Message ID | 20190508144422.13171-17-kirill.shutemov@linux.intel.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show
Return-Path: <owner-linux-mm@kvack.org> Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0F74F1515 for <patchwork-linux-mm@patchwork.kernel.org>; Wed, 8 May 2019 14:45:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F3291283B0 for <patchwork-linux-mm@patchwork.kernel.org>; Wed, 8 May 2019 14:45:24 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E73FB2844B; Wed, 8 May 2019 14:45:24 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7089E283B0 for <patchwork-linux-mm@patchwork.kernel.org>; Wed, 8 May 2019 14:45:24 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 67E9F6B0275; Wed, 8 May 2019 10:44:45 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 51C0C6B0272; Wed, 8 May 2019 10:44:45 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 398A86B0274; Wed, 8 May 2019 10:44:45 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from mail-pg1-f200.google.com (mail-pg1-f200.google.com [209.85.215.200]) by kanga.kvack.org (Postfix) with ESMTP id EA9466B0271 for <linux-mm@kvack.org>; Wed, 8 May 2019 10:44:44 -0400 (EDT) Received: by mail-pg1-f200.google.com with SMTP id d22so119108pgg.2 for <linux-mm@kvack.org>; Wed, 08 May 2019 07:44:44 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-original-authentication-results:x-gm-message-state:from:to:cc :subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=yWHOhsSwc3WWUoJslsLAWQcHXdi9Dc2j78/2TZTMTFI=; b=K/vaTZg2FbSBqSIsGDl4P4+xbnGVBDbFyJSm7PYbLntuqKZ/oEkq0GEKZ4mBKlqq/P mawQFAk/O9yaE6VZeuMPQf284S5WbPcVhOfRnXbg9cHeuZkxh0rOKXS2QVQtIBFGfcw9 QT8RLdHwyuft/OMVR6zSwAOfo/RjJYeMM7NP0Y6H3VyJJ6hlFl+mIdu3qhx38SyxcWBf XJ2nRLt9r0P9I9GznygWonc1C1inLGsfTz/wOqoWyrZJ8qgu5hrSZclK7bB1qWR0yDV5 8xxW1iLP6Zxq6TxiinCcubTaDX18q95hZalt6jD/BcNR++c7nEmRLPEhjg4je6Zcs8De zqpQ== X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of kirill.shutemov@linux.intel.com designates 192.55.52.136 as permitted sender) smtp.mailfrom=kirill.shutemov@linux.intel.com; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com X-Gm-Message-State: APjAAAXnfyXxWs5i6IbCs829FORsDLdn8PGWAQ6t6o8jpT7XbbbuhI0g 6WnbSYDqtdtH3epkdHxG0sKaWcGNdHSFoYPO/VUbAzO56k06TDVsyow93l6wj86fX6oL6q9k/QA lSBEveIRcya2k9A7vjtVzxwOJdlRXZ9Hx1JF12KWxKbkFIfiK+J8NyvpzOk5z7uw3KQ== X-Received: by 2002:a63:4a5a:: with SMTP id j26mr9001682pgl.361.1557326684610; Wed, 08 May 2019 07:44:44 -0700 (PDT) X-Google-Smtp-Source: APXvYqy+Wk2tXComJ8de/b5g4SCwf4zJfUE2dkXyBTsHRWUTOWxx7+J4I1K29v8LgIeIl2g2u+NZ X-Received: by 2002:a63:4a5a:: with SMTP id j26mr9001568pgl.361.1557326683390; Wed, 08 May 2019 07:44:43 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1557326683; cv=none; d=google.com; s=arc-20160816; b=YrkbF9DPwep9Hy8SLzGhQjjiq5cWemPz5IxM10tXyK88i/oWMjMDHR1i6+vr+7HgRH R/PLmgM2l8m3DGBpszEYJtdQMC1LTGtF21ymjoHrD/XpwNNBLGFiVL1K46LmrEtE1a0k EzQxyPUgulm+09Wdj9nIIAFwVHVyjWOsw+e0f34I/Pjeb81nXMcO6iXYBrqWDGxjZ+cz bojSzC7pXlO9UGZAb52CjCVeYRe6IWJwI3EZAeXY+MKW08C2PEJpwjMmZjXw8B2BZZ4i F3064YQ3vIu9pbIQEeKTS7F0mQ4tV66UsbWPcCoF+coqvAc46YEzDFWTwd87fGsRes7r Tdbg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from; bh=yWHOhsSwc3WWUoJslsLAWQcHXdi9Dc2j78/2TZTMTFI=; b=F0GMQzFGd5ZDhwOs2T9aAEy5ylssjO3W2uIL8dUlw91dwrdx8Zjzt5HeLMRn6uoWvV a5E6bqsyl6uHRtGD2ChbZm33I3eyZvDcM2KXsSz02LvMpZDaTXdV0pEj5TlItsNw7CIw Q8cicPHEjVruK7kT4QvbEElGEyBEwipAig/akWEuJl6P+B8+0ZOLnIsDD2HkNhmHRyln g4sbKS5WPC6JieCsUwu5m73Y9OHhX4LntiCno8RUGCojxK2mndsjrALnCQjb1F0uqhcX ZJ3eBW8yCxTdNgjjGb09y0wa+/W2nr8VA8tCYd88V2rkkCHmRIK3/Pvj33mm5pS8Sgwh wHGw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of kirill.shutemov@linux.intel.com designates 192.55.52.136 as permitted sender) smtp.mailfrom=kirill.shutemov@linux.intel.com; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: from mga12.intel.com (mga12.intel.com. [192.55.52.136]) by mx.google.com with ESMTPS id s184si23372828pfs.275.2019.05.08.07.44.43 for <linux-mm@kvack.org> (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 08 May 2019 07:44:43 