From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bruce Richardson Subject: [PATCH 1/3] doc: clarify documentation on running as non-root Date: Fri, 4 Aug 2017 13:44:09 +0100 Message-ID: <20170804124411.238646-2-bruce.richardson@intel.com> References: <20170804124411.238646-1-bruce.richardson@intel.com> Cc: dev@dpdk.org, Bruce Richardson To: john.mcnamara@intel.com Return-path: Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by dpdk.org (Postfix) with ESMTP id 48965330D for ; Fri, 4 Aug 2017 15:32:16 +0200 (CEST) In-Reply-To: <20170804124411.238646-1-bruce.richardson@intel.com> List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" 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kernels don't allow unprivileged processes to read the pagemaps file, the instructions on running as non-root are out-of-date.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 --- doc/guides/linux_gsg/enable_func.rst | 8 ++++++++ 1 file changed, 8 insertions(+) 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 -- 2.13.3