[PATCH resend] powernv/iommu: disable IOMMU bypass with param iommu=nobypass

[cascardo at linux.vnet.ibm.com]

On Thu, Jan 22, 2015 at 12:05:31PM +1100, Michael Ellerman wrote:
> On Wed, 2015-01-21 at 13:23 -0200, Thadeu Lima de Souza Cascardo wrote:
> > When IOMMU bypass is enabled, a PCI device can read and write memory
> > that was not mapped by the driver without causing an EEH. That might
> > cause memory corruption, for example.
> > 
> > When we disable bypass, DMA reads and writes to addresses not mapped by
> > the IOMMU will cause an EEH, allowing us to debug such issues.
> > 
> > Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo at linux.vnet.ibm.com>
> > Reviewed-by: Gavin Shan <gwshan at linux.vnet.ibm.com>
> > ---
> >  Documentation/kernel-parameters.txt       |    2 ++
> >  arch/powerpc/platforms/powernv/pci-ioda.c |   24 +++++++++++++++++++++++-
> >  2 files changed, 25 insertions(+), 1 deletion(-)
> 
> Is this unchanged since v2?
> 

Yes, it's unchanged, just rebased.

Cascardo.

> It's marked as under review in patchwork which means I'm looking at it:
> 
>   http://patchwork.ozlabs.org/patch/402682/
> 
> 
> Please check patchwork in future.
> 
> cheers
> 
> 
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