linux-kernel - Re: [RFC PATCH kernel vfio] mm: vfio: Move pages out of CMA before pinning

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Message-ID: <1439805499.2416.14.camel@kernel.crashing.org>
Date:	Mon, 17 Aug 2015 19:58:19 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Vlastimil Babka <vbabka@...e.cz>,
	Alexey Kardashevskiy <aik@...abs.ru>, linux-mm@...ck.org
Cc:	Alexander Duyck <alexander.h.duyck@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Gibson <david@...son.dropbear.id.au>,
	Johannes Weiner <hannes@...xchg.org>,
	Joonsoo Kim <js1304@...il.com>, Mel Gorman <mgorman@...e.de>,
	Michal Hocko <mhocko@...e.cz>,
	Paul Mackerras <paulus@...ba.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	linux-kernel@...r.kernel.org,
	Alex Williamson <alex.williamson@...hat.com>,
	Alexander Graf <agraf@...e.de>,
	Paolo Bonzini <pbonzini@...hat.com>,
	"Aneesh Kumar K . V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [RFC PATCH kernel vfio] mm: vfio: Move pages out of CMA before
 pinning

On Mon, 2015-08-17 at 11:53 +0200, Vlastimil Babka wrote:
> I meant why the kernel used for QEMU has also CMA enabled and used 
> (for 
> something else)? CMA is mostly used on mobile devices and they don't 
> run 
> QEMU?

I explained in a separeate reply but yes, we do use a CMA for KVM for
our MMU hash tables.

Cheers,
Ben.

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