Re: [PATCH 0/6] grub-xen: support booting huge pv-domains

[Juergen Gross <jgross@suse.com>]

On 02/11/15 06:51, 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 grub-xen to do the same as the hypervisor.
> 
> 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 (6):
>   xen: factor out p2m list allocation into separate function
>   xen: factor out allocation of special pages into separate function
>   xen: factor out allocation of page tables into separate function
>   xen: add capability to load initrd outside of initial mapping
>   xen: modify page table construction
>   xen: add capability to load p2m list outside of kernel mapping
> 
>  grub-core/lib/i386/xen/relocator.S   |  47 ++--
>  grub-core/lib/x86_64/xen/relocator.S |  41 ++-
>  grub-core/lib/xen/relocator.c        |  22 +-
>  grub-core/loader/i386/xen.c          | 521 +++++++++++++++++++++++++----------
>  grub-core/loader/i386/xen_fileXX.c   |   7 +
>  include/grub/xen/relocator.h         |   6 +-
>  include/grub/xen_file.h              |   3 +
>  7 files changed, 446 insertions(+), 201 deletions(-)
> 

I'd really appreciate some kind of reaction.

Is the general approach acceptable?


Juergen