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Thu, 28 Sep 2023 19:48:24 +0000 (GMT) From: Hari Bathini To: linuxppc-dev , bpf@vger.kernel.org Subject: [PATCH v5 2/5] powerpc/bpf: implement bpf_arch_text_copy Date: Fri, 29 Sep 2023 01:18:15 +0530 Message-ID: <20230928194818.261163-3-hbathini@linux.ibm.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230928194818.261163-1-hbathini@linux.ibm.com> References: <20230928194818.261163-1-hbathini@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: pJK6Z4BA5ek5jjHqKDcokptuAEnUOJFZ X-Proofpoint-ORIG-GUID: pJK6Z4BA5ek5jjHqKDcokptuAEnUOJFZ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.980,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-09-28_19,2023-09-28_03,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 clxscore=1015 impostorscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 lowpriorityscore=0 spamscore=0 bulkscore=0 phishscore=0 malwarescore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2309180000 definitions=main-2309280167 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. Signed-off-by: Hari Bathini Acked-by: Song Liu --- arch/powerpc/net/bpf_jit_comp.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c index 37043dfc1add..c740eac8d584 100644 --- a/arch/powerpc/net/bpf_jit_comp.c +++ b/arch/powerpc/net/bpf_jit_comp.c @@ -13,9 +13,13 @@ #include #include #include -#include +#include +#include #include +#include +#include + #include "bpf_jit.h" static void bpf_jit_fill_ill_insns(void *area, unsigned int size) @@ -274,3 +278,17 @@ 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) +{ + int err; + + if (WARN_ON_ONCE(core_kernel_text((unsigned long)dst))) + return ERR_PTR(-EINVAL); + + mutex_lock(&text_mutex); + err = patch_instructions(dst, src, len, false); + mutex_unlock(&text_mutex); + + return err ? ERR_PTR(err) : dst; +}