Alexandre Ghiti 26e7aacb83 riscv: Allow to downgrade paging mode from the command line ... Add 2 early command line parameters that allow to downgrade satp mode (using the same naming as x86): - "no5lvl": use a 4-level page table (down from sv57 to sv48) - "no4lvl": use a 3-level page table (down from sv57/sv48 to sv39) Note that going through the device tree to get the kernel command line works with ACPI too since the efi stub creates a device tree anyway with the command line. In KASAN kernels, we can't use the libfdt that early in the boot process since we are not ready to execute instrumented functions. So instead of using the "generic" libfdt, we compile our own versions of those functions that are not instrumented and that are prefixed so that they do not conflict with the generic ones. We also need the non-instrumented versions of the string functions and the prefixed versions of memcpy/memmove. This is largely inspired by commit aacd149b62 ("arm64: head: avoid relocating the kernel twice for KASLR") from which I removed compilation flags that were not relevant to RISC-V at the moment (LTO, SCS). Also note that we have to link with -z norelro to avoid ld.lld to throw a warning with the new .got sections, like in commit 311bea3cb9 ("arm64: link with -z norelro for LLD or aarch64-elf"). Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com> Tested-by: Björn Töpel <bjorn@rivosinc.com> Reviewed-by: Björn Töpel <bjorn@rivosinc.com> Link: https://lore.kernel.org/r/20230424092313.178699-2-alexghiti@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>		2023-04-26 07:30:52 -07:00
..
boot	riscv: Use --emit-relocs in order to move .rela.dyn in init	2023-04-19 07:46:33 -07:00
configs	riscv: defconfig: Enable the Allwinner D1 platform and drivers	2023-01-27 23:10:08 +01:00
errata	RISC-V: hwprobe: Remove __init on probe_vendor_features()	2023-04-25 21:58:42 -07:00
include	RISC-V: hwprobe: Remove __init on probe_vendor_features()	2023-04-25 21:58:42 -07:00
kernel	riscv: Allow to downgrade paging mode from the command line	2023-04-26 07:30:52 -07:00
kvm	RISC-V: KVM: Expose Zicboz to the guest	2023-03-14 21:26:08 -07:00
lib	riscv: Allow to downgrade paging mode from the command line	2023-04-26 07:30:52 -07:00
mm	riscv: Allow to downgrade paging mode from the command line	2023-04-26 07:30:52 -07:00
net	riscv, bpf: Add bpf trampoline support for RV64	2023-02-17 21:45:30 +01:00
purgatory	RISC-V: add infrastructure to allow different str* implementations	2023-01-31 11:43:23 -08:00
tools	riscv: Check relocations at compile time	2023-04-19 07:46:32 -07:00
Kbuild	riscv: move errata/ and kvm/ builds to arch/riscv/Kbuild	2022-06-01 22:26:32 -07:00
Kconfig	Merge patch series "Introduce 64b relocatable kernel"	2023-04-19 07:47:45 -07:00
Kconfig.debug
Kconfig.errata	Merge patch series "RISC-V: Fixes for riscv_has_extension[un]likely()'s alternative dependency"	2023-03-29 12:26:38 -07:00
Kconfig.socs	RISC-V Patches for the 6.3 Merge Window, Part 1	2023-02-25 11:14:08 -08:00
Makefile	riscv: Allow to downgrade paging mode from the command line	2023-04-26 07:30:52 -07:00
Makefile.postlink	riscv: Use --emit-relocs in order to move .rela.dyn in init	2023-04-19 07:46:33 -07:00