Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751494AbdILUG3 (ORCPT ); Tue, 12 Sep 2017 16:06:29 -0400 Received: from mx1.redhat.com ([209.132.183.28]:33086 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750869AbdILUGZ (ORCPT ); Tue, 12 Sep 2017 16:06:25 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com D860C8553C Authentication-Results: ext-mx04.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx04.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=jpoimboe@redhat.com Date: Tue, 12 Sep 2017 15:06:23 -0500 From: Josh Poimboeuf To: Andy Lutomirski Cc: x86@kernel.org, linux-kernel@vger.kernel.org, Borislav Petkov , Brian Gerst , Andrew Cooper , Juergen Gross , Boris Ostrovsky , Kees Cook Subject: Re: [RFC 09/17] x86/asm/32: Pull MSR_IA32_SYSENTER_CS update code out of native_load_sp0() Message-ID: <20170912200623.ytigiftoi252pl7a@treble> References: <2c6329543024c4cd53c83833cc31a495797cd07d.1504733277.git.luto@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <2c6329543024c4cd53c83833cc31a495797cd07d.1504733277.git.luto@kernel.org> User-Agent: Mutt/1.6.0.1 (2016-04-01) X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.28]); Tue, 12 Sep 2017 20:06:25 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 395 Lines: 11 On Wed, Sep 06, 2017 at 02:36:54PM -0700, Andy Lutomirski wrote: > This causees the MSR_IA32_SYSENTER_CS write to move out of the > paravirt hook. This shouldn't affect Xen or lgeust: Xen already > ignores MSR_IA32_SYSENTER_ESP writes and lguest doesn't support > SYSENTER at all. In any event, Xen doesn't support vm86() > in a useful way. Thanks to Juergen, lguest is no more :-) -- Josh