Re: [Xen-ia64-devel] Question: Special linux dom0 handling in vcpu_translate()

[tgingold@xxxxxxx]

Quoting Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxxxxxxx>:

> Hi,
>
> in vcpu_translate I found some lines of code which seems to be an
> optimization
> for the linux dom0:
...
> I found this, because mini-os uses the same scheme. Now the hypervisor does
> the itc for mini-os with a linux kernel identity mapped pte!
> In general this may leads to problems if other systems with similar region
> scheme are running on xen.
> In particular I have here the problem that using protection keys for such
> addresses is impossible!
> Is it possible to do this optimization for the linux kernel another way?

I think this special linux optimization should be enabled by the OS. We should
add an hypercall (or a SAL call) for this.

Tristan.

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