Jeremy Fitzhardinge <[email protected]> writes:
> I don't have any particularly bright ideas, but there is the other idea
> I mentioned. I could pre-initialize the pagetable with the Xen
> template, but use unconditional calls to set_pte in pagetable_init.
> However, the init-time xen_set_pte simply refuse to set _PAGE_WRITE on a
> pte which isn't already writable, thereby protecting the RO state of the
> pagetable pages. Once pagetable construction has finished, it would
> switch to the real xen_set_pte, which operates as normal.
>
> This has the downside of making init-time xen_set_pte a little strange,
> but it does have the advantage of making the Xen constraints solely the
> responsibility of the Xen code, and it is mitigated by the fact that it
> is only in effect during pagetable_init.
>
> Would that work for everyone?
For a short term solution it sounds reasonable.
Eric
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