiality: public Message-ID: <85987617-9f6b-6bd3-fea2-9f2910d942bd@nvidia.com> Date: Tue, 12 Nov 2019 15:17:22 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: X-Originating-IP: [10.124.1.5] X-ClientProxiedBy: HQMAIL111.nvidia.com (172.20.187.18) To HQMAIL107.nvidia.com (172.20.187.13) Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1573600587; bh=MjC1bPxvrMSKZyR0vfIkph3DH21vc9F8lPoYeam7DCg=; h=X-PGP-Universal:Subject:To:CC:References:From:X-Nvconfidentiality: Message-ID:Date:User-Agent:MIME-Version:In-Reply-To: X-Originating-IP:X-ClientProxiedBy:Content-Type:Content-Language: Content-Transfer-Encoding; b=p3qYKNzVf+yoWXVxXvdWjvLLch3+eBgZBZPzM5iL19+w8RiUo7ZDiZ6gW1HFxWncA +kkprqimeUO8SSqHdah/r3BwJo4tDay3qaFNXlfKQCKgL2mn5vpeQtNa9DXVDSKAs9 R4vcNKCywQ8SHP3DUh8n5njcCPN6pw3P07lAmh8mqH74Fvgl1XHO+C/rjd/05WqSfr CbI8v19uMzgduDq6l5KCW1YAmvvVqDA87KUBJVym8vf0Kv0kKAaenl3Op2+6yladeP PH6kHbkLvI9QcVfTqnjU+9eG71rPYcWHuFxhGzrL4Y4JAkS0eHU4rmGDiCKR0r+10R ZzG6cdcgSU6Ww== Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On 11/12/19 2:45 PM, Dan Williams wrote: > On Tue, Nov 12, 2019 at 2:43 PM John Hubbard wrote: >> >> On 11/12/19 12:43 PM, Jason Gunthorpe wrote: >> ... >>>> - } >>>> + ret = get_user_pages_remote(NULL, mm, vaddr, 1, flags | FOLL_LONGTERM, >>>> + page, vmas, NULL); >>>> + /* >>>> + * The lifetime of a vaddr_get_pfn() page pin is >>>> + * userspace-controlled. In the fs-dax case this could >>>> + * lead to indefinite stalls in filesystem operations. >>>> + * Disallow attempts to pin fs-dax pages via this >>>> + * interface. >>>> + */ >>>> + if (ret > 0 && vma_is_fsdax(vmas[0])) { >>>> + ret = -EOPNOTSUPP; >>>> + put_page(page[0]); >>>> } >>> >>> AFAIK this chunk is redundant now as it is some hack to emulate >>> FOLL_LONGTERM? So vmas can be deleted too. >> >> Let me first make sure I understand what Dan has in mind for the vma >> checking, in the other thread... > > It's not redundant relative to upstream which does not do anything the > FOLL_LONGTERM in the gup-slow path... but I have not looked at patches > 1-7 to see if something there made it redundant. > There is nothing in patches 1-7 that would make it redundant. About the only thing that you might find interesting in that subset is patch 4 ("mm: devmap: refactor 1-based refcounting for ZONE_DEVICE pages"), for devmap and ZONE_DEVICE interest. But it doesn't affect this discussion directly. thanks, -- John Hubbard NVIDIA 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=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,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 9860CC43331 for ; Tue, 12 Nov 2019 23:20:31 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (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 4609821872 for ; Tue, 12 Nov 2019 23:20:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="p3qYKNzV" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4609821872 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=nvidia.