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[Xen-bugs] [Bug 1570] New: [RAS] Can not initiliaze CPU entries in guest

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Subject: [Xen-bugs] [Bug 1570] New: [RAS] Can not initiliaze CPU entries in guest OS against linux 2.6.32
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Date: Thu, 28 Jan 2010 23:37:21 -0800
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           Summary: [RAS] Can not initiliaze CPU entries in guest OS against
                    linux 2.6.32
           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 2.6.32
Change Set: 20608:6ead20228b7f

Bug detailed description:

vcpu hot-add works with linux 2.6.30, but with the same configuration, it is
buggy against kernel 2.6.32. 

After we hot-add in qemu console with command:
cpu_set 4 online

I can see that Guest OS already receive the SCI interrupt, the interrupts
number increased after we hot-add a vcpu, but when you check the new cpu
entries in sysfs, No new CPU entries was created.

Check the CPU information with acpidump, we can see the new CPU status is
enabled after we hot-add it in qemu.

check the dmesg in guest OS, there is no any debug information from function
acpi_processor_hotplug_notify, I suspect that it is not be called indeed, it
should has problem to trigger this function. 

Linux 2.6.32 is a related stable version for cpu hot-add in native linux, CPU
physical online works fine on NHM-EX ER and NHM-EX SR.

Need to dig out why it does not work with 2.6.32 kernel.

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