Bug 570056 – hvm guest will always restart when VCPU bound to specific CPU

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Bug 570056 - hvm guest will always restart when VCPU bound to specific CPU

Summary:	hvm guest will always restart when VCPU bound to specific CPU

Status:	CLOSED DUPLICATE of bug 541840

Aliases:	None

Product:	Red Hat Enterprise Linux 5
Classification:	Red Hat
Component:	kernel-xen (Show other bugs)
Sub Component:
Version:	5.5
Hardware:	All Linux

Priority	low Severity medium
Target Milestone:	rc
Target Release:	---
Assigned To:	Xen Maintainance List
QA Contact:	Red Hat Kernel QE team
Docs Contact:

URL:
Whiteboard:
Keywords:

Depends On:
Blocks:	5.5_Known-Issues
	Show dependency tree / graph

Reported:	2010-03-03 00:32 EST by Yewei Shao
Modified:	2011-07-14 04:03 EDT (History)
CC List:	7 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2010-06-25 07:38:11 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
The config file (519 bytes, application/octet-stream) 2010-03-03 00:35 EST, Yewei Shao	no flags	Details
dmesg (776 bytes, application/octet-stream) 2010-03-03 00:35 EST, Yewei Shao	no flags	Details
Bug earlyprink screenshot (52.64 KB, image/jpeg) 2010-03-11 04:40 EST, Miroslav Rezanina	no flags	Details
Add an attachment (proposed patch, testcase, etc.)

Groups: None (edit)

Description Yewei Shao 2010-03-03 00:32:39 EST

Description of problem:
When bind VCPU to specific CPU (via cpus parameter (cpus = "0") in config
file), the hvm guest will always restart automatically and can not boot up successfully. Please use the config file that in attachment to reproduce the bug.

Version-Release number of selected component (if applicable):
xen-3.0.3-105.el5

How reproducible:
Always

Steps to Reproduce:
1.Start a guest with cpus="0":
   # xm cr $guest cpus="0" vcpus=4
2.
3.
  
Actual results:
The guest will always restart automatically and can not boot up successfully.

Expected results:
The guest should boot up successfully.

Additional info:

Comment 1 Yewei Shao 2010-03-03 00:35:02 EST

Created attachment 397475 [details]
The config file

Comment 2 Yewei Shao 2010-03-03 00:35:22 EST

Created attachment 397476 [details]
dmesg

Comment 4 Miroslav Rezanina 2010-03-11 04:39:21 EST

This is kernel bz. There's similiar bug filled against pv guest - bz #541840. 

CPU's binding is passed to guest correctly. It works for single vcpu on single cpu or multiple vcpus on multiple cpus. I will attach screenshot of earlyprints.

Reassign to kernel-xen

Comment 5 Miroslav Rezanina 2010-03-11 04:40:46 EST

Created attachment 399298 [details]
Bug earlyprink screenshot

Comment 6 Andrew Jones 2010-03-11 09:07:46 EST

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:
Xen guests will not boot with a configuration that binds multiple vcpus to a single cpu.

Comment 8 Ryan Lerch 2010-03-22 23:41:36 EDT

Technical note updated. If any revisions are required, please edit the "Technical Notes" field
accordingly. All revisions will be proofread by the Engineering Content Services team.

Diffed Contents:
@@ -1 +1 @@
-Xen guests will not boot with a configuration that binds multiple vcpus to a single cpu.+Xen guests will not boot using configurations that bind multiple virtualized CPUs to a single CPU.

Comment 9 Paolo Bonzini 2010-06-02 09:23:49 EDT

If we want to forbid this configuration, this can simply be a dup of bug 541840.

Comment 10 Paolo Bonzini 2010-06-25 07:38:11 EDT

Since this is what we're doing in bug 541840 (and it makes no sense to forbid PV but allow HVM), marking as dup.

*** This bug has been marked as a duplicate of bug 541840 ***

Comment 11 Paolo Bonzini 2011-07-14 04:03:20 EDT

The duplicate bug was fixed, removing technical notes.

Comment 12 Paolo Bonzini 2011-07-14 04:03:20 EDT

Deleted Technical Notes Contents.

Old Contents:
Xen guests will not boot using configurations that bind multiple virtualized CPUs to a single CPU.

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