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Shutemov" X-Patchwork-Id: 11068145 Return-Path: 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 1C62A746 for ; Wed, 31 Jul 2019 15:10:18 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 00A2220564 for ; Wed, 31 Jul 2019 15:10:18 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E886E205E9; Wed, 31 Jul 2019 15:10:17 +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=-7.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E989520500 for ; Wed, 31 Jul 2019 15:10:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388509AbfGaPIX (ORCPT ); Wed, 31 Jul 2019 11:08:23 -0400 Received: from mail-ed1-f67.google.com ([209.85.208.67]:44786 "EHLO mail-ed1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388460AbfGaPIW (ORCPT ); Wed, 31 Jul 2019 11:08:22 -0400 Received: by mail-ed1-f67.google.com with SMTP id k8so65977852edr.11 for ; Wed, 31 Jul 2019 08:08:21 -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=iUFTIkzD0AEWQDnWiQSmBU6zhO1n8aNV0ScoY6j3b3g=; b=HrgukcbYAcj6z3TpaDjKhK1/cgEcnxMbqeCU6Z/toHInRTYK6v2mWxxYMVteRX1xIk H1k6zrMLrZvNf3OAcKFKHshR34yCCmm8hkHbTXc/YrWwnbcihOhBQ0QeMMCucKpTXxpJ SJC4bsE6hnX5Rp4f6xYDboqRRzvNcWl/MiRQZXEUpfajjat/tIUHsWvIPZyG+FaU+HAd 1t5RRpHWiXhY/ui/+qO7VOSTp4HsT+a5HDJIKwBC/BlgUgnjNplUOJAe8hTaTHztfKP/ QXniR7rebS1A+SHJF4GOUe6R1UGSYs9thlag8rbM3PX/uQL9LPZT7zM4jHRHS0tsN4XL rrDA== 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=iUFTIkzD0AEWQDnWiQSmBU6zhO1n8aNV0ScoY6j3b3g=; b=O778+fKBFoJIwuh4Dkw2KqVvKRu1lXkSm/Thaa5RHLEIW/wl20QJTvblXafrUALY9F i4myX3Ov9eDtYi0CDn2glqLA/u4y8IFmUx9Mfnrp2FHDW9V2J+uNPanHE6rYkF0pqwWo NIQ0zJ297l9e0P6/VjBSUMfs1yQc3AXObpMIMPQ8bWyr+07jtDzX0PUqg4sEhCmI0kVH Nv9ENcG80kLGhowV/cLVKexEKpBdPtwaCF3ZdcLF7FpDJXyrf04h3amU/pr8t/o9huh3 Xcz6BaWl3o8likKtpOZc0ZHXIhQtFVncLBcB33lauqm62MiTfAgS85O9bDqe8NlYRjrq iWzQ== X-Gm-Message-State: APjAAAV8TGjIO4YqOlUd2h28Ysf6zNn9bAgu3LbA+s8O7k0ipYr61mEG szgVEiThGihmxtNLcabHn/A= X-Google-Smtp-Source: APXvYqzYj85HAgTooG0QaW9NsjqZtZHRdbLp9Q2J1lz2TGQD3rqCjiCzCypUPluaUdrMl5P/zGF3dA== X-Received: by 2002:a50:b6ce:: with SMTP id f14mr103054546ede.236.1564585700501; Wed, 31 Jul 2019 08:08:20 -0700 (PDT) Received: from box.localdomain ([86.57.175.117]) by smtp.gmail.com with ESMTPSA id fk15sm12674271ejb.42.2019.07.31.08.08.17 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 31 Jul 2019 08:08:19 -0700 (PDT) From: "Kirill A. Shutemov" X-Google-Original-From: "Kirill A. Shutemov" Received: by box.localdomain (Postfix, from userid 1000) id 1246910131C; 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 05/59] mm/page_alloc: Handle allocation for encrypted memory Date: Wed, 31 Jul 2019 18:07:19 +0300 Message-Id: <20190731150813.26289-6-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 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP For encrypted memory, we need to allocate pages for a specific encryption KeyID. There are two cases when we need to allocate a page for encryption: - Allocation for an encrypted VMA; - Allocation for migration of encrypted page; The first case can be covered within alloc_page_vma(). We know KeyID from the VMA. The second case requires few new page allocation routines that would allocate the page for a specific KeyID. An encrypted page has to be cleared after KeyID set. This is handled in prep_encrypted_page() that will be provided by arch-specific code. Any