Re: [Xen-users] dom0's layout on physical memory?

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2013-02-01 at 00:31 +0000, Min Lee wrote:
> Hello, all
> I thought dom0 is layed out on physical memory starting 0, linearly, but
> this message,
> 
> (XEN) *** LOADING DOMAIN 0 ***
> (XEN)  Xen  kernel: 64-bit, lsb, compat32
> (XEN)  Dom0 kernel: 64-bit, PAE, lsb, paddr 0x1000000 -> 0x1d87000
> (XEN) PHYSICAL MEMORY ARRANGEMENT:
> (XEN)  Dom0 alloc.:   0000000c14000000->0000000c18000000 (498514 pages to 
> be allocated)
> 
> shows the address range 0000000c14000000->0000000c18000000  ,
> what is this?

That is the virtual address range.

The start of day memory layout is described in
http://xenbits.xen.org/docs/unstable/hypercall/include,public,xen.h.html#incontents_startofday

>  it's 64MB range and why 64MB from Dom0 is located here?

This is the size of the initial mapping given your kenrel and initrd
size etc.

> I think 498514 pages will be allocated later, but where, exactly??

IIRC the kernel will map it as part of its initialisation,
init_memory_mapping() in Linux perhaps?

> if dom0's memory is partitioned into several places,
> then, what happens to their GPFN??

I'm not sure I understand this question.

Ian.



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