Bug 358591 – Missing TLB flush with SVM ASIDs

Bug 358591 - Missing TLB flush with SVM ASIDs

Summary:	Missing TLB flush with SVM ASIDs

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 5
Classification:	Red Hat
Component:	kernel-xen (Show other bugs)
Sub Component:
Version:	5.1
Hardware:	x86_64 Linux

Priority	low Severity low
Target Milestone:	---
Target Release:	---
Assigned To:	Xen Maintainance List
QA Contact:	Martin Jenner
Docs Contact:

URL:	http://lists.xensource.com/archives/h...
Whiteboard:
Keywords:

Depends On:	318891
Blocks:
	Show dependency tree / graph

Reported:	2007-10-30 13:06 EDT by Markus Armbruster
Modified:	2008-05-21 10:59 EDT (History)
CC List:	0 users

See Also:
Fixed In Version:	RHBA-2008-0314
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2008-05-21 10:59:35 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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Description Markus Armbruster 2007-10-30 13:06:17 EDT

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 03:55:03 EDT

Fixed in xen-3.1-testing.hg cset 15491:3ce0fb37cf59

Comment 2 Bill Burns 2008-01-03 09:11:11 EST

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 11:34:47 EST

You can download this test kernel from http://people.redhat.com/dzickus/el5

Comment 6 errata-xmlrpc 2008-05-21 10:59:35 EDT

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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