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[Xen-bugs] [Bug 1649] New: [RAS] CPU hotplug is not supported in branch

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Subject: [Xen-bugs] [Bug 1649] New: [RAS] CPU hotplug is not supported in branch xen/stable-2.6.32.x
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Date: Fri, 20 Aug 2010 06:29:58 -0700
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           Summary: [RAS] CPU hotplug is not supported in branch xen/stable-
           Product: Xen
           Version: unstable
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: major
          Priority: P1
         Component: HVM
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: yang.z.zhang@xxxxxxxxx

Service Arch (ia32/ia32e/IA64): 
Guest Arch (ia32/ia32e/IA64): 
Guest OS Type (Linux/Windows):
Change Set: xen-hg_xen_unstable_r21925 8992134dcfd0
PVOPS dom0: bracn 2.6.32.x b29254c40dac94960fd3887275c65c83b71086ea
Hardware: NHM-EX

Bug detailed description:
CPU hotplug feature works stable on stable pvops dom0 2.6.31.x branch, but for
2.6.32.x branch, only memory hotplug feature works, cpu hotplug is buggy.

Yunhong suspect that the CPU hotplug support may be not ported to the pvops
kernel's 2.6.32.x.

Reproduce steps:
1. offline the socket 2 and socket 3, remove the memory riser on socket 4
before power on.
2. After Xen boots up, hot-add the memory riser on socket 4, and push the
attention button, then the new added memory was recognized. 
3. trigger the socket 2 and socket 3 CPU jumper to hot-add new CPUs, but we did
not get expected CPU. 

Current result:
CPU entries was not created on dom0 sysfs.

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