[Xen-devel] How to convert from virtual to machine address (any macros?)

["Joana M. F. Trindade" <jmftrindade@xxxxxxxxx>]

Hi,

I browsed the archives, but could not find an example on this. What are the macros for converting a virtual address to machine address on Xen in x86 architectures?

For example, on a non-virtualized dom0, the following code works:

static int virt_to_phys (struct task_struct *p, unsigned long addr) {
   // (...)
   ret = get_user_pages (p, p->mm, addr, 1, 1, 1, &page, &vma);
   if (ret <= 0) {
      // do something
   }
   offset = addr & (PAGE_SIZE - 1);
   maddr = kmap (page);
   return (int) maddr + offset;
}

However, this mapping seems incorrect on the same dom0 on top of Xen. Therefore, I would like to know if there's an example (or pointers to macros) on how to do the virtual->pseudo-physical->machine address mapping on Xen.

Thanks and regards,
Joana

-- 
Joana M. F. da Trindade
Visiting Scholar
Center for Reliable and High-Performance Computing
University of Illinois at Urbana-Champaign

Personal Homepage: http://joanatrindade.wikidot.com
LinkedIn: http://www.linkedin.com/in/joanatrindade
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