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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,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 0E456C54FCB for ; Fri, 24 Apr 2020 21:24:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E2D292098B for ; Fri, 24 Apr 2020 21:24:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726116AbgDXVYO (ORCPT ); Fri, 24 Apr 2020 17:24:14 -0400 Received: from mga02.intel.com ([134.134.136.20]:14211 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726027AbgDXVYN (ORCPT ); Fri, 24 Apr 2020 17:24:13 -0400 IronPort-SDR: T1m5UudrK23502ym97sRA/c86MdIFscETFKYZ30i4JeHYcK9jSMS3gmdoFWqZ/G+/kpYeNFEYs ZggYEw+wipWg== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Apr 2020 14:24:12 -0700 IronPort-SDR: WD2+kmF4Fvmbh+l3fWrp7J4751BAafQ7p+r3oQK3Yup6l3KTC5QL0olYs5Q0qmeafgG214jyq7 tUTx56M/ZQlg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,313,1583222400"; d="scan'208";a="259971308" Received: from bfallaha-mobl2.amr.corp.intel.com (HELO [10.252.132.86]) ([10.252.132.86]) by orsmga006.jf.intel.com with ESMTP; 24 Apr 2020 14:24:11 -0700 Subject: Re: [PATCH] Allow RDTSC and RDTSCP from userspace To: Mike Stunes , joro@8bytes.org Cc: dan.j.williams@intel.com, dave.hansen@linux.intel.com, hpa@zytor.com, jgross@suse.com, jroedel@suse.de, jslaby@suse.cz, keescook@chromium.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, luto@kernel.org, peterz@infradead.org, thellstrom@vmware.com, thomas.lendacky@amd.com, virtualization@lists.linux-foundation.org, x86@kernel.org, Sean Christopherson References: <20200319091407.1481-56-joro@8bytes.org> <20200424210316.848878-1-mstunes@vmware.com> From: Dave Hansen Openpgp: preference=signencrypt Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.1 MIME-Version: 1.0 In-Reply-To: <20200424210316.848878-1-mstunes@vmware.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 4/24/20 2:03 PM, Mike Stunes wrote: > I needed to allow RDTSC(P) from userspace and in early boot in order to > get userspace started properly. Patch below. > > --- > SEV-ES guests will need to execute rdtsc and rdtscp from userspace and > during early boot. Move the rdtsc(p) #VC handler into common code and > extend the #VC handlers. Do SEV-ES guests _always_ #VC on rdtsc(p)?