custom allocator that deals with encrypted pages has to call prep_encrypted_page() too. See compaction_alloc() for instance. Signed-off-by: Kirill A. Shutemov --- include/linux/gfp.h | 50 +++++++++++++++++++++++++--- include/linux/migrate.h | 14 ++++++-- mm/compaction.c | 3 ++ mm/mempolicy.c | 27 +++++++++++---- mm/migrate.c | 4 +-- mm/page_alloc.c | 74 +++++++++++++++++++++++++++++++++++++++++ 6 files changed, 155 insertions(+), 17 deletions(-) diff --git a/include/linux/gfp.h b/include/linux/gfp.h index 3d4cb9fea417..014aef082821 100644 --- a/include/linux/gfp.h +++ b/include/linux/gfp.h @@ -463,16 +463,48 @@ static inline void arch_free_page(struct page *page, int order) { } static inline void arch_alloc_page(struct page *page, int order) { } #endif +#ifndef prep_encrypted_page +/* + * An architecture may override the helper to prepare the page + * to be used for with specific KeyID. To be called on encrypted + * page allocation. + */ +static inline void prep_encrypted_page(struct page *page, int order, + int keyid, bool zero) +{ +} +#endif + +/* + * Encrypted page has to be cleared once keyid is set, not on allocation. + */ +static inline bool deferred_page_zero(int keyid, gfp_t *gfp_mask) +{ + if (keyid && (*gfp_mask & __GFP_ZERO)) { + *gfp_mask &= ~__GFP_ZERO; + return true; + } + + return false; +} + struct page * __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, int preferred_nid, nodemask_t *nodemask); +struct page * +__alloc_pages_nodemask_keyid(gfp_t gfp_mask, unsigned int order, + int preferred_nid, nodemask_t *nodemask, int keyid); + static inline struct page * __alloc_pages(gfp_t gfp_mask, unsigned int order, int preferred_nid) { return __alloc_pages_nodemask(gfp_mask, order, preferred_nid, NULL); } +struct page *__alloc_pages_node_keyid(int nid, int keyid, + gfp_t gfp_mask, unsigned int order); + /* * Allocate pages, preferring the node given as nid. The node must be valid and * online. For more general interface, see alloc_pages_node(). @@ -500,6 +532,19 @@ static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, return __alloc_pages_node(nid, gfp_mask, order); } +static inline struct page *alloc_pages_node_keyid(int nid, int keyid, + gfp_t gfp_mask, unsigned int order) +{ + if (nid == NUMA_NO_NODE) + nid = numa_mem_id(); + + return __alloc_pages_node_keyid(nid, keyid, gfp_mask, order); +} + +extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order, + struct vm_area_struct *vma, unsigned long addr, + int node, bool hugepage); + #ifdef CONFIG_NUMA extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); @@ -508,14 +553,9 @@ alloc_pages(gfp_t gfp_mask, unsigned int order) { return alloc_pages_current(gfp_mask, order); } -extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order, - struct vm_area_struct *vma, unsigned long addr, - int node, bool hugepage); #else #define alloc_pages(gfp_mask, order) \ alloc_pages_node(numa_node_id(), gfp_mask, order) -#define alloc_pages_vma(gfp_mask, order, vma, addr, node, false)\ - alloc_pages(gfp_mask, order) #endif #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) #define alloc_page_vma(gfp_mask, vma, addr) \ diff --git a/include/linux/migrate.h b/include/linux/migrate.h index 7f04754c7f2b..a68516271c40 100644 --- a/include/linux/migrate.h +++ b/include/linux/migrate.h @@ -38,9 +38,16 @@ static inline struct page *new_page_nodemask(struct