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08 September 2024, 02:26:05 UTC
Revision 5c8405d763dc2b125b39166bc70be1b8dcc80582 authored by Stuart Menefy on 30 June 2024, 11:05:49 UTC, committed by Palmer Dabbelt on 26 July 2024, 12:50:50 UTC 
riscv: Extend sv39 linear mapping max size to 128G
 
This harmonizes all virtual addressing modes which can now all map
(PGDIR_SIZE * PTRS_PER_PGD) / 4 of physical memory.

The RISCV implementation of KASAN requires that the boundary between
shallow mappings are aligned on an 8G boundary. In this case we need
VMALLOC_START to be 8G aligned. So although we only need to move the
start of the linear mapping down by 4GiB to allow 128GiB to be mapped,
we actually move it down by 8GiB (creating a 4GiB hole between the
linear mapping and KASAN shadow space) to maintain the alignment
requirement.

Signed-off-by: Stuart Menefy <stuart.menefy@codasip.com>
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20240630110550.1731929-1-stuart.menefy@codasip.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
1 parent 3aa1a7d
History
Tip revision: 5c8405d763dc2b125b39166bc70be1b8dcc80582 authored by Stuart Menefy on 30 June 2024, 11:05:49 UTC
riscv: Extend sv39 linear mapping max size to 128G
Tip revision: 5c8405d
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