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=-4.0 required=3.0 tests=BAYES_00,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 E0ACBC433DB for ; Sat, 20 Mar 2021 20:45:37 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 831186193A for ; Sat, 20 Mar 2021 20:45:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 831186193A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+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=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:Cc:To:Subject:Message-ID:Date:From:In-Reply-To: References:MIME-Version:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=nMx5jDEs4xzT9imRO0+4kyplN0dl1XURAP5mbm3d03w=; b=mHx3Vzxkuk7QsnUkxtnhuQH3q CWnIeJOCw2+8BbNcn72jKP8Nnxj4bpnsmGBK5yPC3Eu1XZAKW4nsm8xM8B7q+B/3FZASU5bY31To4 z93NwUzrAr0r2VzPWgVrYx+klQUjgMB0PVoR/bagV08Uwa/lzSjgSLsdlFqwRR6lj/LcKjlanGoby E8QyQfLnY6a3zBVSAz++fRYGQkBsjc9nUr55p/CKwxVQNDLuQPgzQtXWFkwXiL/qhrutJS0HLwjQo lyJ6hD0cmbURrpHe5SgCq7753Sn9u8ulUGWxCKlJ9FgSR0DNniMQ0S4tZqLNC7ZiJXWWX4Sy7V8Ni oeT4pvcpg==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lNiRz-009HEP-LJ; Sat, 20 Mar 2021 20:43:59 +0000 Received: from mail-ej1-x62b.google.com ([2a00:1450:4864:20::62b]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lNiRu-009HDe-5b for linux-arm-kernel@lists.infradead.org; Sat, 20 Mar 2021 20:43:56 +0000 Received: by mail-ej1-x62b.google.com with SMTP id w3so15084690ejc.4 for ; Sat, 20 Mar 2021 13:43:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=9lbfn8RjecBl7XS/SHCSRbhQxIUAJWbOM7gWoOXHnr4=; b=qcmGUuogEiKnWj6ZAeH1gyWrMEYHHIOymreLlbBif8A6x97q3xGOyQrhyamXPT2yOS 6URgb33nBKC0rMATs3+gRyB5Psr7NS/wKEXbE5mLvIK+dI53Y2tNc7Rfr89cMoIaLKWg 3xrqWV98uDhMeb/8mAxamxv6Ar9C4q/bENoZvbdgk9OuSxeAk/idn0etlSpQ28xkInV9 jSWy3VoBh2gqJ2cKpAsX8LtLAX84rULgmO1Y2dKEEiig7SxhmIns/nEyL0p6QKJuoD1D Hor5lf+mTDnCvVC1plpzzabMzWH6CplzkdBuKHBw5DbKn2N89YUl2JW0MrGlq6JY7vAO ylGw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=9lbfn8RjecBl7XS/SHCSRbhQxIUAJWbOM7gWoOXHnr4=; b=R/zURnAt016xKJdvRVuD8paD61b58m+DCve7PveOfAsCD5MKHt0X8D4VDz+51A+v3E 8k9/+6wV78Fz4hz/NBO/VX0l2QYtrbDYq7qJyX9Fa+7B+fJHiqgNLzOmdepn3WdNGHeS oYBzDy/6dxpJV+HmSU/VmlyMQ9Uy4WYJ23YCWMLx8V+UiRC4TYBiCdteZG5Dh6UVHOHm RLObvmQhq4H+LQ4speROEsYP3VY62lrEVY3Qu7RE/W+NYhijmMrsjypljxlowqBoz3kh xLbBaKyvqKvIz1PefyipMVg3b8PEttTtjLgRLUcA9XGio8LQBQMQ/oipM1CNWpwpmzOI CkDw== X-Gm-Message-State: AOAM533HCE+b34/zPVTFdl7YWdNX9XfddeVB6YPY1rAuzKUsf9YtuK8B J4z3bwWN0cG31H9Lb/LYJR67bZO0EFucsQ3md3eETg== X-Google-Smtp-Source: ABdhPJxWc3LoFWsjVKlONqKZAvVGvzN0WMGPObN/ZNOjfXrwDX0FjsgePqnPaDi0gbzedRpKY6xXrINOvyMiXlTXmRI= X-Received: by 2002:a17:906:c301:: with SMTP id s1mr11110091ejz.382.1616273032097; Sat, 20 Mar 2021 13:43:52 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Peter Maydell Date: Sat, 20 Mar 2021 20:43:25 +0000 Message-ID: Subject: Re: arm64 syzbot instances To: Arnd Bergmann Cc: Dmitry Vyukov , Mark Rutland , Marc Zyngier , Will Deacon , Ard Biesheuvel , Linux ARM , syzkaller , LKML , John Garry , =?UTF-8?B?QWxleCBCZW5uw6ll?= X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210320_204354_602158_CA3B359E X-CRM114-Status: GOOD ( 11.13 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, 12 Mar 2021 at 09:16, Arnd Bergmann wrote: > So it's probably qemu that triggers the 'synchronous external > abort' when accessing the PCI I/O space, which in turn hints > towards a bug in qemu. Presumably it only returns data from > I/O ports that are actually mapped to a device when real hardware > is supposed to return 0xffffffff when reading from unused I/O ports. Do you have a reference to the bit of the PCI spec that mandates this -1/discard behaviour for attempted access to places where there isn't actually a PCI device mapped ? The spec is pretty long and hard to read... (Knowing to what extent this behaviour is mandatory for all PCI systems/host controllers vs just "it would be nice if the gpex host controller worked this way" would help in figuring out where in QEMU to change.) thanks -- PMM _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel