From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f169.google.com (mail-pl1-f169.google.com [209.85.214.169]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 38AF13F54BC for ; Fri, 27 Mar 2026 14:16:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.169 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774620984; cv=none; b=VLU5u7mZNpI8CG5eg+IY8iQ4Yd6O9YclnOvYr993Q71bi7c1MYy/ei3oojKxhLbAESRBzmD0bMRRAz5GmflnFfxkcxt9xsQfDixBaD2XWAlyEVlvMeBhqeTzFpvs7//MDYHzXKWOiU5wXDISFZIenjYvTplFPHvZZYitITEuh64= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774620984; c=relaxed/simple; bh=e2+JS5Yp1/AVGJk+LSABDSeuGsPf3k3Eor161jNWxWk=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=gU1atPYv5Z6Qm0R6d4ZBR9DPTIdh+4UggvzVgKg2Q7C9ePnJVb/pb0kNQ5Zgu11Y72u/8EJH0Uq/rpnQvgKCC0hSLQNH+Rd3GrmscxvyaRQ0rTrSCxfwTrpuXSFZwNeDuOkgnc8r4DYoyDEMPZVh53BRQ3cd/bevczPydBRLBPU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=Z4v9uhrc; arc=none smtp.client-ip=209.85.214.169 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Z4v9uhrc" Received: by mail-pl1-f169.google.com with SMTP id d9443c01a7336-2b0ba3bfe16so18608535ad.1 for ; Fri, 27 Mar 2026 07:16:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1774620980; x=1775225780; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=HdOqqV7IplzNrdbF0+0H27VtKzl7S3MD/ZAuINMKre4=; b=Z4v9uhrcztq13ZpqT+KQELZ+zq3lfD1cuyPG4GrsXvoMx3uC5xftgzUUWi58AxZj0e EhGxKpZArQBOuZ0mGDTcSHswWU/7SZYRSWRld4oRRgR0LbEAtRuobAFUy4rLehW4N4c2 obmSg9qBBUgkWUS9r7CVBBTbWoi6yoi30TNJp4fcw58loqCchy3C7phf5X8QrCNaOIiS a0lx1OMEIGX6jg2xlpjbLaFL/6quWZc1tw7RilGCxY8vWghxPpv4VM3UYTm4dQKd/v0z /Tu1rU6ffCflMK+lAbXZObNUmGvNmmdBqG15mNOflZFW83x7KFMayuw/us543busrX9U EFWw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1774620980; x=1775225780; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=HdOqqV7IplzNrdbF0+0H27VtKzl7S3MD/ZAuINMKre4=; b=E13beMMh8PVRvNJUQ5U+U/EWaQr75EHWEeYQkyTPQxy28wmQ9yEj3c2iiZ8OePmn4O lvUUDYzCjFiWHEX73pFxAn0TpHQT529YTxM0B5KRC1z7v0Ulhw1IRsg4lyK+dKj36l0i CSxBMCYbx/vjXe7IKrrVXOWCAnP5cvfcP2ORT11aDnU3HxVVCa2qxe80zhQmm4OfGc8H GUfo1PxZ/XDeIv5UanDBtKQVekChFK9/F1ZmE9tTEzSPTAhC0/nAd9wvH8Kh63mr8y11 SNTtx0mXpV6AWbjvzbLzviwp1MRx1QDDB2fKWAPGE91D743b0QCGhNIZCyg2I6x+slDW 5zDA== X-Forwarded-Encrypted: i=1; AJvYcCVPLPz+/TTp3Q2iuBYrJqNw/rG9F9bk9wwEPQlXVV9y+Oah+rw0Bh++gJIYRl9X/MhcBFobaFdnXgsrDYA=@vger.kernel.org X-Gm-Message-State: AOJu0YxbylTro/PitSh5e3Ub9obf3TO6HiCjgMitCHQTy5LBFsNdj3lG tbVuUfeNTvNpmdxqDnchLHOq0vyEtXTjGd3AY7UObBT2JDn+eOLSk7z4 X-Gm-Gg: ATEYQzyKSuzlDFZIEJA7RhPcjFLBjQbjuXutOxUHNkSEUwAgU3AKFkmjechLAG+zseJ R7RbD1H22cQjfh6VIIkGd7YQStMoOy735avm1SysncPOeBZNgJD9AtFv+XmH1nPH4S9LcpDN6sq 2EZ7P1ZwgF8LX41k7wCWwIzUzw6wXP+PyruxsepGfuhA87wAnPbXpYueeU6NoxJV18OothBlKB1 9iUxKTFVhNWh2B4BX5CUKEBLVTOAv0nkRBGHKA7kAtaZgeec1doaORXFMdNPCGpXWeDGfLG+g3n 7+Xf+ofssSBvCtFBdblBjoxmfMt9II4OW9tHM1ZlDyArIegTIyPFWTALtxs8rDLrqn53rd/P5AO FSMz6avM8K2QbTZQzyHY5OfPKjtM422feaRVDOIzhrgNfY3Xk9//4pdr1uJrtVqIyD6B59Ds9Gg Am2ZMseoW7uMU0VRQ6/SDJstEjaruTGqBexqeVoBDvJvRRcD75fDdIv7KTDSK6hzwbE0ojwZtKs zPAWnf1eoIdIOfSt3vvvsFdeXyN7GQIhA== X-Received: by 2002:a17:903:2288:b0:2b0:bcda:76c3 with SMTP id d9443c01a7336-2b0c4929f65mr53849025ad.23.1774620979961; Fri, 27 Mar 2026 07:16:19 -0700 (PDT) Received: from lab-kiba-ocxma-dut-01.. (191.68.231.218.rev.ocx2915.net. [218.231.68.191]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2b0bc8e958csm61371365ad.66.2026.03.27.07.16.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 Mar 2026 07:16:19 -0700 (PDT) From: Takeru Hayasaka To: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org Cc: bpf@vger.kernel.org, x86@kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH bpf-next 0/2] bpf: enable x86 fentry on tail-called programs Date: Fri, 27 Mar 2026 14:16:00 +0000 Message-ID: <20260327141616.1961457-1-hayatake396@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This series enables fentry on x86 BPF programs reached via tail calls and adds a focused selftest for the expected behavior. Patch 1 fixes the x86 mirrored text-poke lookup so the tail-call landing slot is patched on both IBT and non-IBT JITs. Patch 2 adds a selftest that checks both direct entry and tail-called entry for a tailcall callee with fentry attached. Takeru Hayasaka (2): bpf, x86: patch tail-call fentry slot on non-IBT JITs selftests/bpf: cover fentry on tailcalled programs arch/x86/net/bpf_jit_comp.c | 47 +++++++- .../selftests/bpf/prog_tests/tailcalls.c | 110 ++++++++++++++++++ .../bpf/progs/tailcall_fentry_probe.c | 16 +++ .../bpf/progs/tailcall_fentry_target.c | 27 +++++ 4 files changed, 197 insertions(+), 3 deletions(-) create mode 100644 tools/testing/selftests/bpf/progs/tailcall_fentry_probe.c create mode 100644 tools/testing/selftests/bpf/progs/tailcall_fentry_target.c -- 2.43.0