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[Minios-devel] [PATCH v3 00/19] mini-os: support of auto-ballooning

Support ballooning Mini-OS automatically up in case of memory shortage.

Do some cleanups, a small correction and add some basic features to
lay groundwork for support of ballooning in Mini-OS (patches 1-14).

The main visible change is the virtual memory layout: to be able to
add memory to the running Mini-OS we need to have some spare areas
especially after the 1:1 mapping of physical memory.

Then add the ballooning functionality: the p2m map must be expanded,
the page allocator's bitmap must  be expanded and we must get new
memory from the hypervisor.

In case of a detected memory shortage the domain will balloon up until
either enough memory is available or the upper limit has been reached.

Ballooning has been tested with a xenstore stubdom.
Regression tests have been done with:
- pure mini-os
- ioemu stubdom
- pvgrub 64 bit

pvgrub 32 bit didn't work before applying the series, it just entered
the grub shell. With the series applied the behavior was exactly the
same. The grub shell however was working (I tried "help" and "reboot").

I tried to modify arm specific files in order not to break the
non-ballooning case, but I haven't tested it to either work or to

V1 of this series consisted of patches 1-9 only.

Changes in V3:
- some minor adjustments as requested by Samuel Thibault
- added patch 19

Changes in V2:
- added patches 10-18
- some coding style corrections
- patch 7: introduced balloon specific source files
- moved ballooning specific functions/definitions to ballon specific
- patch 9: avoid conflict with hypervisor mapped area on 32 bits

Juergen Gross (19):
  mini-os: correct first free pfn
  mini-os: remove unused alloc_contig_pages() function
  mini-os: remove MM_DEBUG code
  mini-os: add description of x86 memory usage
  mini-os: add nr_free_pages counter
  mini-os: let memory allocation fail if no free page available
  mini-os: add ballooning config item
  mini-os: get maximum memory size from hypervisor
  mini-os: modify virtual memory layout for support of ballooning
  mini-os: remove unused mem_test() function
  mini-os: add checks for out of memory
  mini-os: don't allocate new pages for level 1 p2m tree
  mini-os: add function to map one frame
  mini-os: move p2m related macros to header file
  mini-os: remap p2m list in case of ballooning
  mini-os: map page allocator's bitmap to virtual kernel area for
  mini-os: add support for ballooning up
  mini-os: balloon up in case of oom
  mini-os: repair build system

 Config.mk             |  93 +++++++++++++++
 Makefile              |  43 +------
 arch/arm/balloon.c    |  39 +++++++
 arch/arm/mm.c         |  10 +-
 arch/x86/Makefile     |   3 -
 arch/x86/balloon.c    | 147 +++++++++++++++++++++++
 arch/x86/mm.c         | 314 +++++++-------------------------------------------
 balloon.c             | 160 +++++++++++++++++++++++++
 config/MiniOS.mk      |  10 --
 config/StdGNU.mk      |  47 --------
 config/arm32.mk       |  22 ----
 config/arm64.mk       |  19 ---
 config/x86_32.mk      |  20 ----
 config/x86_64.mk      |  33 ------
 include/arm/arch_mm.h |   2 +
 include/balloon.h     |  59 ++++++++++
 include/mm.h          |  13 ++-
 include/x86/arch_mm.h |  70 +++++++++++
 minios.mk             |   4 +-
 mm.c                  | 131 ++++++++-------------
 20 files changed, 682 insertions(+), 557 deletions(-)
 create mode 100644 arch/arm/balloon.c
 create mode 100644 arch/x86/balloon.c
 create mode 100644 balloon.c
 delete mode 100644 config/MiniOS.mk
 delete mode 100644 config/StdGNU.mk
 delete mode 100644 config/arm32.mk
 delete mode 100644 config/arm64.mk
 delete mode 100644 config/x86_32.mk
 delete mode 100644 config/x86_64.mk
 create mode 100644 include/balloon.h


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