Bug 250497

Summary: eHCA infiniband adapter works only for IPoIB
Product: Red Hat Enterprise Linux 5 Reporter: Scott Moser <smoser>
Component: openibAssignee: Doug Ledford <dledford>
Status: CLOSED ERRATA QA Contact:
Severity: urgent Docs Contact:
Priority: urgent    
Version: 5.1CC: tao
Target Milestone: ---   
Target Release: ---   
Hardware: powerpc   
OS: Linux   
Whiteboard:
Fixed In Version: RHEA-2007-0645 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2007-11-07 17:01:58 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 250144, 250496    
Bug Blocks:    
Attachments:
Description Flags
libehca_user_space_support_for_rhel5.patch none

Description Scott Moser 2007-08-01 22:00:56 UTC 
+++ This bug was initially created as a clone of Bug #250496 +++

Description of problem:

The eHCA driver has a problem with mapping userspace resources.  It's nicely
explained in the upstream git submission:
Some drivers have resources that they want to be able to map into
userspace that are 4k in size. On a kernel configured with 64k pages
we currently end up mapping the 4k we want plus another 60k of
physical address space, which could contain anything.  This can
introduce security problems, for example in the case of an infiniband
adaptor where the other 60k could contain registers that some other
program is using for its communications.

This is present in kernel-2.6.18-36.el5

Without these changes the eHEA driver will only function in IPoIB (IP over
Infiniband).  User space applications will fail to run (for example MPI). Its
primary value is thus not usable.

-- Additional comment from smoser on 2007-08-01 17:58 EST --
Created an attachment (id=160469)
ib_ehca_user_space_support_for_rhel5.patch
Comment 1 Scott Moser 2007-08-01 22:00:57 UTC 
Created attachment 160470 [details]
libehca_user_space_support_for_rhel5.patch
Comment 7 errata-xmlrpc 2007-11-07 17:01:58 UTC 
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHEA-2007-0645.html