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=-2.6 required=3.0 tests=DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,T_DKIM_INVALID, URIBL_BLOCKED,USER_AGENT_GIT 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 D0B4CC5CFEB for ; Wed, 11 Jul 2018 11:32:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7D877208FA for ; Wed, 11 Jul 2018 11:32:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=8bytes.org header.i=@8bytes.org header.b="D10ARwIb" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7D877208FA Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=8bytes.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733310AbeGKLgq (ORCPT ); Wed, 11 Jul 2018 07:36:46 -0400 Received: from 8bytes.org ([81.169.241.247]:37666 "EHLO theia.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732849AbeGKLeE (ORCPT ); Wed, 11 Jul 2018 07:34:04 -0400 Received: by theia.8bytes.org (Postfix, from userid 1000) id 5432B8C0; Wed, 11 Jul 2018 13:30:02 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=8bytes.org; s=mail-1; t=1531308603; bh=qYlJ2zsyHaAhXUQt0Hazi8E1heNgKD3G46Knr4YajHM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=D10ARwIbKulSGO3F3WCH/Mm5raDVe+fmAZlPNY7owe3froqAYyA9nA7fOAx9Pr0jb tPmwJF+FIhnqr5N/z36o1okE/OFdV13r9lIDXJ4PStPx7K3ReVg1aiLT2KIFlZkqm4 cWSztOk3vBUiIJ5TeSjIgRuP92ZW+zcODhLNQIlwRumoW9jwPdhHrtLNIsRq3H7ELZ keyDwWD6Rv8QOANBY6gURq98qUVNsWAK5jlhSR0/Xfbl2z5m0uBnoKVxw4Y+UQ4j9C 9f+eA+jr/+rE7W+4vDwvpFJyPxaYlQNsZITINKf0VTWdCqxoKzXLhmQtuOFoRgi3hG VohqNqz0kafDA== From: Joerg Roedel To: Thomas Gleixner , Ingo Molnar , "H . Peter Anvin" Cc: x86@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Linus Torvalds , Andy Lutomirski , Dave Hansen , Josh Poimboeuf , Juergen Gross , Peter Zijlstra , Borislav Petkov , Jiri Kosina , Boris Ostrovsky , Brian Gerst , David Laight , Denys Vlasenko , Eduardo Valentin , Greg KH , Will Deacon , aliguori@amazon.com, daniel.gruss@iaik.tugraz.at, hughd@google.com, keescook@google.com, Andrea Arcangeli , Waiman Long , Pavel Machek , "David H . Gutteridge" , jroedel@suse.de, joro@8bytes.org Subject: [PATCH 16/39] x86/pgtable/pae: Unshare kernel PMDs when PTI is enabled Date: Wed, 11 Jul 2018 13:29:23 +0200 Message-Id: <1531308586-29340-17-git-send-email-joro@8bytes.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1531308586-29340-1-git-send-email-joro@8bytes.org> References: <1531308586-29340-1-git-send-email-joro@8bytes.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Joerg Roedel With PTI we need to map the per-process LDT into the kernel address-space for each process, so we need separate kernel PMDs per PGD. Signed-off-by: Joerg Roedel --- arch/x86/include/asm/pgtable-3level_types.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/pgtable-3level_types.h b/arch/x86/include/asm/pgtable-3level_types.h index 6a59a6d..78038e0 100644 --- a/arch/x86/include/asm/pgtable-3level_types.h +++ b/arch/x86/include/asm/pgtable-3level_types.h @@ -21,9 +21,10 @@ typedef union { #endif /* !__ASSEMBLY__ */ #ifdef CONFIG_PARAVIRT -#define SHARED_KERNEL_PMD (pv_info.shared_kernel_pmd) +#define SHARED_KERNEL_PMD ((!static_cpu_has(X86_FEATURE_PTI) && \ + (pv_info.shared_kernel_pmd))) #else -#define SHARED_KERNEL_PMD 1 +#define SHARED_KERNEL_PMD (!static_cpu_has(X86_FEATURE_PTI)) #endif /* -- 2.7.4