Re: [Xen-devel] Redhat 6 VM crash on Xen when cpu number reaches 64

[Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>]

"Ouyang Zhaowei (Charles)" <ouyangzhaowei@xxxxxxxxxx> writes:

> Hi all:
>
> Now a days, we tested Redhat 6.2(6.4) on Xen(version 4.1.2).
> If we config the cpu number more than 32, it'll show 32 in
> the VM, and if we config it 64 cpus, the VM will crash and
> the log is list below.
>
> Can someone tell us why is this happening?

Old RHEL6 kernels don't have support for VCPU info placement for PVHVM
(VCPUOP_register_vcpu_info call) so only 32 VCPUs are supported. This is
fixed in current 6.6.z kernel.

>
> thanks
>
> ===============================crash log=================================
> CPU: CPU feature rdtscp disabled on xen guest
> CPU: CPU feature constant_tsc disabled on xen guest
> mce: CPU supports 0 MCE banks
>  #32
> CPU32: Stuck ??
>  #33
> CPU33: Stuck ??

...

-- 
  Vitaly

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