[PATCH v8 0/3] 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.

CI tests:
  https://gitlab.com/xen-project/people/olkur/xen/-/pipelines/2224311393

---
Changes in V8:
 - All patches (except last three ones) are merged to staging.
 - Addressed comments for v7.
---
Changes in V7:
 - Merged to staging:
   - xen/riscv: avoid redundant HGATP*_MODE_SHIFT and HGATP*_VMID_SHIFT
 - Introduce new patch:
   - xen/riscv: update p2m_set_entry to free unused metadata page
   (could be merged with previous one: xen/riscv: introduce metadata table to
    store P2M type )
 - Addressed comments for v6.
---
Changes in V6:
 - Addressed coment for v5.
---
Changes in V5:
 - Addressed comments for v4.
---
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 (3):
  xen/riscv: add support of page lookup by GFN
  xen/riscv: introduce metadata table to store P2M type
  xen/riscv: update p2m_set_entry() to free unused metadata pages

 xen/arch/riscv/include/asm/flushtlb.h |   2 +-
 xen/arch/riscv/include/asm/mm.h       |  21 ++
 xen/arch/riscv/include/asm/p2m.h      |  21 ++
 xen/arch/riscv/mm.c                   |  13 +
 xen/arch/riscv/p2m.c                  | 437 ++++++++++++++++++++++++--
 5 files changed, 464 insertions(+), 30 deletions(-)

-- 
2.52.0