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

To: "Akio Takebe" <takebe_akio@xxxxxxxxxxxxxx>, "Alex Williamson" <alex.williamson@xxxxxx>, "xen-ia64-devel" <xen-ia64-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-ia64-devel] Time for hybrid virtualization?
From: "Xu, Anthony" <anthony.xu@xxxxxxxxx>
Date: Thu, 17 Jan 2008 21:32:47 +0800
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Thread-topic: [Xen-ia64-devel] Time for hybrid virtualization?
Akio Takebe wrote:
> Hi,
>> Running dom0 on VT mode is feasible, we have proved this.
>> There should be no explicit performance degradation for dom0.
>> While moving dom0 to Vt mode may need great effort, but it is
>> worthwise, It reduces the effort to maintain xenolinux,
>> It's painful, Redhat has complained it.
> Interesting, especially reducing the effort for the maintainance.
> For the performance, we still have some tasks(NUMA, VTd...)
I'm working VT-d for ia64.

> But reducing the maintainance efforts is great.
> Is the reason that VT-dom0 can use the same privilegde operation
> as native kernel?
> We maintain just PV driver and some firmware codes?
We need to maintain more,
We still need to modify linux kernel,
Such as event_callback,  accessing physical device, code sequence 
To check the running environment (native/xen/kvm) ...
Using Vti to emulate priviledged instruction can reduce ~half of the
Late on, we can put some non-performance critical patch into xen.

- Anthony

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