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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; +} From patchwork Fri Aug 25 15:18:07 2023 Content-Type: text/plain; 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Fri, 25 Aug 2023 15:18:17 +0000 (GMT) From: Hari Bathini To: linuxppc-dev , bpf@vger.kernel.org Subject: [PATCH v3 2/5] powerpc/bpf: implement bpf_arch_text_invalidate for bpf_prog_pack Date: Fri, 25 Aug 2023 20:48:07 +0530 Message-ID: <20230825151810.164418-3-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: w69WJ_0l5yW4enckGL6WzcUSANwOpf9T X-Proofpoint-ORIG-GUID: w69WJ_0l5yW4enckGL6WzcUSANwOpf9T 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 malwarescore=0 mlxlogscore=938 phishscore=0 bulkscore=0 priorityscore=1501 lowpriorityscore=0 adultscore=0 spamscore=0 impostorscore=0 clxscore=1015 mlxscore=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" 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 --- arch/powerpc/net/bpf_jit_comp.c | 22 +++++++++++++++++++--- 1 file changed, 19 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c index 170ebf8ac0f2..7cd4cf53d61c 100644 --- a/arch/powerpc/net/bpf_jit_comp.c +++ b/arch/powerpc/net/bpf_jit_comp.c @@ -30,7 +30,7 @@ static void bpf_jit_fill_ill_insns(void *area, unsigned int size) * 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) +static void *bpf_patch_instructions(void *addr, void *opcode, size_t len, bool fill_insn) { while (len > 0) { ppc_inst_t insn = ppc_inst_read(opcode); @@ -41,7 +41,8 @@ static void *bpf_patch_instructions(void *addr, void *opcode, size_t len) len -= ilen; addr = addr + ilen; - opcode = opcode + ilen; + if (!fill_insn) + opcode = opcode + ilen; } return addr; @@ -307,7 +308,22 @@ void *bpf_arch_text_copy(void *dst, void *src, size_t len) return ERR_PTR(-EINVAL); mutex_lock(&text_mutex); - ret = bpf_patch_instructions(dst, src, len); + ret = bpf_patch_instructions(dst, src, len, false); + mutex_unlock(&text_mutex); + + return ret; +} + +int bpf_arch_text_invalidate(void *dst, size_t len) +{ + u32 insn = BREAKPOINT_INSTRUCTION; + int ret; + + if (WARN_ON_ONCE(core_kernel_text((unsigned long)dst))) + return -EINVAL; + + mutex_lock(&text_mutex); + ret = IS_ERR(bpf_patch_instructions(dst, &insn, len, true)); 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Fri, 25 Aug 2023 15:18:19 +0000 (GMT) From: Hari Bathini To: linuxppc-dev , bpf@vger.kernel.org Subject: [PATCH v3 3/5] powerpc/bpf: use bpf_jit_binary_pack_[alloc|finalize|free] Date: Fri, 25 Aug 2023 20:48:08 +0530 Message-ID: <20230825151810.164418-4-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: tOhpBRY7cfgmApMakPcjrxsT_Y-p-691 X-Proofpoint-ORIG-GUID: tOhpBRY7cfgmApMakPcjrxsT_Y-p-691 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 impostorscore=0 clxscore=1015 lowpriorityscore=0 malwarescore=0 bulkscore=0 adultscore=0 suspectscore=0 spamscore=0 priorityscore=1501 mlxscore=0 phishscore=0 mlxlogscore=999 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" Use bpf_jit_binary_pack_alloc in powerpc jit. The jit engine first writes the program to the rw buffer. When the jit is done, the program is copied to the final location with bpf_jit_binary_pack_finalize. With multiple jit_subprogs, bpf_jit_free is called on some subprograms that haven't got bpf_jit_binary_pack_finalize() yet. Implement