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From: Daniel Borkmann <daniel@iogearbox.net>
To: "Björn Töpel" <bjorn.topel@gmail.com>,
	ast@kernel.org, netdev@vger.kernel.org
Cc: linux-riscv@lists.infradead.org, aou@eecs.berkeley.edu,
	palmer@dabbelt.com, bpf@vger.kernel.org,
	paul.walmsley@sifive.com
Subject: Re: [PATCH bpf-next v2 6/9] riscv, bpf: provide RISC-V specific JIT image alloc/free
Date: Mon, 16 Dec 2019 16:09:53 +0100
Message-ID: <7ceab77a-92e7-6415-3045-3e16876d4ef8@iogearbox.net> (raw)
In-Reply-To: <20191216091343.23260-7-bjorn.topel@gmail.com>

On 12/16/19 10:13 AM, Björn Töpel wrote:
> 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>
> ---
>   arch/riscv/include/asm/pgtable.h |  4 ++++
>   arch/riscv/net/bpf_jit_comp.c    | 13 +++++++++++++
>   2 files changed, 17 insertions(+)
> 
> 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)
> +

Series looks good to me, thanks; I'd like to get an ACK from Palmer/others on this one.

>   /*
>    * Roughly size the vmemmap space to be large enough to fit enough
>    * struct pages to map half the virtual address space. Then
> diff --git a/arch/riscv/net/bpf_jit_comp.c b/arch/riscv/net/bpf_jit_comp.c
> index 8aa19c846881..46cff093f526 100644
> --- a/arch/riscv/net/bpf_jit_comp.c
> +++ b/arch/riscv/net/bpf_jit_comp.c
> @@ -1656,3 +1656,16 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
>   					   tmp : orig_prog);
>   	return prog;
>   }
> +
> +void *bpf_jit_alloc_exec(unsigned long size)
> +{
> +	return __vmalloc_node_range(size, PAGE_SIZE, BPF_JIT_REGION_START,
> +				    BPF_JIT_REGION_END, GFP_KERNEL,
> +				    PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE,
> +				    __builtin_return_address(0));
> +}
> +
> +void bpf_jit_free_exec(void *addr)
> +{
> +	return vfree(addr);
> +}
> 



  reply index

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-16  9:13 [PATCH bpf-next v2 0/9] riscv: BPF JIT fix, optimizations and far jumps support Björn Töpel
2019-12-16  9:13 ` [PATCH bpf-next v2 1/9] riscv, bpf: fix broken BPF tail calls Björn Töpel
2019-12-16  9:13 ` [PATCH bpf-next v2 2/9] riscv, bpf: add support for far branching Björn Töpel
2019-12-16  9:13 ` [PATCH bpf-next v2 3/9] riscv, bpf: add support for far branching when emitting tail call Björn Töpel
2019-12-16  9:13 ` [PATCH bpf-next v2 4/9] riscv, bpf: add support for far jumps and exits Björn Töpel
2019-12-16  9:13 ` [PATCH bpf-next v2 5/9] riscv, bpf: optimize BPF tail calls Björn Töpel
2019-12-16  9:13 ` [PATCH bpf-next v2 6/9] riscv, bpf: provide RISC-V specific JIT image alloc/free Björn Töpel
2019-12-16 15:09   ` Daniel Borkmann [this message]
2019-12-18  6:23     ` Björn Töpel
2020-01-04  1:32       ` Paul Walmsley
2020-01-07 10:24         ` Björn Töpel
2020-01-07 10:47           ` Paul Walmsley
2020-02-02 13:37   ` Alex Ghiti
2020-02-03 12:28     ` Björn Töpel
2020-02-03 20:57       ` Alex Ghiti
2019-12-16  9:13 ` [PATCH bpf-next v2 7/9] riscv, bpf: optimize calls Björn Töpel
2019-12-16  9:13 ` [PATCH bpf-next v2 8/9] riscv, bpf: add missing uapi header for BPF_PROG_TYPE_PERF_EVENT programs Björn Töpel
2019-12-16  9:13 ` [PATCH bpf-next v2 9/9] riscv, perf: add arch specific perf_arch_bpf_user_pt_regs Björn Töpel
2019-12-19 15:07 ` [PATCH bpf-next v2 0/9] riscv: BPF JIT fix, optimizations and far jumps support Daniel Borkmann
2019-12-19 22:02 ` [PATCH bpf-next v2 1/9] riscv, bpf: fix broken BPF tail calls Palmer Dabbelt
2019-12-23 18:03 ` [PATCH bpf-next v2 2/9] riscv, bpf: add support for far branching Palmer Dabbelt
2020-01-07  8:13   ` Björn Töpel
2020-01-23  2:08   ` Palmer Dabbelt
2019-12-23 18:18 ` [PATCH bpf-next v2 3/9] riscv, bpf: add support for far branching when emitting tail call Palmer Dabbelt
2019-12-23 18:18 ` [PATCH bpf-next v2 4/9] riscv, bpf: add support for far jumps and exits Palmer Dabbelt
2019-12-23 18:29 ` [PATCH bpf-next v2 5/9] riscv, bpf: optimize BPF tail calls Palmer Dabbelt
2019-12-23 18:30 ` [PATCH bpf-next v2 6/9] riscv, bpf: provide RISC-V specific JIT image alloc/free Palmer Dabbelt
2019-12-23 18:58 ` [PATCH bpf-next v2 7/9] riscv, bpf: optimize calls Palmer Dabbelt
2020-01-07 10:14   ` Björn Töpel
2020-01-28  2:15   ` Palmer Dabbelt
2020-02-03 12:11     ` Björn Töpel
2019-12-23 18:58 ` [PATCH bpf-next v2 8/9] riscv, bpf: add missing uapi header for BPF_PROG_TYPE_PERF_EVENT programs Palmer Dabbelt
2019-12-23 18:58 ` [PATCH bpf-next v2 9/9] riscv, perf: add arch specific perf_arch_bpf_user_pt_regs Palmer Dabbelt

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