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Bug 1098101 - the "CPU Affinity" info of guest vcpuinfo can't be shown timely
Summary: the "CPU Affinity" info of guest vcpuinfo can't be shown timely
Keywords:
Status: CLOSED DUPLICATE of bug 838070
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: libvirt
Version: 6.6
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: rc
: ---
Assignee: Libvirt Maintainers
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks: 1098106
TreeView+ depends on / blocked
 
Reported: 2014-05-15 10:04 UTC by Xuesong Zhang
Modified: 2014-05-16 08:02 UTC (History)
5 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
: 1098106 (view as bug list)
Environment:
Last Closed: 2014-05-16 08:02:37 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Xuesong Zhang 2014-05-15 10:04:09 UTC 
Description:
Disable one host cpu, then enabled it back. Then it can't be shown in the output of the guest vcpuinfo.
Even restart the guest and libvirtd, the "CPU Affinity" info is still not correct.
Waiting for half day, the "CPU Affinity" info is still not correct.
The only resolved method is to reboot the host, then the "CPU Affinity" info will be correctly.

How reproducible:
100%

Version:
libvirt-0.10.2-35.el6.x86_64
qemu-kvm-rhev-0.12.1.2-2.425.el6.x86_64
kernel-2.6.32-463.el6.x86_64

Steps:
１．　prepare one running guest, and check the vcpuinfo of this guest.
# virsh start rhel6.5
Domain rhel6.5 started

# virsh vcpuinfo rhel6.5
VCPU:           0
CPU:            0
State:          running
CPU time:       4.9s
CPU Affinity:   yyyy

2. check the online cpus of this host.
# cat /sys/devices/system/cpu/online 
0-3

3. disable one cpu of the host.
# echo 0 > /sys/devices/system/cpu/cpu2/online 
# cat /sys/devices/system/cpu/cpu2/online 
0
# cat /sys/devices/system/cpu/online 
0-1,3

4. check the vcpuinfo of the guest.
# virsh vcpuinfo rhel6.5
VCPU:           0
CPU:            0
State:          running
CPU time:       33.7s
CPU Affinity:   yy-y


5. enable the 2nd cpu on host.
# echo 1 > /sys/devices/system/cpu/cpu2/online 
# cat /sys/devices/system/cpu/cpu2/online 
1
# cat /sys/devices/system/cpu/online 
0-3

6. check the vcpuinfo of the guest again
# virsh vcpuinfo rhel6.5
VCPU:           0
CPU:            1
State:          running
CPU time:       32.8s
CPU Affinity:   yy-y


7. destroy and start the guest, then, check vcpuinfo again.
# virsh destroy rhel6.5
Domain rhel6.5 destroyed

# virsh start rhel6.5
Domain rhel6.5 started

# virsh vcpuinfo rhel6.5
VCPU:           0
CPU:            0
State:          running
CPU time:       2.5s
CPU Affinity:   yy-y


8. restart libvirtd and recheck.
# service libvirtd restart
Stopping libvirtd daemon:                                  [  OK  ]
Starting libvirtd daemon:                                  [  OK  ]

# virsh destroy rhel6.5
Domain rhel6.5 destroyed

# virsh start rhel6.5
Domain rhel6.5 started

# virsh vcpuinfo rhel6.5
VCPU:           0
CPU:            0
State:          running
CPU time:       0.5s
CPU Affinity:   yy-y



Actual results:
As step 6, 7 and 8

Expected results:
The CPU Affinity should be show the active pinned cpu after the cpu is enabled.
Comment 1 Jiri Denemark 2014-05-16 08:02:37 UTC 
I think the core issue is the same as in bug 838070.

*** This bug has been marked as a duplicate of bug 838070 ***
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