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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 369CBC7618B for ; Wed, 24 Jul 2019 08:05:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0DBD9227BF for ; Wed, 24 Jul 2019 08:05:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725983AbfGXIF2 (ORCPT ); Wed, 24 Jul 2019 04:05:28 -0400 Received: from mail-qt1-f196.google.com ([209.85.160.196]:40393 "EHLO mail-qt1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725851AbfGXIF2 (ORCPT ); Wed, 24 Jul 2019 04:05:28 -0400 Received: by mail-qt1-f196.google.com with SMTP id a15so44572249qtn.7 for ; Wed, 24 Jul 2019 01:05:27 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to; bh=474FJ4CjTLJhnSN+huYP4Jd3bf8v5qgo4+UVMvlOmIY=; b=rG9kEWWNiqKtvifdJ7oTb0rt7guZ2lc7hbzffNabY0c2T5Aw41YXAEHAu+GvNbRTrz 05mMtB5VO5c5Lklby4cHYVtzHGgeuKpM+dRDJjuO/SJt3eRoTUgKzt2ZS0Sizf82AaUl T/8Z5UBjHODAU7d/UMvDv4QET9Ljgwj95gd8A1mLQdEdxkCM5MQmUlXXaWsF/xSGxEb/ i2GW8wj+HdrANH/0mEqiq/el8MXPVtRYL1YsFk3RFIWnHAqHbkG+tIQh6lvtdNyBjthV waVncR/8GJyP2vFS5p3kYKsDIeXdHSouImRwnZPpOQ2AUSmwPlPwrN5u0T3FDKBfKTKE khMg== X-Gm-Message-State: APjAAAVgjuyMYnUuC7ZK11ra5rv/M9b9UoH5y+n9rQX42ZXljsJVI3+Q XnbUnvW0rxXCOGXweGK2XhclFg== X-Google-Smtp-Source: APXvYqw6ZQ1xEgGDaGfr+FokaUeYzIX8sH8l8tvdJOvhZHCA1+JFXeX8ZY5yCCc6YIRs25mpDti6IA== X-Received: by 2002:ac8:1106:: with SMTP id c6mr4002540qtj.332.1563955526892; Wed, 24 Jul 2019 01:05:26 -0700 (PDT) Received: from redhat.com (bzq-79-181-91-42.red.bezeqint.net. [79.181.91.42]) by smtp.gmail.com with ESMTPSA id u11sm19337738qkk.76.2019.07.24.01.05.20 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Wed, 24 Jul 2019 01:05:25 -0700 (PDT) Date: Wed, 24 Jul 2019 04:05:17 -0400 From: "Michael S. Tsirkin" To: Jason Wang Cc: syzbot , aarcange@redhat.com, akpm@linux-foundation.org, christian@brauner.io, davem@davemloft.net, ebiederm@xmission.com, elena.reshetova@intel.com, guro@fb.com, hch@infradead.org, james.bottomley@hansenpartnership.com, jglisse@redhat.com, keescook@chromium.org, ldv@altlinux.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-parisc@vger.kernel.org, luto@amacapital.net, mhocko@suse.com, mingo@kernel.org, namit@vmware.com, peterz@infradead.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk, wad@chromium.org Subject: Re: WARNING in __mmdrop Message-ID: <20190724040238-mutt-send-email-mst@kernel.org> References: <20190722035657-mutt-send-email-mst@kernel.org> <20190723010156-mutt-send-email-mst@kernel.org> <124be1a2-1c53-8e65-0f06-ee2294710822@redhat.com> <20190723032800-mutt-send-email-mst@kernel.org> <20190723062221-mutt-send-email-mst@kernel.org> <9baa4214-67fd-7ad2-cbad-aadf90bbfc20@redhat.com> <20190723110219-mutt-send-email-mst@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Sender: linux-parisc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org On Wed, Jul 24, 2019 at 10:17:14AM +0800, Jason Wang wrote: > > On 2019/7/23 下午11:02, Michael S. Tsirkin wrote: > > On Tue, Jul 23, 2019 at 09:34:29PM +0800, Jason Wang wrote: > > > On 2019/7/23 下午6:27, Michael S. Tsirkin wrote: > > > > > Yes, since there could be multiple co-current invalidation requests. We need > > > > > count them to make sure we don't pin wrong pages. > > > > > > > > > > > > > > > > I also wonder about ordering. kvm has this: > > > > > > /* > > > > > > * Used to check for invalidations in