Re: [Xen-devel] [PATCH v3 0/9] libxc: support building large pv-domains

[Juergen Gross <jgross@xxxxxxxx>]

Ping?

On 10/13/2015 03:11 PM, 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)
> - HVM domU
>
> Changes in v3:
> - Rebased the complete series to new staging (hvm builder patches by
>    Roger Pau Monne)
> - Removed old patch 1 as it broke stubdom build
> - Introduced new Patch 1 to make allocation of guest memory more clear
>    regarding virtual/physical memory allocation (requested by Ian Campbell)
> - Change name of flag to indicate support of unmapped initrd in patch 2
>    (requested by Ian Campbell)
> - Introduce new patches 3, 4, 5 ("rename domain builder count_pgtables to
>    alloc_pgtables", "introduce domain builder architecture specific data",
>    "use domain builder architecture private data for x86 pv domains") to
>    assist later page table work
> - don't fiddle with initrd virtual address in patch 6 (was patch 3 in v2),
>    add explicit initrd parameters for start_info in struct xc_dom_image
>    instead (requested by Ian Campbell)
> - Introduce new patch 8 ("rework of domain builder's page table handler")
>    to be able to use common helpers for unmapped p2m list (requested by
>    Ian Campbell)
> - use now known segment size in pages for p2m list in patch 9 (was patch
>    5 in v2) instead of fiddling with segment end address (requested by
>    Ian Campbell)
> - split alloc_p2m_list() in patch 9 (was patch 5 in v2) to 32/64 bit
>    variants (requested by Ian Campbell)
>
> Changes in v2:
> - patch 2 has been removed as it has been applied already
> - introduced new patch 2 as suggested by Ian Campbell: add a flag
>    indicating support of an unmapped initrd to the parsed elf data of
>    the elf_dom_parms structure
> - updated patch description of patch 3 as requested by Ian Campbell
>
>
> Juergen Gross (9):
>    libxc: reorganize domain builder guest memory allocator
>    xen: add generic flag to elf_dom_parms indicating support of unmapped
>      initrd
>    libxc: rename domain builder count_pgtables to alloc_pgtables
>    libxc: introduce domain builder architecture specific data
>    libxc: use domain builder architecture private data for x86 pv domains
>    libxc: create unmapped initrd in domain builder if supported
>    libxc: split p2m allocation in domain builder from other magic pages
>    libxc: rework of domain builder's page table handler
>    libxc: create p2m list outside of kernel mapping if supported
>
>   stubdom/grub/kexec.c               |  12 +-
>   tools/libxc/include/xc_dom.h       |  32 +--
>   tools/libxc/xc_dom_arm.c           |   6 +-
>   tools/libxc/xc_dom_core.c          | 174 +++++++++----
>   tools/libxc/xc_dom_x86.c           | 496 ++++++++++++++++++++++++-------------
>   xen/arch/x86/domain_build.c        |   4 +-
>   xen/common/libelf/libelf-dominfo.c |   3 +
>   xen/include/xen/libelf.h           |   1 +
>   8 files changed, 480 insertions(+), 248 deletions(-)

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