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 47CNyP0YvtzF5gJ for ; Wed, 13 Nov 2019 10:20:29 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nvidia.com (client-ip=216.228.121.65; helo=hqemgate16.nvidia.com; envelope-from=jhubbard@nvidia.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=nvidia.com Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=nvidia.com header.i=@nvidia.com header.b="p3qYKNzV"; dkim-atps=neutral Received: from hqemgate16.nvidia.com (hqemgate16.nvidia.com [216.228.121.65]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 47CNtw1zvZzF5sY for ; Wed, 13 Nov 2019 10:17:27 +1100 (AEDT) Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate16.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Tue, 12 Nov 2019 15:16:27 -0800 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Tue, 12 Nov 2019 15:17:23 -0800 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Tue, 12 Nov 2019 15:17:23 -0800 Received: from [10.110.48.28] (10.124.1.5) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 12 Nov 2019 23:17:22 +0000 Subject: Re: [PATCH v3 08/23] vfio, mm: fix get_user_pages_remote() and FOLL_LONGTERM To: Dan Williams References: <20191112000700.3455038-1-jhubbard@nvidia.com> <20191112000700.3455038-9-jhubbard@nvidia.com> <20191112204338.GE5584@ziepe.ca> <0db36e86-b779-01af-77e7-469af2a2e19c@nvidia.com> From: John Hubbard X-Nvconfidentiality: public Message-ID: <85987617-9f6b-6bd3-fea2-9f2910d942bd@nvidia.com> Date: Tue, 12 Nov 2019 15:17:22 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: X-Originating-IP: [10.124.1.5] X-ClientProxiedBy: HQMAIL111.nvidia.com (172.20.187.18) To HQMAIL107.nvidia.com (172.20.187.13) Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1573600587; bh=MjC1bPxvrMSKZyR0vfIkph3DH21vc9F8lPoYeam7DCg=; h=X-PGP-Universal:Subject:To:CC:References:From:X-Nvconfidentiality: Message-ID:Date:User-Agent:MIME-Version:In-Reply-To: X-Originating-IP:X-ClientProxiedBy:Content-Type:Content-Language: Content-Transfer-Encoding; b=p3qYKNzVf+yoWXVxXvdWjvLLch3+eBgZBZPzM5iL19+w8RiUo7ZDiZ6gW1HFxWncA +kkprqimeUO8SSqHdah/r3BwJo4tDay3qaFNXlfKQCKgL2mn5vpeQtNa9DXVDSKAs9 R4vcNKCywQ8SHP3DUh8n5njcCPN6pw3P07lAmh8mqH74Fvgl1XHO+C/rjd/05WqSfr CbI8v19uMzgduDq6l5KCW1YAmvvVqDA87KUBJVym8vf0Kv0kKAaenl3Op2+6yladeP PH6kHbkLvI9QcVfTqnjU+9eG71rPYcWHuFxhGzrL4Y4JAkS0eHU4rmGDiCKR0r+10R ZzG6cdcgSU6Ww== X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Michal Hocko , Jan Kara , KVM list , Linux Doc Mailing List , David Airlie , Dave Chinner , Maling list - DRI developers , LKML , Linux MM , Paul Mackerras , linux-kselftest@vger.kernel.org, Ira Weiny , Jonathan Corbet , linux-rdma , Christoph Hellwig , Jason Gunthorpe , Vlastimil Babka , =?UTF-8?B?QmrDtnJuIFTDtnBlbA==?