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riscv: Introduce set_kernel_memory helper

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This helper should be used for setting permissions to the kernel
mapping as it takes pointers as arguments and then avoids explicit cast
to unsigned long needed for the set_memory_* API.

Suggested-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Jisheng Zhang <jszhang@kernel.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Alexandre Ghiti 2021-06-24 14:00:40 +02:00 committed by Palmer Dabbelt
parent 7094e6acaf
commit c10bc260e7
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1 changed files with 16 additions and 0 deletions
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16
arch/riscv/include/asm/set_memory.h
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@ -17,6 +17,16 @@ int set_memory_x(unsigned long addr, int numpages);
int set_memory_nx(unsigned long addr, int numpages);
int set_memory_rw_nx(unsigned long addr, int numpages);
void protect_kernel_text_data(void);
static __always_inline int set_kernel_memory(char *startp, char *endp,
int (*set_memory)(unsigned long start,
int num_pages))
{
unsigned long start = (unsigned long)startp;
unsigned long end = (unsigned long)endp;
int num_pages = PAGE_ALIGN(end - start) >> PAGE_SHIFT;
return set_memory(start, num_pages);
}
#else
static inline int set_memory_ro(unsigned long addr, int numpages) { return 0; }
static inline int set_memory_rw(unsigned long addr, int numpages) { return 0; }
@ -24,6 +34,12 @@ static inline int set_memory_x(unsigned long addr, int numpages) { return 0; }
static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; }
static inline void protect_kernel_text_data(void) {}
static inline int set_memory_rw_nx(unsigned long addr, int numpages) { return 0; }
static inline int set_kernel_memory(char *startp, char *endp,
int (*set_memory)(unsigned long start,
int num_pages))
{
return 0;
}
#endif
#if defined(CONFIG_64BIT) && defined(CONFIG_STRICT_KERNEL_RWX)