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[Xen-devel] [PATCH v6 00/25] dom0less step1: boot multiple domains from device tree

Hi all,

This is first step toward "dom0less" as discussed in the various
certifications related threads and discussions.

The goal of this series is to enable Xen to boot multiple domains in
parallel, in addition to dom0, out of information found on device tree.

The device tree based boot protocol is extended to carry information
about DomUs. Based on that information, Xen creates and starts one or
more DomUs. DomUs created this way don't have access to xenstore for the
moment. This is actually OK, because this is meant for mission critical
applications that typically only access directly assigned devices. They
cannot tolerate interference or increased IRQ latency due to PV
protocols. Device assignment is not actually covered by this series, it
will be added later.

DomUs can print to the Xen serial using the CONSOLEIO hypercalls. A
virtual PL011 is also emulated for them so that they can use their
regular PL011 driver. This allows unmodified guests to run as Xen on ARM
guests -- no Xen support needed at all. Console input also comes from
the Xen serial: the Ctrl-AAA switching mechanism is extended to switch
among domUs, dom0, and Xen.

In this version of the series, I reordered the patches to make sure they
are all bisectable.



The following changes since commit 359970fd8b781fac2ddcbc84dd5b890075fa08ef:

  tools/libxl: Switch Arm guest type to PVH (2018-10-03 15:58:02 +0100)

are available in the git repository at:


for you to fetch changes up to 403ae582e24b30e4e78b015ce2ddba8de07686a9:

  xen/arm: split domain_build.c (2018-11-02 15:21:46 -0700)

Stefano Stabellini (26):
      xen: allow console_io hypercalls from certain DomUs
      xen/arm: extend device tree based multiboot protocol
      xen/arm: document dom0less
      xen/arm: increase MAX_MODULES
      xen/arm: check for multiboot nodes only under /chosen
      xen/arm: introduce bootcmdlines
      xen/arm: don't add duplicate boot modules, introduce domU flag
      xen/arm: probe domU kernels and initrds
      xen/arm: add start to struct bootcmdline
      xen/arm: rename get_11_allocation_size to get_allocation_size
      xen/arm: rename allocate_memory to allocate_memory_11
      xen/arm: introduce allocate_memory
      xen/arm: refactor construct_dom0
      xen/arm: move unregister_init_virtual_region to init_done
      xen/arm: introduce create_domUs
      xen/arm: implement construct_domU
      xen/arm: generate a simple device tree for domUs
      xen/arm: make set_interrupt_ppi able to handle non-PPI
      xen/arm: generate vpl011 node on device tree for domU
      xen/arm: introduce a union in vpl011
      xen/arm: refactor vpl011_data_avail
      xen: support console_switching between Dom0 and DomUs on ARM
      xen/arm: Allow vpl011 to be used by DomU
      xen/vpl011: buffer out chars when the backend is xen
      xen/arm: move kernel.h to asm-arm/
      xen/arm: split domain_build.c

 docs/INDEX                                 |    1 +
 docs/features/dom0less.markdown            |   49 ++
 docs/misc/arm/device-tree/booting.txt      |  107 +++
 xen/arch/arm/acpi/Makefile                 |    1 +
 xen/arch/arm/acpi/domain_build.c           |  591 +++++++++++++++
 xen/arch/arm/bootfdt.c                     |   58 +-
 xen/arch/arm/domain_build.c                | 1092 +++++++++++++---------------
 xen/arch/arm/kernel.c                      |   67 +-
 xen/arch/arm/setup.c                       |  112 ++-
 xen/arch/arm/vpl011.c                      |  297 ++++++--
 xen/drivers/char/console.c                 |   90 ++-
 xen/include/asm-arm/domain_build.h         |   31 +
 xen/{arch/arm => include/asm-arm}/kernel.h |    6 +-
 xen/include/asm-arm/setup.h                |   36 +-
 xen/include/asm-arm/vpl011.h               |   20 +-
 xen/include/asm-x86/setup.h                |    2 +
 xen/include/xen/console.h                  |    2 +
 xen/include/xen/sched.h                    |    2 +
 xen/include/xsm/dummy.h                    |    2 +
 19 files changed, 1861 insertions(+), 705 deletions(-)
 create mode 100644 docs/features/dom0less.markdown
 create mode 100644 xen/arch/arm/acpi/domain_build.c
 create mode 100644 xen/include/asm-arm/domain_build.h
 rename xen/{arch/arm => include/asm-arm}/kernel.h (91%)

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