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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> 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.)

Jan


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