[Xen-bugs] [Bug 1571] New: [RAS] Guost OS hangs when online logic vcpus

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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1571

           Summary: [RAS] Guost OS hangs when online logic vcpus
           Product: Xen
           Version: unstable
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Hypervisor
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: jiajun.xu@xxxxxxxxx


Environment:
------------
Service Arch (ia32/ia32e/IA64): 
Guest Arch (ia32/ia32e/IA64): ia32e
Guest OS Type (Linux/Windows):linux 2.6.30
Change Set: 20608:6ead20228b7f
Hardware: 
Other:


Bug detailed description:
--------------------------

hot-add vcpu in qemu console, and then We will see a cpu entry in guest OS
/sys/device/system/cpu directory. 

try to enable it with commoand 
echo 1 > /sys/device/system/cpu/cpuXX/online

the logical cpu works if the vcpu number is less than 8. if I I hot-add more
than 8 vcpus, guest hang. 


Reproduce steps:
----------------
1. prepare hvm configure, and set maxvcpus = 16
2. create VM 
3. hot-add all vcpus in qemu console
cpu_set 3 online
cpu_set 4 online
cpu_set 5 online
cpu_set 6 online
...
...
cpu_set 15 online
4. enable each vcpu in guest Os

for c in /sys/devices/system/cpu*
do
   echo 1 > $c/online
done

system hang at this moment.


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