[PATCH 3/4] powerpc: preparing to support real mode optimization
Paul Mackerras
paulus at samba.org
Fri Feb 15 14:37:40 EST 2013
On Mon, Feb 11, 2013 at 11:12:42PM +1100, aik at ozlabs.ru wrote:
> From: Alexey Kardashevskiy <aik at 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 at ozlabs.ru>
> Cc: David Gibson <david at 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 at samba.org>
Paul.
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