Reserve physical page

Hello everyone,
   I am wondering whether it is possible to reserve a particular physical
page in the kernel.
The GFP pages can start from _any_ location, and i cannot find a way to
specify a starting pfn.
I need a few dozen pages to store a bitmap starting at a particular physical
page frame number.
   Perhaps i am trying to do this wrong? I am trying to establish a
(one-way) communication between KVM and a guest VM, by assuming that if KVM
knows the physical address in the VM , it can access that bitmap.

  Thanks !
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