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

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Subject: [Xen-bugs] [Bug 1571] New: [RAS] Guost OS hangs when online logic vcpus
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Date: Thu, 28 Jan 2010 23:38:14 -0800
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           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

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

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*
   echo 1 > $c/online

system hang at this moment.

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