Re: [Xen-devel] 2.6.32 pv_ops and sparse/flat memory

[Daniel Kiper <dkiper@xxxxxxxxxxxx>]

Hi,

On Tue, Nov 23, 2010 at 09:42:46PM +0200, Pasi K?rkk?inen wrote:
> On Tue, Nov 23, 2010 at 10:01:21PM +0300, Vasiliy G Tolstov wrote:
> > On Tue, 2010-11-23 at 19:06 +0100, Daniel Kiper wrote:
> > > Hello,
> > >
> > > On Mon, Nov 22, 2010 at 01:22:30PM +0300, Vasiliy G Tolstov wrote:
> > > > On Mon, 2010-11-22 at 11:09 +0100, Daniel Kiper wrote:
> > > > > Hello,
> > > > >
> > > > > On Fri, Nov 19, 2010 at 04:44:17PM +0300, Vasiliy G Tolstov wrote:
> > > > > > Hello. I'm try to compile 32 bit pae kernel from xen git repo. If i
> > > > > > check sparse memory - i get error
> > > > >
> > > > > Please send me full address of Xen repository which you are using
> > > > > its head
> > > >
> > > > git clone git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen
> > > > git checkout -b xen/stable-2.6.32.x origin/xen/stable-2.6.32.x
> > > >
> > > > > and contents of your config file.
> > > > in attach, modify flat memory to sparse mem and compile under i686 arch
> > >
> > > As I find out it is normal behavior when CONFIG_XEN is enabled in this
> > > kernel version. Unlike mainline kernel this version establish new 
> > > PG_foreign
> > > page flag which with CONFIG_SPARSEMEM_MANUAL and CONFIG_HIGHMEM64G
> > > enabled overflow page flags field which is - surprise - 32-bit long in
> > > i386 (for more details read include/linux/page-flags.h file).
> > >
> > > Solution:
> > >   - enable CONFIG_HIGHMEM4G,
> > >   - disable CONFIG_XEN (I am not sure that it
> > >     is good one for you :-))) ).
> > >
> > > Daniel
> >
> > Thank You Daniel! But i need to able to run vm with 56Gb memory size and
> > highmem 4g not usable =). My question is - can i use memory about 56Gb
> > and use memory hotplug, what you write?  (using flat memory config)
>
> You could enable 64GB mem support..

Pasi, as I know it is not possible in Jeremy's kernel version
under i386 arch (please look above). If I am wrong please correct me.
Mainline kernel version under i386 arch with CONFIG_XEN, CONFIG_SPARSEMEM_MANUAL
and CONFIG_HIGHMEM64G compile without problem however, I do not tested it
as a PV guest (dom0 is not supported in this version).

Daniel

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