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doc: clarify restrictions to run as non-root

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Since modern kernels don't allow unprivileged processes to read the
pagemaps file, the instructions on running as non-root are out-of-date. Add
a note clarifying that they will only work with earlier kernel versions.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: John McNamara <john.mcnamara@intel.com>
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Bruce Richardson 2017-08-04 13:44:09 +01:00 committed by Thomas Monjalon
parent 15034c20e1
commit 0bc99caf5e
1 changed files with 8 additions and 0 deletions
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doc/guides/linux_gsg/enable_func.rst
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@ -87,6 +87,14 @@ The application can then determine what action to take, if any, if the HPET is n
Running DPDK Applications Without Root Privileges
--------------------------------------------------------
.. note::
The instructions below will allow running DPDK as non-root with older
Linux kernel versions. However, since version 4.0, the kernel does not allow
unprivileged processes to read the physical address information from
the pagemaps file, making it impossible for those processes to use HW
devices which require physical addresses
Although applications using the DPDK use network ports and other hardware resources directly,
with a number of small permission adjustments it is possible to run these applications as a user other than "root".
To do so, the ownership, or permissions, on the following Linux file system objects should be adjusted to ensure that