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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 11.11.13 at 17:42, "Aravindh Puthiyaparambil (aravindp)"
<aravindp@xxxxxxxxx> wrote:
>>>>> 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?

I would think so, but I don't know enough about this mode to be
certain.

Jan


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