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 5D7BAC49361 for ; Fri, 18 Jun 2021 15:21:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 401A36127C for ; Fri, 18 Jun 2021 15:21:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235166AbhFRPYB (ORCPT ); Fri, 18 Jun 2021 11:24:01 -0400 Received: from Galois.linutronix.de ([193.142.43.55]:56842 "EHLO galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235002AbhFRPWW (ORCPT ); Fri, 18 Jun 2021 11:22:22 -0400 Message-Id: <20210618143449.407190772@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1624029612; 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=8bNqn55/9FpzYwdYhLYJ1YHhSO8g4U3kMgFFLHLaBYo=; b=S4/oJ0N3WI3dsw9XkJQu5eN9VpAb3BDrSgbpXzBmGEeAh5xYvTdUUxdoJ8SKF5OWx76sA6 0cQxf8EdbtXpNB2C7zNCQF2QjW0rrxZ+tT2kr3VXghVu/AhPDCzyFSpRAEgN00nJuCeBiz nKIt26oIw2GiT96COJx+aSoxCCS8MsyqozrufNQxJJZNUqnZcq0NbRIaJivQx5L3A19I2b 7gmK+e+Xu5/AorlrQOM9RYmxe1MAm0XIlkfWBQM4pBACgvcuPbxdfTst9ZAD2je4xQtMnz zGGTd8Cu11adiU08JFBys/IfDVT1TwKd/GgNusv3Uh5jzDFaf4Ry+Tik7SbLmQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1624029612; 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=8bNqn55/9FpzYwdYhLYJ1YHhSO8g4U3kMgFFLHLaBYo=; b=MwRkoqV6ghsetRg8uqnYat8tqDGMUTqijg55aKoijUfDjIWLfXjM41rvjY3YXQeYhzR+ay NCxVNteVxPH5SmBA== Date: Fri, 18 Jun 2021 16:19:07 +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 V3 44/66] x86/cpu: Write the default PKRU value when enabling PKE References: <20210618141823.161158090@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 In preparation of making the PKRU management more independent from XSTATES, write the default PKRU value into the hardware right after enabling PKRU in CR4. This ensures that switch_to() and copy_thread() have the correct setting for init task and the per CPU idle threads right away. Signed-off-by: Thomas Gleixner --- arch/x86/kernel/cpu/common.c | 2 ++ 1 file changed, 2 insertions(+) --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -480,6 +480,8 @@ static __always_inline void setup_pku(st } cr4_set_bits(X86_CR4_PKE); + /* Load the default PKRU value */ + pkru_write_default(); } #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS