Re: [Xen-devel] bogus gfn - mfn - gfn - mfn checks in guest_physmap_add_entry

[Keir Fraser <keir@xxxxxxx>]

On 25/11/2010 15:03, "Olaf Hering" <olaf@xxxxxxxxx> wrote:

>> The guest_physmap_add_entry code, and the p2m audit code, would be made
>> more reliable if, say, alloc_domheap_pages and/or free_domheap_pages
>> zapped the m2p entries for MFNs they touched.
>> 
>> I think originally that wasn't done because the alloc is quickly
>> followed by another write of the m2p but that's probably over-keen
>> optimization.
> 
> Could it be done like that? (not yet compile-tested)
> The mfn is probably always valid.

If you xap m2p in free_domheap_pages(), you shouldn't need to do it again in
alloc_domheap_pages().

 -- Keir



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