progress, of the pfn that is > > > > > > * returned by pfn_to_pfn_prot below. > > > > > > */ > > > > > > mmu_seq = kvm->mmu_notifier_seq; > > > > > > /* > > > > > > * Ensure the read of mmu_notifier_seq isn't reordered with PTE reads in > > > > > > * gfn_to_pfn_prot() (which calls get_user_pages()), so that we don't > > > > > > * risk the page we get a reference to getting unmapped before we have a > > > > > > * chance to grab the mmu_lock without mmu_notifier_retry() noticing. > > > > > > * > > > > > > * This smp_rmb() pairs with the effective smp_wmb() of the combination > > > > > > * of the pte_unmap_unlock() after the PTE is zapped, and the > > > > > > * spin_lock() in kvm_mmu_notifier_invalidate_() before > > > > > > * mmu_notifier_seq is incremented. > > > > > > */ > > > > > > smp_rmb(); > > > > > > > > > > > > does this apply to us? Can't we use a seqlock instead so we do > > > > > > not need to worry? > > > > > I'm not familiar with kvm MMU internals, but we do everything under of > > > > > mmu_lock. > > > > > > > > > > Thanks > > > > I don't think this helps at all. > > > > > > > > There's no lock between checking the invalidate counter and > > > > get user pages fast within vhost_map_prefetch. So it's possible > > > > that get user pages fast reads PTEs speculatively before > > > > invalidate is read. > > > > > > > > -- > > > > > > In vhost_map_prefetch() we do: > > > > > >         spin_lock(&vq->mmu_lock); > > > > > >         ... > > > > > >         err = -EFAULT; > > >         if (vq->invalidate_count) > > >                 goto err; > > > > > >         ... > > > > > >         npinned = __get_user_pages_fast(uaddr->uaddr, npages, > > >                                         uaddr->write, pages); > > > > > >         ... > > > > > >         spin_unlock(&vq->mmu_lock); > > > > > > Is this not sufficient? > > > > > > Thanks > > So what orders __get_user_pages_fast wrt invalidate_count read? > > > So in invalidate_end() callback we have: > > spin_lock(&vq->mmu_lock); > --vq->invalidate_count; >         spin_unlock(&vq->mmu_lock); > > > So even PTE is read speculatively before reading invalidate_count (only in > the case of invalidate_count is zero). The spinlock has guaranteed that we > won't read any stale PTEs. > > Thanks I'm sorry I just do not get the argument. If you want to order two reads you need an smp_rmb or stronger between them executed on the same CPU. Executing any kind of barrier on another CPU will have no ordering effect on the 1st one. So if CPU1 runs the prefetch, and CPU2 runs invalidate callback, read of invalidate counter on CPU1 can bypass read of PTE on CPU1 unless there's a barrier in between, and nothing CPU2 does can affect that outcome. What did I miss? > > > 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=-0.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED 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 2AF49C7618B for ; Wed, 24 Jul 2019 08:05:51 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 F31DE227BF for ; Wed, 24 Jul 2019 08:05:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="GaYKAUUU" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F31DE227BF Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=LmLxJ42GcldRD4RJWelii/bTp+yoIiahOqllILxITfk=; b=GaYKAUUU2lv52p WW5fsjKVrvT6P/Dw4U24AdEfLsNvOgi3hmtqafaH/uMcy5Etk7XGBHbPRoGYMUaP+DHfSpZRgclp5 