Re: [Xen-devel] [PATCH 0/5] libxc: support building large pv-domains

[Juergen Gross <jgross@xxxxxxxx>]

On 09/11/2015 03:28 PM, Ian Campbell wrote:
> On Fri, 2015-09-11 at 14:32 +0200, Juergen Gross wrote:
> > The Xen hypervisor supports starting a dom0 with large memory (up to
> > the TB range) by not including the initrd and p2m list in the initial
> > kernel mapping. Especially the p2m list can grow larger than the
> > available virtual space in the initial mapping.
> >
> > The started kernel is indicating the support of each feature via
> > elf notes.
> >
> > This series enables the domain builder in libxc to do the same as the
> > hypervisor. This enables starting of huge pv-domUs via xl.
> >
> > Unmapped initrd is supported for 64 and 32 bit domains, omitting the
> > p2m from initial kernel mapping is possible for 64 bit domains only.
> >
> > Tested with:
> > - 32 bit domU (kernel not supporting unmapped initrd)
> > - 32 bit domU (kernel supporting unmapped initrd)
> > - 1 GB 64 bit domU (kernel supporting unmapped initrd, not p2m)
> > - 1 GB 64 bit domU (kernel supporting unmapped initrd and p2m)
> > - 900GB 64 bit domU (kernel supporting unmapped initrd and p2m)
> >
> > Juergen Gross (5):
> >    libxc: remove allocate member from struct xc_dom_image
> >    libxc: do initrd processing of domain builder in own function
> >    libxc: create unmapped initrd in domain builder if supported
> >    libxc: split p2m allocation in domain builder from other magic pages
> >    libxc: create p2m list outside of kernel mapping if supported
> >
> >   tools/libxc/include/xc_dom.h |   4 +-
> >   tools/libxc/xc_dom_core.c    | 123 +++++++++++++++++++++++++++++--------------
> >   tools/libxc/xc_dom_x86.c     | 120 ++++++++++++++++++++++++++++++++++++++++-
> How much is this going to conflict with Roger's "Introduce HVM without dm
> and new boot ABI" changes to HVM building?
As it is touching the pv domain builder only, I don't think there will
be a conflict. All rights of being wrong reserved. :-)

Juergen


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