Messages in this thread | | | Date | Tue, 31 Jan 2023 16:34:26 +0100 | Subject | Re: [PATCH v4 0/1] riscv: Allow to downgrade paging mode from the command line | From | Alexandre Ghiti <> |
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Sorry, I forgot the changelog again:
|v4: - Remove the kasan limitation by compiling 'local' fdt functions, as done in arm64 by Ard - Remove RB from Björn as the cmdline handling changed v3: - Massage commit log to make no4lvl clearer, as asked by Conor - Add a note to kernel-parameters.txt regarding the impossibility to use those parameters when KASAN is enabled, as suggested by Conor - Add RB from Björn v2: - Honor CMDLINE_EXTEND and CMDLINE_FORCE as noticed by Björn|
On 1/31/23 16:11, Alexandre Ghiti wrote: > This new version gets rid of the limitation that prevented KASAN kernels > to use the newly introduced parameters. > > While looking into KASLR, I fell onto commit aacd149b6238 ("arm64: head: > avoid relocating the kernel twice for KASLR"): it allows to use the fdt > functions very early in the boot process with KASAN enabled by simply > compiling a new version of those functions without instrumentation. > > I had to change the handling of the command line parsing to make the > code self-contained in kernel/pi/cmd_early.c to avoid calling too many > __pi prefixed functions from outside this file. > > I'll use this approach like arm64 to handle the extraction of the random > seedi from the device tree for KASLR. > > @Ard: I copied the "pi" name but I have to admit I don't know what it > means. > > Alexandre Ghiti (1): > riscv: Allow to downgrade paging mode from the command line > > .../admin-guide/kernel-parameters.txt | 5 +- > arch/riscv/kernel/Makefile | 2 + > arch/riscv/kernel/pi/Makefile | 34 ++++++++++++ > arch/riscv/kernel/pi/cmdline_early.c | 52 +++++++++++++++++++ > arch/riscv/lib/memcpy.S | 2 + > arch/riscv/lib/memmove.S | 2 + > arch/riscv/mm/init.c | 36 ++++++++++--- > 7 files changed, 126 insertions(+), 7 deletions(-) > create mode 100644 arch/riscv/kernel/pi/Makefile > create mode 100644 arch/riscv/kernel/pi/cmdline_early.c >
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