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Bug 1582490

Summary:	Running VMs with IBRS CPU fail to migrate after adding SSBD CPUs
Product:	Red Hat Enterprise Virtualization Manager	Reporter:	Michal Skrivanek <michal.skrivanek>
Component:	ovirt-engine	Assignee:	Michal Skrivanek <michal.skrivanek>
Status:	CLOSED ERRATA	QA Contact:	Israel Pinto <ipinto>
Severity:	urgent	Docs Contact:
Priority:	urgent
Version:	4.2.3	CC:	lsurette, mavital, rbalakri, Rhev-m-bugs, rik.theys, srevivo, trichard, ykaul
Target Milestone:	ovirt-3.6.13	Keywords:	Rebase, Regression, ZStream
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	This release fixes a regression from a previous update that caused a live migration of a virtual machine using one of the IBRS CPU types to fail.	Story Points:	---
Clone Of:	1582483	Environment:
Last Closed:	2018-05-30 15:20:19 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	Virt	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1582483
Bug Blocks:

Description Michal Skrivanek 2018-05-25 12:03:42 UTC

+++ This bug was initially created as a clone of Bug #1582483 +++

CPU-Level filter of the default scheduling policy breaks after the recent update which added SSBD variants of CPUs. Because the code was changed to use libvirt CPU flags directly it fails on comparing that with what the VM was started with.

This affects all running VMs using -IBRS CPU Type which were started before this update (<4.2.3.6).

WA is to copy the current scheduling policy, edit, remove CPU-Level filter and set it for the affected Cluster. Host being Operational provides enough safety for migration.

Comment 2 Sandro Bonazzola 2018-05-25 12:46:43 UTC

Originally reported by Rik Theys (rtheys) on #ovirt IRC channel on May 25th 2018

Comment 4 Israel Pinto 2018-05-29 21:09:02 UTC

Steps:
On old version
1. Install 2 host with IBRS CPU 
2. Start VM on one host
3. Check CPU model on VM  
From VM: cat /proc/cpuinfo:
         model name	: Intel Xeon E312xx (Sandy Bridge, IBRS update)
4. Upgrade to: 3.6.13.5-0.1 (rhv-release-3.6.13-8-001.noarch)
 1. Running VM:
    Migrate - PASS
    Maintenance host - PASS
 2. New VM
    Migrate - PASS
    Maintenance host - PASS

Comment 7 errata-xmlrpc 2018-05-30 15:20:19 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:1765

Comment 8 Franta Kust 2019-05-16 13:09:21 UTC

BZ<2>Jira Resync