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of kirill.shutemov@linux.intel.com designates 192.55.52.136 as permitted sender) client-ip=192.55.52.136; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of kirill.shutemov@linux.intel.com designates 192.55.52.136 as permitted sender) smtp.mailfrom=kirill.shutemov@linux.intel.com; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 08 May 2019 07:44:43 -0700 X-ExtLoop1: 1 Received: from black.fi.intel.com ([10.237.72.28]) by fmsmga001.fm.intel.com with ESMTP; 08 May 2019 07:44:39 -0700 Received: by black.fi.intel.com (Postfix, from userid 1000) id 74047949; Wed, 8 May 2019 17:44:29 +0300 (EEST) From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> To: Andrew Morton <akpm@linux-foundation.org>, x86@kernel.org, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>, Borislav Petkov <bp@alien8.de>, Peter Zijlstra <peterz@infradead.org>, Andy Lutomirski <luto@amacapital.net>, David Howells <dhowells@redhat.com> Cc: Kees Cook <keescook@chromium.org>, Dave Hansen <dave.hansen@intel.com>, Kai Huang <kai.huang@linux.intel.com>, Jacob Pan <jacob.jun.pan@linux.intel.com>, Alison Schofield <alison.schofield@intel.com>, linux-mm@kvack.org, kvm@vger.kernel.org, keyrings@vger.kernel.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Subject: [PATCH, RFC 16/62] x86/mm: Allow to disable MKTME after enumeration Date: Wed, 8 May 2019 17:43:36 +0300 Message-Id: <20190508144422.13171-17-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190508144422.13171-1-kirill.shutemov@linux.intel.com> References: <20190508144422.13171-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: <linux-mm.kvack.org> X-Virus-Scanned: ClamAV using ClamSMTP |
Series |
Intel MKTME enabling
|
expand
|
diff --git a/arch/x86/include/asm/mktme.h b/arch/x86/include/asm/mktme.h index 6e604126f0bc..454d6d7c791d 100644 --- a/arch/x86/include/asm/mktme.h +++ b/arch/x86/include/asm/mktme.h @@ -18,6 +18,8 @@ static inline bool mktme_enabled(void) return static_branch_unlikely(&mktme_enabled_key); } +void mktme_disable(void); + extern struct page_ext_operations page_mktme_ops; #define page_keyid page_keyid @@ -68,6 +70,9 @@ static inline bool mktme_enabled(void) { return false; } + +static inline void mktme_disable(void) {} + #endif #endif diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c index 4c9fadb57a13..f402a74c00a1 100644 --- a/arch/x86/kernel/cpu/intel.c +++ b/arch/x86/kernel/cpu/intel.c @@ -618,10 +618,7 @@ static void detect_tme(struct cpuinfo_x86 *c) * We must not allow onlining secondary CPUs with non-matching * configuration. */ - physical_mask = (1ULL << __PHYSICAL_MASK_SHIFT) - 1; - mktme_keyid_mask = 0; - mktme_keyid_shift = 0; - mktme_nr_keyids = 0; + mktme_disable(); } #endif diff --git a/arch/x86/mm/mktme.c b/arch/x86/mm/mktme.c index 43489c098e60..9221c894e8e9 100644 --- a/arch/x86/mm/mktme.c +++ b/arch/x86/mm/mktme.c @@ -15,6 +15,16 @@ int mktme_keyid_shift; DEFINE_STATIC_KEY_FALSE(mktme_enabled_key); EXPORT_SYMBOL_GPL(mktme_enabled_key); +void mktme_disable(void) +{ + physical_mask = (1ULL << __PHYSICAL_MASK_SHIFT) - 1; + mktme_keyid_mask = 0; + mktme_keyid_shift = 0; + mktme_nr_keyids = 0; + if (mktme_enabled()) + static_branch_disable(&mktme_enabled_key); +} + static bool need_page_mktme(void) { /* Make sure keyid doesn't collide with extended page flags */
The new helper mktme_disable() allows to disable MKTME even if it's enumerated successfully. MKTME initialization may fail and this functionality allows system to boot regardless of the failure. MKTME needs per-KeyID direct mapping. It requires a lot more virtual address space which may be a problem in 4-level paging mode. If the system has more physical memory than we can handle with MKTME the feature allows to fail MKTME, but boot the system successfully. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> --- arch/x86/include/asm/mktme.h | 5 +++++ arch/x86/kernel/cpu/intel.c | 5 +---- arch/x86/mm/mktme.c | 10 ++++++++++ 3 files changed, 16 insertions(+), 4 deletions(-)