Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752989AbdLMNcw (ORCPT ); Wed, 13 Dec 2017 08:32:52 -0500 Received: from mx1.redhat.com ([209.132.183.28]:57896 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752714AbdLMNcv (ORCPT ); Wed, 13 Dec 2017 08:32:51 -0500 Subject: Re: [PATCH v8 4/4] KVM: X86: Add flush_on_enter before guest enter To: Peter Zijlstra , Wanpeng Li Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= , Wanpeng Li References: <1513128784-5924-1-git-send-email-wanpeng.li@hotmail.com> <1513128784-5924-5-git-send-email-wanpeng.li@hotmail.com> <20171213125446.bx34qaj3sg6z32xu@hirez.programming.kicks-ass.net> From: Paolo Bonzini Message-ID: Date: Wed, 13 Dec 2017 14:32:48 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.5.0 MIME-Version: 1.0 In-Reply-To: <20171213125446.bx34qaj3sg6z32xu@hirez.programming.kicks-ass.net> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Wed, 13 Dec 2017 13:32:51 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 282 Lines: 10 On 13/12/2017 13:54, Peter Zijlstra wrote: >> + ++vcpu->stat.tlb_flush; >> + kvm_x86_ops->tlb_flush(vcpu, invalidate_gpa); > > WRT to PTI; how much does this actually invalidate? Does this invalidate > the _entire_ guest TLB, or only the current guest PCID? All the PCIDs. Paolo