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

To: "Isaku Yamahata" <yamahata@xxxxxxxxxxxxx>
Subject: RE: [Xen-ia64-devel] Time for hybrid virtualization?
From: "Xu, Anthony" <anthony.xu@xxxxxxxxx>
Date: Thu, 17 Jan 2008 12:39:48 +0800
Cc: Alex Williamson <alex.williamson@xxxxxx>, xen-ia64-devel <xen-ia64-devel@xxxxxxxxxxxxxxxxxxx>
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Thread-topic: [Xen-ia64-devel] Time for hybrid virtualization?
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.


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