Bug 451170

Summary:	F-10 pv_ops xen: Add x86_64 SMP support
Product:	[Fedora] Fedora	Reporter:	Holger Schmitt <holger.schmitt>
Component:	kernel-xen	Assignee:	Eduardo Habkost <ehabkost>
Status:	CLOSED RAWHIDE	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	medium	Docs Contact:
Priority:	low
Version:	9	CC:	ondrejj, xen-maint
Target Milestone:	---
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2008-07-21 15:41:30 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:
Bug Blocks:	442569

Description Holger Schmitt 2008-06-13 07:06:39 UTC

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9b5) Gecko/2008042803 Red Hat/3.0b5-0.beta5.6.el5 Firefox/3.0b5

Description of problem:
I try to run Fedora 9 x86_64 paravirtualized on RedHat EL 5 x86_64 on Dell 2950. CPU: Intel Quadcore, RAM: 8GB, Disk: RAID5

While installation and running Fedora detects only one CPU although more than one VCPU is set in the according xen-config file.

"cat /proc/cpuinfo" shows only one CPU in guest system.

xen-config (/etc/xen/fedora) on host system:
name = "fedora"
uuid = "02a35f2f-8f4f-c8d2-c8f5-1fea42ae0132"
maxmem = 512
memory = 512
vcpus = 4
bootloader = "/usr/bin/pygrub"
on_poweroff = "destroy"
on_reboot = "restart"
on_crash = "restart"
vfb = [ "type=vnc,vncunused=1,keymap=de" ]
disk = [ "phy:/dev/sda7,xvda,w" ]
vif = [ "mac=00:16:3e:11:f8:d3,bridge=xenbr0" ]


Fedora 8 x8_64 detects 4 CPUs with the same configuration.


Version-Release number of selected component (if applicable):


How reproducible:
Always


Steps to Reproduce:
1. Install RedHat EL 5 x86_64 as host
2. Config paravirtualized guest machine via virtual machine manager, with 4 VCPUs
3. Install Fedora 9 x86_64 from network source
4. Within installation switch to console and type in "cat /proc/cpuinfo"
or
5. Install Fedora and after that type in "cat /proc/cpuinfo"


Actual Results:
- Only 1 CPU is detected by Fedora
- The CPU settings for this guest is automatically reset to 1 CPU in "Virtual machine manager" when Fedora guest starts

- Paravirtualized Fedora 8 detects 4 CPUs as expected


Expected Results:
According to xen-config file more than one CPU has to be detected by Fedora

Additional info:

Comment 1 Mark McLoughlin 2008-07-01 07:35:57 UTC

Yep, x86_64 xen DomU doesn't currently have SMP support - see also bug #437947

Comment 2 Mark McLoughlin 2008-07-21 15:41:30 UTC

Okay, with kernel-xen-2.6.27-0.2.rc0.git6.fc10.x86_64 we have SMP support again

$> uname -r
2.6.27-0.2.rc0.git6.fc10.x86_64.xen.x86_64
$> cat /proc/cpuinfo | grep processor
processor       : 0
processor       : 1

Comment 3 Mark McLoughlin 2008-09-09 14:33:01 UTC

*** Bug 460292 has been marked as a duplicate of this bug. ***