[dpdk-dev] [PATCH 2/3] lib/eal: fix vfio unmap that succeeds unexpectedly

Burakov, Anatoly anatoly.burakov at intel.com
Wed Aug 21 15:24:03 CEST 2019

On 21-Aug-19 2:02 PM, Chaitanya Babu Talluri wrote:
> Un-map of page with valid virtual address and
> another page's IOVA succeeds unexpectedly.
> An entry in user_mem_maps can refer multiple pages.
> Currently in such case to unmap single page, VA
> and IOVA related to entry in user_mem_maps is
> checked but not based on page (based on the
> page size), this is the cause.
> The solution is that in find_user_mem_maps,
> check whether user input iova is in relation with
> input virtual address of the page which is to be
> unmapped.

The description could be clearer. Suggested rewording:

Unmapping page with a VA that is found in the list of current mappings 
will succeed even if the IOVA for the chunk that is being unmapped, is 
mismatched. Fix it by checking if IOVA address matches the expected IOVA 
address exactly.


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