Re: [PATCH] vfio: don't needlessly setup devices in secondary process

["Burakov, Anatoly" <anatoly.burakov@intel.com>]

On 21-Nov-18 6:41 PM, Darek Stojaczyk wrote:
> Setting up a device that wasn't setup in the primary
> process will possibly break the primary process. That's
> because the IPC message to retrieve the group fd in the
> primary will also *open* that group if it wasn't opened
> before. Even though the secondary process closes that fd
> soon after as a part of its error handling path, the
> primary process leaks it.
> 
> What's worse, opening that fd on the primary will
> increment the process-local counter of opened groups.
> If it was 0 before, then the group will never be added
> to the vfio container, nor dpdk memory will be ever
> mapped.
> 
> This patch moves the proper error checks earlier in the
> code to fuly prevent setting up devices in secondary
> processes that weren't setup in the primary process.
> 
> Fixes: 2f4adfad0a69 ("vfio: add multiprocess support")
> Cc: anatoly.burakov@intel.com
> 
> Signed-off-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
> ---

Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>

-- 
Thanks,
Anatoly