Re: [Xen-devel] EPT question - XENMEM_get_access_op

[Tamas K Lengyel <tamas.lengyel@xxxxxxxxxxxx>]

On Fri, Feb 20, 2015 at 3:21 PM, Balbir Singh <bsingharora@xxxxxxxxx> wrote:
> [snip]
> On Fri, Feb 20, 2015 at 5:21 PM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
>>> Thanks Jan! Is there a way for a memevents channel consumer to get
>>> access to the L1 (OS Page tables).
>>
>> Hardly.
>>
>>> I presume we'll need to walk the
>>> page tables, I suspect the current access_op is broken without it and
>>> may not be returning anything meaningful in most of the cases
>>
>> It's not broken in any way, you just seem to have wrong expectations.
>
>
> Probably, because I am interested in the final protection as seen by
> an application or kernel and I'm trying to find a way to get that
> information. For me the effective permission set is of interest.
>
> Balbir

You can get the guest pagetable permissions via LibVMI:
http://libvmi.com/api/#func_vmi_pagetable_lookup_extended

Cheers,
Tamas

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel