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Bug 711546

Summary:	RHEL6.1 x86_64 HVM guest crashes on AMD host when guest memory size is larger than 8G
Product:	Red Hat Enterprise Linux 6	Reporter:	Benjamin Kahn <bkahn>
Component:	kernel	Assignee:	Frantisek Hrbata <fhrbata>
Status:	CLOSED ERRATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	high	Docs Contact:
Priority:	urgent
Version:	6.1	CC:	dhoward, drjones, imammedo, jwest, jzheng, leiwang, pm-eus, qwan, xen-maint, yuzhang, yuzhou
Target Milestone:	rc	Keywords:	ZStream
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	kernel-2.6.32-131.6.1.el6	Doc Type:	Bug Fix
Doc Text:	Prior to this update, Red Hat Enterprise Linux Xen (up to version 5.6) did not hide 1 GB pages and RDTSCP (enumeration features of CPUID), causing guest soft lock ups on AMD hosts when the guest's memory was greater than 8 GB. With this update, a Red Hat Enterprise Linux 6 HVM (Hardware Virtual Machine) guest is able to run on Red Hat Enterprise Linux Xen 5.6 and lower.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-07-12 21:13:03 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:	703055
Bug Blocks:

Description Benjamin Kahn 2011-06-07 18:34:51 UTC

This bug has been copied from bug #703055 and has been proposed
to be backported to 6.1 z-stream (EUS).

Comment 6 Jinxin Zheng 2011-06-28 04:27:31 UTC

Reproduced on kernel-2.6.32-131.4.1.el6: guest crashes with 16G.

Verified on kernel-2.6.32-131.6.1.el6. Tested 8G, 16G, 32G. All passed.

Comment 7 Martin Prpič 2011-07-12 11:36:33 UTC

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
Prior to this update, Red Hat Enterprise Linux Xen (up to version 5.6) did not hide 1 GB pages and RDTSCP (enumeration features of CPUID), causing guest soft lock ups on AMD hosts when the guest's memory was greater than 8 GB. With this update, a Red Hat Enterprise Linux 6 HVM (Hardware Virtual Machine) guest is able to run on Red Hat Enterprise Linux Xen 5.6 and lower.

Comment 8 errata-xmlrpc 2011-07-12 21:13:03 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 therefore 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/RHSA-2011-0928.html