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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 42077C04AB5 for ; Thu, 6 Jun 2019 13:26:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 12A9620866 for ; Thu, 6 Jun 2019 13:26:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727783AbfFFN0v (ORCPT ); Thu, 6 Jun 2019 09:26:51 -0400 Received: from mail-wm1-f67.google.com ([209.85.128.67]:52808 "EHLO mail-wm1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726693AbfFFN0v (ORCPT ); Thu, 6 Jun 2019 09:26:51 -0400 Received: by mail-wm1-f67.google.com with SMTP id s3so2451716wms.2 for ; Thu, 06 Jun 2019 06:26:49 -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=9wSjXPH8rNO7SJCB3GaTq5vtXd55xhL3x51N5Y3ikYk=; b=lny5ZuZTWK7wxnF9z1YTjnPxCLpk48t+YlnKQ6OG4CHuiBOhWBLtdt5C1F1nrG1msi QYgPBDS6ok9UmjFFy2k3COQWKR7G/Ug49sEPcAnq4/onPMLfHTZHJ/aq6IA4f0gAvDlp YMC6ptnxuVdxHrBJTaDGQTyP1PEiV1hifv9mtgGMZOTrxbOWzLIWnFHxoYCEdcLimXAK p8PoRqfMq64qfYceTa4hkB26IH8s9LPpHj68Lb+WJ4dbO2wak11erguCHAg0wNLGoXPT a6lSNpHxMdSb25U7A3KplBHZaJk7s/33RFk7IkkLKFieYspsKzP1xcf1hDtRcHZIRXtF P5AQ== X-Gm-Message-State: APjAAAV+pZBVnNqg1r1PiIWSmks47YhoTQy7mQVGJpAjtDfS+k4Hpkin KRdaPJAqGgTnRVsn3BbO7bV1Dg== X-Google-Smtp-Source: APXvYqxa5AnIEdt4DsFLD1DYpyFqndHE9b4Qcoj/75WCvGOiNGeCXAxRktiQMhQRzPfyAFYw+eGT6Q== X-Received: by 2002:a1c:452:: with SMTP id 79mr3493261wme.149.1559827609011; Thu, 06 Jun 2019 06:26:49 -0700 (PDT) Received: from ?IPv6:2001:b07:6468:f312:657f:501:149f:5617? ([2001:b07:6468:f312:657f:501:149f:5617]) by smtp.gmail.com with ESMTPSA id b14sm1135803wro.5.2019.06.06.06.26.48 (version=TLS1_3 cipher=AEAD-AES128-GCM-SHA256 bits=128/128); Thu, 06 Jun 2019 06:26:48 -0700 (PDT) Subject: Re: [PATCH 1/7] KVM: nVMX: Intercept VMWRITEs to read-only shadow VMCS fields To: Sean Christopherson , =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= Cc: kvm@vger.kernel.org, Jim Mattson , Liran Alon References: <20190507153629.3681-1-sean.j.christopherson@intel.com> <20190507153629.3681-2-sean.j.christopherson@intel.com> From: Paolo Bonzini Message-ID: <21044f4f-80e8-7a15-9a8c-daaec888d3d0@redhat.com> Date: Thu, 6 Jun 2019 15:26:47 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190507153629.3681-2-sean.j.christopherson@intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 07/05/19 17:36, Sean Christopherson wrote: > Note, "writable" in this context means > + * "writable by the guest", i.e. tagged SHADOW_FIELD_RW. Note #2, the set of > + * fields tagged SHADOW_FIELD_RO may or may not align with the "read-only" > + * VM-exit information fields (which are actually writable if the vCPU is > + * configured to support "VMWRITE to any supported field in the VMCS"). "There's a few more pages of P.S.'s here" (https://youtu.be/rKlrTJ7WN18?t=170) Paolo