Messages in this thread Patch in this message | | | From | Zong Li <> | Subject | [PATCH 2/8] riscv: add ARCH_HAS_SET_DIRECT_MAP support | Date | Mon, 17 Feb 2020 16:32:17 +0800 |
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Add set_direct_map_*() functions for setting the direct map alias for the page to its default permissions and to an invalid state that cannot be cached in a TLB. (See d253ca0c ("x86/mm/cpa: Add set_direct_map_*() functions")) Add a similar implementation for RISC-V.
Signed-off-by: Zong Li <zong.li@sifive.com> --- arch/riscv/Kconfig | 1 + arch/riscv/include/asm/set_memory.h | 3 +++ arch/riscv/mm/pageattr.c | 24 ++++++++++++++++++++++++ 3 files changed, 28 insertions(+)
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 76ed36543b3a..07bf1a7c0dd2 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -60,6 +60,7 @@ config RISCV select HAVE_EBPF_JIT if 64BIT select EDAC_SUPPORT select ARCH_HAS_GIGANTIC_PAGE + select ARCH_HAS_SET_DIRECT_MAP select ARCH_HAS_SET_MEMORY select ARCH_WANT_HUGE_PMD_SHARE if 64BIT select SPARSEMEM_STATIC if 32BIT diff --git a/arch/riscv/include/asm/set_memory.h b/arch/riscv/include/asm/set_memory.h index 936f08063566..a9783a878dca 100644 --- a/arch/riscv/include/asm/set_memory.h +++ b/arch/riscv/include/asm/set_memory.h @@ -14,4 +14,7 @@ int set_memory_rw(unsigned long addr, int numpages); int set_memory_x(unsigned long addr, int numpages); int set_memory_nx(unsigned long addr, int numpages); +int set_direct_map_invalid_noflush(struct page *page); +int set_direct_map_default_noflush(struct page *page); + #endif /* _ASM_RISCV_SET_MEMORY_H */ diff --git a/arch/riscv/mm/pageattr.c b/arch/riscv/mm/pageattr.c index fcd59ef2835b..7be6cd67e2ef 100644 --- a/arch/riscv/mm/pageattr.c +++ b/arch/riscv/mm/pageattr.c @@ -148,3 +148,27 @@ int set_memory_nx(unsigned long addr, int numpages) { return __set_memory(addr, numpages, __pgprot(0), __pgprot(_PAGE_EXEC)); } + +int set_direct_map_invalid_noflush(struct page *page) +{ + unsigned long start = (unsigned long)page_address(page); + unsigned long end = start + PAGE_SIZE; + struct pageattr_masks masks = { + .set_mask = __pgprot(0), + .clear_mask = __pgprot(_PAGE_PRESENT) + }; + + return walk_page_range(&init_mm, start, end, &pageattr_ops, &masks); +} + +int set_direct_map_default_noflush(struct page *page) +{ + unsigned long start = (unsigned long)page_address(page); + unsigned long end = start + PAGE_SIZE; + struct pageattr_masks masks = { + .set_mask = PAGE_KERNEL, + .clear_mask = __pgprot(0) + }; + + return walk_page_range(&init_mm, start, end, &pageattr_ops, &masks); +} -- 2.25.0
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