linux-kernel - Re: [RFC PATCH 1/1] Move two pinned pages to non-movable node in kvm.

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Message-ID: <53B0C13C.20206@cn.fujitsu.com>
Date:	Mon, 30 Jun 2014 09:45:32 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
CC:	Gleb Natapov <gleb@...nel.org>, <pbonzini@...hat.com>,
	<tglx@...utronix.de>, <mingo@...hat.com>, <hpa@...or.com>,
	<mgorman@...e.de>, <yinghai@...nel.org>,
	<isimatu.yasuaki@...fujitsu.com>, <guz.fnst@...fujitsu.com>,
	<laijs@...fujitsu.com>, <kvm@...r.kernel.org>,
	<linux-mm@...ck.org>, <x86@...nel.org>,
	<linux-kernel@...r.kernel.org>, Avi Kivity <avi.kivity@...il.com>,
	Tang Chen <tangchen@...fujitsu.com>
Subject: Re: [RFC PATCH 1/1] Move two pinned pages to non-movable node in
 kvm.

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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