custom bpf_jit_free() like in commit 1d5f82d9dd47 ("bpf, x86: fix freeing of not-finalized bpf_prog_pack") to call bpf_jit_binary_pack_finalize(), if necessary. While here, correct the misnomer powerpc64_jit_data to powerpc_jit_data as it is meant for both ppc32 and ppc64. Signed-off-by: Hari Bathini --- arch/powerpc/net/bpf_jit.h | 12 ++-- arch/powerpc/net/bpf_jit_comp.c | 110 ++++++++++++++++++++++-------- arch/powerpc/net/bpf_jit_comp32.c | 13 ++-- arch/powerpc/net/bpf_jit_comp64.c | 10 +-- 4 files changed, 98 insertions(+), 47 deletions(-) diff --git a/arch/powerpc/net/bpf_jit.h b/arch/powerpc/net/bpf_jit.h index 72b7bb34fade..02bd89aa8ea5 100644 --- a/arch/powerpc/net/bpf_jit.h +++ b/arch/powerpc/net/bpf_jit.h @@ -36,9 +36,6 @@ EMIT(PPC_RAW_BRANCH(offset)); \ } while (0) -/* bl (unconditional 'branch' with link) */ -#define PPC_BL(dest) EMIT(PPC_RAW_BL((dest) - (unsigned long)(image + ctx->idx))) - /* "cond" here covers BO:BI fields. */ #define PPC_BCC_SHORT(cond, dest) \ do { \ @@ -169,16 +166,17 @@ static inline void bpf_clear_seen_register(struct codegen_context *ctx, int i) } void bpf_jit_init_reg_mapping(struct codegen_context *ctx); -int bpf_jit_emit_func_call_rel(u32 *image, struct codegen_context *ctx, u64 func); -int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *ctx, +int bpf_jit_emit_func_call_rel(u32 *image, u32 *fimage, struct codegen_context *ctx, u64 func); +int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, u32 *fimage, struct codegen_context *ctx, u32 *addrs, int pass, bool extra_pass); void bpf_jit_build_prologue(u32 *image, struct codegen_context *ctx); void bpf_jit_build_epilogue(u32 *image, struct codegen_context *ctx); void bpf_jit_realloc_regs(struct codegen_context *ctx); int bpf_jit_emit_exit_insn(u32 *image, struct codegen_context *ctx, int tmp_reg, long exit_addr); -int bpf_add_extable_entry(struct bpf_prog *fp, u32 *image, int pass, struct codegen_context *ctx, - int insn_idx, int jmp_off, int dst_reg); +int bpf_add_extable_entry(struct bpf_prog *fp, u32 *image, u32 *fimage, int pass, + struct codegen_context *ctx, int insn_idx, + int jmp_off, int dst_reg); #endif diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c index 7cd4cf53d61c..c60d7570e05d 100644 --- a/arch/powerpc/net/bpf_jit_comp.c +++ b/arch/powerpc/net/bpf_jit_comp.c @@ -64,10 +64,13 @@ int bpf_jit_emit_exit_insn(u32 *image, struct codegen_context *ctx, int tmp_reg, return 0; } -struct powerpc64_jit_data { - struct bpf_binary_header *header; +struct powerpc_jit_data { + /* address of rw header */ + struct bpf_binary_header *hdr; + /* address of ro final header */ + struct bpf_binary_header *fhdr; u32 *addrs; - u8 *image; + u8 *fimage; u32 proglen; struct codegen_context ctx; }; @@ -84,15 +87,18 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp) u8 *image = NULL; u32 *code_base; u32 *addrs; - struct powerpc64_jit_data *jit_data; + struct powerpc_jit_data *jit_data; struct codegen_context cgctx; int pass; int flen; - struct bpf_binary_header *bpf_hdr; + struct bpf_binary_header *fhdr = NULL; + struct bpf_binary_header *hdr = NULL; struct bpf_prog *org_fp = fp; struct bpf_prog *tmp_fp; bool bpf_blinded = false; bool extra_pass = false; + u8 *fimage = NULL; + u32 *fcode_base; u32 extable_len; u32 fixup_len; @@ -122,9 +128,16 