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Re: [Xen-ia64-devel] Protection key support for PV domains
| To: | Tristan Gingold <tgingold@xxxxxxx> |
|---|---|
| Subject: | Re: [Xen-ia64-devel] Protection key support for PV domains |
| From: | Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxxxxxxx> |
| Date: | Fri, 13 Jul 2007 11:31:22 +0200 |
| Cc: | xen-ia64-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Fri, 13 Jul 2007 02:28:57 -0700 |
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Hi Tristan,
I have still a question:
Am Freitag, 13. Juli 2007 schrieb Tristan Gingold:
> > + * cache.
> > + */
> > +static inline void
> > +ia64_itc_PKR (__u64 target_mask, __u64 vmaddr, __u64 pte,
> > + __u64 log_page_size, __u64 key)
>
> If log_page_size and key are merged into itir, no need to define this
> function.
The current used linux function is:
static inline void
ia64_itc (__u64 target_mask, __u64 vmaddr, __u64 pte,
__u64 log_page_size)
{
ia64_setreg(_IA64_REG_CR_ITIR, (log_page_size << 2));
...
If I use ia64_itc() I would have to do a hack to prepare a special itir to fit
key + ps into log_page_size the right way.
itir = (IA64_ITIR_PS_KEY(logps, key) >> 2)
This was the reason to expand the linux function.
OK I can do this with a big comment but it's not fine.
Thanks.
Dietmar.
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