From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 7CA0252268A; Tue, 22 Sep 2026 17:33:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790098391; cv=none; b=E0MhHNBelC1EPTU3e++yIfyLmK9Z/VdxjpiXJuWL5L0zE+m49NIF3uaTJIAic2lnqOvaFe+I8yR+KuvEINwyupNLZRv6uCzhVj1ZtuzF4iIbg4oMeMG66y4TMx42GUKnx7SrbY2wzGWsiGJu/s+/3klya6TH3dfjjrND53vM5aI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790098391; c=relaxed/simple; bh=67NvP4PmpCnowWkBeuojZg3SSMqBMwtXDXBIbaFjYiY=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=uHwq+7aCuo45ROmWiI7pMvoBq3Kz6aezIBYKao3qQjX8cuTuFrf36vCYU0RADACHzgRXR81V9vSNn1LBzEJYvGtIkes6ZvxGt3gStGEzRoyb7NOtUAyEgsd8oISKF/iWBRH6ZAX3Ev5X0z9F/GDwpa+wxfCfsbjvCXTqQBD0IcY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=DgfsXpYX; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="DgfsXpYX" 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 0F2AC1AED; Tue, 22 Sep 2026 10:32:58 -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 269643F86C; Tue, 22 Sep 2026 10:32:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1790098381; bh=67NvP4PmpCnowWkBeuojZg3SSMqBMwtXDXBIbaFjYiY=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=DgfsXpYXf+AULhg9SSync9g0KRdJYDwFtPkkElJ/a+wWRq0XRp4XhA/+AQcIjVicE yO9uEDNDRHS6qYUxgDmH4JNy09PlmpfEqfv0MLS+ymlFYbWBDTSK3ieWYmPBLASNUU 5DDokOnKTfjJP4/bugtIcH+JIC+awj5G0TJ4BSC4= From: Muhammad Usama Anjum Date: Tue, 22 Sep 2026 18:31:58 +0100 Subject: [PATCH v2 3/6] arm64: use hw_pte_val for HW PTE loads and stores Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260922-pte0_arm-v2-3-a3f1ddff0a8a@arm.com> References: <20260922-pte0_arm-v2-0-a3f1ddff0a8a@arm.com> In-Reply-To: <20260922-pte0_arm-v2-0-a3f1ddff0a8a@arm.com> To: Catalin Marinas , Will Deacon , Mark Rutland , Ryan Roberts , 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 __ptep_get() returns a SW PTE value, while __set_pte_nosync() accepts one. When HW PTE storage uses a distinct hw_pte_t, reading or writing *ptep as a pte_t no longer satisfies those interfaces. Use hw_pte_val() to expose the pteval_t stored in either the hw_pte_t wrapper or its pte_t alias. __set_pte_nosync() writes pte_val(pte) to that storage, while __ptep_get() reads it and reconstructs a pte_t with __pte(). This avoids imposing a generic conversion interface between HW and SW PTE representations, which may require architecture-specific context in the future. Signed-off-by: Muhammad Usama Anjum --- arch/arm64/include/asm/pgtable.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 4768ec59de555..ce6580ab63128 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(hw_pte_val(*ptep), pte_val(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(READ_ONCE(hw_pte_val(*ptep))); } extern void __sync_icache_dcache(pte_t pteval); -- 2.47.3