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp) addrs = jit_data->addrs; if (addrs) { cgctx = jit_data->ctx; - image = jit_data->image; - bpf_hdr = jit_data->header; + /* + * JIT compiled to a writable location (image/code_base) first. + * It is then moved to the readonly final location (fimage/fcode_base) + * using instruction patching. + */ + fimage = jit_data->fimage; + fhdr = jit_data->fhdr; proglen = jit_data->proglen; + hdr = jit_data->hdr; + image = (void *)hdr + ((void *)fimage - (void *)fhdr); extra_pass = true; /* During extra pass, ensure index is reset before repopulating extable entries */ cgctx.exentry_idx = 0; @@ -144,7 +157,7 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp) cgctx.stack_size = round_up(fp->aux->stack_depth, 16); /* Scouting faux-generate pass 0 */ - if (bpf_jit_build_body(fp, 0, &cgctx, addrs, 0, false)) { + if (bpf_jit_build_body(fp, NULL, NULL, &cgctx, addrs, 0, false)) { /* We hit something illegal or unsupported. */ fp = org_fp; goto out_addrs; @@ -159,7 +172,7 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp) */ if (cgctx.seen & SEEN_TAILCALL || !is_offset_in_branch_range((long)cgctx.idx * 4)) { cgctx.idx = 0; - if (bpf_jit_build_body(fp, 0, &cgctx, addrs, 0, false)) { + if (bpf_jit_build_body(fp, NULL, NULL, &cgctx, addrs, 0, false)) { fp = org_fp; goto out_addrs; } @@ -181,17 +194,19 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp) proglen = cgctx.idx * 4; alloclen = proglen + FUNCTION_DESCR_SIZE + fixup_len + extable_len; - bpf_hdr = bpf_jit_binary_alloc(alloclen, &image, 4, bpf_jit_fill_ill_insns); - if (!bpf_hdr) { + fhdr = bpf_jit_binary_pack_alloc(alloclen, &fimage, 4, &hdr, &image, + bpf_jit_fill_ill_insns); + if (!fhdr) { fp = org_fp; goto out_addrs; } if (extable_len) - fp->aux->extable = (void *)image + FUNCTION_DESCR_SIZE + proglen + fixup_len; + fp->aux->extable = (void *)fimage + FUNCTION_DESCR_SIZE + proglen + fixup_len; skip_init_ctx: code_base = (u32 *)(image + FUNCTION_DESCR_SIZE); + fcode_base = (u32 *)(fimage + FUNCTION_DESCR_SIZE); /* Code generation passes 1-2 */ for (pass = 1; pass < 3; pass++) { @@ -199,8 +214,10 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp) cgctx.idx = 0; cgctx.alt_exit_addr = 0; bpf_jit_build_prologue(code_base, &cgctx); - if (bpf_jit_build_body(fp, code_base, &cgctx, addrs, pass, extra_pass)) { - bpf_jit_binary_free(bpf_hdr); + if (bpf_jit_build_body(fp, code_base, fcode_base, &cgctx, addrs, pass, + extra_pass)) { + bpf_arch_text_copy(&fhdr->size, &hdr->size, sizeof(hdr->size)); + bpf_jit_binary_pack_free(fhdr, hdr); fp = org_fp; goto out_addrs; } @@ -220,17 +237,19 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp) #ifdef CONFIG_PPC64_ELF_ABI_V1 /* Function descriptor nastiness: Address + TOC */ - ((u64 *)image)[0] = (u64)code_base; + ((u64 *)image)[0] = (u64)fcode_base; ((u64 *)image)[1] = local_paca->kernel_toc; #endif - fp->bpf_func = (void *)image; + fp->bpf_func = (void *)fimage; fp->jited = 1; fp->jited_len = proglen + FUNCTION_DESCR_SIZE; - bpf_flush_icache(bpf_hdr, (u8 *)bpf_hdr + bpf_hdr->size); if (!fp->is_func || extra_pass) { - bpf_jit_binary_lock_ro(bpf_hdr); + if (bpf_jit_binary_pack_finalize(fp, fhdr, hdr)) { + fp = org_fp; + goto out_addrs; + } bpf_prog_fill_jited_linfo(fp, addrs); out_addrs: kfree(addrs); @@ -240,8 +259,9 