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Message-ID: <1439805499.2416.14.camel@kernel.crashing.org>
Subject: Re: [RFC PATCH kernel vfio] mm: vfio: Move pages out of CMA before
 pinning
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Mon, 17 Aug 2015 19:58:19 +1000
In-Reply-To: <55D1AF06.5090703@suse.cz>
References: <1438762094-17747-1-git-send-email-aik@ozlabs.ru>
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To: Vlastimil Babka <vbabka@suse.cz>, Alexey Kardashevskiy <aik@ozlabs.ru>, linux-mm@kvack.org
Cc: Alexander Duyck <alexander.h.duyck@redhat.com>, Andrew Morton <akpm@linux-foundation.org>, David Gibson <david@gibson.dropbear.id.au>, Johannes Weiner <hannes@cmpxchg.org>, Joonsoo Kim <js1304@gmail.com>, Mel Gorman <mgorman@suse.de>, Michal Hocko <mhocko@suse.cz>, Paul Mackerras <paulus@samba.org>, Sasha Levin <sasha.levin@oracle.com>, linux-kernel@vger.kernel.org, Alex Williamson <alex.williamson@redhat.com>, Alexander Graf <agraf@suse.de>, Paolo Bonzini <pbonzini@redhat.com>, "Aneesh Kumar K . V" <aneesh.kumar@linux.vnet.ibm.com>, Peter Zijlstra <peterz@infradead.org>

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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