From: Paul Mackerras <paulus@samba.org>
To: aik@ozlabs.ru
Cc: Alexander Graf <agraf@suse.de>,
Michael Ellerman <michael@ellerman.id.au>,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
kvm-ppc@vger.kernel.org, kvm@vger.kernel.org,
David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [PATCH 3/4] powerpc: preparing to support real mode optimization
Date: Fri, 15 Feb 2013 14:37:40 +1100 [thread overview]
Message-ID: <20130215033740.GC25015@drongo> (raw)
In-Reply-To: <5118e069.22ca320a.1f08.ffffe2f0@mx.google.com>
On Mon, Feb 11, 2013 at 11:12:42PM +1100, aik@ozlabs.ru wrote:
> From: Alexey Kardashevskiy <aik@ozlabs.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@ozlabs.ru>
> Cc: David Gibson <david@gibson.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@samba.org>
Paul.
next prev parent reply other threads:[~2013-02-15 3:54 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1360584763-21988-1-git-send-email-a>
2013-02-11 12:12 ` [PATCH 1/4] powerpc: lookup_linux_pte has been made public aik
2013-02-15 3:13 ` Paul Mackerras
2013-02-11 12:12 ` [PATCH 2/4] powerpc kvm: added multiple TCEs requests support aik
2013-02-15 3:24 ` Paul Mackerras
2013-02-18 8:14 ` Alexey Kardashevskiy
2013-02-11 12:12 ` [PATCH 3/4] powerpc: preparing to support real mode optimization aik
2013-02-15 3:37 ` Paul Mackerras [this message]
2013-02-11 12:12 ` [PATCH 4/4] vfio powerpc: added real mode support aik
2013-02-15 3:54 ` Paul Mackerras
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