On Mon, Sep 18, 2023 at 10:29:49AM +0300, Mike Rapoport wrote:
> From: "Mike Rapoport (IBM)" <r...@kernel.org>
>
> The memory allocations for kprobes and BPF on arm64 can be placed
> anywhere in vmalloc address space and currently this is implemented with
> overrides of alloc_insn_page() and bpf_jit_alloc_exec() in arm64.
>
> Define EXECMEM_KPROBES and EXECMEM_BPF ranges in arm64::execmem_params and
> drop overrides of alloc_insn_page() and bpf_jit_alloc_exec().
>
> Signed-off-by: Mike Rapoport (IBM) <r...@kernel.org>
> ---
> arch/arm64/kernel/module.c | 13 +++++++++++++
> arch/arm64/kernel/probes/kprobes.c | 7 -------
> arch/arm64/net/bpf_jit_comp.c | 11 -----------
> 3 files changed, 13 insertions(+), 18 deletions(-)
>
> diff --git a/arch/arm64/kernel/module.c b/arch/arm64/kernel/module.c
> index cd6320de1c54..d27db168d2a2 100644
> --- a/arch/arm64/kernel/module.c
> +++ b/arch/arm64/kernel/module.c
> @@ -116,6 +116,16 @@ static struct execmem_params execmem_params
> __ro_after_init = {
> .flags = EXECMEM_KASAN_SHADOW,
> .alignment = MODULE_ALIGN,
> },
> + [EXECMEM_KPROBES] = {
> + .start = VMALLOC_START,
> + .end = VMALLOC_END,
> + .alignment = 1,
> + },
> + [EXECMEM_BPF] = {
> + .start = VMALLOC_START,
> + .end = VMALLOC_END,
> + .alignment = 1,
> + },
> },
> };
>
> @@ -140,6 +150,9 @@ struct execmem_params __init *execmem_arch_params(void)
> r->end = module_plt_base + SZ_2G;
> }
>
> + execmem_params.ranges[EXECMEM_KPROBES].pgprot = PAGE_KERNEL_ROX;
> + execmem_params.ranges[EXECMEM_BPF].pgprot = PAGE_KERNEL;
> +
> return &execmem_params;
> }
>
> diff --git a/arch/arm64/kernel/probes/kprobes.c
> b/arch/arm64/kernel/probes/kprobes.c
> index 70b91a8c6bb3..6fccedd02b2a 100644
> --- a/arch/arm64/kernel/probes/kprobes.c
> +++ b/arch/arm64/kernel/probes/kprobes.c
> @@ -129,13 +129,6 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p)
> return 0;
> }
>
> -void *alloc_insn_page(void)
> -{
> - return __vmalloc_node_range(PAGE_SIZE, 1, VMALLOC_START, VMALLOC_END,
> - GFP_KERNEL, PAGE_KERNEL_ROX, VM_FLUSH_RESET_PERMS,
> - NUMA_NO_NODE, __builtin_return_address(0));
> -}
It's slightly curious that we didn't clear the tag here, so it's nice that
it all happens magically with your series:
Acked-by: Will Deacon <w...@kernel.org>
Will
