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 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id AAA58C61DA4 for ; Mon, 6 Mar 2023 12:57:39 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pZAOi-0005Fm-UX; Mon, 06 Mar 2023 07:57:00 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pZAOf-0005Ea-Tg for qemu-devel@nongnu.org; Mon, 06 Mar 2023 07:56:58 -0500 Received: from mail-pg1-x530.google.com ([2607:f8b0:4864:20::530]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1pZAOb-0007wa-SN for qemu-devel@nongnu.org; Mon, 06 Mar 2023 07:56:55 -0500 Received: by mail-pg1-x530.google.com with SMTP id bn17so5434036pgb.10 for ; Mon, 06 Mar 2023 04:56:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1678107411; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=QflXGVGD25Srpxxqt4y19t+28KMGVEPY2i931OrLEyU=; b=s6jzt8dJO053RbP+UcRJHLChWG+0UQ5J1cDIB5M6dVXwkScPyeVEVe+ju+vZRwb/R5 yCsjqo3pWsMXHbCIxlq285z2q/sJ+eXdGNWagFxCs8s3bXgD0RpEWg3yCel9k/SpPEYY tcw9ivGvNOg8F+gVN9aQvwzON+V6mHRID/cPta6uRzyC3suNLpNgk9Ut0zLTIcp72M/7 N7q3IcLmn0esFew3QMWhij5RI05pOcmeev0XRR8CGaoKHFhvxdX4Z6SNNZNO+Iby4O4y XNRsA7JtjT51BVfLvRQr5BwaPulbIq61H1v0NLosSpga3wd/2g5yJ0i+UTKrboKC/sIC v6Ew== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1678107411; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=QflXGVGD25Srpxxqt4y19t+28KMGVEPY2i931OrLEyU=; b=eJ9cZXOazsjQ6aputIHsRrthf0X36s6IFtI2LoETOkjXMM4Y6p6cr+eKZm/8Rvf4/q ZnMB/WwY7SsYaTSlqVArMBsIb9P8bd174se01cmhSrijSSgVwhNV7MoNw5qAmKUrb+46 fNwGbLLTZXXUMKjGv7lDLs/s9Vibow8+NAMbKpP7srSdXqTbS9cZJxgQLnOWw9nTfY5N zIC9/nx2EwuKgV6QmSzYBIxatzwCcGdK4afjAMRAdPSBgpa1BVOEvDMyT0JbQVd3SODf ahWo3aAPO0W4wHD2P+xGG3xkrz9Wdv45gHPYHpm8jmmg2QsWXYcN3hxno4rcL1Cg4qb/ g6+Q== X-Gm-Message-State: AO0yUKVzQ+MTCdRu4mdZprapyjwe5gFU/Oh83HlGeJ3UDpN8dvhYrz0p /Lvl/glqS+2JrnIMPyPaq6szsH9K2rpp1c9POD3kfg== X-Google-Smtp-Source: AK7set8f8cpToUzQ+UMshnjMi/ej7xjMTopvjgd5mQAS8SweJuseibzl8pOHRHyl76AgTtIBL7kHykf20kbR6EgFkts= X-Received: by 2002:a62:db45:0:b0:606:653c:f19b with SMTP id f66-20020a62db45000000b00606653cf19bmr4483753pfg.5.1678107411034; Mon, 06 Mar 2023 04:56:51 -0800 (PST) MIME-Version: 1.0 References: <20230306021307.1879483-1-richard.henderson@linaro.org> <20230306021307.1879483-2-richard.henderson@linaro.org> In-Reply-To: <20230306021307.1879483-2-richard.henderson@linaro.org> From: Peter Maydell Date: Mon, 6 Mar 2023 12:56:39 +0000 Message-ID: Subject: Re: [PATCH 1/9] linux-user: Diagnose incorrect -R size To: Richard Henderson Cc: qemu-devel@nongnu.org Content-Type: text/plain; charset="UTF-8" Received-SPF: pass client-ip=2607:f8b0:4864:20::530; envelope-from=peter.maydell@linaro.org; helo=mail-pg1-x530.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Mon, 6 Mar 2023 at 02:14, Richard Henderson wrote: > > Zero is the value for 'off', and should not be used with -R. > We have been enforcing host page alignment for the non-R > fallback of MAX_RESERVED_VA, but failing to enforce for -R. I'm pretty sure we have users who specifically use "-R 0" to ask for "definitely turn off any reserved VA". Here's a random example from an old gcc bug report: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60681 and somebody using it via the environment variable: https://www.openembedded.org/pipermail/openembedded-core/2015-January/100572.html thanks -- PMM