diff options
| author | Hari Bathini <hbathini@linux.ibm.com> | 2023-10-20 19:43:55 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2023-10-23 20:33:19 +1100 |
| commit | 6efc1675acb88eef45ef0156b93f95d66a8ee759 (patch) | |
| tree | 9e43c538e8fc92f7ffcf1ae2bcbc96c673310381 | |
| parent | 465cabc97b42405eb89380ea6ba8d8b03e4ae1a2 (diff) | |
powerpc/bpf: implement bpf_arch_text_copy
bpf_arch_text_copy is used to dump JITed binary to RX page, allowing
multiple BPF programs to share the same page. Use the newly introduced
patch_instructions() to implement it.
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Acked-by: Song Liu <song@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231020141358.643575-3-hbathini@linux.ibm.com
| -rw-r--r-- | arch/powerpc/net/bpf_jit_comp.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c index 471e37cf8e2a..c21cb88b09e4 100644 --- a/arch/powerpc/net/bpf_jit_comp.c +++ b/arch/powerpc/net/bpf_jit_comp.c @@ -13,9 +13,13 @@ #include <linux/netdevice.h> #include <linux/filter.h> #include <linux/if_vlan.h> -#include <asm/kprobes.h> +#include <linux/kernel.h> +#include <linux/memory.h> #include <linux/bpf.h> +#include <asm/kprobes.h> +#include <asm/code-patching.h> + #include "bpf_jit.h" static void bpf_jit_fill_ill_insns(void *area, unsigned int size) @@ -274,3 +278,17 @@ int bpf_add_extable_entry(struct bpf_prog *fp, u32 *image, int pass, struct code ctx->exentry_idx++; return 0; } + +void *bpf_arch_text_copy(void *dst, void *src, size_t len) +{ + int err; + + if (WARN_ON_ONCE(core_kernel_text((unsigned long)dst))) + return ERR_PTR(-EINVAL); + + mutex_lock(&text_mutex); + err = patch_instructions(dst, src, len, false); + mutex_unlock(&text_mutex); + + return err ? ERR_PTR(err) : dst; +} |