Messages in this thread | | | Date | Fri, 17 Jun 2022 01:44:30 -0700 | From | Christoph Hellwig <> | Subject | Re: [RFT][PATCH v1 5/6] vfio/ccw: Add kmap_local_page() for memcpy |
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On Thu, Jun 16, 2022 at 04:52:11PM -0700, Nicolin Chen wrote: > The pinned PFN list returned from vfio_pin_pages() is simply converted > using page_to_pfn() without protection, so direct access via memcpy() > will crash on S390 if the PFN is an IO PFN. Instead, the pages should > be touched using kmap_local_page().
I don't see how this helps. kmap_local_page only works for either pages in the kernel direct map or highmem, but not for memory that needs to be ioremapped. And there is no highmem on s390.
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