From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f169.google.com (mail-pd0-f169.google.com [209.85.192.169]) by kanga.kvack.org (Postfix) with ESMTP id A5B656B0031 for ; Sun, 29 Jun 2014 21:44:43 -0400 (EDT) Received: by mail-pd0-f169.google.com with SMTP id g10so7406319pdj.0 for ; Sun, 29 Jun 2014 18:44:43 -0700 (PDT) Received: from heian.cn.fujitsu.com ([59.151.112.132]) by mx.google.com with ESMTP id rz10si21351899pbc.56.2014.06.29.18.44.41 for ; Sun, 29 Jun 2014 18:44:42 -0700 (PDT) Message-ID: <53B0C13C.20206@cn.fujitsu.com> Date: Mon, 30 Jun 2014 09:45:32 +0800 From: Tang Chen MIME-Version: 1.0 Subject: Re: [RFC PATCH 1/1] Move two pinned pages to non-movable node in kvm. References: <1403070600-6083-1-git-send-email-tangchen@cn.fujitsu.com> <20140618061230.GA10948@minantech.com> <53A136C4.5070206@cn.fujitsu.com> <20140619092031.GA429@minantech.com> <20140619190024.GA3887@amt.cnet> <20140620111509.GE20764@minantech.com> <20140620125326.GA22283@amt.cnet> <20140620142622.GA28698@minantech.com> <20140620203146.GA6580@amt.cnet> <20140620203903.GA7838@amt.cnet> In-Reply-To: <20140620203903.GA7838@amt.cnet> Content-Type: text/plain; charset="ISO-8859-1"; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Marcelo Tosatti Cc: Gleb Natapov , pbonzini@redhat.com, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, mgorman@suse.de, yinghai@kernel.org, isimatu.yasuaki@jp.fujitsu.com, guz.fnst@cn.fujitsu.com, laijs@cn.fujitsu.com, kvm@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, linux-kernel@vger.kernel.org, Avi Kivity , Tang Chen On 06/21/2014 04:39 AM, Marcelo Tosatti wrote: > On Fri, Jun 20, 2014 at 05:31:46PM -0300, Marcelo Tosatti wrote: >>> IIRC your shadow page pinning patch series support flushing of ptes >>> by mmu notifier by forcing MMU reload and, as a result, faulting in of >>> pinned pages during next entry. Your patch series does not pin pages >>> by elevating their page count. >> >> No but PEBS series does and its required to stop swap-out >> of the page. > > Well actually no because of mmu notifiers. > > Tang, can you implement mmu notifiers for the other breaker of > mem hotplug ? Hi Marcelo, I made a patch to update ept and apic pages when finding them in the next ept violation. And I also updated the APIC_ACCESS_ADDR phys_addr. The pages can be migrated, but the guest crached. How do I stop guest from access apic pages in mmu_notifier when the page migration starts ? Do I need to stop all the vcpus by set vcpu state to KVM_MP_STATE_HALTED ? If so, the vcpu will not able to go to the next ept violation. So, may I write any specific value into APIC_ACCESS_ADDR to stop guest from access to apic page ? Thanks. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org