6HJtoJdggOwNIzMyN5+ghuim4NLTF16tIKGPFp/62KQtVIHDzSKwcK3fr69eTrkyHJWFXTKB8L7kV +hRYpXES/xWXqgo8WU0y6XAPWPJPl+aCz/7go+5aEs8sEuulEXHKBme6njJcNFmehzTXRobZ0tF4V rVl4V8f6Z3Ze5ewQU9Mjwv6DRRHqwClkyGGLOKuyB0tEmZTtOgkXwzDlfmtFmNwjq9bxEHGTCOCMQ 02cJ6Abv6q1gu3oXlmOQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hqCHP-0001BX-Cx; Wed, 24 Jul 2019 08:05:43 +0000 Received: from mail-qt1-f195.google.com ([209.85.160.195]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hqCHB-00012H-6g for linux-arm-kernel@lists.infradead.org; Wed, 24 Jul 2019 08:05:31 +0000 Received: by mail-qt1-f195.google.com with SMTP id n11so44586303qtl.5 for ; Wed, 24 Jul 2019 01:05:27 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to; bh=474FJ4CjTLJhnSN+huYP4Jd3bf8v5qgo4+UVMvlOmIY=; b=G4+iKZG/1nhGvAqbz6TkTzazmkQhFa16mq3L2TOEc98WZAfIGEpyVfCosNyh35tN6E g85gGDRb3SIyv+8g95uVle+kTtDilW2uXZqaM7n0gd3PataYwryg+Ah9DgVF4ucXLVtH EmgvVHujClz/okNkaJlTfXou7UxlWgMj6ayNFlq9Tpuw3p+zIZoe9Of7Ez+mnbfAkdnD 3kXQKEb2J71EhIZ17SfJ+2LicPnnQYt6Qn4mZvIb02klx16Xm73IRsNzuE4QwDXzzIvC wmW8g9i+ZEPj21AXhJ3l/DRkq6rKC/AKPJ1OQfQ8YcrXlemvnUCO/TNq5W9JCqjSYF1E r3bQ== X-Gm-Message-State: APjAAAV+eJfnZD9ThQE1+MThViMahaQkElgqPxnDi6h0xyrAkOOGPp8h 6GviuC+znc82bICfjOoOdL/zTA== X-Google-Smtp-Source: APXvYqw6ZQ1xEgGDaGfr+FokaUeYzIX8sH8l8tvdJOvhZHCA1+JFXeX8ZY5yCCc6YIRs25mpDti6IA== X-Received: by 2002:ac8:1106:: with SMTP id c6mr4002540qtj.332.1563955526892; Wed, 24 Jul 2019 01:05:26 -0700 (PDT) Received: from redhat.com (bzq-79-181-91-42.red.bezeqint.net. [79.181.91.42]) by smtp.gmail.com with ESMTPSA id u11sm19337738qkk.76.2019.07.24.01.05.20 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Wed, 24 Jul 2019 01:05:25 -0700 (PDT) Date: Wed, 24 Jul 2019 04:05:17 -0400 From: "Michael S. Tsirkin" To: Jason Wang Subject: Re: WARNING in __mmdrop Message-ID: <20190724040238-mutt-send-email-mst@kernel.org> References: <20190722035657-mutt-send-email-mst@kernel.org> <20190723010156-mutt-send-email-mst@kernel.org> <124be1a2-1c53-8e65-0f06-ee2294710822@redhat.com> <20190723032800-mutt-send-email-mst@kernel.org> <20190723062221-mutt-send-email-mst@kernel.org> <9baa4214-67fd-7ad2-cbad-aadf90bbfc20@redhat.com> <20190723110219-mutt-send-email-mst@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190724_010529_330592_10C2025E X-CRM114-Status: GOOD ( 23.04 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mhocko@suse.com, peterz@infradead.org, ldv@altlinux.org, james.bottomley@hansenpartnership.com, linux-mm@kvack.org, namit@vmware.com, mingo@kernel.org, elena.reshetova@intel.com, keescook@chromium.org, aarcange@redhat.com, davem@davemloft.net, hch@infradead.org, christian@brauner.io, syzbot , syzkaller-bugs@googlegroups.com, jglisse@redhat.com, viro@zeniv.linux.org.uk, linux-arm-kernel@lists.infradead.org, wad@chromium.org, linux-parisc@vger.kernel.org, linux-kernel@vger.kernel.org, luto@amacapital.net, ebiederm@xmission.com, akpm@linux-foundation.org, guro@fb.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gV2VkLCBKdWwgMjQsIDIwMTkgYXQgMTA6MTc6MTRBTSArMDgwMCwgSmFzb24gV2FuZyB3cm90 ZToKPiAKPiBPbiAyMDE5LzcvMjMg5LiL5Y2IMTE6MDIsIE1pY2hhZWwgUy4gVHNpcmtpbiB3cm90 ZToKPiA+IE9uIFR1ZSwgSnVsIDIzLCAyMDE5IGF0IDA5OjM0OjI5UE0gKzA4MDAsIEphc29uIFdh bmcgd3JvdGU6Cj4gPiA+IE9uIDIwMTkvNy8yMyDkuIvljYg2OjI3LCBNaWNoYWVsIFMuIFRzaXJr 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