[PATCH v2 0/3] Setup memory management for RISC-V

[Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>]

Finish initializing the memory subsystem by mapping the direct map and
frame table.
In the case of RISC-V 64, which has a large virtual address space
(the minimum supported MMU mode is Sv39, providing TB of VA space),
so frame table is mapped starting from physical address
0 to ram_end.
This simplifies the calculations and thereby improves performance for
page_to_mfn(), mfn_to_page() as there is no frametable_base_pdx or
frametable_base_mfn ( if CONFIG_PDX_COMPRESSION=n).
XENHEAP_VIRT_START is introduced which is equal to directmap_virt_start which
is aligned with ram start to have superpages mapping and reduce pressure only
TLB.
In addition, initialize the VMAP_DEFAULT region, finalize the boot allocator,
and update the system state from early_boot to boot.

Introduce share_xen_page_with_guest() to deal with linkage error:
  riscv64-linux-gnu-ld: prelink.o: in function `tasklet_kill':
  /build/xen/common/tasklet.c:176: undefined reference to
     `share_xen_page_with_guest'
  riscv64-linux-gnu-ld: ./.xen-syms.0: hidden symbol `share_xen_page_with_guest'
    isn't defined riscv64-linux-gnu-ld: final link failed: bad value

The function maddr_to_virt() is introduced as part of this patch series, as
setup_directmap_mappings() uses it indirectly through mfn_to_virt().

virt_to_maddr() is updated as it is started to use XENHEAP_VIRT_START which is
introduced in this patch series.

---
Changes in V2:
 - update the cover letter message.
 - merge first 3 patches to "introduce setup_mm()" patch as after setup_mm()
   rework all the things in first two patches of v1 started to use changes
   introduced in "introduce setup_mm()" patch.
 - add Acked-by for some patch series.
 - All other details please look at the specific patch.
---

Oleksii Kurochko (3):
  xen/riscv: introduce setup_mm()
  xen/riscv: initialize the VMAP_DEFAULT virtual range
  xen/riscv: finalize boot allocator and transition to boot state

 xen/arch/riscv/include/asm/config.h |   1 +
 xen/arch/riscv/include/asm/mm.h     |  13 ++-
 xen/arch/riscv/include/asm/setup.h  |   2 +
 xen/arch/riscv/mm.c                 | 132 ++++++++++++++++++++++++++--
 xen/arch/riscv/pt.c                 |   6 ++
 xen/arch/riscv/setup.c              |  14 +++
 xen/arch/riscv/stubs.c              |  10 +++
 7 files changed, 168 insertions(+), 10 deletions(-)

-- 
2.47.0