Received: by 2002:a25:1985:0:0:0:0:0 with SMTP id 127csp506478ybz; Wed, 29 Apr 2020 04:24:07 -0700 (PDT) X-Google-Smtp-Source: APiQypJp4MshMizryadBogmXZq3KSbQz034Ey/+D5erC5M/Oc4fEoAMZDD+qSXCeREj3TOKT7o2G X-Received: by 2002:a17:906:7c4e:: with SMTP id g14mr2192725ejp.382.1588159446891; Wed, 29 Apr 2020 04:24:06 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1588159446; cv=none; d=google.com; s=arc-20160816; b=HTnqWtotHl4I2oB/mjdtB8DRELbJUBAKu3ZdkjeOxFZYFvwOKLdSMcveHVSBxHIKEH CsSzcnw8OuE9mlBbuGopE3tzIXR7VYSqXCXtOBI3BmZyJgmoN22YTsDrpeVtY4ciWNPP jqMSLOkQQgd4MMzx9TIDTh4xLlcQOaNFwruIdeSxmeL+bY8p9v7crHKXXm9a5l9ChsjW ZdJHBbLBAGBwb3HUVju66uvdf74iAL/6i+T9NXnbEbGfZheQ2RDur7CklhVInxxXBX2N ookD4l2u1LzELdxWot24DYUprG0PRDIh4UIRXGurJ0YKsAQHdrnL7NeVjaI5i96+8v/w jLfQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-disposition:mime-version:references:message-id:subject:cc :to:from:date; bh=OVbNDQr2eyi/kF6e2+ZMLBv25XhPuqXshr9qhTvxKwc=; b=07vvu2Q/vDJLiE7QphTbB+boV2Nmrl2DJAXDkvnpzE7l9hYY6262qWSc9NtMPfBUR8 jz53kkDAu/b98xrSEvLWSAqeSrAlficQkxNIDvC9FVCnUny+U3ZifXPD6t8j3lJtYtnf tadwsnDMguI4yTIF3BRK87A4SQuNLoNjI4VaA5u4gJG5t/urowMu3KCP/TIT1iT++itm f9rDHIR5phqJdqU1iAzfcMaqh3eOtAnzvhp9hrjzE69YHQ8hPuoQcaI1GOY3dJXbjlUD Bs/Yb56Y650+eYybz7rI7mJsN36kNUu+tgZWgxOlOGt97spcdbVRW+FyHhKnp36a3DIE ATUg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=8bytes.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id eb6si4406684edb.271.2020.04.29.04.23.43; Wed, 29 Apr 2020 04:24:06 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=8bytes.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726654AbgD2LUR (ORCPT + 99 others); Wed, 29 Apr 2020 07:20:17 -0400 Received: from 8bytes.org ([81.169.241.247]:39468 "EHLO theia.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726554AbgD2LUR (ORCPT ); Wed, 29 Apr 2020 07:20:17 -0400 Received: by theia.8bytes.org (Postfix, from userid 1000) id 55F392E2; Wed, 29 Apr 2020 13:20:16 +0200 (CEST) Date: Wed, 29 Apr 2020 13:20:14 +0200 From: Joerg Roedel To: Qian Cai Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH] iommu/amd: fix a race in fetch_pte() Message-ID: <20200429112014.GN21900@8bytes.org> References: <20200418121022.GA6113@8bytes.org> <57CBF6B2-4745-4E36-9AA5-7E0876E3DA8F@lca.pw> <20200418183429.GH21900@8bytes.org> <7D03A3E2-647B-4FAD-886D-EE2764EC1EDB@lca.pw> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <7D03A3E2-647B-4FAD-886D-EE2764EC1EDB@lca.pw> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Apr 20, 2020 at 09:26:12AM -0400, Qian Cai wrote: > No dice. There could be some other races. For example, Can you please test this branch: https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git/log/?h=amd-iommu-fixes It has the previous fix in it and a couple more to make sure the device-table is updated and flushed before increase_address_space() updates domain->pt_root. Thanks, Joerg