Message-ID: <53B0C13C.20206@cn.fujitsu.com>
Date: Mon, 30 Jun 2014 09:45:32 +0800
From: Tang Chen <tangchen@cn.fujitsu.com>
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To: Marcelo Tosatti <mtosatti@redhat.com>
CC: Gleb Natapov <gleb@kernel.org>, <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 <avi.kivity@gmail.com>, Tang Chen <tangchen@cn.fujitsu.com>
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>
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Sender: linux-kernel-owner@vger.kernel.org

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.
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