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Fri, 25 Aug 2023 15:18:14 +0000 (GMT) From: Hari Bathini To: linuxppc-dev , bpf@vger.kernel.org Subject: [PATCH v3 1/5] powerpc/bpf: implement bpf_arch_text_copy Date: Fri, 25 Aug 2023 20:48:06 +0530 Message-ID: <20230825151810.164418-2-hbathini@linux.ibm.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230825151810.164418-1-hbathini@linux.ibm.com> References: <20230825151810.164418-1-hbathini@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: b8Mh2RtNzn-eY5Pab_36vKt6MD3fgUCC X-Proofpoint-ORIG-GUID: b8Mh2RtNzn-eY5Pab_36vKt6MD3fgUCC X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.957,Hydra:6.0.601,FMLib:17.11.176.26 definitions=2023-08-25_13,2023-08-25_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 clxscore=1015 phishscore=0 impostorscore=0 malwarescore=0 adultscore=0 mlxlogscore=992 spamscore=0 mlxscore=0 priorityscore=1501 bulkscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2308100000 definitions=main-2308250134 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Song Liu , Daniel Borkmann , Alexei Starovoitov , Andrii Nakryiko , "Naveen N. Rao" Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" bpf_arch_text_copy is used to dump JITed binary to RX page, allowing multiple BPF programs to share the same page. Use patch_instruction() to implement it. Signed-off-by: Hari Bathini --- arch/powerpc/net/bpf_jit_comp.c | 40 ++++++++++++++++++++++++++++++++- 1 file changed, 39 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c index 37043dfc1add..170ebf8ac0f2 100644 --- a/arch/powerpc/net/bpf_jit_comp.c +++ b/arch/powerpc/net/bpf_jit_comp.c @@ -13,9 +13,12 @@ #include #include #include -#include +#include #include +#include +#include + #include "bpf_jit.h" static void bpf_jit_fill_ill_insns(void *area, unsigned int size) @@ -23,6 +26,27 @@ static void bpf_jit_fill_ill_insns(void *area, unsigned int size) memset32(area, BREAKPOINT_INSTRUCTION, size / 4); } +/* + * Patch 'len' bytes of instructions from opcode to addr, one instruction + * at a time. Returns addr on success. ERR_PTR(-EINVAL), otherwise. + */ +static void *bpf_patch_instructions(void *addr, void *opcode, size_t len) +{ + while (len > 0) { + ppc_inst_t insn = ppc_inst_read(opcode); + int ilen = ppc_inst_len(insn); + + if (patch_instruction(addr, insn)) + return ERR_PTR(-EINVAL); + + len -= ilen; + addr = addr + ilen; + opcode = opcode + ilen; + } + + return addr; +} + int bpf_jit_emit_exit_insn(u32 *image, struct codegen_context *ctx, int tmp_reg, long exit_addr) { if (!exit_addr || is_offset_in_branch_range(exit_addr - (ctx->idx * 4))) { @@ -274,3 +298,17 @@ 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) +{ + void *ret; + + if (WARN_ON_ONCE(core_kernel_text((unsigned long)dst))) + return ERR_PTR(-EINVAL); + + mutex_lock(&text_mutex); + ret = bpf_patch_instructions(dst, src, len); + mutex_unlock(&text_mutex); + + return ret; +}