From patchwork Thu Jan 27 07:15:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hou Tao X-Patchwork-Id: 12728136 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E6977C433F5 for ; Fri, 28 Jan 2022 08:43:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=zLogLsavxeTeCB2vpMeEUTQFJikNt8S3pn2nxwrbTJc=; b=ZrcyJqbvqMoVH3 YERQTewneesXpH9cxhvZa80Dxq5aBfDXEJJNgO/fQjgfpJ0Jslgn19bevgmlndQgR9zAcXF1fc0qQ FW6UviRWXVkhVoqlinTOqIXyO2Bv8GZNqdAknwQHLhxZ6sBnNn4SyPOADiFxsaWXBo2JoNuPLlHI7 gkUSZRZje+nOJuqJWIyO+B4s5PH93jsbKfI7wrBkuN7KI/CRo4n4xwneHqfe50t4N069YvTGyEr3U hmJHZRlM9CkJC+nwFooyYlgE+EDwUGI/1MYsBGIiGSYfzjp2Jp3sFY1jyI02AIOVXmk1LpxT7yDRZ UhlO217kEKPUYyerPFWQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nDMps-0012ZI-FR; Fri, 28 Jan 2022 08:42:24 +0000 Received: from szxga02-in.huawei.com ([45.249.212.188]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nDMpU-0012UJ-UV for linux-arm-kernel@lists.infradead.org; Fri, 28 Jan 2022 08:42:03 +0000 Received: from dggpeml500025.china.huawei.com (unknown [172.30.72.57]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4JlWB820s3z9sbl; Fri, 28 Jan 2022 16:40:32 +0800 (CST) Received: from huawei.com (10.175.124.27) by dggpeml500025.china.huawei.com (7.185.36.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.21; Fri, 28 Jan 2022 16:41:48 +0800 From: Hou Tao To: Daniel Borkmann CC: Alexei Starovoitov , Martin KaFai Lau , Yonghong Song , Andrii Nakryiko , "David S . Miller" , Jakub Kicinski , John Fastabend , , , , Zi Shen Lim , Catalin Marinas , Will Deacon , Ard Biesheuvel , Subject: [PATCH bpf-next v2 1/2] bpf, arm64: enable kfunc call Date: Thu, 27 Jan 2022 15:15:31 +0800 Message-ID: <20220127071532.384888-2-houtao1@huawei.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220127071532.384888-1-houtao1@huawei.com> References: <20220127071532.384888-1-houtao1@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.124.27] X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To dggpeml500025.china.huawei.com (7.185.36.35) X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220128_004201_178465_052EECDB X-CRM114-Status: UNSURE ( 7.44 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Since commit b2eed9b58811 ("arm64/kernel: kaslr: reduce module randomization range to 2 GB"), for arm64 whether KASLR is enabled or not, the module is placed within 2GB of the kernel region, so s32 in bpf_kfunc_desc is sufficient to represente the offset of module function relative to __bpf_call_base. The only thing needed is to override bpf_jit_supports_kfunc_call(). Signed-off-by: Hou Tao --- arch/arm64/net/bpf_jit_comp.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c index 6d92f363028c..e60c464004c2 100644 --- a/arch/arm64/net/bpf_jit_comp.c +++ b/arch/arm64/net/bpf_jit_comp.c @@ -1284,6 +1284,11 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog) return prog; } +bool bpf_jit_supports_kfunc_call(void) +{ + return true; +} + u64 bpf_jit_alloc_exec_limit(void) { return VMALLOC_END - VMALLOC_START;