[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Xen-devel] Re: Xen MMU's requirement to pin pages RO and initial_memory_mapping.



On 05/16/2011 08:41 AM, Konrad Rzeszutek Wilk wrote:
>> They become pagetable pages when:
>>
>> - they are explicitly pinned by pin_pagetable_pfn
>>
>> - they are hooked into the current pagetable
> 
> Ok, so could we use those two calls to trigger the pagetable walk
> and mark them RO as appropiate? Which call sites are those? The
> xen_set_pgd/xen_set_pud/xen_set_pmd ? Presumarily we don't have
> to do that for the PTE's that are already mapped (as
> xen_setup_kernel_pagetable, and xen_map_identity_early do this
> already).
> 
>> Like you wrote, considering that the x86_64 version of
>> kernel_physical_mapping_init hooks the pagetable pages into the
>> currently used pagetable, it wouldn't be possible to mark the pagetable
>> pages RO after init_memory_mapping.
> 

Doesn't Xen have some kind of compatibility mode which could be used
during setup?

        -hpa


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel


 


Rackspace

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.