Re: about: XENMEM_machphys_mfn_list

[BVK Chaitanya <bayapuneni_chaitanya@symantec.com>]

Lin.Yu wrote:
> 
> XENMEM_machphys_mfn_list command is used to acquire the mapping between 
> the pseudo-physical to machine. And the hypercall will fill in the 
> struct xen_machphys_mfn_list.
> 
> I do not understand "This table is an array of pseudo-physical frame 
> numbers of the start of 2MB extents, corresponding to 2MB rangs in the 
> pseudo-physical address space".
> "This table" means the array pointed by xen_machphys_mfn_list.extent_start.
> 
> I am reading the code about this struct, still in confusion.
> :-)
> Who can help me?
> 


AFAIU, here "table" is nothing more than an array of xen_pfn_ts.

Only complication is, mfns returned are `base-mfns' for 2MB memory regions.

For example, if mfn 100 is returned, it means mfns 100-612 hold the 2MB 
region (612 = 100 + 512; 512 pages make 2MB)


--
bvk-chaitanya