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[v2,3/4] powerpc/bpf: implement bpf_arch_text_invalidate for bpf_prog_pack

Message ID 20230309180213.180263-4-hbathini@linux.ibm.com (mailing list archive)
State Not Applicable
Delegated to: BPF
Headers show
Series enable bpf_prog_pack allocator for powerpc | expand

Checks

Context Check Description
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bpf/vmtest-bpf-next-VM_Test-23 success Logs for test_progs_no_alu32 on x86_64 with llvm-17
netdev/tree_selection success Not a local patch, async
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bpf/vmtest-bpf-next-VM_Test-11 success Logs for test_maps on s390x with gcc
bpf/vmtest-bpf-next-PR success PR summary
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Commit Message

Hari Bathini March 9, 2023, 6:02 p.m. UTC 
Implement bpf_arch_text_invalidate and use it to fill unused part of
the bpf_prog_pack with trap instructions when a BPF program is freed.

Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
---
 arch/powerpc/net/bpf_jit_comp.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

Comments

Song Liu March 10, 2023, 10:06 p.m. UTC | #1 
On Thu, Mar 9, 2023 at 10:02 AM Hari Bathini <hbathini@linux.ibm.com> wrote:
>
> Implement bpf_arch_text_invalidate and use it to fill unused part of
> the bpf_prog_pack with trap instructions when a BPF program is freed.
>
> Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
> ---
>  arch/powerpc/net/bpf_jit_comp.c | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
>
> diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c
> index 0a70319116d1..d1794d9f0154 100644
> --- a/arch/powerpc/net/bpf_jit_comp.c
> +++ b/arch/powerpc/net/bpf_jit_comp.c
> @@ -293,3 +293,18 @@ void *bpf_arch_text_copy(void *dst, void *src, size_t len)
>
>         return ret;
>  }
> +
> +int bpf_arch_text_invalidate(void *dst, size_t len)
> +{
> +       u32 inst = BREAKPOINT_INSTRUCTION;
> +       int ret = -EINVAL;

No need to set to -EINVAL here.

> +
> +       if (WARN_ON_ONCE(core_kernel_text((unsigned long)dst)))
> +               return ret;

Just return -EINVAL instead.

> +
> +       mutex_lock(&text_mutex);
> +       ret = patch_instructions(dst, &inst, true, len);
> +       mutex_unlock(&text_mutex);
> +
> +       return ret;
> +}
> --
> 2.39.2
>
diff mbox series

Patch

diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c
index 0a70319116d1..d1794d9f0154 100644
--- a/arch/powerpc/net/bpf_jit_comp.c
+++ b/arch/powerpc/net/bpf_jit_comp.c
@@ -293,3 +293,18 @@  void *bpf_arch_text_copy(void *dst, void *src, size_t len)
 
 	return ret;
 }
+
+int bpf_arch_text_invalidate(void *dst, size_t len)
+{
+	u32 inst = BREAKPOINT_INSTRUCTION;
+	int ret = -EINVAL;
+
+	if (WARN_ON_ONCE(core_kernel_text((unsigned long)dst)))
+		return ret;
+
+	mutex_lock(&text_mutex);
+	ret = patch_instructions(dst, &inst, true, len);
+	mutex_unlock(&text_mutex);
+
+	return ret;
+}