Re: [Xen-ia64-devel] Question to memory handling for domU

[Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxxxxxxx>]

Am Donnerstag, 10. August 2006 16:29 schrieben Sie:
> Le Jeudi 10 Août 2006 16:10, Dietmar Hahn a écrit :
> > Hi Tristan,
> >
> > Am Donnerstag, 10. August 2006 15:26 schrieb Tristan Gingold:
> > > Le Jeudi 10 Août 2006 15:13, Dietmar Hahn a écrit :
> > > > Hi,
> > > >
> > > > while I was playing with my mini-os and the memory a short question
> > > > comes up: What memory info is relevant and where gets the domU kernel
> > > > loaded within the (for domU) configured memory?
> > >
> > > domU kernel is loaded at its physical address (IIRC).  Check the ELF
> > > header.
> > >
> > > > I have 128MB configured for domU.
> > > > start_info->nr_pages gives me 8192 pages -> 128MB.
> > >
> > > Seems correct :-)
> > >
> > > > The memory given by the efi (EfiConventionalMemory) is physically
> > > > between 0x200000 and 0x7ff4000 -> ~2MB are absent.
> > > > Do I have to take this efi memory only, right? How is the absent
> > > > memory used?
> > >
> > > You have memory between 0 and 0x200000.  The start_info page is not in
> > > the memmap (IIRC).
> >
> > OK I understand. Between 0 and 0x200000 are the bootinfo, efi and pal
> > stuff. Between 0x200000 and 0x7ff4000 is the memory usable for mini-os.
> > This includes the kernel code and data.
> > Now only the area between 0x7ff4000 and 0x8000000 is unclear.
>
> 3 pages: 1 for xenbus, 1 for console and 1 for start_info.
>
> > Is 0x200000 a fix address?
>
> Yes, but we could reduce it.
>
> [...]
> Tristan.

Many thanks for the informations.

Dietmar.

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