diff options
| author | Björn Töpel <bjorn.topel@gmail.com> | 2019-12-16 10:13:40 +0100 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2019-12-19 16:03:31 +0100 |
| commit | 7f3631e88ee6fb13beac333a0e9e605d2414d17f (patch) | |
| tree | 83de14e24c5f18b8d1197c815df60556471a37f6 /arch/riscv/include | |
| parent | fe8322b866d560a3b3535ed9aa49df59809decbe (diff) | |
| download | linux-7f3631e88ee6fb13beac333a0e9e605d2414d17f.tar.bz2 | |
riscv, bpf: Provide RISC-V specific JIT image alloc/free
This commit makes sure that the JIT images is kept close to the kernel
text, so BPF calls can use relative calling with auipc/jalr or jal
instead of loading the full 64-bit address and jalr.
The BPF JIT image region is 128 MB before the kernel text.
Signed-off-by: Björn Töpel <bjorn.topel@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20191216091343.23260-7-bjorn.topel@gmail.com
Diffstat (limited to 'arch/riscv/include')
| -rw-r--r-- | arch/riscv/include/asm/pgtable.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index 7ff0ed4f292e..cc3f49415620 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -404,6 +404,10 @@ static inline int ptep_clear_flush_young(struct vm_area_struct *vma, #define VMALLOC_END (PAGE_OFFSET - 1) #define VMALLOC_START (PAGE_OFFSET - VMALLOC_SIZE) +#define BPF_JIT_REGION_SIZE (SZ_128M) +#define BPF_JIT_REGION_START (PAGE_OFFSET - BPF_JIT_REGION_SIZE) +#define BPF_JIT_REGION_END (VMALLOC_END) + /* * Roughly size the vmemmap space to be large enough to fit enough * struct pages to map half the virtual address space. Then |