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Thu, 9 Mar 2023 18:00:33 +0000 (GMT) From: Hari Bathini To: linuxppc-dev , bpf@vger.kernel.org Subject: [PATCH v2 2/4] powerpc/bpf: implement bpf_arch_text_copy Date: Thu, 9 Mar 2023 23:30:26 +0530 Message-Id: <20230309180028.180200-3-hbathini@linux.ibm.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230309180028.180200-1-hbathini@linux.ibm.com> References: <20230309180028.180200-1-hbathini@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: mLD8JkM1oHAXnUTcUjwGXZhbE8UYXuZq X-Proofpoint-ORIG-GUID: mLD8JkM1oHAXnUTcUjwGXZhbE8UYXuZq X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-03-09_09,2023-03-09_01,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 impostorscore=0 clxscore=1015 phishscore=0 suspectscore=0 mlxlogscore=999 adultscore=0 spamscore=0 lowpriorityscore=0 malwarescore=0 bulkscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2303090141 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 the newly introduced patch_instructions() to implement it. Around 5X improvement in speed of execution observed, using the new patch_instructions() function over patch_instruction(), while running the tests from test_bpf.ko. Signed-off-by: Hari Bathini --- arch/powerpc/net/bpf_jit_comp.c | 23 ++++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c index e93aefcfb83f..0a70319116d1 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) @@ -272,3 +275,21 @@ 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 = ERR_PTR(-EINVAL); + int err; + + if (WARN_ON_ONCE(core_kernel_text((unsigned long)dst))) + return ret; + + ret = dst; + mutex_lock(&text_mutex); + err = patch_instructions(dst, src, false, len); + if (err) + ret = ERR_PTR(err); + mutex_unlock(&text_mutex); + + return ret; +}