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[23.128.96.18]) by mx.google.com with ESMTP id ce9si3819989ejc.139.2020.04.24.14.28.04; Fri, 24 Apr 2020 14:28:28 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726105AbgDXVYO (ORCPT + 99 others); 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)?