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=-13.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL 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 D66CBC433E0 for ; Thu, 18 Feb 2021 18:45:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9121664EB7 for ; Thu, 18 Feb 2021 18:45:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231447AbhBRSnt (ORCPT ); Thu, 18 Feb 2021 13:43:49 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42362 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233411AbhBRQYn (ORCPT ); Thu, 18 Feb 2021 11:24:43 -0500 Received: from mail-pj1-x102a.google.com (mail-pj1-x102a.google.com [IPv6:2607:f8b0:4864:20::102a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0010EC061788 for ; Thu, 18 Feb 2021 08:24:01 -0800 (PST) Received: by mail-pj1-x102a.google.com with SMTP id c19so1637328pjq.3 for ; Thu, 18 Feb 2021 08:24:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=7zsJa5G96QbfzfGP1GUeN5cQ6tflYt1YqBlPzygiUVU=; b=Op9KFq/D8S6hUm3uN8wid54j0rwTGYg0n1s/L5rbJ3861uOm8LFv1Cr0ItlKReGHlm 0Oq/cgmC8gF2E/3AAuheF6PlVc8QGi9Y5znFhso54yshc0RKxwBT3MCn2aJGM1hILGoC 6EQ8kOnPaQL63Ly34Jg80Lk1gqsBvZwPXJfvdGntgAElCI2fFt/4qmiH/TXwAJsOIpsX 9mQVtwHQ4LsZYV1ka4cEuatiwMTW36nREbbXVjOjIQ8VpCQWCPfNLPzShoPrt1QKGOxG VO4wr2X3LawDYhGbTR+eWX3UmFjJ2ydbfhLtNB5SzAji1ijhAAdLV5IC84G1Lntgt2PV F+vw== 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:in-reply-to; bh=7zsJa5G96QbfzfGP1GUeN5cQ6tflYt1YqBlPzygiUVU=; b=rgR8DNxLhc7vgPMDt7tE8Bv8zqcEoBFvr/AnDcszr7k7rhde2A3olNv/2TVMUOjGLT gblLI9mh265OHkECyrbs0PzDWh/R3g/Q7subvmdMKRCvMfBGBocm3C9i05NTJR9aF43A jBmOkdA1/poMmmGPTSqA6pb/X4jtfuMDkoLmyClzSKBV9W24YT5WMDUeJpjUF/yhWw+D Q4z2wTeeFhg6ZbVn6dme3lBmIDaK2fCWcQEIuakZrUqUhLofOFDXl/+cTENiMpli86mb ULa6CBimRZDmU4kmHqZggioTwXVQzAdd43TB1VhbKyWcnTXam0WSvHjjJq9KZQDBuj2N rqEQ== X-Gm-Message-State: AOAM53238335kv75lWDPj0alHlXA/gx0N9VhORfMQ2rxn0T0Zp7JqUVi ZO/JcijqJ8fBvkcNYXOe3znadA== X-Google-Smtp-Source: ABdhPJwQbfGU3Wbtmu5ZkDWW8j1ysqNCykojI28OXgaOS4Yu8u6jFFg02JjmGh6SpqzKahhgI7b47g== X-Received: by 2002:a17:90a:ac14:: with SMTP id o20mr4668126pjq.171.1613665441048; Thu, 18 Feb 2021 08:24:01 -0800 (PST) Received: from google.com ([2620:15c:f:10:dc76:757f:9e9e:647c]) by smtp.gmail.com with ESMTPSA id y12sm5736500pjc.56.2021.02.18.08.23.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Feb 2021 08:24:00 -0800 (PST) Date: Thu, 18 Feb 2021 08:23:54 -0800 From: Sean Christopherson To: Paolo Bonzini Cc: Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Ben Gardon , Makarand Sonare Subject: Re: [PATCH 05/14] KVM: x86/mmu: Consult max mapping level when zapping collapsible SPTEs Message-ID: References: <20210213005015.1651772-1-seanjc@google.com> <20210213005015.1651772-6-seanjc@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Feb 18, 2021, Paolo Bonzini wrote: > On 13/02/21 01:50, Sean Christopherson wrote: > > > > pfn = spte_to_pfn(iter.old_spte); > > if (kvm_is_reserved_pfn(pfn) || > > - (!PageTransCompoundMap(pfn_to_page(pfn)) && > > - !kvm_is_zone_device_pfn(pfn))) > > + iter.level >= kvm_mmu_max_mapping_level(kvm, slot, iter.gfn, > > + pfn, PG_LEVEL_NUM)) > > continue; > > > This changes the test to PageCompound. Is it worth moving the change to > patch 1? Yes? I originally did that in a separate patch, then changed my mind. If PageTransCompoundMap() also detects HugeTLB pages, then it is the "better" option as it checks that the page is actually mapped huge. I dropped the change because PageTransCompound() is just a wrapper around PageCompound(), and so I assumed PageTransCompoundMap() would detect HugeTLB pages, too. I'm not so sure about that after rereading the code, yet again.