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riscv: Only extend kernel reservation if mapped read-only

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When the kernel mapping was moved outside of the linear mapping, the
kernel memory reservation was increased, to take into account mapping
granularity.  However, this is done unconditionally, regardless of
whether the kernel memory is mapped read-only or not.

If this extension is not needed, up to 2 MiB may be lost, which has a
big impact on e.g. Canaan K210 (64-bit nommu) platforms with only 8 MiB
of RAM.

Reclaim the lost memory by only extending the reserved region when
needed, i.e. depending on a simplified version of the conditional logic
around the call to protect_kernel_linear_mapping_text_rodata().

Fixes: 2bfc6cd81b ("riscv: Move kernel mapping outside of linear mapping")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Alexandre Ghiti <alex@ghiti.fr>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Geert Uytterhoeven 2021-04-29 17:05:00 +02:00 committed by Palmer Dabbelt
parent 939b7cbc00
commit 8db6f937f4
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1 changed files with 7 additions and 2 deletions
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9
arch/riscv/mm/init.c
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@ -135,11 +135,16 @@ void __init setup_bootmem(void)
/*
* Reserve from the start of the kernel to the end of the kernel
* and make sure we align the reservation on PMD_SIZE since we will
*/
#if defined(CONFIG_64BIT) && defined(CONFIG_STRICT_KERNEL_RWX)
/*
* Make sure we align the reservation on PMD_SIZE since we will
* map the kernel in the linear mapping as read-only: we do not want
* any allocation to happen between _end and the next pmd aligned page.
*/
memblock_reserve(vmlinux_start, (vmlinux_end - vmlinux_start + PMD_SIZE - 1) & PMD_MASK);
vmlinux_end = (vmlinux_end + PMD_SIZE - 1) & PMD_MASK;
#endif
memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
/*
* memblock allocator is not aware of the fact that last 4K bytes of