Alexandre Ghiti ed96b31435 riscv: Move early dtb mapping into the fixmap region ... commit ef69d2559f upstream. riscv establishes 2 virtual mappings: - early_pg_dir maps the kernel which allows to discover the system memory - swapper_pg_dir installs the final mapping (linear mapping included) We used to map the dtb in early_pg_dir using DTB_EARLY_BASE_VA, and this mapping was not carried over in swapper_pg_dir. It happens that early_init_fdt_scan_reserved_mem() must be called before swapper_pg_dir is setup otherwise we could allocate reserved memory defined in the dtb. And this function initializes reserved_mem variable with addresses that lie in the early_pg_dir dtb mapping: when those addresses are reused with swapper_pg_dir, this mapping does not exist and then we trap. The previous "fix" was incorrect as early_init_fdt_scan_reserved_mem() must be called before swapper_pg_dir is set up otherwise we could allocate in reserved memory defined in the dtb. So move the dtb mapping in the fixmap region which is established in early_pg_dir and handed over to swapper_pg_dir. This patch had to be backported because: - the documentation for sv57 is not present here (as sv48/57 are not present) Fixes: 922b0375fc ("riscv: Fix memblock reservation for device tree blob") Fixes: 8f3a2b4a96 ("RISC-V: Move DT mapping outof fixmap") Fixes: 50e63dd8ed ("riscv: fix reserved memory setup") Reported-by: Conor Dooley <conor.dooley@microchip.com> Link: https://lore.kernel.org/all/f8e67f82-103d-156c-deb0-d6d6e2756f5e@microchip.com/ Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com> Reviewed-by: Conor Dooley <conor.dooley@microchip.com> Tested-by: Conor Dooley <conor.dooley@microchip.com> Link: https://lore.kernel.org/r/20230329081932.79831-2-alexghiti@rivosinc.com Cc: stable@vger.kernel.org # 6.1.x Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-05-01 08:26:28 +09:00
..
boot-image-header.rst	RISC-V: Typo fixes in image header and documentation.	2019-12-19 09:32:45 -07:00
features.rst	docs: archis: add a per-architecture features list	2020-12-03 15:10:15 -07:00
index.rst	doc: RISC-V: Document that misaligned accesses are supported	2022-10-12 08:58:10 -07:00
patch-acceptance.rst	Documentation: riscv: add patch acceptance guidelines	2020-01-04 21:49:01 -08:00
uabi.rst	doc: RISC-V: Document that misaligned accesses are supported	2022-10-12 08:58:10 -07:00
vm-layout.rst	riscv: Move early dtb mapping into the fixmap region	2023-05-01 08:26:28 +09:00