Introduce necessary things to enable DOMAIN_BUILD_HELPERS config for RISC-V.

Generally it is indepenent patch series from [1] and [2] but depends on which
patches will go first it could be some merge conflicts.

At the moment, patch series is rebased on top of [2]:
  staging -> [1] -> [2] -> current patch series.

[1] https://lore.kernel.org/xen-devel/cover.1770650552.git.oleksii.kurochko@gmail.com/T/#t
[2] https://lore.kernel.org/xen-devel/cover.1770739000.git.oleksii.kurochko@gmail.com/T/#t

Oleksii Kurochko (6):
  xen/riscv: implement get_page_from_gfn()
  xen/riscv: implement copy_to_guest_phys()
  xen/riscv: add zImage kernel loading support
  xen: move declaration of fw_unreserved_regions() to common header
  xen: move domain_use_host_layout() to common header
  xen/riscv: enable DOMAIN_BUILD_HELPERS

 xen/arch/arm/include/asm/domain.h         |  14 --
 xen/arch/arm/include/asm/setup.h          |   3 -
 xen/arch/riscv/Kconfig                    |   1 +
 xen/arch/riscv/Makefile                   |   2 +
 xen/arch/riscv/guestcopy.c                | 112 ++++++++++++++++
 xen/arch/riscv/include/asm/config.h       |  13 ++
 xen/arch/riscv/include/asm/guest_access.h |   7 +
 xen/arch/riscv/include/asm/p2m.h          |  11 +-
 xen/arch/riscv/kernel.c                   | 156 ++++++++++++++++++++++
 xen/arch/riscv/p2m.c                      |  34 +++++
 xen/include/public/arch-riscv.h           |   8 ++
 xen/include/xen/bootinfo.h                |   4 +
 xen/include/xen/domain.h                  |  16 +++
 13 files changed, 358 insertions(+), 23 deletions(-)
 create mode 100644 xen/arch/riscv/guestcopy.c
 create mode 100644 xen/arch/riscv/kernel.c

-- 
2.52.0