From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AG47ELv/BAnqzqQrBlu9OsR3WHjhDTCjt5HO7kQErXiJtZU/7avG8+jt3D2vYPv+wmZLzOxTlXuz ARC-Seal: i=1; a=rsa-sha256; t=1520245575; cv=none; d=google.com; s=arc-20160816; b=kgH0G01lax1wowbTUr9F9KFWdYcqAq+1etklaZcwxNnXoV58V8ewU5h4612l4Jc7nT zXZU477nO1wQD/I3MXRx6cRD9r+3Ql+DaCi2bBAjNx3IYvFcR1wwZ7RdFdxaPtrvZa1a Qwbf5dge/rbvUJ/V1ZVfZd5sDF1Od7tUayDUJqa9o/3WjnlLbfGFSRtgIfhJim4LDBgY uPIiQrZv03QdIP4mqLazASllInyD808KuwktOFpMvAZE9K9t5HkueUcZnk3P+N4b5BUT UGiVTtOb/D7sNDrawR7GwkJO75o5zjnYtETCaDQ54J25eQ6pMPdU9K2aRe3p+JX1L2M3 vdkQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature:arc-authentication-results; bh=59MhfMU72c18caWRDgmz/TzHGVoGLjlnnaF4XkAcR74=; b=QI+MyY/uA8GFLNQ3tU0J/IrZXK4woO71FL6T+wEYgRUnLpTw0EEJRgYaf23vohQUJ+ BV+PLoLGVTUI3jkaWS4vmLHJwkvihT73NgR2k7qnn7wM0Ph9SgiM3gcG3T8Mv+hD1yiu 1dEetaGf6km9Fhnx6UfPkL2NMvbUMio/7Hg8yDS9WQwHyefGN0nwpWzYG5qXDowvKz0f FbjkBAcjnUzXuGFKSkZFPBMg3Zyydfju6Tnv+P2YihAfxQdKjWqeS6Y+xuA/HZ43IuHZ rzJKm3OPb5YOHnq7yRHV2/nQnV+44+tveehmZhcdAvD368FfRGiw8xxkJf2ntTX+PD7T uBtw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass (test mode) header.i=@8bytes.org header.s=mail-1 header.b=Cx1hIp5A; spf=pass (google.com: domain of joro@8bytes.org designates 81.169.241.247 as permitted sender) smtp.mailfrom=joro@8bytes.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=8bytes.org Authentication-Results: mx.google.com; dkim=pass (test mode) header.i=@8bytes.org header.s=mail-1 header.b=Cx1hIp5A; spf=pass (google.com: domain of joro@8bytes.org designates 81.169.241.247 as permitted sender) smtp.mailfrom=joro@8bytes.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=8bytes.org 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 , jroedel@suse.de, joro@8bytes.org Subject: [PATCH 16/34] x86/pgtable/pae: Unshare kernel PMDs when PTI is enabled Date: Mon, 5 Mar 2018 11:25:45 +0100 Message-Id: <1520245563-8444-17-git-send-email-joro@8bytes.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1520245563-8444-1-git-send-email-joro@8bytes.org> References: <1520245563-8444-1-git-send-email-joro@8bytes.org> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1594093023818886947?= X-GMAIL-MSGID: =?utf-8?q?1594093023818886947?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 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 876b4c7..ed8a200 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