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riscv: Use global mappings for kernel pages

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We map kernel pages into all addresses spages, so they can be marked as
global.  This allows hardware to avoid flushing the kernel mappings when
moving between address spaces.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
[Palmer: commit text]
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Guo Ren 2021-05-26 05:49:20 +00:00 • committed by Palmer Dabbelt
parent 7fa865f564
commit cba43c31f1
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1 changed files with 2 additions and 1 deletions
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3
arch/riscv/include/asm/pgtable.h
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@ -134,7 +134,8 @@
| _PAGE_WRITE \
| _PAGE_PRESENT \
| _PAGE_ACCESSED \
| _PAGE_DIRTY)
| _PAGE_DIRTY \
| _PAGE_GLOBAL)
#define PAGE_KERNEL __pgprot(_PAGE_KERNEL)
#define PAGE_KERNEL_READ __pgprot(_PAGE_KERNEL & ~_PAGE_WRITE)