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Re: [Xen-ia64-devel] [PATCH][RESEND]: clear the key part of cr.itir


  • To: "Xu, Anthony" <anthony.xu@xxxxxxxxx>, Alex Williamson <alex.williamson@xxxxxx>
  • From: Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxxxxxxx>
  • Date: Mon, 9 Jul 2007 08:09:28 +0200
  • Cc: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Sun, 08 Jul 2007 23:07:10 -0700
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  • List-id: Discussion of the ia64 port of Xen <xen-ia64-devel.lists.xensource.com>

Am Donnerstag, 5. Juli 2007 schrieb Xu, Anthony:
> ...
> You mentioned this is in preparation of using protection keys.
> Could you share your idea of virtualizing protection keys?
> And which ia64 OS use protection keys?

As mentioned before we do a PV port of a (not open source) mainframe os to xen 
and this os is using protection keys. So protection key support in xen is 
necessary. 
A short discussion to the protection key support was on the list:
http://lists.xensource.com/archives/html/xen-ia64-devel/2007-04/msg00129.html
I did a first implementation for PV guests with 1 pkr reserved for the 
hypervisor. I'll send a RFC and a first patch within the next days.
Thanks.

Dietmar.

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