From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S934245AbdKPLA7 (ORCPT <rfc822;w@1wt.eu>);
        Thu, 16 Nov 2017 06:00:59 -0500
Received: from mx1.redhat.com ([209.132.183.28]:38390 "EHLO mx1.redhat.com"
        rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
        id S934187AbdKPLAt (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
        Thu, 16 Nov 2017 06:00:49 -0500
Subject: Re: [PATCH v5 2/4] KVM: X86: Add paravirt remote TLB flush
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        Wanpeng Li <kernellwp@gmail.com>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
        =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= <rkrcmar@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Wanpeng Li <wanpeng.li@hotmail.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>
From: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <d7ef9549-9339-251f-b0d1-de1a4c83cea0@redhat.com>
Date: Thu, 16 Nov 2017 12:00:45 +0100
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101
 Thunderbird/52.4.0
MIME-Version: 1.0
In-Reply-To: <20171115211145.GY21113@char.us.oracle.com>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 8bit
X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Thu, 16 Nov 2017 11:00:49 +0000 (UTC)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

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.

Paolo