[PATCH v4 00/18 for 4.22] xen/riscv: introduce p2m functionality

[Oleksii Kurochko <oleksii.kurochko@gmail.com>]

In this patch series are introduced necessary functions to build and manage
RISC-V guest page tables and MMIO/RAM mappings.

---
Changes in V4:
 - Merged to staging:
   - xen/riscv: introduce sbi_remote_hfence_gvma()
   - xen/riscv: introduce sbi_remote_hfence_gvma_vmid()
 - Drop "xen/riscv: introduce page_{get,set}_xenheap_gfn()" as grant tables aren't going to be introduced for the moment. Also, drops other parts connected to grant tables support.
 - All other changes are patch specific.
---
Changes in V3:
 - Introduce metadata table to store P2M types.
 - Use x86's way to allocate VMID.
 - Abstract Arm-specific p2m type name for device MMIO mappings.
 - All other updates please look at specific patch.
---
Changes in V2:
 - Merged to staging:
   - [PATCH v1 1/6] xen/riscv: add inclusion of xen/bitops.h to asm/cmpxchg.h
 - New patches:
   - xen/riscv: implement sbi_remote_hfence_gvma{_vmid}().
 - Split patch "xen/riscv: implement p2m mapping functionality" into smaller
   one patches:
   - xen/riscv: introduce page_set_xenheap_gfn()
   - xen/riscv: implement guest_physmap_add_entry() for mapping GFNs to MFNs
   - xen/riscv: implement p2m_set_entry() and __p2m_set_entry()
   - xen/riscv: Implement p2m_free_entry() and related helpers
   - xen/riscv: Implement superpage splitting for p2m mappings
   - xen/riscv: implement p2m_next_level()
   - xen/riscv: Implement p2m_entry_from_mfn() and support PBMT configuration
 - Move root p2m table allocation to separate patch:
   xen/riscv: add root page table allocation
 - Drop dependency of this patch series from the patch witn an introduction of
   SvPBMT as it was merged.
 - Patch "[PATCH v1 4/6] xen/riscv: define pt_t and pt_walk_t structures" was
   renamed to xen/riscv: introduce pte_{set,get}_mfn() as after dropping of
   bitfields for PTE structure, this patch introduce only pte_{set,get}_mfn().
 - Rename "xen/riscv: define pt_t and pt_walk_t structures" to
   "xen/riscv: introduce pte_{set,get}_mfn()" as pt_t and pt_walk_t were
   dropped.
 - Introduce guest domain's VMID allocation and manegement.
 - Add patches necessary to implement p2m lookup:
   - xen/riscv: implement mfn_valid() and page reference, ownership handling helpers
   - xen/riscv: add support of page lookup by GFN
 - Re-sort patch series.
 - All other changes are patch-specific. Please check them.
---

Oleksii Kurochko (18):
  xen/riscv: detect and initialize G-stage mode
  xen/riscv: introduce VMID allocation and manegement
  xen/riscv: introduce things necessary for p2m initialization
  xen/riscv: construct the P2M pages pool for guests
  xen/riscv: add root page table allocation
  xen/riscv: introduce pte_{set,get}_mfn()
  xen/riscv: add new p2m types and helper macros for type classification
  xen/dom0less: abstract Arm-specific p2m type name for device MMIO
    mappings
  xen/riscv: implement function to map memory in guest p2m
  xen/riscv: implement p2m_set_range()
  xen/riscv: Implement p2m_free_subtree() and related helpers
  xen/riscv: Implement p2m_pte_from_mfn() and support PBMT configuration
  xen/riscv: implement p2m_next_level()
  xen/riscv: Implement superpage splitting for p2m mappings
  xen/riscv: implement put_page()
  xen/riscv: implement mfn_valid() and page reference, ownership
    handling helpers
  xen/riscv: add support of page lookup by GFN
  xen/riscv: introduce metadata table to store P2M type

 xen/arch/arm/include/asm/p2m.h              |    5 +
 xen/arch/riscv/Makefile                     |    3 +
 xen/arch/riscv/cpufeature.c                 |    1 +
 xen/arch/riscv/include/asm/Makefile         |    1 -
 xen/arch/riscv/include/asm/cpufeature.h     |    1 +
 xen/arch/riscv/include/asm/domain.h         |   23 +
 xen/arch/riscv/include/asm/flushtlb.h       |   13 +-
 xen/arch/riscv/include/asm/mm.h             |   29 +-
 xen/arch/riscv/include/asm/p2m.h            |  183 ++-
 xen/arch/riscv/include/asm/page.h           |   38 +
 xen/arch/riscv/include/asm/paging.h         |   20 +
 xen/arch/riscv/include/asm/riscv_encoding.h |    7 +
 xen/arch/riscv/include/asm/vmid.h           |    8 +
 xen/arch/riscv/mm.c                         |   71 +-
 xen/arch/riscv/p2m.c                        | 1337 +++++++++++++++++++
 xen/arch/riscv/paging.c                     |  137 ++
 xen/arch/riscv/setup.c                      |    6 +
 xen/arch/riscv/stubs.c                      |    5 -
 xen/arch/riscv/vmid.c                       |  193 +++
 xen/common/device-tree/dom0less-build.c     |    2 +-
 20 files changed, 2058 insertions(+), 25 deletions(-)
 create mode 100644 xen/arch/riscv/include/asm/paging.h
 create mode 100644 xen/arch/riscv/include/asm/vmid.h
 create mode 100644 xen/arch/riscv/p2m.c
 create mode 100644 xen/arch/riscv/paging.c
 create mode 100644 xen/arch/riscv/vmid.c

-- 
2.51.0