Bug 358591 - Missing TLB flush with SVM ASIDs
Summary: Missing TLB flush with SVM ASIDs
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: kernel-xen
Version: 5.1
Hardware: x86_64
OS: Linux
low
low
Target Milestone: ---
: ---
Assignee: Xen Maintainance List
QA Contact: Martin Jenner
URL: http://lists.xensource.com/archives/h...
Whiteboard:
Depends On: 318891
Blocks:
TreeView+ depends on / blocked
 
Reported: 2007-10-30 17:06 UTC by Markus Armbruster
Modified: 2008-05-21 14:59 UTC (History)
0 users

Fixed In Version: RHBA-2008-0314
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2008-05-21 14:59:35 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2008:0314 0 normal SHIPPED_LIVE Updated kernel packages for Red Hat Enterprise Linux 5.2 2008-05-20 18:43:34 UTC

Description Markus Armbruster 2007-10-30 17:06:17 UTC 
Found on xen-devel (see URL), not sure whether we need it, see URL field for
patch.  Quote from there:

But, with SVM ASIDs, it is possible to:
(1) Update CR3 update,
(2) vmenter the guest, and
(3) and vmexit due to a page fault
all without an intervening host TLB flush.

Then the page fault code could use the linear pagetable
to read a top-level shadow page table entry.

But, without this change, it would fetch the wrong value
due to a stale TLB.
Comment 1 Markus Armbruster 2007-10-31 07:55:03 UTC 
Fixed in xen-3.1-testing.hg cset 15491:3ce0fb37cf59
Comment 2 Bill Burns 2008-01-03 14:11:11 UTC 
This issue was fixed by the rebase to the Xen 3.1.2 Hypervisor and is thus
fixed for RHEL 5.2. Setting flags and state.
Comment 3 Don Zickus 2008-01-24 16:34:47 UTC 
You can download this test kernel from http://people.redhat.com/dzickus/el5
Comment 6 errata-xmlrpc 2008-05-21 14:59:35 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-2008-0314.html
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