[dpdk-dev] [PATCH v2 1/1] vfio: add page-by-page mapping API

[David Marchand]

Hello Anatoly,

On Tue, Nov 2, 2021 at 4:54 PM Burakov, Anatoly
<anatoly.burakov at intel.com> wrote:
>
> On 28-Oct-21 3:09 PM, Anatoly Burakov wrote:
> > Currently, there is no way to map memory for DMA in a way that allows
> > unmapping it partially later, because some IOMMU's do not support
> > partial unmapping. There is a workaround of mapping all of these
> > segments separately, but this is inconvenient and silly, so this
> > commit adds a proper API that does it.
> >
> > This commit relies on earlier infrastructure that was built out to
> > support "chunking", as the concept of "chunks" is essentially the same
> > as page size.
> >
> > Signed-off-by: Anatoly Burakov <anatoly.burakov at intel.com>
> > ---
> >
> > Notes:
> >      v2:
> >      - Added checks for page alignment of supplied values
> >      - Added rte_errno values (similar to patch 103165 [1])
> >
> >      [1] http://patches.dpdk.org/project/dpdk/patch/e8c5e7ba089e2283c3cd67e4529e52fe49390eb9.1635428963.git.anatoly.burakov@intel.com/
>
> I think this API also needs VA and IOVA addresses in an array, so that
> it's possible to map IOVA-discontiguous segments. This is too late for
> this release, so let's postpone it till 22.02.

It seems this patch fell through the cracks.
Any update?

Thanks.

-- 
David Marchand