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp) jit_data->addrs = addrs; jit_data->ctx = cgctx; jit_data->proglen = proglen; - jit_data->image = image; - jit_data->header = bpf_hdr; + jit_data->fimage = fimage; + jit_data->fhdr = fhdr; + jit_data->hdr = hdr; } out: @@ -255,12 +275,13 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp) * The caller should check for (BPF_MODE(code) == BPF_PROBE_MEM) before calling * this function, as this only applies to BPF_PROBE_MEM, for now. */ -int bpf_add_extable_entry(struct bpf_prog *fp, u32 *image, int pass, struct codegen_context *ctx, - int insn_idx, int jmp_off, int dst_reg) +int bpf_add_extable_entry(struct bpf_prog *fp, u32 *image, u32 *fimage, int pass, + struct codegen_context *ctx, int insn_idx, int jmp_off, + int dst_reg) { off_t offset; unsigned long pc; - struct exception_table_entry *ex; + struct exception_table_entry *ex, *ex_entry; u32 *fixup; /* Populate extable entries only in the last pass */ @@ -271,9 +292,16 @@ int bpf_add_extable_entry(struct bpf_prog *fp, u32 *image, int pass, struct code WARN_ON_ONCE(ctx->exentry_idx >= fp->aux->num_exentries)) return -EINVAL; + /* + * Program is first written to image before copying to the + * final location (fimage). Accordingly, update in the image first. + * As all offsets used are relative, copying as is to the + * final location should be alright. + */ pc = (unsigned long)&image[insn_idx]; + ex = (void *)fp->aux->extable - (void *)fimage + (void *)image; - fixup = (void *)fp->aux->extable - + fixup = (void *)ex - (fp->aux->num_exentries * BPF_FIXUP_LEN * 4) + (ctx->exentry_idx * BPF_FIXUP_LEN * 4); @@ -284,17 +312,17 @@ int bpf_add_extable_entry(struct bpf_prog *fp, u32 *image, int pass, struct code fixup[BPF_FIXUP_LEN - 1] = PPC_RAW_BRANCH((long)(pc + jmp_off) - (long)&fixup[BPF_FIXUP_LEN - 1]); - ex = &fp->aux->extable[ctx->exentry_idx]; + ex_entry = &ex[ctx->exentry_idx]; - offset = pc - (long)&ex->insn; + offset = pc - (long)&ex_entry->insn; if (WARN_ON_ONCE(offset >= 0 || offset < INT_MIN)) return -ERANGE; - ex->insn = offset; + ex_entry->insn = offset; - offset = (long)fixup - (long)&ex->fixup; + offset = (long)fixup - (long)&ex_entry->fixup; if (WARN_ON_ONCE(offset >= 0 || offset < INT_MIN)) return -ERANGE; - ex->fixup = offset; + ex_entry->fixup = offset; ctx->exentry_idx++; return 0; @@ -328,3 +356,27 @@ int bpf_arch_text_invalidate(void *dst, size_t len) return ret; } + +void bpf_jit_free(struct bpf_prog *fp) +{ + if (fp->jited) { + struct powerpc_jit_data *jit_data = fp->aux->jit_data; + struct bpf_binary_header *hdr; + + /* + * If we fail the final pass of JIT (from jit_subprogs), + * the program may not be finalized yet. Call finalize here + * before freeing it. + */ + if (jit_data) { + bpf_jit_binary_pack_finalize(fp, jit_data->fhdr, jit_data->hdr); + kvfree(jit_data->addrs); + kfree(jit_data); + } + hdr = bpf_jit_binary_pack_hdr(fp); + bpf_jit_binary_pack_free(hdr, NULL); + WARN_ON_ONCE(!bpf_prog_kallsyms_verify_off(fp)); + } + + bpf_prog_unlock_free(fp); +} diff --git a/arch/powerpc/net/bpf_jit_comp32.c b/arch/powerpc/net/bpf_jit_comp32.c index 7f91ea064c08..434417c755fd 100644 --- a/arch/powerpc/net/bpf_jit_comp32.c +++ b/arch/powerpc/net/bpf_jit_comp32.c @@ -200,12 +200,13 @@ void bpf_jit_build_epilogue(u32 *image, struct codegen_context *ctx) EMIT(PPC_RAW_BLR()); } -int