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

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

>From: xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx
>[mailto:xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Dietmar Hahn
>Sent: 2007年7月4日 20:18
>To: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx; Alex Williamson
>Subject: Re: [Xen-ia64-devel] [PATCH][RESEND]: clear the key part of cr.itir
>
>Am Mittwoch, 4. Juli 2007 schrieb Dietmar Hahn:
>> Hi,
>>
>> the attached patch clears the key part of the cr.itir register before itc.X
>> in alt_dtlb_miss(), alt_itlb_miss() and frametable_miss().
>> This is in preparation of using protection keys. The plan is to use the key
>> 0x0 for the hypervisor.
>> The patch doesn't change the footprint of the trap handlers.
>> Please send comments or commit.
>> Thanks.
>
>Sorry, the previous patch was buggy (overlooked the late_alt_itlb_miss entry
>point from itlb_miss.
>Thanks.

Hi Dietmar,

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?

Thanks,
Anthony

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