Re: [Xen-users] Live Migration between different CPUs, cpuid

[James Pifer <jep@xxxxxxxxxxxxxxxx>]

On 10/29/2013 10:47 AM, Michael Fischer wrote:

Hi!

 

I'm trying to accomplish live migration between two dom0s with different CPUs (Intel(R) Xeon(R) CPU E5-2430 and Intel(R) Xeon(R) CPU E5620).

 

As indicated here (http://zhigang.org/wiki/XenCPUID) you can mask cpu features for domUs with the cpuid directive. But I don't seem to get my directives right - to be frank I don't know how to interpret the following output of cpuid:

 

....... 

 

Can anybody point out to me what I should set as cpuid=[ '' ] in my domU config?

 

Thanks in advance, Mike

Mike,

You can try the cpuid codes that work in most cases for us. It was a lot of work to get to these, with the help of our vendor. I kind of understand some of it, but not all of it.

I like having them in different formats like this so it's easy to determine which one I'm using. (full vs para virt)

For FV/HVM VMs:
cpuid=['1:ecx=0x009CE3BD,edx=0xBFEBFBFF','0x80000001:ecx=0x00000001,edx=0x28100800']

For PV VMs:
cpuid=['0x0000000D:eax=00000000000000000000000000000000,ebx=00000000000000000000000000000000,ecx=00000000000000000000000000000000,edx=00000000000000000000000000000000','0x00000001:eax=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx,ebx=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx,ecx=10000000100111000010001000100001,edx=00011111110010011000101101110101']

I don't have one working for Windows 2012 yet.

Also, not sure what flavor of xen you're running, but we use SLES11/xen and had to have some xen patches for this to work for us. Before the patches, it would start to migrate and you could see it paused on the destination, but then it would disappear.

HTH,
James

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