Re: [Xen-ia64-devel] [patch 06/12] ia64: kexec: Repining for EFI RID

[Simon Horman <horms@xxxxxxxxxxxx>]

On Thu, Apr 24, 2008 at 03:55:15AM +0200, Tristan Gingold wrote:
> On Thu, Apr 24, 2008 at 09:04:01AM +1000, Simon Horman wrote:
> > A cut down version of set_one_rr (and ia64_new_rr7) for
> > use when switching to the EFI RID for SAL, PAL and EFI calls.
> 
> Hi,
> 
> is it for efficienty or fonctionnaly required ?

The reason that it is cut down is just for functionality.
The functionlity could be merged into the existing code.
But I thought that would be best to get it right first.
This is particularly true of the asm code, which
I think could become very messy.

As for the reason for switching the RID in the first place.
This is to protect the memory from HVM domains.

> > There seems to be no need to repin: palcode, mapped_regs or vhpt in this
> > case. If it turns they do need to be repinned then special care needs to
> 
> Humm, even PAL ?

Yes, surprisingly so. Though it does seem to be harmless to repin it.

-- 
Horms


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