diff mbox

[dpdk-dev,1/3] doc: clarify documentation on running as non-root

Message ID 20170804124411.238646-2-bruce.richardson@intel.com (mailing list archive)
State Accepted, archived
Headers

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/Intel-compilation success Compilation OK

Commit Message

Bruce Richardson Aug. 4, 2017, 12:44 p.m. UTC 
  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pagemaps file, the instructions on running as non-root are out-of-date.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>
---
 doc/guides/linux_gsg/enable_func.rst | 8 ++++++++
 1 file changed, 8 insertions(+)

Comments

John McNamara Aug. 4, 2017, 1:39 p.m. UTC | #1 
> -----Original Message-----
> From: Richardson, Bruce
> Sent: Friday, August 4, 2017 1:44 PM
> To: Mcnamara, John <john.mcnamara@intel.com>
> Cc: dev@dpdk.org; Richardson, Bruce <bruce.richardson@intel.com>
> Subject: [PATCH 1/3] doc: clarify documentation on running as non-root
> 
> 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 pagemaps file, the instructions on running as non-root are out-of-date.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>
diff mbox

Patch

diff --git a/doc/guides/linux_gsg/enable_func.rst b/doc/guides/linux_gsg/enable_func.rst
index e6c806b0d..5ac0184a1 100644
--- a/doc/guides/linux_gsg/enable_func.rst
+++ b/doc/guides/linux_gsg/enable_func.rst
@@ -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