From patchwork Mon Apr 6 18:16:40 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christophe Leroy X-Patchwork-Id: 1267021 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 48wzX23JDgz9sR4 for ; Tue, 7 Apr 2020 04:26:42 +1000 (AEST) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=c-s.fr Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=c-s.fr header.i=@c-s.fr header.a=rsa-sha256 header.s=mail header.b=aIXMTl0c; dkim-atps=neutral Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 48wzX21XVczDqlV for ; Tue, 7 Apr 2020 04:26:42 +1000 (AEST) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=c-s.fr (client-ip=93.17.236.30; helo=pegase1.c-s.fr; envelope-from=christophe.leroy@c-s.fr; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=c-s.fr Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=c-s.fr header.i=@c-s.fr header.a=rsa-sha256 header.s=mail header.b=aIXMTl0c; dkim-atps=neutral Received: from pegase1.c-s.fr (pegase1.c-s.fr [93.17.236.30]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 48wzJX22FNzDqW1 for ; Tue, 7 Apr 2020 04:16:44 +1000 (AEST) Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 48wzJS5VDmz9tyd4; Mon, 6 Apr 2020 20:16:40 +0200 (CEST) Authentication-Results: localhost; dkim=pass reason="1024-bit key; insecure key" header.d=c-s.fr header.i=@c-s.fr header.b=aIXMTl0c; dkim-adsp=pass; dkim-atps=neutral X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id TGiJ8bsEBvz7; Mon, 6 Apr 2020 20:16:40 +0200 (CEST) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 48wzJS4R7Jz9tycr; Mon, 6 Apr 2020 20:16:40 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=c-s.fr; s=mail; t=1586197000; bh=/9XgCX7ZNJJPrUF+WQ+S9CCuMlj+u/mt4LD/Anh8LO4=; h=In-Reply-To:References:From:Subject:To:Cc:Date:From; b=aIXMTl0ci/qJ/Zg5T2BGlqvBO1C1o9yWOJW4tbot1k/1Vxo24G2LGIOlcCU1B366H jdhFCo7arjVZtaC8L4xtkAVwtcv46BaH55AHk+6olCmzyhT2HZ3vH+4AHL0l6L7U24 TFoQh+jeUwZvMvk38AEVDc7Vw0SbtWwFXvtTwdIQ= Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 8ECBB8B784; Mon, 6 Apr 2020 20:16:40 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id Tb15_YGivxb0; Mon, 6 Apr 2020 20:16:40 +0200 (CEST) Received: from pc16570vm.idsi0.si.c-s.fr (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 59D4F8B775; Mon, 6 Apr 2020 20:16:40 +0200 (CEST) Received: by pc16570vm.idsi0.si.c-s.fr (Postfix, from userid 0) id 30558656E9; Mon, 6 Apr 2020 18:16:40 +0000 (UTC) Message-Id: In-Reply-To: <5aeaa33383e833f6eca30893fbd188b88e019eaa.1586196948.git.christophe.leroy@c-s.fr> References: <5aeaa33383e833f6eca30893fbd188b88e019eaa.1586196948.git.christophe.leroy@c-s.fr> From: Christophe Leroy Subject: [RFC PATCH v3 04/15] powerpc/8xx: Create C version of kuap_restore() and kuap_check() To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , npiggin@gmail.com, msuchanek@suse.de Date: Mon, 6 Apr 2020 18:16:40 +0000 (UTC) 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: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" In preparation of porting PPC32 to C syscall entry/exit, create C version of kuap_restore() and kuap_check() on 8xx Signed-off-by: Christophe Leroy --- arch/powerpc/include/asm/nohash/32/kup-8xx.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/powerpc/include/asm/nohash/32/kup-8xx.h b/arch/powerpc/include/asm/nohash/32/kup-8xx.h index 85ed2390fb99..1918d2e55da3 100644 --- a/arch/powerpc/include/asm/nohash/32/kup-8xx.h +++ b/arch/powerpc/include/asm/nohash/32/kup-8xx.h @@ -34,6 +34,19 @@ #include +static inline void kuap_restore(struct pt_regs *regs) +{ + mtspr(SPRN_MD_AP, regs->kuap); +} + +static inline void kuap_check(void) +{ + if (!IS_ENABLED(CONFIG_PPC_KUAP_DEBUG)) + return; + + WARN_ON_ONCE((mfspr(SPRN_MD_AP) & 0xffff0000) != (MD_APG_KUAP & 0xffff0000)); +} + static inline void allow_user_access(void __user *to, const void __user *from, unsigned long size, unsigned long dir) {