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 402AAFEFB6E for ; Fri, 27 Feb 2026 17:56:15 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id A02046B0095; Fri, 27 Feb 2026 12:56:14 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 9A2AD6B0096; Fri, 27 Feb 2026 12:56:14 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 887D46B0098; Fri, 27 Feb 2026 12:56:14 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 741636B0095 for ; Fri, 27 Feb 2026 12:56:14 -0500 (EST) Received: from smtpin16.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id 3B3605B6D8 for ; Fri, 27 Feb 2026 17:56:14 +0000 (UTC) X-FDA: 84490990668.16.6A96E9E Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf29.hostedemail.com (Postfix) with ESMTP id 786CD12000E for ; Fri, 27 Feb 2026 17:56:12 +0000 (UTC) Authentication-Results: imf29.hostedemail.com; dkim=none; spf=pass (imf29.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=1772214972; 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-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Dlkoq/xt87XyBuDDsxxtPoS7XzuVtfLvfAi4BzdnN+M=; b=mrRLh3q5yjtSAnN+n9ZHwxi5iE77PSqBd7XdD9GR48dHQBuoM7vs7lw0LkKt1yTD1+0PRo FwcQ4LgODwQ2fhLJnDAKLXjXoDDaUQg3+0PSvw+7Lfo/bAsnUEcCi/Qu+LEKrR9B6mUZrd owy8EWoqYzwnzuQYTFRvQ2PprQsN9vE= ARC-Authentication-Results: i=1; imf29.hostedemail.com; dkim=none; spf=pass (imf29.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=1772214972; a=rsa-sha256; cv=none; b=gxhdlstKVzn5SrD0kJIZWuHtjIisK5W0U4Jyr25VbaI7M9nsjQquFUanCP4wuZx+qhiEYa NEaT61MAWyh/JnTJtkEBvWXzDEveQ3rGjzsdKqnejJ4X8eUQDgQK7cvQDArEt5fJcqqjIW 9SrDaU7xCSXRXKD4htvRr5PR/WWIo6s= 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 601051516; Fri, 27 Feb 2026 09:56:05 -0800 (PST) Received: from e123572-lin.arm.com (e123572-lin.cambridge.arm.com [10.1.194.54]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 49FE03F73B; Fri, 27 Feb 2026 09:56:07 -0800 (PST) From: Kevin Brodsky To: linux-hardening@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Kevin Brodsky , Andrew Morton , Andy Lutomirski , Catalin Marinas , Dave Hansen , David Hildenbrand , Ira Weiny , Jann Horn , Jeff Xu , Joey Gouly , Kees Cook , Linus Walleij , Lorenzo Stoakes , Marc Zyngier , Mark Brown , Matthew Wilcox , Maxwell Bland , "Mike Rapoport (IBM)" , Peter Zijlstra , Pierre Langlois , Quentin Perret , Rick Edgecombe , Ryan Roberts , Thomas Gleixner , Vlastimil Babka , Will Deacon , Yang Shi , Yeoreum Yun , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, x86@kernel.org Subject: [PATCH v6 06/30] arm64: set_memory: Implement set_memory_pkey() Date: Fri, 27 Feb 2026 17:54:54 +0000 Message-ID: <20260227175518.3728055-7-kevin.brodsky@arm.com> X-Mailer: git-send-email 2.51.2 In-Reply-To: <20260227175518.3728055-1-kevin.brodsky@arm.com> References: <20260227175518.3728055-1-kevin.brodsky@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 786CD12000E X-Rspamd-Server: rspam08 X-Stat-Signature: paun6rhqnmycmnokz4ddm6rwqg6t75bg X-HE-Tag: 1772214972-6829 X-HE-Meta: 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 vV+HaNZA TEa52Mw9z0njDFNOcS7s+2N3zQkb8f7vkJ/sN+6O6bQTvOlNwuh9g/yhb10jg0Njn+JxGKC1Y72UoKZ4UDx8snFphSZNNGqryOV+HXfPkVCGB7bnMH8/FePv/0AQXtkoS2g27P0dzhH77nB3cYvsCXECBXvkl63JhdYkU9+eOBt/B4FkIggRoEEJdRGJsOgHkMl+IytSTdmlaUPdKgqIU5nLY0n0Q5z+eZ+PbJbYyayOSaAw= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Implement set_memory_pkey() using POE. Signed-off-by: Kevin Brodsky --- arch/arm64/include/asm/set_memory.h | 4 ++++ arch/arm64/mm/pageattr.c | 26 ++++++++++++++++++++++++++ 2 files changed, 30 insertions(+) diff --git a/arch/arm64/include/asm/set_memory.h b/arch/arm64/include/asm/set_memory.h index 90f61b17275e..b6cd6de34abf 100644 --- a/arch/arm64/include/asm/set_memory.h +++ b/arch/arm64/include/asm/set_memory.h @@ -19,4 +19,8 @@ bool kernel_page_present(struct page *page); int set_memory_encrypted(unsigned long addr, int numpages); int set_memory_decrypted(unsigned long addr, int numpages); +#ifdef CONFIG_ARCH_HAS_KPKEYS +int set_memory_pkey(unsigned long addr, int numpages, int pkey); +#endif + #endif /* _ASM_ARM64_SET_MEMORY_H */ diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c index 358d1dc9a576..d2a7e104a5c2 100644 --- a/arch/arm64/mm/pageattr.c +++ b/arch/arm64/mm/pageattr.c @@ -9,6 +9,8 @@ #include #include #include +#include +#include #include #include @@ -359,6 +361,30 @@ int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid) return set_memory_valid(addr, nr, valid); } +#ifdef CONFIG_ARCH_HAS_KPKEYS +int set_memory_pkey(unsigned long addr, int numpages, int pkey) +{ + unsigned long set_prot = 0; + + if (!arch_kpkeys_enabled()) + return 0; + + if (!__is_lm_address(addr)) + return -EINVAL; + + if (pkey >= arch_max_pkey()) + return -EINVAL; + + set_prot |= pkey & BIT(0) ? PTE_PO_IDX_0 : 0; + set_prot |= pkey & BIT(1) ? PTE_PO_IDX_1 : 0; + set_prot |= pkey & BIT(2) ? PTE_PO_IDX_2 : 0; + + return __change_memory_common(addr, PAGE_SIZE * numpages, + __pgprot(set_prot), + __pgprot(PTE_PO_IDX_MASK)); +} +#endif + #ifdef CONFIG_DEBUG_PAGEALLOC /* * This is - apart from the return value - doing the same -- 2.51.2