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 CDC8F47DF93; Tue, 14 Jul 2026 14:07:38 +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=1784038061; cv=none; b=bk+L0Nx3jBrvVc88WP2LuWHD6N8ZOAzSQYGxm8hYzXIMvUKT2wuZ1mLzj+7ZmqxDqXJaF5K1uckZ76hnoZLEWK3LNA+MxjuyJf7+uZjfVRslC+D2xXCrkKxws5XJjUCgJKnvGZfzEX2fYellZqLUPG5ldD1xtJuWSmx3F0zJGZA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784038061; c=relaxed/simple; bh=VrWlMtHqgM/vx22jiN3vYsU+W1Lh9jxCM8/DJ3H1HHw=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Rbkc3wmv9hZJbbYhAGmYTG18ETEm39SbusiHPiRp1E+vjsQZSJwcoVsnVLt/nQvIhnSLXSPgtNBkZ5geziYuF0v/pLF4D7O69OWJ2SJxVEIHmTKfaPBSlNbQZ7qxhYm/dBR5JtfUrm+VsgtqaHg7ExQoYQJ/N4TmJ1eRePbdejM= 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=X2EPALpi; 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="X2EPALpi" 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 B5D141CE0; Tue, 14 Jul 2026 07:07:32 -0700 (PDT) Received: from localhost.localdomain (e123572-lin.cambridge.arm.com [10.2.208.46]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 8FA7E3F7B4; Tue, 14 Jul 2026 07:07:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1784038057; bh=VrWlMtHqgM/vx22jiN3vYsU+W1Lh9jxCM8/DJ3H1HHw=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=X2EPALpiGXj7jZ//umW0i2ZiscPs5c3b9FVhjQsTjSc/roIUOCw5ccwKbAM8AZVT0 R190qpIisEqdGcWQOaI8LP3WSMdBvOg2L0DaCq9z+740FCzemmIORnkMA6TGphJBf+ c9VjfZElkzX4N0E1s95w/Vtd50JJkhxZY+d0MtYw= From: Kevin Brodsky Date: Tue, 14 Jul 2026 15:04:08 +0100 Subject: [PATCH 19/22] x86/tboot: mark tboot_mm as a kernel mm Precedence: bulk X-Mailing-List: linux-parisc@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: <20260714-remove_pgtable_cdtor-v1-19-44be8a7685d7@arm.com> References: <20260714-remove_pgtable_cdtor-v1-0-44be8a7685d7@arm.com> In-Reply-To: <20260714-remove_pgtable_cdtor-v1-0-44be8a7685d7@arm.com> To: linux-mm@kvack.org Cc: Kevin Brodsky , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Pasha Tatashin , Russell King , Catalin Marinas , Will Deacon , Ryan Roberts , linux-arm-kernel@lists.infradead.org, Huacai Chen , loongarch@lists.linux.dev, "James E.J. Bottomley" , Helge Deller , linux-parisc@vger.kernel.org, Madhavan Srinivasan , Michael Ellerman , linuxppc-dev@lists.ozlabs.org, Paul Walmsley , Palmer Dabbelt , Albert Ou , linux-riscv@lists.infradead.org, Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Gerald Schaefer , linux-s390@vger.kernel.org, "David S. Miller" , Andreas Larsson , sparclinux@vger.kernel.org, Richard Weinberger , Anton Ivanov , Johannes Berg , linux-um@lists.infradead.org, Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Andy Lutomirski , Peter Zijlstra , Ning Sun , x86@kernel.org, tboot-devel@lists.sourceforge.net, Ard Biesheuvel , Ilias Apalodimas , linux-efi@vger.kernel.org, Vishal Moola , Alistair Popple , "Matthew Wilcox (Oracle)" , linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1784037902; l=1553; i=kevin.brodsky@arm.com; s=20260427; h=from:subject:message-id; bh=VrWlMtHqgM/vx22jiN3vYsU+W1Lh9jxCM8/DJ3H1HHw=; b=m8zZWjxysI7gu08ZC5WjroF8ppS2XmCi+NSg9AchPnK6c6wz3EcnLIwt4UrkZ1Tknhd8Uq+lO humwu8pswzNB3IZSFZsQqWeKm+RG8SsPRg6CN1eLU7ZKufXomLaUKal X-Developer-Key: i=kevin.brodsky@arm.com; a=ed25519; pk=N2QG+eJKrvkNovwhhwJhnJ4+ScVfsGCHldmqLfcMTFs= tboot_mm is a kernel-owned address space used to build the identity map for tboot shutdown. Mark it with MMF_KERNEL so page table allocation and initialisation code treats its page tables as kernel page tables. Having marked tboot_mm as a kernel mm, we also need to convert pte_alloc_map() (user PTE) to pte_alloc_kernel() (kernel PTE), and drop the matching pte_unmap(). Assisted-by: Codex:GPT-5.5 Signed-off-by: Kevin Brodsky --- arch/x86/kernel/tboot.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c index 46b8f1f16676..08c899f88e41 100644 --- a/arch/x86/kernel/tboot.c +++ b/arch/x86/kernel/tboot.c @@ -99,6 +99,7 @@ static struct mm_struct tboot_mm = { .pgd = swapper_pg_dir, .mm_users = ATOMIC_INIT(2), .mm_count = ATOMIC_INIT(1), + .flags = MM_FLAGS_INIT(MMF_KERNEL_MASK), .write_protect_seq = SEQCNT_ZERO(tboot_mm.write_protect_seq), MMAP_LOCK_INITIALIZER(init_mm) .page_table_lock = __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock), @@ -129,11 +130,10 @@ static int map_tboot_page(unsigned long vaddr, unsigned long pfn, pmd = pmd_alloc(&tboot_mm, pud, vaddr); if (!pmd) return -1; - pte = pte_alloc_map(&tboot_mm, pmd, vaddr); + pte = pte_alloc_kernel(pmd, vaddr); if (!pte) return -1; set_pte_at(&tboot_mm, vaddr, pte, pfn_pte(pfn, prot)); - pte_unmap(pte); /* * PTI poisons low addresses in the kernel page tables in the -- 2.51.2