= , "Linux-media@vger.kernel.org" , Shuah Khan , linux-block@vger.kernel.org, =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= , Al Viro , Mauro Carvalho Chehab , bpf@vger.kernel.org, Magnus Karlsson , Jens Axboe , Netdev , Alex Williamson , Daniel Vetter , linux-fsdevel , Andrew Morton , linuxppc-dev , "David S . Miller" , Mike Kravetz Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 11/12/19 2:45 PM, Dan Williams wrote: > On Tue, Nov 12, 2019 at 2:43 PM John Hubbard wrote: >> >> On 11/12/19 12:43 PM, Jason Gunthorpe wrote: >> ... >>>> - } >>>> + ret = get_user_pages_remote(NULL, mm, vaddr, 1, flags | FOLL_LONGTERM, >>>> + page, vmas, NULL); >>>> + /* >>>> + * The lifetime of a vaddr_get_pfn() page pin is >>>> + * userspace-controlled. In the fs-dax case this could >>>> + * lead to indefinite stalls in filesystem operations. >>>> + * Disallow attempts to pin fs-dax pages via this >>>> + * interface. >>>> + */ >>>> + if (ret > 0 && vma_is_fsdax(vmas[0])) { >>>> + ret = -EOPNOTSUPP; >>>> + put_page(page[0]); >>>> } >>> >>> AFAIK this chunk is redundant now as it is some hack to emulate >>> FOLL_LONGTERM? So vmas can be deleted too. >> >> Let me first make sure I understand what Dan has in mind for the vma >> checking, in the other thread... > > It's not redundant relative to upstream which does not do anything the > FOLL_LONGTERM in the gup-slow path... but I have not looked at patches > 1-7 to see if something there made it redundant. > There is nothing in patches 1-7 that would make it redundant. About the only thing that you might find interesting in that subset is patch 4 ("mm: devmap: refactor 1-based refcounting for ZONE_DEVICE pages"), for devmap and ZONE_DEVICE interest. But it doesn't affect this discussion directly. thanks, -- John Hubbard NVIDIA From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Hubbard Subject: Re: [PATCH v3 08/23] vfio, mm: fix get_user_pages_remote() and FOLL_LONGTERM Date: Tue, 12 Nov 2019 15:17:22 -0800 Message-ID: <85987617-9f6b-6bd3-fea2-9f2910d942bd@nvidia.com> References: <20191112000700.3455038-1-jhubbard@nvidia.com> <20191112000700.3455038-9-jhubbard@nvidia.com> <20191112204338.GE5584@ziepe.ca> <0db36e86-b779-01af-77e7-469af2a2e19c@nvidia.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from hqemgate16.nvidia.com (hqemgate16.nvidia.com [216.228.121.65]) by gabe.freedesktop.org (Postfix) with ESMTPS id B6BAB6EC27 for ; Tue, 12 Nov 2019 23:17:23 +0000 (UTC) In-Reply-To: Content-Language: en-US List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: Dan Williams Cc: Michal Hocko , Jan Kara , KVM list , Linux Doc Mailing List , David Airlie , Dave Chinner , Maling list - DRI developers , LKML , Linux MM , Paul Mackerras , linux-kselftest@vger.kernel.org, Ira Weiny , Jonathan Corbet , linux-rdma , Michael Ellerman , Christoph Hellwig , Jason Gunthorpe , Vlastimil Babka , =?UTF-8?B?QmrDtnJuIFTDtnBlbA==?