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Bug 1552627

Summary:	[ppc64] Migration will fail after HPT resizing
Product:	Red Hat Enterprise Linux 7	Reporter:	Miroslav Rezanina <mrezanin>
Component:	qemu-kvm-ma	Assignee:	David Gibson <dgibson>
Status:	CLOSED DUPLICATE	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	high	Docs Contact:
Priority:	high
Version:	7.5	CC:	bugproxy, dgibson, hannsj_uhl, jen, jherrman, juzhang, knoel, lmiksik, lvivier, mdeng, micai, michen, mrezanin, mtessun, qzhang, rhodain, salmy, toneata, virt-maint, xianwang
Target Milestone:	rc	Keywords:	Patch
Target Release:	7.6
Hardware:	ppc64le
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	Due to an error in the code for resizing the hashed page table (HPT), migrated guests on an IBM POWER host terminated unexpectedly. This update ensures that the size of the HPT is recorded correctly during migration, which prevents the described crashes from occurring.	Story Points:	---
Clone Of:	1545016	Environment:
Last Closed:	2018-03-08 03:42:03 UTC	Type:	Bug
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:	1545016
Bug Blocks:	1507957, 1513404, 1528344, 1539427, 1550136

Comment 2 Miroslav Rezanina 2018-03-07 13:09:42 UTC

Cloned to get z-stream BZ.

Comment 3 David Gibson 2018-03-07 23:56:40 UTC

Uh.. isn't this a dupe of bug 1550136, itself an existing qemu-kvm-ma dupe of bug 1545016?

Comment 4 David Gibson 2018-03-08 00:24:41 UTC

Actually, this problem probably shouldn't even occur on qemu-kvm-ma, since that doesn't support memory hotplug, which is the use case for HPT resizing.  In theory you can trigger the bug by manually performing a resize, but I'm assuming that's not something we support.