bpf_jit_emit_func_call_rel(u32 *image, struct codegen_context *ctx, u64 func) +/* Relative offset needs to be calculated based on final image location */ +int bpf_jit_emit_func_call_rel(u32 *image, u32 *fimage, struct codegen_context *ctx, u64 func) { - s32 rel = (s32)func - (s32)(image + ctx->idx); + s32 rel = (s32)func - (s32)(fimage + ctx->idx); if (image && rel < 0x2000000 && rel >= -0x2000000) { - PPC_BL(func); + EMIT(PPC_RAW_BL(rel)); } else { /* Load function address into r0 */ EMIT(PPC_RAW_LIS(_R0, IMM_H(func))); @@ -278,7 +279,7 @@ static int bpf_jit_emit_tail_call(u32 *image, struct codegen_context *ctx, u32 o } /* Assemble the body code between the prologue & epilogue */ -int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *ctx, +int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, u32 *fimage, struct codegen_context *ctx, u32 *addrs, int pass, bool extra_pass) { const struct bpf_insn *insn = fp->insnsi; @@ -997,7 +998,7 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context * jmp_off += 4; } - ret = bpf_add_extable_entry(fp, image, pass, ctx, insn_idx, + ret = bpf_add_extable_entry(fp, image, fimage, pass, ctx, insn_idx, jmp_off, dst_reg); if (ret) return ret; @@ -1053,7 +1054,7 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context * EMIT(PPC_RAW_STW(bpf_to_ppc(BPF_REG_5), _R1, 12)); } - ret = bpf_jit_emit_func_call_rel(image, ctx, func_addr); + ret = bpf_jit_emit_func_call_rel(image, fimage, ctx, func_addr); if (ret) return ret; diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_comp64.c index 0f8048f6dad6..79f23974a320 100644 --- a/arch/powerpc/net/bpf_jit_comp64.c +++ b/arch/powerpc/net/bpf_jit_comp64.c @@ -240,7 +240,7 @@ static int bpf_jit_emit_func_call_hlp(u32 *image, struct codegen_context *ctx, u return 0; } -int bpf_jit_emit_func_call_rel(u32 *image, struct codegen_context *ctx, u64 func) +int bpf_jit_emit_func_call_rel(u32 *image, u32 *fimage, struct codegen_context *ctx, u64 func) { unsigned int i, ctx_idx = ctx->idx; @@ -361,7 +361,7 @@ asm ( ); /* Assemble the body code between the prologue & epilogue */ -int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *ctx, +int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, u32 *fimage, struct codegen_context *ctx, u32 *addrs, int pass, bool extra_pass) { enum stf_barrier_type stf_barrier = stf_barrier_type_get(); @@ -940,8 +940,8 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context * addrs[++i] = ctx->idx * 4; if (BPF_MODE(code) == BPF_PROBE_MEM) { - ret = bpf_add_extable_entry(fp, image, pass, ctx, ctx->idx - 1, - 4, dst_reg); + ret = bpf_add_extable_entry(fp, image, fimage, pass, ctx, + ctx->idx - 1, 4, dst_reg); if (ret) return ret; } @@ -995,7 +995,7 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context * if (func_addr_fixed) ret = bpf_jit_emit_func_call_hlp(image, ctx, func_addr); else - ret = bpf_jit_emit_func_call_rel(image, ctx, func_addr); + ret = bpf_jit_emit_func_call_rel(image, fimage, ctx, func_addr); if (ret) return ret; From patchwork Fri Aug 25 15:18:09 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hari Bathini X-Patchwork-Id: 1826197 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; 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Fri, 25 Aug 2023 15:18:26 GMT Received: from smtprelay01.fra02v.mail.ibm.com ([9.218.2.227]) by ppma23.wdc07v.mail.ibm.com (PPS) with ESMTPS id 3sn20t0k74-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 25 Aug 2023 15:18:26 +0000 Received: from smtpav04.fra02v.mail.ibm.com (smtpav04.fra02v.mail.ibm.com [10.20.54.103]) by smtprelay01.