[Qemu-devel] Re: [PATCH] introduce kvm64 CPU

[Amit Shah]

On (Fri) Aug 21 2009 [23:53:41], Andre Przywara wrote:
> Glauber Costa wrote:
>> On Fri, Aug 21, 2009 at 12:41 PM, Avi Kivity<address@hidden> wrote:
>>> On 08/21/2009 12:34 AM, Andre Przywara wrote:
>>>> In addition to the TCG based qemu64 type let's introduce a kvm64 CPU type,
>>>> which is the least common denominator of all KVM-capable x86-CPUs
>>>> (based on Intel Pentium 4 Prescott). It can be used as a base type
>>>> for migration.
>>>>
>>> Typically users will want more specialized greatest common denomiator cpu
>>> types; if a site has standardized on recent hardware they will want the
>>> features of that hardware exposed.
>>>
>>> I think this is best left to management software, which has more information
>>> about the migration pool.
>> I believe what we want is an automatic tool that will connect to a
>> list of machines,and determine which qemu cpu type we should use.
> > Doesn't sound like black magic...
> I already have such a basic tool. It uses ssh (with pubkey) to connect  
> to the target machine, then uses dd on /dev/cpu/0/cpuid to get the CPUID  
> info. This requires cpuid.ko to be loaded and the permissions on the  
> device file to be sufficient (the appropriate udev patch is already  
> upstream). It then computes the least common denominator bits from  
> several machines.

I had such patches as well. I think I sent them on qemu-devel.

When do you plan on sending your patches out?

                Amit