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=-7.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, 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 B068EC49EA7 for ; Fri, 25 Jun 2021 10:25:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 90FB16143E for ; Fri, 25 Jun 2021 10:25:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231486AbhFYK2M (ORCPT ); Fri, 25 Jun 2021 06:28:12 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:27713 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230461AbhFYK2L (ORCPT ); Fri, 25 Jun 2021 06:28:11 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1624616750; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=fG0be8Kc2dwTF6j8KtChCzsOlmu137hmqe59tyGCHkE=; b=P0tELQllzabz6XY2FG0nPf8smHAEZ5pJVdARUVkFYKNZwUsPKFmJjwnGTwr/Jl29c6iv04 pfGSlig1ANmLNTYI7IrqhMWF/UDXIhhf0nbZehqCwLPlEDpt+KTKfj0IJAZHTNA9tlT949 3nlJXP51b9aPvfn+NF1fw44VYMvBeF4= Received: from mail-ej1-f70.google.com (mail-ej1-f70.google.com [209.85.218.70]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-533-OPRCZ2o2OgGn2Sul4g4odw-1; Fri, 25 Jun 2021 06:25:48 -0400 X-MC-Unique: OPRCZ2o2OgGn2Sul4g4odw-1 Received: by mail-ej1-f70.google.com with SMTP id mh17-20020a170906eb91b0290477da799023so2960123ejb.1 for ; Fri, 25 Jun 2021 03:25:48 -0700 (PDT) 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=fG0be8Kc2dwTF6j8KtChCzsOlmu137hmqe59tyGCHkE=; b=StFQQkC//UAqkN8ev1QRrACdUkEVph8WkDts8DEQkilgxfU9DxljQ52q3/rmRadrPy T2uswYmRe7Jzq3YMp3GAbcYjCmh2HNhS3GhH/NZbELZgp5j1gQSruaUvry9LaW80+NDA Dq4Gp1yQrQGGGKhNWM6ksyKg0K298swzpi5FfxlrQSOer0nzHkzH1EAyLo+1u9d+XxIx JxnSS8rOw8zo5Bgg3EJA0sqgRHvvPOYqWVdMzGE++4jiPBXx8EXYSyhbAl4wOHyD0t9i tlO1env6OR3ffXcsC+b1TsuOaQH0RC84ENN3iKvz15OQnmHVS9+5y+ATMGTDjYsE57hm Kx9w== X-Gm-Message-State: AOAM532R8ueCYQevmPpUFMlM+l/3yCqL+m8RayZFHh8ov7Igu6fRHI8w udlmzT2afVqrQpklakbot4iesbDsDnxjihcK2KjlDR/SO3MhJkDADm9Oe8WQqUjxHEXipxqgxw9 RzFVI2EqUbmI92i/cdpr70Zf6 X-Received: by 2002:a17:906:60d3:: with SMTP id f19mr10301203ejk.413.1624616747784; Fri, 25 Jun 2021 03:25:47 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyWbFg9dFBgEY7PpCIE0Ayv1y0K1VX63+CfNjzZnkmZBL77UmQqvCJ5vh1nGchYaKorPdoArg== X-Received: by 2002:a17:906:60d3:: with SMTP id f19mr10301190ejk.413.1624616747644; Fri, 25 Jun 2021 03:25:47 -0700 (PDT) Received: from ?IPv6:2001:b07:6468:f312:c8dd:75d4:99ab:290a? ([2001:b07:6468:f312:c8dd:75d4:99ab:290a]) by smtp.gmail.com with ESMTPSA id j19sm3631248edw.43.2021.06.25.03.25.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 25 Jun 2021 03:25:47 -0700 (PDT) Subject: Re: [PATCH 05/54] Revert "KVM: x86/mmu: Drop kvm_mmu_extended_role.cr4_la57 hack" To: Yu Zhang Cc: Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Maxim Levitsky References: <20210622175739.3610207-1-seanjc@google.com> <20210622175739.3610207-6-seanjc@google.com> <20210625084644.ort4oojvd27oy4ca@linux.intel.com> <09a49caf-6ff5-295b-d1ab-023549f6a23b@redhat.com> <20210625092902.o4kqx67zvvbudggh@linux.intel.com> From: Paolo Bonzini Message-ID: <885018ab-206b-35c7-a75a-e4fccb663fc3@redhat.com> Date: Fri, 25 Jun 2021 12:25:46 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 In-Reply-To: <20210625092902.o4kqx67zvvbudggh@linux.intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 25/06/21 11:29, Yu Zhang wrote: > Thanks, Paolo. > > Do you mean the L1 can modify its paging mode by setting HOST_CR3 as root of > a PML5 table in VMCS12 and HOST_CR4 with LA57 flipped in VMCS12, causing the > GUEST_CR3/4 being changed in VMCS01, and eventually updating the CR3/4 when > L0 is injecting a VM Exit from L2? Yes, you can even do that without a "full" vmentry by setting invalid guest state in vmcs12. :) Paolo