Re: [Xen-devel] XENFEAT_writable_pagetables vs VMASST_TYPE_writable_pagetables

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 1 Jun 2006, at 08:42, Jacob Gorm Hansen wrote:

> > This doesn't look like the result of a pmd_clear() call. Looks like a
> > L2 (pgd) is being allocated -- perhaps due to pinning or changing 
> > %cr3.
> > It's failing because one of the L1 pages it references is writable by
> > the guest (ie. the guest has a writable mapping of that L1 page
> > somewhere).
> Hmm it _does_ happen on pmd_clear (which is a macro that turns into a
> xen mmu update call). The funny thing is how giving val=0 can end up
> as an alloc_l2_page.
Ah, ok I see the path. I need to fix up the logic in the mmu_update 
hypercall a little.
 -- Keir


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