Bug 238709

Summary: GATT pages must be uncacheable
Product: Red Hat Enterprise Linux 5 Reporter: Chip Coldwell <coldwell>
Component: kernelAssignee: Chip Coldwell <coldwell>
Status: CLOSED ERRATA QA Contact: Martin Jenner <mjenner>
Severity: high Docs Contact:
Priority: high    
Version: 5.0CC: bnagendr, kernel-mgr, tao
Target Milestone: ---   
Target Release: ---   
Hardware: athlon   
OS: Linux   
Whiteboard:
Fixed In Version: RHBA-2007-0959 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2007-11-07 19:48:38 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:
Attachments:
Description Flags
upstream patch
none
backport of upstream patch to RHEL-5 none

Description Chip Coldwell 2007-05-02 14:30:25 UTC
The pages that store the GART PTEs must be uncacheable.  The penalty for getting
this wrong is data corruption, see RHEL-4 bug 223238.

commit cf6387daf8858bdcb3e123034ca422e8979d73f1
Author: Joachim Deguara <joachim.deguara>
Date:   Tue Apr 24 13:05:36 2007 +0200

    [PATCH] x86-64: make GART PTEs uncacheable
    
    This patches fixes the silent data corruption problems being seen using the
    GART iommu where 4kB of data where incorrect (seen mostly on Nvidia CK804
    systems).  This fix, to mark the memory regin the GART PTEs reside on as
    uncacheable, also brings the code in line with the AGP specification.
    
    Signed-off-by: Joachim Deguara <joachim.deguara>
    Signed-off-by: Andi Kleen <ak>

Comment 1 Chip Coldwell 2007-05-02 14:31:52 UTC
Created attachment 153953 [details]
upstream patch

Comment 2 Chip Coldwell 2007-05-02 14:46:51 UTC
Created attachment 153955 [details]
backport of upstream patch to RHEL-5

Comment 3 Chip Coldwell 2007-05-02 18:54:38 UTC
POSTed 02-May-2007


Comment 4 RHEL Program Management 2007-05-02 21:22:26 UTC
This request was evaluated by Red Hat Kernel Team for inclusion in a Red
Hat Enterprise Linux maintenance release, and has moved to bugzilla 
status POST.

Comment 5 Don Zickus 2007-05-09 18:25:10 UTC
in 2.6.18-18.el5

Comment 7 Mike Gahagan 2007-09-19 18:36:04 UTC
Confirmed the fix is in the -45.el5 kernel

Comment 9 errata-xmlrpc 2007-11-07 19:48:38 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/RHBA-2007-0959.html


Comment 10 Don Zickus 2008-01-24 20:31:59 UTC
*** Bug 247795 has been marked as a duplicate of this bug. ***