RE: [Xen-ia64-devel] [RFC][PATCH] [RESEND] support special guest optimisations in the hypervisor

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

>
>I'am not sure I understand you right. So let us clarify that.
>As far as I understand Alex right, the idea was to use the opt_feature
stuff
>in the HVM too. But the invocation is done in set_os_type(). There the
>function domain_opt_feature() is called to switch on the special
>region-4/region-5 identity mapping opt_feature if the guest is windows.
>Therewith the hypervisor knows and uses only opt_features to switch
on/off
>special optimization features for special guests, the same way on PV or
HVM.
>For this we must extend the opt_feature vector with the
region-4/region-5
>identity mapping.
>On PV the invocation is done via the __HYPERVISOR_opt_feature
hypercall.
>Do I see something wrong here?


I think you can do this way.

A little concern,
For dom0 & domU, pgprot and key are provided by guest, it is natural.
While for HVM , pgprot and key are provided Xen, it is a little strange.

- Anthony

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