From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752226AbeDJQVy (ORCPT ); Tue, 10 Apr 2018 12:21:54 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:54500 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752181AbeDJQVw (ORCPT ); Tue, 10 Apr 2018 12:21:52 -0400 Date: Tue, 10 Apr 2018 12:21:36 -0400 From: Konrad Rzeszutek Wilk To: KarimAllah Ahmed Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Paolo Bonzini , Radim =?utf-8?B?S3LEjW3DocWZ?= , Thomas Gleixner , Ingo Molnar , "H . Peter Anvin" , x86@kernel.org Subject: Re: [PATCH v3] X86/VMX: Disable VMX preemption timer if MWAIT is not intercepted Message-ID: <20180410162136.GA6602@char.us.oracle.com> References: <1523362546-20909-1-git-send-email-karahmed@amazon.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1523362546-20909-1-git-send-email-karahmed@amazon.de> User-Agent: Mutt/1.8.3 (2017-05-23) X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=8858 signatures=668698 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=587 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1711220000 definitions=main-1804100157 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Apr 10, 2018 at 02:15:46PM +0200, KarimAllah Ahmed wrote: > The VMX-preemption timer is used by KVM as a way to set deadlines for the > guest (i.e. timer emulation). That was safe till very recently when > capability KVM_X86_DISABLE_EXITS_MWAIT to disable intercepting MWAIT was > introduced. According to Intel SDM 25.5.1: Would it make sense to remove the '25.5.1' and just have the chapter name, etc as those do move around?