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

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Message-ID: <20140622091927.GA18167@minantech.com>
Date:	Sun, 22 Jun 2014 12:19:27 +0300
From:	Gleb Natapov <gleb@...nel.org>
To:	Marcelo Tosatti <mtosatti@...hat.com>
Cc:	Tang Chen <tangchen@...fujitsu.com>, 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>
Subject: Re: [RFC PATCH 1/1] Move two pinned pages to non-movable node in kvm.

On Fri, Jun 20, 2014 at 05:31:46PM -0300, Marcelo Tosatti wrote:
> > > Same with the APIC access page.
> > APIC page is always mapped into guest's APIC base address 0xfee00000.
> > The way it works is that when vCPU accesses page at 0xfee00000 the access
> > is translated to APIC access page physical address. CPU sees that access
> > is for APIC page and generates APIC access exit instead of memory access.
> > If address 0xfee00000 is not mapped by EPT then EPT violation exit will
> > be generated instead, EPT mapping will be instantiated, access retired
> > by a guest and this time will generate APIC access exit.
> 
> Right, confused with the other APIC page which the CPU writes (the vAPIC page) 
> to.
> 
That one is allocated with kmalloc.

--
			Gleb.
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