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=-10.4 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,FSL_HELO_FAKE, 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 A5BE0C4338F for ; Thu, 5 Aug 2021 22:52:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7B25660EEA for ; Thu, 5 Aug 2021 22:52:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241454AbhHEWpW (ORCPT ); Thu, 5 Aug 2021 18:45:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43064 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241416AbhHEWpS (ORCPT ); Thu, 5 Aug 2021 18:45:18 -0400 Received: from mail-pj1-x1029.google.com (mail-pj1-x1029.google.com [IPv6:2607:f8b0:4864:20::1029]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CE8C4C061798 for ; Thu, 5 Aug 2021 15:45:03 -0700 (PDT) Received: by mail-pj1-x1029.google.com with SMTP id dw2-20020a17090b0942b0290177cb475142so18540748pjb.2 for ; Thu, 05 Aug 2021 15:45:03 -0700 (PDT) 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=4BfhlnmFVBH/5WZ+qdtlmbrJsorAcYIvFXwLK0XohYE=; b=dv98SU3dX8RvvgAVciCvnnGdC9GdQBT286CvsF4rU/Akmb+g2mgUeL6+xZTH19oea+ PnZBh41abYDMAqjnI9FTwv3orGtpr5ZlF6Oz4r/RkL+jkAalhQf8XE20g/a3UJUf4gLY hfyzyBdWheKYTHb9xX/jYAyv8xfKYxfl9z7yQuPHFBtm5In6vHlXrcgEGy/lFJxQq9VB oDspbK92DQPxh4tua6tBF6eu5oPbIZep2J9Nr2QYPTmTXwQ6vUFd+VzQb2c71QQYU3PU A30umMTNbWF3Fbp/2BRmhGpW/vzx9JMFjtQGysO9xL0mM6utCdWnsnhuiEOw1OjNOYjw HbIg== 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=4BfhlnmFVBH/5WZ+qdtlmbrJsorAcYIvFXwLK0XohYE=; b=YGPu2Cn666+PA4ifWjjtCQvjnHv3HZwYgDFYgTx0FLGJiT9k0oGWDC5M1woxUtvhq3 cLB2Cm9Q51CJUscAFYONzDK5JSmPGAkP0Smp09pd9zpkEhVXWFSeEjRUK2baUvDjbPF1 IKFPiTbQHA4UYrJzeuSYXZUTsHPwYH1gmTs11rG1ZBSlqFdB9zux6jpVAmk62KRBNy+0 z9JWgyKmMEavF2c7gHUAXBr7ATUuqbcjnZJQKYsCUdGIs1wK4dqKyv3ii5VaOIEqBDEw X0+ZzU/W2o42Yz+WRR7AdGik2GljrLWGouP99X2C/F+xmeDAUCIK0MeaQrzb54zhTR06 Gqzg== X-Gm-Message-State: AOAM5317qJHQK+MlBv1cyPlDnDWHzyFv08CiKsFQcNHW8kzWiaqM5wfi hp4dhIh+PgqJd2mVpjioOWWjWLzKuqQMVA== X-Google-Smtp-Source: ABdhPJw4q5DAgxtnqJyDPEsfxXtC/QMaCaEKKBZ1CNwiagIlAz0LXZl+nmurr1SxbQ1y+AedALE82Q== X-Received: by 2002:a17:902:bf01:b029:12c:d762:96c with SMTP id bi1-20020a170902bf01b029012cd762096cmr5872304plb.15.1628203503162; Thu, 05 Aug 2021 15:45:03 -0700 (PDT) Received: from google.com (157.214.185.35.bc.googleusercontent.com. [35.185.214.157]) by smtp.gmail.com with ESMTPSA id d2sm9146309pgv.87.2021.08.05.15.45.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Aug 2021 15:45:02 -0700 (PDT) Date: Thu, 5 Aug 2021 22:44:58 +0000 From: Sean Christopherson To: Jim Mattson Cc: Wei Huang , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, pbonzini@redhat.com, vkuznets@redhat.com, wanpengli@tencent.com, joro@8bytes.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com Subject: Re: [PATCH v1 1/3] KVM: x86: Convert TDP level calculation to vendor's specific code Message-ID: References: <20210805205504.2647362-1-wei.huang2@amd.com> <20210805205504.2647362-2-wei.huang2@amd.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, Aug 05, 2021, Jim Mattson wrote: > On Thu, Aug 5, 2021 at 1:55 PM Wei Huang wrote: > > > > This design assumes that all x86 CPUs have the flexibility of changing the > > nested page table level different from host CPU. > > I can't even parse this sentence. What are you trying to say here? NPT inherits the host's CR4, and thus CR4.LA57. So KVM NPT is stuck using whatever N-level paging the host kernel is using.