From nobody Wed Dec 24 14:16:38 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AA4B01350C5; Thu, 25 Jan 2024 18:21:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706206890; cv=none; b=iraHqo3K8IKYGW0Wc8jLizI157tS+Tdk4NLfigaOvDUHHG1RMPoG3Wd4LUIOe5ttYUmaqVIGl9/bEN+CK9mZD2L/00IimjP/JteBy5Vtyvo+csUXc8RBL8vt4//WV0Kvpf0w2ajHDbs/HWFguAtstVOqd5RLQ+Wgyjda6gRPxcw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706206890; c=relaxed/simple; bh=+woFgBFR7FjVUxENH8S2w2upZzVCogldGYepU0WKYmg=; h=Date:From:To:Subject:Cc:In-Reply-To:References:MIME-Version: Message-ID:Content-Type; b=iD6fvhPqLJ/rVihqK5xU5Un4KKphWJGaEso0X3CB3XE45N3vVFuSoRdtG0hpFXNffeG8TZwLpghBt79dvwVv/EMrRodNkGwhjymb2X7yuHfI8YLtc9yedUkLlNHG+ZRv7mxWD5LTn7g2nbq7NwUCKR6HPugN2S3481e+rDAaJDg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=Q/gAX/Qq; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=puj3jBB8; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="Q/gAX/Qq"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="puj3jBB8" Date: Thu, 25 Jan 2024 18:21:19 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1706206881; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5o12gXaKcz7ZubiINHsnlNZBKZnMDOcz7iC++kWJEqw=; b=Q/gAX/QqUpKexWFiETm5Aq3BKCpcgXa7IfgSzWerasNahQ57zcCcTBZnSNdyBfbuAgXzyN IV5ado5j9DCQ/FkH+bkwYX65VJIBkIfHOBHxjs61hnM/jTsOI8ed3dLpXLzutYoW4BXevK 8oH6uyiTv5Eqr10FANl157DaAycEaIMmJA+V1S/ZmLXEg1c/5z4dBUjNwsiPae4QyZGfMK CwhmkyYW9nLotKZunqLsEE3JDAbPwbHv0V3yPmafCXpmwxIp22FKGYXcyCwcmzrE9CyGEH iPoGz7jhZOkURfK/fBNxDXIuANeAMYPkO1/pjnPGHYnOxNpJc5V6TZ8ix5ACUA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1706206881; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5o12gXaKcz7ZubiINHsnlNZBKZnMDOcz7iC++kWJEqw=; b=puj3jBB8JR8wFzKRpy24Z5b9Z67UsiLyaDaa1zJLH5DWT0bIt/f5JN4pIQ08lJs+qxgxTd AHcKuNGe+b0WuVBw== From: "tip-bot2 for H. Peter Anvin (Intel)" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: x86/fred] x86/fred: Let ret_from_fork_asm() jmp to asm_fred_exit_user when FRED is enabled Cc: "H. Peter Anvin (Intel)" , Xin Li , Thomas Gleixner , Shan Kang , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20231205105030.8698-29-xin3.li@intel.com> References: <20231205105030.8698-29-xin3.li@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <170620687978.398.12424515755549914146.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Precedence: bulk Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable The following commit has been merged into the x86/fred branch of tip: Commit-ID: 81e71a71266e2fbe42632f725147ed5b8f75b11e Gitweb: https://git.kernel.org/tip/81e71a71266e2fbe42632f725147ed5b8= f75b11e Author: H. Peter Anvin (Intel) AuthorDate: Tue, 05 Dec 2023 02:50:17 -08:00 Committer: Thomas Gleixner CommitterDate: Thu, 25 Jan 2024 19:10:33 +01:00 x86/fred: Let ret_from_fork_asm() jmp to asm_fred_exit_user when FRED is en= abled Let ret_from_fork_asm() jmp to asm_fred_exit_user when FRED is enabled, otherwise the existing IDT code is chosen. Signed-off-by: H. Peter Anvin (Intel) Signed-off-by: Xin Li Signed-off-by: Thomas Gleixner Tested-by: Shan Kang Link: https://lore.kernel.org/r/20231205105030.8698-29-xin3.li@intel.com --- arch/x86/entry/entry_64.S | 6 ++++++ arch/x86/entry/entry_64_fred.S | 1 + 2 files changed, 7 insertions(+) diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 29ce68f..7c4b726 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -247,7 +247,13 @@ SYM_CODE_START(ret_from_fork_asm) * and unwind should work normally. */ UNWIND_HINT_REGS + +#ifdef CONFIG_X86_FRED + ALTERNATIVE "jmp swapgs_restore_regs_and_return_to_usermode", \ + "jmp asm_fred_exit_user", X86_FEATURE_FRED +#else jmp swapgs_restore_regs_and_return_to_usermode +#endif SYM_CODE_END(ret_from_fork_asm) .popsection =20 diff --git a/arch/x86/entry/entry_64_fred.S b/arch/x86/entry/entry_64_fred.S index 37a1dd5..5781c34 100644 --- a/arch/x86/entry/entry_64_fred.S +++ b/arch/x86/entry/entry_64_fred.S @@ -32,6 +32,7 @@ SYM_CODE_START_NOALIGN(asm_fred_entrypoint_user) FRED_ENTER call fred_entry_from_user +SYM_INNER_LABEL(asm_fred_exit_user, SYM_L_GLOBAL) FRED_EXIT ERETU SYM_CODE_END(asm_fred_entrypoint_user)