Re: [Xen-devel] Max gpfn for PV guests

["Aravindh Puthiyaparambil (aravindp)" <aravindp@xxxxxxxxx>]

>>>> On 08.11.13 at 21:58, "Aravindh Puthiyaparambil (aravindp)"
><aravindp@xxxxxxxxx> wrote:
>> I am trying to find out the max pgfn for a 256MB PV guest. If I call
>> xc_domain_getinfolist() and look at xc_domaininfo->max_pages, I get
>> 0x10100. If I call xc_domain_getinfo() and look at xc_dominfo->nr_pages, I
>get 0x10000.
>> Within the hypervisor if I call domain_get_maximum_gpfn(), I get
>> 0xffff. So it looks like xc_domain_getinfo() is returning the correct
>> value. Why is
>> xc_domain_getinfolist() returning a different value? Which value
>> should I be looking at for the max gpfn?
>
>I'm afraid none of these - since PV guests control the P2M mapping
>themselves, there simply is no "max GPFN" being tracked here. (The value
>returned by domain_get_maximum_gpfn() originates from the shared info
>structure, i.e. again is only valid if the guest cares to maintain that field.)

Does this also hold true for PV guests running with shadow page tables?

Thanks,
Aravindh
 

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