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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 94624C88E70 for ; Mon, 14 Sep 2026 13:52:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=rvR7yrUSwk1xcghd++XGcB+fD9fDR6mY3VUkLEOBRnU=; b=MslPnPcAT4R+B9Gwrup4hNZs4U evwnfZ1GjMEwJJfPpbfJ75N12mg4ptzP6a10kI9FCl5jmdWw8SWJhPVAdXSPD8fI1cWfafPBMFser LrCpsmlnQU240ogohW3AcnGge3jvwpZWEXVqXTvtrY70U/EiQWDJezUKUFs1zitxrbn+JeYqCv0t6 Fa+QH0oM0lBCwwlZoAe5hJPBZDTU9Ka97vAQK4ZG30n53XnDhBYhxCPpq0h/QzOlQ7qoyrQsqBHy9 eENjIBZD6w7WNekaNHk4LXmLj9JBir5rm7SKXLBNyAfOp2BTm6i0EYpEJrNGH53LhH98NlR4vpG4R ht4ARIgQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x676g-00000003rpv-0wWn; Mon, 14 Sep 2026 13:52:26 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x676W-00000003rio-2RZs for linux-arm-kernel@lists.infradead.org; Mon, 14 Sep 2026 13:52:17 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 544C41576; Mon, 14 Sep 2026 06:52:12 -0700 (PDT) Received: from [127.0.1.1] (e142334-100.cambridge.arm.com [10.2.198.93]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id B236F3F882; Mon, 14 Sep 2026 06:52:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1789393935; bh=yv6552mFvvf13JAoUBxhYSH5LMmG+s9tUQsoS51fbNQ=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=gzbKM8Ca28zZ5K6P5ERV+/fCGpEVK/cv9jlKFw2gr9//PfYHgZprGWfo191uCCc6z Cf7m0v8/apWMpqmmgMHBA6J9VkXnoRe1GIpcuZ12FSGnPYjHDPuGZmC5Cob7BBesv6 pyrAeo+x1fR1GNNgGI02k3iSQRVZhxr9ZAy5zTgQ= From: Muhammad Usama Anjum Date: Mon, 14 Sep 2026 14:51:33 +0100 Subject: [PATCH 3/6] arm64: convert between HW PTEs and SW PTE values MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260914-pte0_arm-v1-3-bb53b663e396@arm.com> References: <20260914-pte0_arm-v1-0-bb53b663e396@arm.com> In-Reply-To: <20260914-pte0_arm-v1-0-bb53b663e396@arm.com> To: Catalin Marinas , Will Deacon , Mark Rutland , Ard Biesheuvel , Ilias Apalodimas , Andrey Ryabinin , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org, kasan-dev@googlegroups.com, linux-mm@kvack.org, Muhammad Usama Anjum X-Mailer: b4 0.16.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260914_065216_725903_12D385A0 X-CRM114-Status: GOOD ( 12.95 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org __ptep_get() returns a SW PTE value, and __set_pte_nosync() accepts one. When HW PTEs use a distinct hw_pte_t, directly reading or writing *ptep as a SW PTE value no longer satisfies those interfaces. Use __pte_from_hw after READ_ONCE() to obtain a SW PTE value and add __hw_pte before WRITE_ONCE() to form an HW PTE. Define __hw_pte for both the wrapper and alias configurations so the same accessor code works in either case. Signed-off-by: Muhammad Usama Anjum --- arch/arm64/include/asm/pgtable.h | 4 ++-- include/linux/pgtable_types.h | 2 ++ 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 4768ec59de555..67c4a6179e154 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -360,7 +360,7 @@ static inline pte_t pte_clear_uffd(pte_t pte) static inline void __set_pte_nosync(hw_pte_t *ptep, pte_t pte) { - WRITE_ONCE(*ptep, pte); + WRITE_ONCE(*ptep, __hw_pte(pte)); } static inline void __set_pte_complete(pte_t pte) @@ -381,7 +381,7 @@ static inline void __set_pte(hw_pte_t *ptep, pte_t pte) static inline pte_t __ptep_get(hw_pte_t *ptep) { - return READ_ONCE(*ptep); + return __pte_from_hw(READ_ONCE(*ptep)); } extern void __sync_icache_dcache(pte_t pteval); diff --git a/include/linux/pgtable_types.h b/include/linux/pgtable_types.h index ee4eace5c3e1c..b5862a16aa497 100644 --- a/include/linux/pgtable_types.h +++ b/include/linux/pgtable_types.h @@ -9,11 +9,13 @@ #ifdef CONFIG_ARCH_HAS_HW_PTE_T typedef struct __hw_pte_t { pte_t __pte; } hw_pte_t; #define __pte_from_hw(pte) ((pte).__pte) +#define __hw_pte(pte) ((hw_pte_t) { (pte) }) #define hw_pte_val(x) pte_val((x).__pte) #else #define hw_pte_t pte_t #define __pte_from_hw(pte) (pte) +#define __hw_pte(pte) (pte) #define hw_pte_val(x) pte_val(x) #endif -- 2.47.3