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[Xen-bugs] [Bug 1638] New: vcpu cannot be hot added again after hot remo

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Subject: [Xen-bugs] [Bug 1638] New: vcpu cannot be hot added again after hot removed
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Date: Tue, 27 Jul 2010 03:01:00 -0700
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           Summary: vcpu cannot be hot added again after hot removed
           Product: Xen
           Version: unstable
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Hypervisor
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: yang.z.zhang@xxxxxxxxx

Service Arch (ia32/ia32e/IA64):32e 
Guest Arch (ia32/ia32e/IA64):32e 
Guest OS Type (Linux/Windows):Linux
Change Set:  21492:96917cf25bf3
xen-changeset:   21492:96917cf25bf3

pvops git:
commit e4612f9768065b6692dee07af26a7511e936e099
Merge: a3e7c7b... 7ec9d1e...
Author: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>

ioemu git:
commit ffb0cf2ad55e952dae55e6166c4fcea79be6cd30
Author: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Date:   Thu Apr 15 17:01:15 2010 +0100

Bug detailed description:
the same vcpu after hot removed cannot be hot added again.

Reproduce steps:
1.start a HVM
2.xm vcpu-set id cpu_nr
3.echo 1 > /sys/devices/system/cpu/cpu_id/online  
4.remove it: xm vcpu-set id cpu_nr
5.echo 1 > /sys/devices/LNXSYSTM:00/LNXSYBUS:00/LNXCPU:cpu_id/eject
6.then add it again: xm vcpu-set id cpu_nr. it does not work.

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