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xen-ia64-devel
Re: [Xen-ia64-devel] Protection key support for PV domains
On Fri, Jul 20, 2007 at 03:21:56PM +0200, Dietmar Hahn wrote:
> Hi,
Hi.
> Can I replace pkrs[8];tmp[8]; with pkrs[16] to use this for protection keys
> or
> should I expand pkrs and leave tmp[8] untouched. How about changing the
> layout - is this possible here?
Given that xen/ia64 haven't keep the ABI compatibility (Yes, we have
changed the layout sometimes breaking the compatigbility), it would be
acceptable to change the layout, I suppose.
> In addition I would use a define for the number of pkrs. The only way to get
> this is define it in arch-ia64.h for use from vmm and domU. Is this OK or is
> there another solution possible?
Probably it would be OK because I don't suppose that the number will
be increased so frequently. Correct?
> Btw. I'll use Isaku's suggestion and will add a new hypercall to let vmm
> setup
> the cpu-pkrs with the values the domU changed.
Please note that I only read your patch and I haven't even tested your patch.
I'm not sure how you use pkrs.
The design decision should depend on its usage model.
--
yamahata
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