Re: [Xen-devel] mmap in PV xen-4.0.1

[Eric Camachat <eric.camachat@xxxxxxxxx>]

On Wed, Aug 10, 2011 at 6:31 PM, Wei Liu <liuw@xxxxxxxxx> wrote:
> On Wed, Aug 10, 2011 at 12:45:20PM -0700, Eric Camachat wrote:
>> The idea is move servers into XEN domU.
>> I saw that 3.0 has built-in XEN support, I can try it later.
>> But I don't know if other components are compatible with 3.0.
>>
>> I just wonder that MFN should equals PFN in PV (para-virtualization),
>> so it should works properly.
>>
>
> If by "PFN" you mean "Physical Frame Number", then I think you made a
> wrong assumption here.
>
> MFN and PFN has no linear, 1:1 mapping relationship, let alone say
> they are equal.
>
> Wei.
>
I misunderstood in GFN and PFN, MFN and GFN should be equal.
So PV domU has the same memory view with real hardware, right?

Ref. 
http://blog.xen.org/index.php/2009/10/09/xen-memory-management-overview-presentation/

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