Messages in this thread | | | Subject | Re: [PATCH v2 6/6] powerpc/pseries/iommu: Avoid errors when DDW starts at 0x00 | From | Alexey Kardashevskiy <> | Date | Wed, 1 Jul 2020 18:04:41 +1000 |
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On 27/06/2020 03:46, Leonardo Bras wrote: > On Wed, 2020-06-24 at 03:24 -0300, Leonardo Bras wrote: >> As of today, enable_ddw() will return a non-null DMA address if the >> created DDW maps the whole partition. If the address is valid, >> iommu_bypass_supported_pSeriesLP() will consider iommu bypass enabled. >> >> This can cause some trouble if the DDW happens to start at 0x00. >> >> Instead if checking if the address is non-null, check directly if >> the DDW maps the whole partition, so it can bypass iommu. >> >> Signed-off-by: Leonardo Bras <leobras.c@gmail.com> > > This patch has a bug in it. I will rework it soon.
I'd rather suggest this:
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/20180725095032.2196-2-aik@ozlabs.ru/
Although it does not look like you are actually going to have windows starting at 0. Thanks,
> Please keep reviewing patches 1-5. > > Best regards, > Leonardo >
-- Alexey
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