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 37PFIOZI20251356 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 25 Aug 2023 15:18:24 GMT Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8BEE220043; Fri, 25 Aug 2023 15:18:24 +0000 (GMT) Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 80CC220040; Fri, 25 Aug 2023 15:18:22 +0000 (GMT) Received: from li-bd3f974c-2712-11b2-a85c-df1cec4d728e.ibm.com.com (unknown [9.43.75.97]) by smtpav04.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 25 Aug 2023 15:18:22 +0000 (GMT) From: Hari Bathini To: linuxppc-dev , bpf@vger.kernel.org Subject: [PATCH v3 4/5] powerpc/code-patching: introduce patch_instructions() Date: Fri, 25 Aug 2023 20:48:09 +0530 Message-ID: <20230825151810.164418-5-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: 2ojPeD5syQ5h0JKvYFBs3YOUuQaKJ7Ry X-Proofpoint-ORIG-GUID: 2ojPeD5syQ5h0JKvYFBs3YOUuQaKJ7Ry 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=697 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" patch_instruction() entails setting up pte, patching the instruction, clearing the pte and flushing the tlb. If multiple instructions need to be patched, every instruction would have to go through the above drill unnecessarily. Instead, introduce function patch_instructions() that sets up the pte, clears the pte and flushes the tlb only once per page range of instructions to be patched. This adds a slight overhead to patch_instruction() call while improving the patching time for scenarios where more than one instruction needs to be patched. Signed-off-by: Hari Bathini --- arch/powerpc/include/asm/code-patching.h | 1 + arch/powerpc/lib/code-patching.c | 94 ++++++++++++++++++++---- 2 files changed, 80 insertions(+), 15 deletions(-) diff --git a/arch/powerpc/include/asm/code-patching.h b/arch/powerpc/include/asm/code-patching.h index 3f881548fb61..4f5f0c091586 100644 --- a/arch/powerpc/include/asm/code-patching.h +++ b/arch/powerpc/include/asm/code-patching.h @@ -74,6 +74,7 @@ int create_cond_branch(ppc_inst_t *instr, const u32 *addr, int patch_branch(u32 *addr, unsigned long target, int flags); int patch_instruction(u32 *addr, ppc_inst_t instr); int raw_patch_instruction(u32 *addr, ppc_inst_t instr); +int patch_instructions(void *addr, void *code, size_t len, bool fill_insn); static inline unsigned long patch_site_addr(s32 *site) { diff --git a/arch/powerpc/lib/code-patching.c b/arch/powerpc/lib/code-patching.c index b00112d7ad46..60d446e16b42 100644 --- a/arch/powerpc/lib/code-patching.c +++ b/arch/powerpc/lib/code-patching.c @@ -278,20 +278,25 @@ static void unmap_patch_area(unsigned long addr) flush_tlb_kernel_range(addr, addr + PAGE_SIZE); } -static int __do_patch_instruction_mm(u32 *addr, ppc_inst_t instr) +/* + * A page is mapped and instructions that fit the page are patched. + * Assumes 'len' to be (PAGE_SIZE - offset_in_page(addr)) or below. + */ +static int __do_patch_instructions_mm(u32 *addr, void *code, size_t len, bool fill_insn) { - int err; - u32 *patch_addr; unsigned long text_poke_addr; pte_t *pte; unsigned