RE: [Xen-ia64-devel] Time for hybrid virtualization?

["Xu, Anthony" <anthony.xu@xxxxxxxxx>]

Isaku Yamahata wrote:
> On Thu, Jan 17, 2008 at 11:06:55AM +0800, Xu, Anthony wrote:
>> If we use hybrid mode, above two issues can be resolved with current
>> method. Hybrid mode is to use VT-I technology to virtualize CPU.
> 
> Interesting. The issue 2 can be easily resolved, I think.
> It would be simply the privcmd device driver.
Yes, privcmd can reserver dom0 physcal address space

> 
> Do you have any idea about the environment detection(native, xen,
> kvm...)? 
We can use CPUID 2,
>From Spec,  SDM 1  3.1.11 Processor Identification register.
It says, CPUID register 2 is an ignored register(reads from this
register return zero).
We can use CPUID 2 to detect environment,
For example,
0   --> native
1   --> xen
2   --> kvm.
...


Anthony




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