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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E357CFF8855 for ; Tue, 5 May 2026 16:08:50 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 56B396B00EF; Tue, 5 May 2026 12:08:50 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 5435B6B00F0; Tue, 5 May 2026 12:08:50 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 431966B00F1; Tue, 5 May 2026 12:08:50 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 2FEC06B00EF for ; Tue, 5 May 2026 12:08:50 -0400 (EDT) Received: from smtpin11.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay05.hostedemail.com (Postfix) with ESMTP id D07AB4054C for ; Tue, 5 May 2026 16:08:49 +0000 (UTC) X-FDA: 84733849578.11.BEEB1CD Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf02.hostedemail.com (Postfix) with ESMTP id 09DB58000A for ; Tue, 5 May 2026 16:08:47 +0000 (UTC) Authentication-Results: imf02.hostedemail.com; dkim=pass header.d=arm.com header.s=foss header.b=luXYCNaz; spf=pass (imf02.hostedemail.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=kevin.brodsky@arm.com; dmarc=pass (policy=none) header.from=arm.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1777997328; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=J18iXujFK8xYYFlyu0HbKoG2KQuU7cNGKxURAHEC0GA=; b=hNCa0qFV7pFAdWm7mC20a69eirfLCDv+NrVzRgqO+1h4uogb7Pbab493U1oW5MZszsJ7YN f6cnKukusomILG7ubkCCFYKoh+7bgYuisMsMbcwT2pz6GVxNIGc9vZXGIR2Pl9kwCzWzlS I6rFJdEcT5FF0xPAksJvUS9PqQBLxNk= ARC-Authentication-Results: i=1; imf02.hostedemail.com; dkim=pass header.d=arm.com header.s=foss header.b=luXYCNaz; spf=pass (imf02.hostedemail.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=kevin.brodsky@arm.com; dmarc=pass (policy=none) header.from=arm.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1777997328; a=rsa-sha256; cv=none; b=yHpz4QhfrzHQnmqOQlA8oTed4PPIyAU4fazKY3PbjAh03sO+3c6HupUFze+NSDbjCPVcOM znJPr7gXoS3Wqzx+0ZsmfTPb9R+zOMzXcPj98XUbFkGmlJ+6ejBq4qN6w2sMSZDQt2QcXf RIk5sIbu1iYonNIJy4YeKykC8woZjog= 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 E98B114BF; Tue, 5 May 2026 09:08:41 -0700 (PDT) Received: from localhost.localdomain (e123572-lin.cambridge.arm.com [10.1.194.54]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 2E6213F763; Tue, 5 May 2026 09:08:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1777997327; bh=XtqotHlvxdKu6c1pkEmCr60+1y0cB/ILuH7HTvPuXjw=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=luXYCNazICc3tK6Lo75rwne6t5UDBAIT/GSy+kZtqZUQSSE+SVirz/40QTelJkaZH JkYWQ7dTpIHd4QSAHQkyPD4tmU4aSFtVOzU4Qw9hg5SZ3yxDqLMi12/J4NzwvaWuli Q50N8srUXZ+PY0p0gwMmTpE+ZFjErQD3dNlgJVHg= From: Kevin Brodsky Date: Tue, 05 May 2026 17:06:12 +0100 Subject: [PATCH RFC v7 23/24] arm64: kpkeys: Enable kpkeys_hardened_pgtables support MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260505-kpkeys-v7-23-20c0bdd97197@arm.com> References: <20260505-kpkeys-v7-0-20c0bdd97197@arm.com> In-Reply-To: <20260505-kpkeys-v7-0-20c0bdd97197@arm.com> To: linux-hardening@vger.kernel.org Cc: Kevin Brodsky , Andrew Morton , Andy Lutomirski , Catalin Marinas , Dave Hansen , "David Hildenbrand (Arm)" , Ira Weiny , Jann Horn , Jeff Xu , Joey Gouly , Kees Cook , Linus Walleij , Marc Zyngier , Mark Brown , Matthew Wilcox , Maxwell Bland , "Mike Rapoport (IBM)" , Peter Zijlstra , Pierre Langlois , Quentin Perret , Rick Edgecombe , Ryan Roberts , Will Deacon , Yang Shi , Yeoreum Yun , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, x86@kernel.org, Lorenzo Stoakes , Thomas Gleixner , Vlastimil Babka X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1777997220; l=1336; i=kevin.brodsky@arm.com; s=20260427; h=from:subject:message-id; bh=XtqotHlvxdKu6c1pkEmCr60+1y0cB/ILuH7HTvPuXjw=; b=K2Hh5ueB1qxUS4zdYcT6VsETD5dVbzMYDFrOcezoE2+rc8YHsqgE1mD0JpP0LvBzLWt4INwPH FdSpumdToMxA5c8hwuqM1w/44U4enD9R0cEYEWjqIAXB1BF6Z84tYVy X-Developer-Key: i=kevin.brodsky@arm.com; a=ed25519; pk=N2QG+eJKrvkNovwhhwJhnJ4+ScVfsGCHldmqLfcMTFs= X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 09DB58000A X-Rspam-User: X-Stat-Signature: 96s5p3fwfcja9qsxhy7b5txi5x4u3xkr X-HE-Tag: 1777997327-159592 X-HE-Meta: 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 oK2apFe8 g9ei119zqDUnYVlDTXH+c04wmh+G66+1+y8A+qb9kZj9pfvO5WR7MKgS3PbXqv7aQI+qBe2bcSwMAi/hTNuF/FNmkF/esIfwwDwFpKzC1GmF8fq0bSfqxwMeMH4vSy5caX2+8FhlGFQk4sXs6yaq9nPt0TLLsjEyDPT9pce/J0ltOYO8XZ8TCVRR9XO3a1PShotRRkJiZnK5Ehy+H9oFLo+nKWNc8t+hiPs08h0poO3qgAyWz6gfA0SJSMhZuV0gem25QCxvIWfNMjkRAka6U246o5pU4Rp21Fz5McfDnjSjEcbc= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The kpkeys_hardened_pgtables feature needs to be initialised as soon as the buddy allocator becomes available. The canonical place to handle this is mem_init(). With that done, all the bits are in place and we can advertise support for kpkeys_hardened_pgtables by selecting ARCH_HAS_KPKEYS_HARDENED_PGTABLES if ARM64_POE is enabled. Signed-off-by: Kevin Brodsky --- arch/arm64/Kconfig | 1 + arch/arm64/mm/init.c | 1 + 2 files changed, 2 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index ab06324a50ae..43d3ab744535 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2146,6 +2146,7 @@ config ARM64_POE select ARCH_USES_HIGH_VMA_FLAGS select ARCH_HAS_PKEYS select ARCH_HAS_KPKEYS + select ARCH_HAS_KPKEYS_HARDENED_PGTABLES help The Permission Overlay Extension is used to implement Memory Protection Keys. Memory Protection Keys provides a mechanism for diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index 97987f850a33..7985045875cf 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -386,6 +386,7 @@ bool page_alloc_available __ro_after_init; void __init mem_init(void) { page_alloc_available = true; + kpkeys_hardened_pgtables_init(); swiotlb_update_mem_attributes(); } -- 2.51.2