page *page, unsigned int order = 0; struct page *new_page = NULL; - if (PageHuge(page)) + if (PageHuge(page)) { + /* + * HugeTLB doesn't support encryption. We shouldn't see + * such pages. + */ + if (WARN_ON_ONCE(page_keyid(page))) + return NULL; return alloc_huge_page_nodemask(page_hstate(compound_head(page)), preferred_nid, nodemask); + } if (PageTransHuge(page)) { gfp_mask |= GFP_TRANSHUGE; @@ -50,8 +57,9 @@ static inline struct page *new_page_nodemask(struct page *page, if (PageHighMem(page) || (zone_idx(page_zone(page)) == ZONE_MOVABLE)) gfp_mask |= __GFP_HIGHMEM; - new_page = __alloc_pages_nodemask(gfp_mask, order, - preferred_nid, nodemask); + /* Allocate a page with the same KeyID as the source page */ + new_page = __alloc_pages_nodemask_keyid(gfp_mask, order, + preferred_nid, nodemask, page_keyid(page)); if (new_page && PageTransHuge(new_page)) prep_transhuge_page(new_page); diff --git a/mm/compaction.c b/mm/compaction.c index 9e1b9acb116b..874af83214b7 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -1559,6 +1559,9 @@ static struct page *compaction_alloc(struct page *migratepage, list_del(&freepage->lru); cc->nr_freepages--; + /* Prepare the page using the same KeyID as the source page */ + if (freepage) + prep_encrypted_page(freepage, 0, page_keyid(migratepage), false); return freepage; } diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 14ee933b1ff7..f79b4fa08c30 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -961,22 +961,29 @@ static void migrate_page_add(struct page *page, struct list_head *pagelist, /* page allocation callback for NUMA node migration */ struct page *alloc_new_node_page(struct page *page, unsigned long node) { - if (PageHuge(page)) + if (PageHuge(page)) { + /* + * HugeTLB doesn't support encryption. We shouldn't see + * such pages. + */ + if (WARN_ON_ONCE(page_keyid(page))) + return NULL; return alloc_huge_page_node(page_hstate(compound_head(page)), node); - else if (PageTransHuge(page)) { + } else if (PageTransHuge(page)) { struct page *thp; - thp = alloc_pages_node(node, + thp = alloc_pages_node_keyid(node, page_keyid(page), (GFP_TRANSHUGE | __GFP_THISNODE), HPAGE_PMD_ORDER); if (!thp) return NULL; prep_transhuge_page(thp); return thp; - } else - return __alloc_pages_node(node, GFP_HIGHUSER_MOVABLE | - __GFP_THISNODE, 0); + } else { + return __alloc_pages_node_keyid(node, page_keyid(page), + GFP_HIGHUSER_MOVABLE | __GFP_THISNODE, 0); + } } /* @@ -2053,9 +2060,13 @@ alloc_pages_vma(gfp_t gfp, int order, struct vm_area_struct *vma, { struct mempolicy *pol; struct page *page; - int preferred_nid; + bool deferred_zero; + int keyid, preferred_nid; nodemask_t *nmask; + keyid = vma_keyid(vma); + deferred_zero = deferred_page_zero(keyid, &gfp); + pol = get_vma_policy(vma, addr); if (pol->mode == MPOL_INTERLEAVE) { @@ -2097,6 +2108,8 @@ alloc_pages_vma(gfp_t gfp, int order, struct vm_area_struct *vma, page = __alloc_pages_nodemask(gfp, order, preferred_nid, nmask); mpol_cond_put(pol); out: + if (page) + prep_encrypted_page(page, order, keyid, deferred_zero); return page; } EXPORT_SYMBOL(alloc_pages_vma); diff --git a/mm/migrate.c b/mm/migrate.c index 8992741f10aa..c1b88eae71d8 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1873,7 +1873,7 @@ static struct page *alloc_misplaced_dst_page(struct page *page, int nid = (int) data; struct page *newpage; - newpage = __alloc_pages_node(nid, + newpage = __alloc_pages_node_keyid(nid, page_keyid(page), (GFP_HIGHUSER_MOVABLE | __GFP_THISNODE | __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN) & @@ -1999,7 +1999,7 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm, int page_lru = page_is_file_cache(page); unsigned long start = address & HPAGE_PMD_MASK; - new_page = alloc_pages_node(node, + new_page = alloc_pages_node_keyid(node, page_keyid(page), (GFP_TRANSHUGE_LIGHT | __GFP_THISNODE), HPAGE_PMD_ORDER); if (!new_page) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 272c6de1bf4e..963f959350e4 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -4046,6 +4046,53 @@ should_compact_retry(struct alloc_context *ac, unsigned int order, int alloc_fla } #endif /* CONFIG_COMPACTION */ +#ifndef CONFIG_NUMA +struct page *alloc_pages_vma(gfp_t gfp_mask, int order, + struct vm_area_struct *vma, unsigned long addr, + int node, bool hugepage) +{ + struct page *page; + bool deferred_zero; + int keyid = vma_keyid(vma); + + deferred_zero = deferred_page_zero(keyid, &gfp_mask); + page = alloc_pages(gfp_mask, order); + if (page) + prep_encrypted_page(page, order, keyid, deferred_zero); + + return page; +} +#endif + +/** + * __alloc_pages_node_keyid - allocate a page for a specific KeyID with + * preferred allocation node. + * @nid: the preferred node ID where memory should be allocated + * @keyid: KeyID to use + * @gfp_mask: GFP flags for the allocation + * @order: the page order + * + * Like __alloc_pages_node(), but prepares the page for a specific KeyID. + * + * Return: pointer to the allocated page or %NULL in case of error. + */ +struct page * __alloc_pages_node_keyid(int nid, int keyid, + gfp_t gfp_mask, unsigned int order) +{ + struct page *page; + bool deferred_zero; + + VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES); + VM_WARN_ON(!node_online(nid)); + + deferred_zero = deferred_page_zero(keyid, &gfp_mask); + page = __alloc_pages(gfp_mask, order, nid); + if (page) + prep_encrypted_page(page, order, keyid, deferred_zero); + + return page; +} + #ifdef CONFIG_LOCKDEP static struct lockdep_map __fs_reclaim_map = STATIC_LOCKDEP_MAP_INIT("fs_reclaim", &__fs_reclaim_map); @@ -4757,6 +4804,33 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, int preferred_nid, } EXPORT_SYMBOL(__alloc_pages_nodemask); +/** + * __alloc_pages_nodemask_keyid - allocate a page for a specific KeyID. + * @gfp_mask: GFP flags for the allocation + * @order: the page order + * @preferred_nid: the preferred node ID where memory should be allocated + * @nodemask: allowed nodemask + * @keyid: KeyID to use + * + * Like __alloc_pages_nodemask(), but prepares the page for a specific KeyID. + * + * Return: pointer to the allocated page or %NULL in case of error. + */ +struct page * +__alloc_pages_nodemask_keyid(gfp_t gfp_mask, unsigned int order, + int preferred_nid, nodemask_t *nodemask, int keyid) +{ + struct page *page; + bool deferred_zero; + + deferred_zero = deferred_page_zero(keyid, &gfp_mask); + page = __alloc_pages_nodemask(gfp_mask, order, preferred_nid, nodemask); + if (page) + prep_encrypted_page(page, order, keyid, deferred_zero); + return page; +} +EXPORT_SYMBOL(__alloc_pages_nodemask_keyid); + /* * Common helper functions. Never use with __GFP_HIGHMEM because the returned * address cannot represent highmem pages. Use alloc_pages and then kmap if