long pfn = get_patch_pfn(addr); struct mm_struct *patching_mm; struct mm_struct *orig_mm; + ppc_inst_t instr; + void *patch_addr; spinlock_t *ptl; + int ilen, err; patching_mm = __this_cpu_read(cpu_patching_context.mm); text_poke_addr = __this_cpu_read(cpu_patching_context.addr); - patch_addr = (u32 *)(text_poke_addr + offset_in_page(addr)); + patch_addr = (void *)(text_poke_addr + offset_in_page(addr)); pte = get_locked_pte(patching_mm, text_poke_addr, &ptl); if (!pte) @@ -307,11 +312,22 @@ static int __do_patch_instruction_mm(u32 *addr, ppc_inst_t instr) orig_mm = start_using_temp_mm(patching_mm); - err = __patch_instruction(addr, instr, patch_addr); + while (len > 0) { + instr = ppc_inst_read(code); + ilen = ppc_inst_len(instr); + err = __patch_instruction(addr, instr, patch_addr); + /* hwsync performed by __patch_instruction (sync) if successful */ + if (err) { + mb(); /* sync */ + break; + } - /* hwsync performed by __patch_instruction (sync) if successful */ - if (err) - mb(); /* sync */ + len -= ilen; + patch_addr = patch_addr + ilen; + addr = (void *)addr + ilen; + if (!fill_insn) + code = code + ilen; + } /* context synchronisation performed by __patch_instruction (isync or exception) */ stop_using_temp_mm(patching_mm, orig_mm); @@ -328,16 +344,21 @@ static int __do_patch_instruction_mm(u32 *addr, ppc_inst_t instr) return err; } -static int __do_patch_instruction(u32 *addr, ppc_inst_t instr) +/* + * A page is mapped and instructions that fit the page are patched. + * Assumes 'len' to be (PAGE_SIZE - offset_in_page(addr)) or below. + */ +static int __do_patch_instructions(u32 *addr, void *code, size_t len, bool fill_insn) { - int err; - u32 *patch_addr; unsigned long text_poke_addr; pte_t *pte; unsigned long pfn = get_patch_pfn(addr); + void *patch_addr; + ppc_inst_t instr; + int ilen, err; text_poke_addr = (unsigned long)__this_cpu_read(cpu_patching_context.addr) & PAGE_MASK; - patch_addr = (u32 *)(text_poke_addr + offset_in_page(addr)); + patch_addr = (void *)(text_poke_addr + offset_in_page(addr)); pte = __this_cpu_read(cpu_patching_context.pte); __set_pte_at(&init_mm, text_poke_addr, pte, pfn_pte(pfn, PAGE_KERNEL), 0); @@ -345,7 +366,19 @@ static int __do_patch_instruction(u32 *addr, ppc_inst_t instr) if (radix_enabled()) asm volatile("ptesync": : :"memory"); - err = __patch_instruction(addr, instr, patch_addr); + while (len > 0) { + instr = ppc_inst_read(code); + ilen = ppc_inst_len(instr); + err = __patch_instruction(addr, instr, patch_addr); + if (err) + break; + + len -= ilen; + patch_addr = patch_addr + ilen; + addr = (void *)addr + ilen; + if (!fill_insn) + code = code + ilen; + } pte_clear(&init_mm, text_poke_addr, pte); flush_tlb_kernel_range(text_poke_addr, text_poke_addr + PAGE_SIZE); @@ -369,15 +402,46 @@ int patch_instruction(u32 *addr, ppc_inst_t instr) local_irq_save(flags); if (mm_patch_enabled()) - err = __do_patch_instruction_mm(addr, instr); + err = __do_patch_instructions_mm(addr, &instr, ppc_inst_len(instr), false); else - err = __do_patch_instruction(addr, instr); + err = __do_patch_instructions(addr, &instr, ppc_inst_len(instr), false); local_irq_restore(flags); return err; } NOKPROBE_SYMBOL(patch_instruction); +/* + * Patch 'addr' with 'len' bytes of instructions from 'code'. + */ +int patch_instructions(void *addr, void *code, size_t