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Date:	Mon, 30 Jun 2014 09:45:32 +0800
From:	Tang Chen <>
To:	Marcelo Tosatti <>
CC:	Gleb Natapov <>, <>,
	<>, <>, <>,
	<>, <>,
	<>, <>,
	<>, <>,
	<>, <>,
	<>, Avi Kivity <>,
	Tang Chen <>
Subject: Re: [RFC PATCH 1/1] Move two pinned pages to non-movable node in

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 ?

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