= , "Linux-media@vger.kernel.org" , Shuah Khan , linux-block@vger.kernel.org, =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= List-Id: dri-devel@lists.freedesktop.org T24gMTEvMTIvMTkgMjo0NSBQTSwgRGFuIFdpbGxpYW1zIHdyb3RlOgo+IE9uIFR1ZSwgTm92IDEy LCAyMDE5IGF0IDI6NDMgUE0gSm9obiBIdWJiYXJkIDxqaHViYmFyZEBudmlkaWEuY29tPiB3cm90 ZToKPj4KPj4gT24gMTEvMTIvMTkgMTI6NDMgUE0sIEphc29uIEd1bnRob3JwZSB3cm90ZToKPj4g Li4uCj4+Pj4gLSAgICAgICAgICAgIH0KPj4+PiArICAgIHJldCA9IGdldF91c2VyX3BhZ2VzX3Jl bW90ZShOVUxMLCBtbSwgdmFkZHIsIDEsIGZsYWdzIHwgRk9MTF9MT05HVEVSTSwKPj4+PiArICAg ICAgICAgICAgICAgICAgICAgICAgICAgICAgICBwYWdlLCB2bWFzLCBOVUxMKTsKPj4+PiArICAg IC8qCj4+Pj4gKyAgICAgKiBUaGUgbGlmZXRpbWUgb2YgYSB2YWRkcl9nZXRfcGZuKCkgcGFnZSBw aW4gaXMKPj4+PiArICAgICAqIHVzZXJzcGFjZS1jb250cm9sbGVkLiBJbiB0aGUgZnMtZGF4IGNh c2UgdGhpcyBjb3VsZAo+Pj4+ICsgICAgICogbGVhZCB0byBpbmRlZmluaXRlIHN0YWxscyBpbiBm aWxlc3lzdGVtIG9wZXJhdGlvbnMuCj4+Pj4gKyAgICAgKiBEaXNhbGxvdyBhdHRlbXB0cyB0byBw aW4gZnMtZGF4IHBhZ2VzIHZpYSB0aGlzCj4+Pj4gKyAgICAgKiBpbnRlcmZhY2UuCj4+Pj4gKyAg ICAgKi8KPj4+PiArICAgIGlmIChyZXQgPiAwICYmIHZtYV9pc19mc2RheCh2bWFzWzBdKSkgewo+ Pj4+ICsgICAgICAgICAgICByZXQgPSAtRU9QTk9UU1VQUDsKPj4+PiArICAgICAgICAgICAgcHV0 X3BhZ2UocGFnZVswXSk7Cj4+Pj4gICAgICB9Cj4+Pgo+Pj4gQUZBSUsgdGhpcyBjaHVuayBpcyBy ZWR1bmRhbnQgbm93IGFzIGl0IGlzIHNvbWUgaGFjayB0byBlbXVsYXRlCj4+PiBGT0xMX0xPTkdU RVJNPyBTbyB2bWFzIGNhbiBiZSBkZWxldGVkIHRvby4KPj4KPj4gTGV0IG1lIGZpcnN0IG1ha2Ug c3VyZSBJIHVuZGVyc3RhbmQgd2hhdCBEYW4gaGFzIGluIG1pbmQgZm9yIHRoZSB2bWEKPj4gY2hl Y2tpbmcsIGluIHRoZSBvdGhlciB0aHJlYWQuLi4KPiAKPiBJdCdzIG5vdCByZWR1bmRhbnQgcmVs YXRpdmUgdG8gdXBzdHJlYW0gd2hpY2ggZG9lcyBub3QgZG8gYW55dGhpbmcgdGhlCj4gRk9MTF9M T05HVEVSTSBpbiB0aGUgZ3VwLXNsb3cgcGF0aC4uLiBidXQgSSBoYXZlIG5vdCBsb29rZWQgYXQg cGF0Y2hlcwo+IDEtNyB0byBzZWUgaWYgc29tZXRoaW5nIHRoZXJlIG1hZGUgaXQgcmVkdW5kYW50 Lgo+IAoKVGhlcmUgaXMgbm90aGluZyBpbiBwYXRjaGVzIDEtNyB0aGF0IHdvdWxkIG1ha2UgaXQg cmVkdW5kYW50LiAKCkFib3V0IHRoZSBvbmx5IHRoaW5nIHRoYXQgeW91IG1pZ2h0IGZpbmQgaW50 ZXJlc3RpbmcgaW4gdGhhdCBzdWJzZXQgaXMKcGF0Y2ggNCAoIm1tOiBkZXZtYXA6IHJlZmFjdG9y IDEtYmFzZWQgcmVmY291bnRpbmcgZm9yIFpPTkVfREVWSUNFIHBhZ2VzIiksCmZvciBkZXZtYXAg YW5kIFpPTkVfREVWSUNFIGludGVyZXN0LiBCdXQgaXQgZG9lc24ndCBhZmZlY3QgdGhpcwpkaXNj dXNzaW9uIGRpcmVjdGx5LgoKCnRoYW5rcywKLS0gCkpvaG4gSHViYmFyZApOVklESUEKX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KZHJpLWRldmVsIG1haWxp bmcgbGlzdApkcmktZGV2ZWxAbGlzdHMuZnJlZWRlc2t0b3Aub3JnCmh0dHBzOi8vbGlzdHMuZnJl ZWRlc2t0b3Aub3JnL21haWxtYW4vbGlzdGluZm8vZHJpLWRldmVs 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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,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 256D8C43331 for ; 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Tue, 12 Nov 2019 15:16:27 -0800 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Tue, 12 Nov 2019 15:17:23 -0800 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Tue, 12 Nov 2019 15:17:23 -0800 Received: from [10.110.48.28] (10.124.1.5) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 12 Nov 2019 23:17:22 +0000 Subject: Re: [PATCH v3 08/23] vfio, mm: fix get_user_pages_remote() and FOLL_LONGTERM To: Dan Williams References: <20191112000700.3455038-1-jhubbard@nvidia.com> <20191112000700.3455038-9-jhubbard@nvidia.com> <20191112204338.GE5584@ziepe.ca> <0db36e86-b779-01af-77e7-469af2a2e19c@nvidia.com> From: John Hubbard X-Nvconfidentiality: public Message-ID: <85987617-9f6b-6bd3-fea2-9f2910d942bd@nvidia.com> Date: Tue, 12 Nov 2019 15:17:22 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: X-Originating-IP: [10.124.1.5] X-ClientProxiedBy: HQMAIL111.nvidia.com (172.20.187.18) To HQMAIL107.nvidia.com (172.20.187.13) Content-Language: en-US X-Mailman-Original-DKIM-Signature: v=1; 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Miller" , Mike Kravetz Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Message-ID: <20191112231722.l3ekF6s79LGmFzsqFl5aBZykEoF0DPqQ8bBRsGmPzOI@z> T24gMTEvMTIvMTkgMjo0NSBQTSwgRGFuIFdpbGxpYW1zIHdyb3RlOgo+IE9uIFR1ZSwgTm92IDEy LCAyMDE5IGF0IDI6NDMgUE0gSm9obiBIdWJiYXJkIDxqaHViYmFyZEBudmlkaWEuY29tPiB3cm90 ZToKPj4KPj4gT24gMTEvMTIvMTkgMTI6NDMgUE0sIEphc29uIEd1bnRob3JwZSB3cm90ZToKPj4g Li4uCj4+Pj4gLSAgICAgICAgICAgIH0KPj4+PiArICAgIHJldCA9IGdldF91c2VyX3BhZ2VzX3Jl bW90ZShOVUxMLCBtbSwgdmFkZHIsIDEsIGZsYWdzIHwgRk9MTF9MT05HVEVSTSwKPj4+PiArICAg ICAgICAgICAgICAgICAgICAgICAgICAgICAgICBwYWdlLCB2bWFzLCBOVUxMKTsKPj4+PiArICAg IC8qCj4+Pj4gKyAgICAgKiBUaGUgbGlmZXRpbWUgb2YgYSB2YWRkcl9nZXRfcGZuKCkgcGFnZSBw aW4gaXMKPj4+PiArICAgICAqIHVzZXJzcGFjZS1jb250cm9sbGVkLiBJbiB0aGUgZnMtZGF4IGNh c2UgdGhpcyBjb3VsZAo+Pj4+ICsgICAgICogbGVhZCB0byBpbmRlZmluaXRlIHN0YWxscyBpbiBm aWxlc3lzdGVtIG9wZXJhdGlvbnMuCj4+Pj4gKyAgICAgKiBEaXNhbGxvdyBhdHRlbXB0cyB0byBw aW4gZnMtZGF4IHBhZ2VzIHZpYSB0aGlzCj4+Pj4gKyAgICAgKiBpbnRlcmZhY2UuCj4+Pj4gKyAg ICAgKi8KPj4+PiArICAgIGlmIChyZXQgPiAwICYmIHZtYV9pc19mc2RheCh2bWFzWzBdKSkgewo+ Pj4+ICsgICAgICAgICAgICByZXQgPSAtRU9QTk9UU1VQUDsKPj4+PiArICAgICAgICAgICAgcHV0 X3BhZ2UocGFnZVswXSk7Cj4+Pj4gICAgICB9Cj4+Pgo+Pj4gQUZBSUsgdGhpcyBjaHVuayBpcyBy ZWR1bmRhbnQgbm93IGFzIGl0IGlzIHNvbWUgaGFjayB0byBlbXVsYXRlCj4+PiBGT0xMX0xPTkdU RVJNPyBTbyB2bWFzIGNhbiBiZSBkZWxldGVkIHRvby4KPj4KPj4gTGV0IG1lIGZpcnN0IG1ha2Ug c3VyZSBJIHVuZGVyc3RhbmQgd2hhdCBEYW4gaGFzIGluIG1pbmQgZm9yIHRoZSB2bWEKPj4gY2hl Y2tpbmcsIGluIHRoZSBvdGhlciB0aHJlYWQuLi4KPiAKPiBJdCdzIG5vdCByZWR1bmRhbnQgcmVs YXRpdmUgdG8gdXBzdHJlYW0gd2hpY2ggZG9lcyBub3QgZG8gYW55dGhpbmcgdGhlCj4gRk9MTF9M T05HVEVSTSBpbiB0aGUgZ3VwLXNsb3cgcGF0aC4uLiBidXQgSSBoYXZlIG5vdCBsb29rZWQgYXQg cGF0Y2hlcwo+IDEtNyB0byBzZWUgaWYgc29tZXRoaW5nIHRoZXJlIG1hZGUgaXQgcmVkdW5kYW50 Lgo+IAoKVGhlcmUgaXMgbm90aGluZyBpbiBwYXRjaGVzIDEtNyB0aGF0IHdvdWxkIG1ha2UgaXQg cmVkdW5kYW50LiAKCkFib3V0IHRoZSBvbmx5IHRoaW5nIHRoYXQgeW91IG1pZ2h0IGZpbmQgaW50 ZXJlc3RpbmcgaW4gdGhhdCBzdWJzZXQgaXMKcGF0Y2ggNCAoIm1tOiBkZXZtYXA6IHJlZmFjdG9y IDEtYmFzZWQgcmVmY291bnRpbmcgZm9yIFpPTkVfREVWSUNFIHBhZ2VzIiksCmZvciBkZXZtYXAg YW5kIFpPTkVfREVWSUNFIGludGVyZXN0LiBCdXQgaXQgZG9lc24ndCBhZmZlY3QgdGhpcwpkaXNj dXNzaW9uIGRpcmVjdGx5LgoKCnRoYW5rcywKLS0gCkpvaG4gSHViYmFyZApOVklESUEKX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KZHJpLWRldmVsIG1haWxp bmcgbGlzdApkcmktZGV2ZWxAbGlzdHMuZnJlZWRlc2t0b3Aub3JnCmh0dHBzOi8vbGlzdHMuZnJl ZWRlc2t0b3Aub3JnL21haWxtYW4vbGlzdGluZm8vZHJpLWRldmVs