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

[Tristan Gingold <tgingold@xxxxxxx>]

On Thu, Jun 28, 2007 at 02:52:05PM +0200, Dietmar Hahn wrote:
> Hi,
> 
> attached to this mail are 2 patches:
> - opt_feature_xen.patch
>   implements the new hypercall  __HYPERVISOR_opt_feature in the hypervisor.
> - opt_feature_linux.patch
>   implements the usage of the hypercall.
I think the hypercall interface is a little bit overkill but who knows about
the future?

> The xen - patch has real effects in vcpu_translate() on inserting identity 
> mappings in the vhpt/tlb. I'am not sure about some performance impacts.
> But without such a patch correct future protection key handling is impossible.
I don't understand why.  Isn't PK 0 supposed to be always enabled ?
(But I think it should be possible to disable the auto id mapping insertion).

Tristan.

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