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=-2.3 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 2F139C433DF for ; Tue, 19 May 2020 15:32:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1557D20809 for ; Tue, 19 May 2020 15:32:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729297AbgESPcq (ORCPT ); Tue, 19 May 2020 11:32:46 -0400 Received: from mga18.intel.com ([134.134.136.126]:52463 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728725AbgESPcq (ORCPT ); Tue, 19 May 2020 11:32:46 -0400 IronPort-SDR: UC93HEYzRvdDZIkbrYIhRyUsFRF9Pg7bN/AwzjhKIdK3WwQibCzV9pzKzSDs+jh85+SmSDYMGX 1lS/YJTh6jqQ== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 May 2020 08:32:45 -0700 IronPort-SDR: avUOY8WQDBIZrziULGrq5yCY/mAWmxiDQ1LuL+8pObXXf+iea8sJYVAI8a94dC3esXL+QAlpBJ w2sRmTxMEpCg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,410,1583222400"; d="scan'208";a="253386551" Received: from sjchrist-coffee.jf.intel.com (HELO linux.intel.com) ([10.54.74.152]) by fmsmga007.fm.intel.com with ESMTP; 19 May 2020 08:32:45 -0700 Date: Tue, 19 May 2020 08:32:44 -0700 From: Sean Christopherson To: Paolo Bonzini Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Subject: Re: [PATCH] KVM: x86: emulate reserved nops from 0f/18 to 0f/1f Message-ID: <20200519153244.GB13603@linux.intel.com> References: <20200515161919.29249-1-pbonzini@redhat.com> <20200518160720.GB3632@linux.intel.com> <57d9da9b-00ec-3fe0-c69a-f7f00c68a90d@redhat.com> <20200519060156.GB4387@linux.intel.com> <60c2c33c-a316-86d2-118a-96b9f4770559@redhat.com> <20200519075523.GE5189@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, May 19, 2020 at 10:06:25AM +0200, Paolo Bonzini wrote: > On 19/05/20 09:55, Sean Christopherson wrote: > > Tangentially related, isn't the whole fastop thing doomed once CET kernel > > support lands? > > Why? You do need to add endbr markers and some of the fastop handlers > won't fit in 8 bytes, but that should be it. Never mind, had a brain fart and forgot CALL_NOSPEC shouldn't get patched to a retpoline on CET capable CPUs.