From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BBA85C48BE6 for ; Mon, 14 Jun 2021 16:39:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A547361078 for ; Mon, 14 Jun 2021 16:39:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235220AbhFNQl6 (ORCPT ); Mon, 14 Jun 2021 12:41:58 -0400 Received: from Galois.linutronix.de ([193.142.43.55]:56216 "EHLO galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234934AbhFNQke (ORCPT ); Mon, 14 Jun 2021 12:40:34 -0400 Message-Id: <20210614155357.455857263@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1623688710; h=from:from: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: references:references; bh=k6/81Nf+e6pRycJkI5KcFdhXFlJ0ri3uWt/suup+NPo=; b=JtDXoOxeupOXJOMa9U97XUAwtV6zI7giNJfz0y3yl6u6TN1eJrqDC6GFAONedGeWTUf5Qk 5WHrZXGJbQcKu5b3g1KUxaQk3kTegSBQqx+6ckua4rUmXC/XiOdC7GBlTeGh2sQCfs2M61 Fsg/62SfjjWBE6SgLKt3u6QAjtWa0y5wkaM4DTmGPZ/U9DSoHmfA5uQuYGhzRf+rEWyfkz OdtTziWuKtlGd+LNhR5UTTx5PZxu1GpGX/VwiEKY6NBsHKZ0C/kn8/w+Qn7TLs5y+5j8yM 3RU0KC1aN+J5Gs68QN92KBHJxFlwltPHxLj3uu07WCc2yrdrnZomG84EShB2Sw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1623688710; h=from:from: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: references:references; bh=k6/81Nf+e6pRycJkI5KcFdhXFlJ0ri3uWt/suup+NPo=; b=06dGySKHYl2RzUpWRIKBSPt7rfb2tvm9Kt85VjMcN7cRwl2UE0Jbm5DSLYqIT8pLGO/pb5 jCWT26pMmfkisIAQ== Date: Mon, 14 Jun 2021 17:44:45 +0200 From: Thomas Gleixner To: LKML Cc: Andy Lutomirski , Dave Hansen , Fenghua Yu , Tony Luck , Yu-cheng Yu , Sebastian Andrzej Siewior , Borislav Petkov , Peter Zijlstra , Kan Liang Subject: [patch V2 37/52] x86/pkru: Provide pkru_write_default() References: <20210614154408.673478623@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-transfer-encoding: 8-bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Provide a simple and trivial helper which just writes the PKRU default value without trying to fiddle with the tasks xsave buffer. Signed-off-by: Thomas Gleixner --- arch/x86/include/asm/pkru.h | 8 ++++++++ 1 file changed, 8 insertions(+) --- a/arch/x86/include/asm/pkru.h +++ b/arch/x86/include/asm/pkru.h @@ -60,4 +60,12 @@ static inline void write_pkru(u32 pkru) fpregs_unlock(); } +static inline void pkru_write_default(void) +{ + if (!cpu_feature_enabled(X86_FEATURE_OSPKE)) + return; + + wrpkru(pkru_get_init_value()); +} + #endif