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 83617568FC2; Tue, 22 Sep 2026 17:14:35 +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=1790097277; cv=none; b=SK1a1gGHIj+nNzIzUw0O0l4EXzTUhSngFtCAcwR1XwQu+ycK3K1D1xr9KEK2rcNyV1fjDD0O8OYgKJkKl18SL8sH7/Nw065gf5Sesvb6qid9cOKYbvgKW2XFJ+0N6IVnAZspuvMKJHCbPZyNrtSvIzHndZ38447el4+mNWf/pfo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790097277; c=relaxed/simple; bh=SNK4rrwFvjnxcdknL2hsc20bUzMvwr6CIipWYMszSzs=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=ImYtIrZwiZuuetaNliTu9M1aEy0d2WhGHBmhExUoh7Tg4RUbiSpSXGFOujtFCepVoUdyqE6CTSvWZqb8yEVILrHPwTY6bytLHMIcS0dVLfNHy4gFSPkr9Ha1eyLwG5hiYFKUWfAwuhZyXZtM0nnLwsw3Uf9c1NoruJpStkAcfQE= 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=iARAx8Qy; 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="iARAx8Qy" 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 777261576; Tue, 22 Sep 2026 10:14:31 -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 50FAF3FA32; Tue, 22 Sep 2026 10:14:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1790097275; bh=SNK4rrwFvjnxcdknL2hsc20bUzMvwr6CIipWYMszSzs=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=iARAx8Qyk1413VBr4PC7dGwIhlrToaTnagZ6dPlvezmqEddDjaVkHLgBTgS5wWhxt NG3MjS+xmLq1vZyn83oVsYzSt8u9iMTTXB3k+0eeRFDj4F3gou8popZy7lpyXeDKr4 SHUdvtaZmDDnMdNPXUZnhs8extIVv21cyFM4/8oM= From: Muhammad Usama Anjum Date: Tue, 22 Sep 2026 18:12:35 +0100 Subject: [PATCH v3 7/9] mm/kasan: use hw_pte_t for the early shadow PTE table 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-v3-7-5670b8cb9059@arm.com> References: <20260922-pte0-v3-0-5670b8cb9059@arm.com> In-Reply-To: <20260922-pte0-v3-0-5670b8cb9059@arm.com> To: Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Xu Xin , Chengming Zhou , Jann Horn , Muchun Song , Oscar Salvador , Pedro Falcato , Arnd Bergmann , Will Deacon , "Aneesh Kumar K.V" , Nick Piggin , Peter Zijlstra , Pasha Tatashin , Rik van Riel , Harry Yoo , Lance Yang , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , Barry Song , Youngjun Park , Uladzislau Rezki , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Martin KaFai Lau , Song Liu , Yonghong Song , Jiri Olsa , Emil Tsalapatis , Ihor Solodrai , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Ian Rogers , Adrian Hunter , James Clark , SJ Park , "Matthew Wilcox (Oracle)" , Jan Kara , Jason Gunthorpe , John Hubbard , Peter Xu , Leon Romanovsky , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Usama Arif , Kiryl Shutsemau , Andrey Ryabinin , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , Miaohe Lin , Naoya Horiguchi , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Dennis Zhou , Tejun Heo , Christoph Lameter , Johannes Weiner , Qi Zheng , Shakeel Butt , Axel Rasmussen , Yuanchu Xie , Wei Xu , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , David Airlie , Simona Vetter , Juergen Gross , Stefano Stabellini , Oleksandr Tyshchenko Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-trace-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-perf-users@vger.kernel.org, damon@lists.linux.dev, kasan-dev@googlegroups.com, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, xen-devel@lists.xenproject.org, Muhammad Usama Anjum X-Mailer: b4 0.16.0 kasan_early_shadow_pte is a complete PTE table rather than a software PTE value. Declare and define its elements as hw_pte_t so the object uses the PTE table storage type. Read the first element through ptep_get(), which returns the software PTE value expected by note_page_pte(), instead of accessing hw_pte_t storage directly. This also uses the accessor selected by the architecture. No architecture selects ARCH_HAS_HW_PTE_T at this point, so the storage representation remains unchanged. Signed-off-by: Muhammad Usama Anjum --- Changes since v1: - Use software PTE value terminology. Changes since RFC v1: - Update the description for the architecture opt-in model. --- include/linux/kasan.h | 2 +- mm/kasan/init.c | 2 +- mm/ptdump.c | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) diff --git a/include/linux/kasan.h b/include/linux/kasan.h index bf233bde68c7e..ff41949c0ac08 100644 --- a/include/linux/kasan.h +++ b/include/linux/kasan.h @@ -51,7 +51,7 @@ typedef unsigned int __bitwise kasan_vmalloc_flags_t; #endif extern unsigned char kasan_early_shadow_page[PAGE_SIZE]; -extern pte_t kasan_early_shadow_pte[MAX_PTRS_PER_PTE + PTE_HWTABLE_PTRS]; +extern hw_pte_t kasan_early_shadow_pte[MAX_PTRS_PER_PTE + PTE_HWTABLE_PTRS]; extern pmd_t kasan_early_shadow_pmd[MAX_PTRS_PER_PMD]; extern pud_t kasan_early_shadow_pud[MAX_PTRS_PER_PUD]; extern p4d_t kasan_early_shadow_p4d[MAX_PTRS_PER_P4D]; diff --git a/mm/kasan/init.c b/mm/kasan/init.c index 30c5266eaf37e..9bbc2a41d23f0 100644 --- a/mm/kasan/init.c +++ b/mm/kasan/init.c @@ -64,7 +64,7 @@ static inline bool kasan_pmd_table(pud_t pud) return false; } #endif -pte_t kasan_early_shadow_pte[MAX_PTRS_PER_PTE + PTE_HWTABLE_PTRS] +hw_pte_t kasan_early_shadow_pte[MAX_PTRS_PER_PTE + PTE_HWTABLE_PTRS] __bss_pgtbl; static inline bool kasan_pte_table(pmd_t pmd) diff --git a/mm/ptdump.c b/mm/ptdump.c index 376880071ca2a..8f19f20be3c44 100644 --- a/mm/ptdump.c +++ b/mm/ptdump.c @@ -19,7 +19,7 @@ static inline int note_kasan_page_table(struct mm_walk *walk, { struct ptdump_state *st = walk->private; - st->note_page_pte(st, addr, kasan_early_shadow_pte[0]); + st->note_page_pte(st, addr, ptep_get(kasan_early_shadow_pte)); walk->action = ACTION_CONTINUE; -- 2.47.3