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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4BCF1C43334 for ; Thu, 21 Jul 2022 23:06:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233685AbiGUXG0 (ORCPT ); Thu, 21 Jul 2022 19:06:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34590 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233706AbiGUXGL (ORCPT ); Thu, 21 Jul 2022 19:06:11 -0400 Received: from mail-pg1-x52b.google.com (mail-pg1-x52b.google.com [IPv6:2607:f8b0:4864:20::52b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C86BC93682 for ; Thu, 21 Jul 2022 16:06:06 -0700 (PDT) Received: by mail-pg1-x52b.google.com with SMTP id e132so2974354pgc.5 for ; Thu, 21 Jul 2022 16:06:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=87wZkeERCeXfVURi93ftUkOINKaeWlxijauUdSoY5xA=; b=fM7VSUuZ5Z2PC40pfTNXIOFR0ofADrIZupwXOuFZhywxnAMqmaPx48sy1+hMoc5Wqt FAi4s5QxJF54Lg7m2esjHEMCFKCKudPDf7tsK1/UFKyR1mbSV95qW1fRUO01lcIWbrjz XuuAZ1C6oDRlmtqgPKzeuwGkgYx0H15gFKsyurzqg51IJhkNQeQCrY+X/hGLsAPlOaD2 ujIg5nluWzJ6c8kIFeOelQfVI1BU2WEexH/pIPL3SZOndpDyb8PnGoXviwhiVCIQDPfy jsNB13dFGzEjbviib46KqFfA3AMa40SYAZVCezff3OmUJSxGx7sVVmKLeOfTAExUucVJ 0Rcg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=87wZkeERCeXfVURi93ftUkOINKaeWlxijauUdSoY5xA=; b=yjBSQpEZ0nhdwkR3GV42dtgOhAB9GhC8TSCjwO1FmcvWTSWJ1xV5VXNmVGWohVSR8w 0U6/r2ZJt35ZdcmXJVd0gJ7ch/KczehI+SNwCnk5OYldJ2757QT6eQ8vzrj+It2/Q8FZ uehHzMnMzv2GBZ5wqnG0H6+83KLrYgu+5WQImE5pjuNl6H6kcTcPIJphT8/8PPHOuc5N U3dy3SYHJS25tYBMj2rC6okI8mhMNUwuAxFaOHN3Rd4FYq37y+NF9UjbWaII4SBQwBtQ F/1fow6rnyNI5V4jNyPi54YxE3kaaEV+YUe4gmavtTFaFcjn5sFnjHGe9tT0G+qP3rtF hybw== X-Gm-Message-State: AJIora9135eTcWh1MkIEjJ0OlCZUhMjyKWgM6mK+N6iGp9zs+dm1KLBJ HZeROeZW3aoGupqr5UiyfmB3+NBKVu5s9A== X-Google-Smtp-Source: AGRyM1tcNPwrEFwaYRNv6k4BCQmt+bqE5SrACmuSFUKgq3xmhBDBrnyyEmcV4r/DfgnNtdc+SgWcJA== X-Received: by 2002:a05:6a00:2484:b0:52b:2be0:2191 with SMTP id c4-20020a056a00248400b0052b2be02191mr489868pfv.51.1658444765755; Thu, 21 Jul 2022 16:06:05 -0700 (PDT) Received: from google.com (123.65.230.35.bc.googleusercontent.com. [35.230.65.123]) by smtp.gmail.com with ESMTPSA id c6-20020a62f846000000b0052ac99c2c1csm2324716pfm.83.2022.07.21.16.06.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Jul 2022 16:06:05 -0700 (PDT) Date: Thu, 21 Jul 2022 23:06:01 +0000 From: Sean Christopherson To: Vitaly Kuznetsov Cc: kvm@vger.kernel.org, Paolo Bonzini , Anirudh Rayabharam , Wanpeng Li , Jim Mattson , Maxim Levitsky , linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v4 24/25] KVM: VMX: Cache MSR_IA32_VMX_MISC in vmcs_config Message-ID: References: <20220714091327.1085353-1-vkuznets@redhat.com> <20220714091327.1085353-25-vkuznets@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220714091327.1085353-25-vkuznets@redhat.com> Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Thu, Jul 14, 2022, Vitaly Kuznetsov wrote: > @@ -2613,6 +2614,8 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf, > if (((vmx_msr_high >> 18) & 15) != 6) > return -EIO; > > + rdmsrl(MSR_IA32_VMX_MISC, misc_msr); Might make sense to sanitize fields that KVM doesn't use and that are not exposed to L1. Not sure it's worthwhile though as many of the bits fall into a grey area, e.g. all the SMM stuff isn't technically used by KVM, but that's largely because much of it just isn't relevant to virtualization. I'm totally ok leaving it as-is, though maybe name it "unsanitized_misc" or so to make that obvious? > vmcs_conf->size = vmx_msr_high & 0x1fff; > vmcs_conf->basic_cap = vmx_msr_high & ~0x1fff; > > @@ -2624,6 +2627,7 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf, > vmcs_conf->cpu_based_3rd_exec_ctrl = _cpu_based_3rd_exec_control; > vmcs_conf->vmexit_ctrl = _vmexit_control; > vmcs_conf->vmentry_ctrl = _vmentry_control; > + vmcs_conf->misc = misc_msr; > > return 0; > } > @@ -8241,11 +8245,9 @@ static __init int hardware_setup(void) > > if (enable_preemption_timer) { > u64 use_timer_freq = 5000ULL * 1000 * 1000; > - u64 vmx_msr; > > - rdmsrl(MSR_IA32_VMX_MISC, vmx_msr); > cpu_preemption_timer_multi = > - vmx_msr & VMX_MISC_PREEMPTION_TIMER_RATE_MASK; > + vmcs_config.misc & VMX_MISC_PREEMPTION_TIMER_RATE_MASK; > > if (tsc_khz) > use_timer_freq = (u64)tsc_khz * 1000; > -- > 2.35.3 >