hva_to_pfn and memory leak

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Hello, guys!

I have written paravirtual interface for GPA->HPA translation inside guest. I build GPA->HPA translation table in guest virtual memory. 
To do this, I need to translate userspace virtual address from  memslot to host physical address. I use hva_to_pfn for it. It works fine, but linux doesn't free the guest
memory after guest power off. After testing I have found that cause of memory leak is hva_to_pfg call. You can find my code at http://pastebin.com/0zBV2aPN. 
Do I translate hva to hpa in the right way? 

I do this patch for RHEL Linux Kernel 2.6.32-279.5.2.el6 because I use CentOS 6.3.

Thanks!

Vladimir.



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