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=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 8A263C32751 for ; Wed, 31 Jul 2019 15:10:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5D5C22064A for ; Wed, 31 Jul 2019 15:10:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=shutemov-name.20150623.gappssmtp.com header.i=@shutemov-name.20150623.gappssmtp.com header.b="BHAeXd7g" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388322AbfGaPKC (ORCPT ); Wed, 31 Jul 2019 11:10:02 -0400 Received: from mail-ed1-f65.google.com ([209.85.208.65]:37829 "EHLO mail-ed1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388533AbfGaPI0 (ORCPT ); Wed, 31 Jul 2019 11:08:26 -0400 Received: by mail-ed1-f65.google.com with SMTP id w13so66060906eds.4 for ; Wed, 31 Jul 2019 08:08:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=shutemov-name.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=JEZNWwFcWS55jw+6SIN48eCAvZTaxQLDv71jatzDjOE=; b=BHAeXd7gVXgBxYu3UUq38JWfB9LxZIY8nRNcqLidTcyniNbN1kGL7m8gr0DYCgHyfo bYCkEUg7twHqYl9//YYyF3oRucuIzp6d8krWu5AXZuwBtWBWqFWBt/UfnX3pxSNussqT vPwPX9shBW0HElOKWXJF5lb9bZsc1LRrg5iG4cMsZyUylv9NMvgzxJC+ak2MqH41uDGx kDLz4WiHVp5dMULHZ0AJck/7y17op+S1LY4RIr4iUP8aw3l+KaMe13SwSVOBLq30rQZD RxmVZou3sCnH16cwB+iAELC3TlHF1bUMdJfNLvVlBfrQL9P/s9szyRTBQ5Oj+oYcjPpJ mDPQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=JEZNWwFcWS55jw+6SIN48eCAvZTaxQLDv71jatzDjOE=; b=t6pmul2ZJ6LwxU84e6sqwBHGu5wGShNbJoqv1eTj4Y5z2lpVMJxXchLK3Hm3XWhsVx ByzH03S3li9o2d4ISQEpJnnkcen+kneL6Rx7Oesv0q9XqEoZq+0St9NFbZOoNpTetz9A 1/rxEpcc6ezVk5ePJVuViNNuLcdga8JZxWu7A3+XnNRGfbFVjY+gcjWVdI7Swbg5nOVl KgmI3znO/LuIiWeU2LjkvYKr4GKNPU9qkDjzTQ/RecsocjE1oNwetcZG54q9V7n2qe5a C0uJCHItxFQCuLKGtMkuyMqtkL1apIgSJ8VqDtr3iV6ZnuXbT3WPnkPgHzCALue6QcK0 lFvA== X-Gm-Message-State: APjAAAU9dlsA7PtFb8Az9xDAc4680ysL4U654NP7U+u0JXTg/fqPBc37 YyWJS7JekTsSOgGYZ5B7HBQ= X-Google-Smtp-Source: APXvYqwrlyk+jtOIzcQNAVf6976bJtJVVuXE4BPNEUU4FrC1EBQZ1KrsVfR+sDVvD7XGNJvKjIp/UA== X-Received: by 2002:a05:6402:1212:: with SMTP id c18mr108401816edw.7.1564585704701; Wed, 31 Jul 2019 08:08:24 -0700 (PDT) Received: from box.localdomain ([86.57.175.117]) by smtp.gmail.com with ESMTPSA id w14sm17419509eda.69.2019.07.31.08.08.20 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 31 Jul 2019 08:08:22 -0700 (PDT) From: "Kirill A. Shutemov" X-Google-Original-From: "Kirill A. Shutemov" Received: by box.localdomain (Postfix, from userid 1000) id 48F28101324; Wed, 31 Jul 2019 18:08:16 +0300 (+03) To: Andrew Morton , x86@kernel.org, Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Borislav Petkov , Peter Zijlstra , Andy Lutomirski , David Howells Cc: Kees Cook , Dave Hansen , Kai Huang , Jacob Pan , Alison Schofield , linux-mm@kvack.org, kvm@vger.kernel.org, keyrings@vger.kernel.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: [PATCHv2 13/59] x86/mm: Add a helper to retrieve KeyID for a VMA Date: Wed, 31 Jul 2019 18:07:27 +0300 Message-Id: <20190731150813.26289-14-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190731150813.26289-1-kirill.shutemov@linux.intel.com> References: <20190731150813.26289-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We store KeyID in upper bits for vm_page_prot that match position of KeyID in PTE. vma_keyid() extracts KeyID from vm_page_prot. With KeyID in vm_page_prot we don't need to modify any page table helper to propagate the KeyID to page table entires. Signed-off-by: Kirill A. Shutemov --- arch/x86/include/asm/mktme.h | 12 ++++++++++++ arch/x86/mm/mktme.c | 7 +++++++ 2 files changed, 19 insertions(+) diff --git a/arch/x86/include/asm/mktme.h b/arch/x86/include/asm/mktme.h index 46041075f617..52b115b30a42 100644 --- a/arch/x86/include/asm/mktme.h +++ b/arch/x86/include/asm/mktme.h @@ -5,6 +5,8 @@ #include #include +struct vm_area_struct; + #ifdef CONFIG_X86_INTEL_MKTME extern phys_addr_t __mktme_keyid_mask; extern phys_addr_t mktme_keyid_mask(void); @@ -31,6 +33,16 @@ static inline int page_keyid(const struct page *page) return lookup_page_ext(page)->keyid; } +#define vma_keyid vma_keyid +int __vma_keyid(struct vm_area_struct *vma); +static inline int vma_keyid(struct vm_area_struct *vma) +{ + if (!mktme_enabled()) + return 0; + + return __vma_keyid(vma); +} + #else #define mktme_keyid_mask() ((phys_addr_t)0) #define mktme_nr_keyids() 0 diff --git a/arch/x86/mm/mktme.c b/arch/x86/mm/mktme.c index 48c2d4c97356..d02867212e33 100644 --- a/arch/x86/mm/mktme.c +++ b/arch/x86/mm/mktme.c @@ -1,3 +1,4 @@ +#include #include /* Mask to extract KeyID from physical address. */ @@ -48,3 +49,9 @@ struct page_ext_operations page_mktme_ops = { .need = need_page_mktme, .init = init_page_mktme, }; + +int __vma_keyid(struct vm_area_struct *vma) +{ + pgprotval_t prot = pgprot_val(vma->vm_page_prot); + return (prot & mktme_keyid_mask()) >> mktme_keyid_shift(); +} -- 2.21.0