[Xen-devel] Physical memory layout for dom0?

[Jiang Wang <jwangzju@xxxxxxxxx>]

Hi:

I want to understand the physical memory (or machine memory) layout
for dom 0 (suppose Linux is dom 0). In a normal Linux for x86-32, the
Linux kernel is linear mapped, and the physical address of a function
or variable is  (va - 0xc0000000). I can find out the physical address
given the virtual address of a function. In Xen, the memory of
hypervisor is also linear mapped and I can find it in
http://lxr.xensource.com/lxr/source/xen/include/asm-x86/config.h. But
how about dom 0? Is its kernel memory also linear mapped to the
machine memory? How can I find out the physical (machine) address of a
variable of function given its virtual address in dom 0? I guess the
memory  of domU is dynamically mapped because it may be migrated to
another machine. But dom 0 should be linear mapped, right?

PS: I am working on Xen 3.3.1 with a linux 2.6.18-xen as dom 0.

Regards,

Jiang

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