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@xxxxxxxxxxxxxxxxxx> > > Reviewed-by: Gavin Shan <gwshan@xxxxxxxxxxxxxxxxxx> > > --- > > 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 > > > _______________________________________________ > Linuxppc-dev mailing list > Linuxppc-dev@xxxxxxxxxxxxxxxx > https://lists.ozlabs.org/listinfo/linuxppc-dev -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