len, bool fill_insn) +{ + unsigned long flags; + size_t plen; + int err; + + while (len > 0) { + plen = min_t(size_t, PAGE_SIZE - offset_in_page(addr), len); + + local_irq_save(flags); + if (mm_patch_enabled()) + err = __do_patch_instructions_mm(addr, code, plen, fill_insn); + else + err = __do_patch_instructions(addr, code, plen, fill_insn); + local_irq_restore(flags); + if (err) + break; + + len -= plen; + addr = addr + plen; + if (!fill_insn) + code = code + plen; + } + + return err; +} +NOKPROBE_SYMBOL(patch_instructions); + int patch_branch(u32 *addr, unsigned long target, int flags) { ppc_inst_t instr; From patchwork Fri Aug 25 15:18:10 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hari Bathini X-Patchwork-Id: 1826199 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=iHZFvnBr; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=2404:9400:2:0:216:3eff:fee1:b9f1; helo=lists.ozlabs.org; envelope-from=linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org; 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Fri, 25 Aug 2023 15:18:24 +0000 (GMT) From: Hari Bathini To: linuxppc-dev , bpf@vger.kernel.org Subject: [PATCH v3 5/5] powerpc/bpf: use patch_instructions() Date: Fri, 25 Aug 2023 20:48:10 +0530 Message-ID: <20230825151810.164418-6-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-ORIG-GUID: zW0Gs0G3hAgvPHrma_6ZckW5s_A8oHh- X-Proofpoint-GUID: zW0Gs0G3hAgvPHrma_6ZckW5s_A8oHh- 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 suspectscore=0 bulkscore=0 mlxscore=0 adultscore=0 spamscore=0 impostorscore=0 mlxlogscore=879 lowpriorityscore=0 phishscore=0 clxscore=1015 priorityscore=1501 malwarescore=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" Use the newly introduced patch_instructions() that handles patching multiple instructions with one call. This improves speed of exectution for JIT'ing bpf programs. Without this patch (on a POWER9 lpar): # time modprobe test_bpf real 2m59.681s user 0m0.000s sys 1m44.160s # With this patch (on a POWER9 lpar): # time modprobe test_bpf real 0m5.013s user 0m0.000s sys 0m4.216s # Signed-off-by: Hari Bathini --- arch/powerpc/net/bpf_jit_comp.c | 30 ++++-------------------------- 1 file changed, 4 insertions(+), 26 deletions(-) diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c index c60d7570e05d..1e5000d18321 100644 --- a/arch/powerpc/net/bpf_jit_comp.c +++ b/arch/powerpc/net/bpf_jit_comp.c @@ -26,28 +26,6 @@ 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, bool fill_insn) -{ - 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; - if (!fill_insn) - 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))) { @@ -330,16 +308,16 @@ int bpf_add_extable_entry(struct bpf_prog *fp, u32 *image, u32 *fimage, int pass void *bpf_arch_text_copy(void *dst, void *src, size_t len) { - void *ret; + int err; 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, false); + err = patch_instructions(dst, src, len, false); mutex_unlock(&text_mutex); - return ret; + return err ? ERR_PTR(err) : dst; } int bpf_arch_text_invalidate(void *dst, size_t len) @@ -351,7 +329,7 @@ int bpf_arch_text_invalidate(void *dst, size_t len) return -EINVAL; mutex_lock(&text_mutex); - ret = IS_ERR(bpf_patch_instructions(dst, &insn, len, true)); + ret = patch_instructions(dst, &insn, len, true); mutex_unlock(&text_mutex); return ret;