linux-kernel - Re: [PATCH 3/4] powerpc: preparing to support real mode optimization

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Message-ID: <20130215033740.GC25015@drongo>
Date:	Fri, 15 Feb 2013 14:37:40 +1100
From:	Paul Mackerras <paulus@...ba.org>
To:	aik@...abs.ru
Cc:	Alexander Graf <agraf@...e.de>,
	Michael Ellerman <michael@...erman.id.au>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	kvm-ppc@...r.kernel.org, kvm@...r.kernel.org,
	David Gibson <david@...son.dropbear.id.au>
Subject: Re: [PATCH 3/4] powerpc: preparing to support real mode optimization

On Mon, Feb 11, 2013 at 11:12:42PM +1100, aik@...abs.ru wrote:
> From: Alexey Kardashevskiy <aik@...abs.ru>
> 
> he current VFIO-on-POWER implementation supports only user mode
> driven mapping, i.e. QEMU is sending requests to map/unmap pages.
> However this approach is really slow in really fast hardware so
> it is better to be moved to the real mode.
> 
> The patch adds an API to increment/decrement page counter as
> get_user_pages API used for user mode mapping does not work
> in the real mode.
> 
> CONFIG_SPARSEMEM_VMEMMAP and CONFIG_FLATMEN are supported.
> 
> Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>
> Cc: David Gibson <david@...son.dropbear.id.au>
> ---

The names are slightly odd, in that they include "vmemmap_" but exist
and work in the flatmem case as well.  Apart from that...

Reviewed-by: Paul Mackerras <paulus@...ba.org>

Paul.
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