[Xen-devel] Confused about mapped pages "struct page" updates

["Waseem, Amna" <a.waseem@xxxxxxxxxxxxxxxxxxx>]

Hello All,

I am a little confused about mapping mechanism in Xen for page from DomU to 
Dom0.

When Dom0 maps DomU page to its applied host_addr, Page table entries are 
created by Xen hypervisor for mapping  applied host_addr vritual  address of 
Dom0 to DomU physical page. The result is host_addr maps to DomU phsyical page.

Now in network backend driver, virt_to_page macro is called on this mapped 
host_addr. How does Dom0 gets struct page for the mapped DomU page in its 
domain? Is Xen also updates mem_map array of Dom0 to create struct page for the 
mapped page? Or Dom0 creates struct page for all the physical memory including 
provided to DomU during its creation ?

Can anybody tell me how struct page for mapped pages from another domain gets 
updated or created in DOm0?

Any help will be appreciated
Thanks
Amna
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