From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934915AbdKPQHA (ORCPT ); Thu, 16 Nov 2017 11:07:00 -0500 Received: from userp1040.oracle.com ([156.151.31.81]:22305 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750867AbdKPQGx (ORCPT ); Thu, 16 Nov 2017 11:06:53 -0500 Date: Thu, 16 Nov 2017 11:06:13 -0500 From: Konrad Rzeszutek Wilk To: Paolo Bonzini Cc: Wanpeng Li , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Radim =?utf-8?B?S3LEjW3DocWZ?= , Peter Zijlstra , Wanpeng Li Subject: Re: [PATCH v5 2/4] KVM: X86: Add paravirt remote TLB flush Message-ID: <20171116160613.GY21113@char.us.oracle.com> References: <1510567280-19376-1-git-send-email-wanpeng.li@hotmail.com> <1510567280-19376-3-git-send-email-wanpeng.li@hotmail.com> <20171115211145.GY21113@char.us.oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.8.3 (2017-05-23) X-Source-IP: aserv0022.oracle.com [141.146.126.234] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Nov 16, 2017 at 12:00:45PM +0100, Paolo Bonzini wrote: > On 15/11/2017 22:11, Konrad Rzeszutek Wilk wrote: > > If we migrate to another host that does not expose this, should the > > flush_tlb_others be reset back to the generic one? Or we don't care that > > much ? > > Migration to a host that does not expose the feature would be a > configuration error. Right, so should there be an check somewhere to disallow this ? Or at least print out a "Hey, this is not a good idea!" > > Paolo