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

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

[1] https://lore.kernel.org/xen-devel/eba232ac5a338332ddedc2cb084e0c04ee8744c2.1775835741.git.oleksii.kurochko@gmail.com/T/#u

CI tests: https://gitlab.com/xen-project/people/olkur/xen/-/pipelines/2444698148

---
Changes in v3:
 - Address the comments from ML.
---
Changes in v2:
 - Address the comments from ML.
 - Introduce some new patches to make dom0less solution more architecture
   indepenent from terminology point of view.
 - Minor fixes.
---

Oleksii Kurochko (12):
  xen/riscv: implement get_page_from_gfn()
  xen: fix len type for guest copy functions
  xen/riscv: implement copy_to_guest_phys()
  xen/dom0less: rename kernel_zimage_probe() to kernel_image_probe()
  xen/riscv: add kernel loading support
  xen: move declaration of fw_unreserved_regions() to common header
  xen: introduce domain-layout.h with common domain_use_host_layout()
  xen/riscv: rework G-stage mode handling
  xen: rename p2m_ipa_bits to p2m_gpa_bits
  xen/riscv: introduce p2m_gpa_bits
  xen/riscv: add definition of guest RAM banks
  xen/riscv: enable DOMAIN_BUILD_HELPERS

 xen/arch/arm/domain_build.c               |   1 +
 xen/arch/arm/guestcopy.c                  |   6 +-
 xen/arch/arm/include/asm/domain.h         |  14 --
 xen/arch/arm/include/asm/guest_access.h   |   2 +-
 xen/arch/arm/include/asm/p2m.h            |   2 +
 xen/arch/arm/include/asm/setup.h          |   3 -
 xen/arch/arm/kernel.c                     |  48 ++---
 xen/arch/arm/vgic-v3.c                    |   1 +
 xen/arch/riscv/Kconfig                    |   1 +
 xen/arch/riscv/Makefile                   |   3 +
 xen/arch/riscv/dom0less-build.c           |  30 +++
 xen/arch/riscv/guestcopy.c                | 116 +++++++++++
 xen/arch/riscv/include/asm/config.h       |  13 ++
 xen/arch/riscv/include/asm/domain.h       |   1 +
 xen/arch/riscv/include/asm/guest-layout.h |  23 +++
 xen/arch/riscv/include/asm/guest_access.h |   7 +
 xen/arch/riscv/include/asm/p2m.h          |  29 +--
 xen/arch/riscv/kernel.c                   | 230 ++++++++++++++++++++++
 xen/arch/riscv/p2m.c                      | 141 +++++++++----
 xen/arch/riscv/vmid.c                     |   2 +-
 xen/common/device-tree/domain-build.c     |   3 +-
 xen/common/device-tree/kernel.c           |   2 +-
 xen/include/public/arch-riscv.h           |   5 +
 xen/include/xen/bootinfo.h                |   4 +
 xen/include/xen/domain-layout.h           |  28 +++
 xen/include/xen/fdt-domain-build.h        |   2 +-
 xen/include/xen/fdt-kernel.h              |  15 +-
 27 files changed, 631 insertions(+), 101 deletions(-)
 create mode 100644 xen/arch/riscv/dom0less-build.c
 create mode 100644 xen/arch/riscv/guestcopy.c
 create mode 100644 xen/arch/riscv/include/asm/guest-layout.h
 create mode 100644 xen/arch/riscv/kernel.c
 create mode 100644 xen/include/xen/domain-layout.h

-- 
2.53.0