[dpdk-stable] [PATCH v8 1/3] vfio: revert changes for map contiguous areas in one go

[David Marchand]

On Fri, Jan 15, 2021 at 8:33 AM Nithin Dabilpuram
<ndabilpuram at marvell.com> wrote:
>
> In order to save DMA entries limited by kernel both for externel
> memory and hugepage memory, an attempt was made to map physically
> contiguous memory in one go. This cannot be done as VFIO IOMMU type1
> does not support partially unmapping a previously mapped memory
> region while Heap can request for multi page mapping and
> partial unmapping.
> Hence for going back to old method of mapping/unmapping at
> memseg granularity, this commit reverts
> commit d1c7c0cdf7ba ("vfio: map contiguous areas in one go")
>
> Also add documentation on what module parameter needs to be used
> to increase the per-container dma map limit for VFIO.
>
> Fixes: d1c7c0cdf7ba ("vfio: map contiguous areas in one go")
> Cc: anatoly.burakov at intel.com
> Cc: stable at dpdk.org
>
> Signed-off-by: Nithin Dabilpuram <ndabilpuram at marvell.com>
> Acked-by: Anatoly Burakov <anatoly.burakov at intel.com>
> Acked-by: David Christensen <drc at linux.vnet.ibm.com>

There is a regression reported in bz: https://bugs.dpdk.org/show_bug.cgi?id=649

I assigned it to Anatoly for now.
Nithin, can you have a loo too?

Thanks.


-- 
David Marchand