From patchwork Tue Jun 27 03:14:01 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vishal Moola X-Patchwork-Id: 13293755 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 88700C001B1 for ; Tue, 27 Jun 2023 03:15:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229710AbjF0DPa (ORCPT ); Mon, 26 Jun 2023 23:15:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35972 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230145AbjF0DPW (ORCPT ); Mon, 26 Jun 2023 23:15:22 -0400 Received: from mail-yw1-x112e.google.com (mail-yw1-x112e.google.com [IPv6:2607:f8b0:4864:20::112e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 26A101991; Mon, 26 Jun 2023 20:15:15 -0700 (PDT) Received: by mail-yw1-x112e.google.com with SMTP id 00721157ae682-5701810884aso32951897b3.0; Mon, 26 Jun 2023 20:15:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1687835714; x=1690427714; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=g10wkISUfh+NWh/zmhT9FX+m3ZttfvdTUqPKBonJP24=; b=YbS6It5/jG4gj9GV1WnqlWfE48J9CdnxNvOxOEYb2jkpFBwkcijgogv5/2FTyBYSJu izIlhC4BKNDwS5s1e4kK9kflroiGbN+V3CM6t7L2EFgtcSkg+ReKLemBNYF5Y3oVXg4d FUK6TJROlYVwfl34r2gL5piZl88lZtnh5mJi4W6rFRki4guA/8D+KKFrkkfHcSu1EJOJ fncA5E4mKOaGZV6UHnLSf+mughQQ2/sG6vdU9OT//BnRvDPbrV7dVSZuLKiGxg9g4JB4 L4rqAG2yhTX1HWLW8k7KKi4wHWH5luhyXPrJQJ+E2hOyRozoqBZDlMJstEk3Y4X/0/Xj 8nVg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1687835714; x=1690427714; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=g10wkISUfh+NWh/zmhT9FX+m3ZttfvdTUqPKBonJP24=; b=R2ChFym9OaXz6+8/v8iXMDP1rSr5DqzfsCCRyS9wetW1xqOaohQv99jKB4DzY/pXsn SulEZ3tp2Cvt6+AczAKqxedBbeTE1T5D5LcKCh9IBLK541U8MZiWkDw2gyo3ks38H6x7 pMnOpa2jMfeSh1kszY5qqA+Hq8JdpQT54k0l07H0I3KaE33izgHVxi1cmHB0+KWCVpzc YHvnKQzGlRKesp/pJE2XSSvkBwZeZ1eWI+/eKFzdo6yI34Rd+sIqrm2r2JMo8YdlCz/o y/6+TsNGUZz79BMLi4jmBkOuhU96jLkLg6zSymkfY8yeKaJFtfbyoXr+K7hxukqosoUi i5aQ== X-Gm-Message-State: AC+VfDzP/rq2WsIyYc7TLt75Nrj6BURmYdHbMu3xMsKbY7MhIprp2GvS y6TexRchzS5yZmFnzyvvZWw= X-Google-Smtp-Source: ACHHUZ4trddfgXzjmNYnvfIX3UyOWVfVwt64/0k1X+1Ib62f54dPN/U9UUyskS0pcHiYwtqCWDYcTQ== X-Received: by 2002:a81:4e44:0:b0:56f:ff55:2b74 with SMTP id c65-20020a814e44000000b0056fff552b74mr21585770ywb.37.1687835714203; Mon, 26 Jun 2023 20:15:14 -0700 (PDT) Received: from unknowna0e70b2ca394.attlocal.net ([2600:1700:2f7d:1800::16]) by smtp.googlemail.com with ESMTPSA id s4-20020a0dd004000000b0057399b3bd26sm1614798ywd.33.2023.06.26.20.15.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 Jun 2023 20:15:13 -0700 (PDT) From: "Vishal Moola (Oracle)" To: Andrew Morton , Matthew Wilcox Cc: linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-openrisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org, Hugh Dickins , "Vishal Moola (Oracle)" , Mike Rapoport Subject: [PATCH v6 03/33] pgtable: Create struct ptdesc Date: Mon, 26 Jun 2023 20:14:01 -0700 Message-Id: <20230627031431.29653-4-vishal.moola@gmail.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230627031431.29653-1-vishal.moola@gmail.com> References: <20230627031431.29653-1-vishal.moola@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Currently, page table information is stored within struct page. As part of simplifying struct page, create struct ptdesc for page table information. Signed-off-by: Vishal Moola (Oracle) Acked-by: Mike Rapoport (IBM) --- include/linux/pgtable.h | 68 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index 5063b482e34f..d46cb709ce08 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -987,6 +987,74 @@ static inline void ptep_modify_prot_commit(struct vm_area_struct *vma, #endif /* __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION */ #endif /* CONFIG_MMU */ + +/** + * struct ptdesc - Memory descriptor for page tables. + * @__page_flags: Same as page flags. Unused for page tables. + * @pt_rcu_head: For freeing page table pages. + * @pt_list: List of used page tables. Used for s390 and x86. + * @_pt_pad_1: Padding that aliases with page's compound head. + * @pmd_huge_pte: Protected by ptdesc->ptl, used for THPs. + * @_pt_s390_gaddr: Aliases with page's mapping. Used for s390 gmap only. + * @pt_mm: Used for x86 pgds. + * @pt_frag_refcount: For fragmented page table tracking. Powerpc and s390 only. + * @ptl: Lock for the page table. + * @__page_type: Same as page->page_type. Unused for page tables. + * @_refcount: Same as page refcount. Used for s390 page tables. + * @pt_memcg_data: Memcg data. Tracked for page tables here. + * + * This struct overlays struct page for now. Do not modify without a good + * understanding of the issues. + */ +struct ptdesc { + unsigned long __page_flags; + + union { + struct rcu_head pt_rcu_head; + struct list_head pt_list; + struct { + unsigned long _pt_pad_1; + pgtable_t pmd_huge_pte; + }; + }; + unsigned long _pt_s390_gaddr; + + union { + struct mm_struct *pt_mm; + atomic_t pt_frag_refcount; + }; + + union { + unsigned long _pt_pad_2; +#if ALLOC_SPLIT_PTLOCKS + spinlock_t *ptl; +#else + spinlock_t ptl; +#endif + }; + unsigned int __page_type; + atomic_t _refcount; +#ifdef CONFIG_MEMCG + unsigned long pt_memcg_data; +#endif +}; + +#define TABLE_MATCH(pg, pt) \ + static_assert(offsetof(struct page, pg) == offsetof(struct ptdesc, pt)) +TABLE_MATCH(flags, __page_flags); +TABLE_MATCH(compound_head, pt_list); +TABLE_MATCH(compound_head, _pt_pad_1); +TABLE_MATCH(pmd_huge_pte, pmd_huge_pte); +TABLE_MATCH(mapping, _pt_s390_gaddr); +TABLE_MATCH(pt_mm, pt_mm); +TABLE_MATCH(ptl, ptl); +TABLE_MATCH(rcu_head, pt_rcu_head); +#ifdef CONFIG_MEMCG +TABLE_MATCH(memcg_data, pt_memcg_data); +#endif +#undef TABLE_MATCH +static_assert(sizeof(struct ptdesc) <= sizeof(struct page)); + /* * No-op macros that just return the current protection value. Defined here * because these macros can be used even if CONFIG_MMU is not defined.