Hello all,

This patch series adds support for building a minimal image
(head.o-only) for Power ISA 2.07B+ (POWER8+) systems. The first patch
boots to an infinite loop and the second adds early serial console
support on pseries VMs, with bare metal support planned next.

Since Xen previously had support for a much older version of the ISA in
version 3.2.3, we were able to carry over some headers and support
routines from that version. Unlike that initial port though, this effort
focuses solely on POWER8+ CPUs that are capable of running in Little
Endian mode.

With an appropriate powerpc64le-linux-gnu cross-toolchain, the minimal
image can be built with:

$ make XEN_TARGET_ARCH=ppc64 -C xen openpower_defconfig
$ make XEN_TARGET_ARCH=ppc64 SUBSYSTEMS=xen -C xen TARGET=ppc64/head.o

The resulting head.o can then be booted in a standard QEMU/pseries VM:

$ qemu-system-ppc64 -M pseries-5.2 -m 256M -kernel xen/ppc64/head.o \
	-vga none -serial mon:stdio -nographic

Thanks,
Shawn

--
Changes from v2:
  - Add ppc64le cross-build container patch
  - Add ppc64le cross build CI job patch
  - Drop serial output patch (will be in future patch series)
  - Drop setup.c and unneeded headers from minimal build patch
  - Fixed ordering of MAINTAINERS patch + add F: line
  - Fix config/ppc64.mk option names
  - Clarify Kconfig Baseline ISA option help strings

Shawn Anastasio (4):
  automation: Add container for ppc64le builds
  xen: Add files needed for minimal ppc64le build
  automation: Add ppc64le cross-build jobs
  maintainers: Add ppc64 maintainer

 MAINTAINERS                                   |   4 +
 .../build/debian/bullseye-ppc64le.dockerfile  |  28 +++
 automation/gitlab-ci/build.yaml               |  60 ++++++
 automation/scripts/containerize               |   1 +
 config/ppc64.mk                               |   5 +
 xen/Makefile                                  |   5 +-
 xen/arch/ppc/Kconfig                          |  42 +++++
 xen/arch/ppc/Kconfig.debug                    |   0
 xen/arch/ppc/Makefile                         |  16 ++
 xen/arch/ppc/Rules.mk                         |   0
 xen/arch/ppc/arch.mk                          |  11 ++
 xen/arch/ppc/configs/openpower_defconfig      |  13 ++
 xen/arch/ppc/include/asm/config.h             |  63 +++++++
 xen/arch/ppc/include/asm/page-bits.h          |   7 +
 xen/arch/ppc/ppc64/Makefile                   |   1 +
 xen/arch/ppc/ppc64/asm-offsets.c              |   0
 xen/arch/ppc/ppc64/head.S                     |  27 +++
 xen/arch/ppc/xen.lds.S                        | 173 ++++++++++++++++++
 18 files changed, 454 insertions(+), 2 deletions(-)
 create mode 100644 automation/build/debian/bullseye-ppc64le.dockerfile
 create mode 100644 config/ppc64.mk
 create mode 100644 xen/arch/ppc/Kconfig
 create mode 100644 xen/arch/ppc/Kconfig.debug
 create mode 100644 xen/arch/ppc/Makefile
 create mode 100644 xen/arch/ppc/Rules.mk
 create mode 100644 xen/arch/ppc/arch.mk
 create mode 100644 xen/arch/ppc/configs/openpower_defconfig
 create mode 100644 xen/arch/ppc/include/asm/config.h
 create mode 100644 xen/arch/ppc/include/asm/page-bits.h
 create mode 100644 xen/arch/ppc/ppc64/Makefile
 create mode 100644 xen/arch/ppc/ppc64/asm-offsets.c
 create mode 100644 xen/arch/ppc/ppc64/head.S
 create mode 100644 xen/arch/ppc/xen.lds.S

-- 
2.30.2

On Mon Jun 12, 2023 at 9:51 AM CDT, Shawn Anastasio wrote:
> With an appropriate powerpc64le-linux-gnu cross-toolchain, the minimal
> image can be built with:
>
> $ make XEN_TARGET_ARCH=ppc64 -C xen openpower_defconfig
> $ make XEN_TARGET_ARCH=ppc64 SUBSYSTEMS=xen -C xen TARGET=ppc64/head.o

Minor clarification to this cover letter, the manual TARGET= override
is not necessary. All that is needed is:

$ make XEN_TARGET_ARCH=ppc64 SUBSYSTEMS=xen -C xen build

Thanks,
Shawn