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=-7.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,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 F2FBBC433C1 for ; Mon, 22 Mar 2021 15:19:56 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 748C161984 for ; Mon, 22 Mar 2021 15:19:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 748C161984 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:45112 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lOMLT-0004Au-BA for qemu-devel@archiver.kernel.org; Mon, 22 Mar 2021 11:19:55 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:57672) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lOMFZ-0000ua-K3 for qemu-devel@nongnu.org; Mon, 22 Mar 2021 11:13:49 -0400 Received: from mail-qt1-x82a.google.com ([2607:f8b0:4864:20::82a]:43668) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lOMFV-0005m5-5q for qemu-devel@nongnu.org; Mon, 22 Mar 2021 11:13:49 -0400 Received: by mail-qt1-x82a.google.com with SMTP id s2so12552434qtx.10 for ; Mon, 22 Mar 2021 08:13:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=hetBlz7c0fabQ1NKd7qf2+1VqDTEOnGYPx9uRGG/E0E=; b=E0EIChz6Q3oxifs5Wa45Ip5a6J+oqj7DUR9SSsk9q10J2Uo4GqfXvoeBoU/PnfDxjy EzXxcqn39BOhWKt7f/jZPekAe22hoQRp+WRcu27V0GlHAUaEmS69T8HPhrd5LO6zo2Rj wbPgLRczXdkRvdMKIqNU3IcBoN6kji+nI2BL4YzJNocrcniduJhs4/dLReLKF5Bu2kjO txi/owqxR6qY16l1Jd9F6O+iGmtxlZ/qPTUDVWuv9DnlrjfcDfFtEkSu4E5Ny1Qf2X0A JZtqJG7TpW8QSUlrQuwjQPS/q7xjG+ihE+SPPqp/5FC8tFpIG61/RCe5gFad8ec/bTyQ kWiw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=hetBlz7c0fabQ1NKd7qf2+1VqDTEOnGYPx9uRGG/E0E=; b=LRJikRv5jNzmThhFPqWQva+CosrhfACEpyGnto0PyOpdFmQ+Ub+zeIvWJDmyR9/tnq AL5kGLYY5LgN9a15NTl5COBT7Yc8jgfEMeHn0JXZuz/Bcm2j3GUw82k4GdqNOoKMz7gG tTeRyyTth7VotnvFfQAsmEcZL+7P4m0uT9YIuyOn6evgz7hypVhPVrK/F+fKkBdq/FjM HZSrjmGkql0rBmPUdNFWPykwfKxmSv1KyUagVj98FR4YcSJD5blmYffLFoCo6vd831S+ aoVR+J6ITQTUA3eCbV10nQL0ZQNm4uCfWidllJSiKGWHbFcBbyjd5RmWRPlqsR6OvDcc TI/Q== X-Gm-Message-State: AOAM532WVcdmsjE1ZR7XsGrSywvi/fp2in15+TxQKu2ZewMl5EJMzz+t 43jmUC3d7dCeme0/DFlQQXdKhg== X-Google-Smtp-Source: ABdhPJw4UavCzlNM8sSDmhuc/DhgZMmR/zx1kUxfTmHmXPfsQ+hycimeUG1lz/pstNfgWpH0wM6Oow== X-Received: by 2002:aed:2e62:: with SMTP id j89mr353004qtd.310.1616426022754; Mon, 22 Mar 2021 08:13:42 -0700 (PDT) Received: from [10.10.121.52] (fixed-187-189-51-144.totalplay.net. [187.189.51.144]) by smtp.gmail.com with ESMTPSA id z5sm9306509qtc.42.2021.03.22.08.13.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 22 Mar 2021 08:13:42 -0700 (PDT) Subject: Re: [PATCH v3 for-6.0 1/2] tcg: Do not set guard pages on the rx portion of code_gen_buffer To: Roman Bolshakov References: <20210320165720.1813545-1-richard.henderson@linaro.org> <20210320165720.1813545-2-richard.henderson@linaro.org> From: Richard Henderson Message-ID: Date: Mon, 22 Mar 2021 09:13:40 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2607:f8b0:4864:20::82a; envelope-from=richard.henderson@linaro.org; helo=mail-qt1-x82a.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, NICE_REPLY_A=-0.001, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-devel@nongnu.org, j@getutm.app Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 3/22/21 7:56 AM, Roman Bolshakov wrote: > - What does mean that rx might be covered by huge pages? (perhaps I'm > missing some context) Huge pages are where a single level (n-1) page table entry covers the entire span that would be covered by m * level n page table entries. On x86, this is a 2MB hugepage, vs 512 4kB pages. Most modern cpus support something similar. See qemu_madvise(..., QEMU_MADV_HUGEPAGE). r~