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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6978CFEFB70 for ; Fri, 27 Feb 2026 17:56:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Dlkoq/xt87XyBuDDsxxtPoS7XzuVtfLvfAi4BzdnN+M=; b=wZ7g0fVDu7QfhwHpeuMH/c9Cg0 0aeqphRDll14zpJjf5Zo2VPCHPnJYwN32+Sx51ggIhVAY/xEd3UFItxY09DtBi5AAs4lG3o8uBApg cPlnlUurNNwqmJSYIUb5yvK0EDFmehXwVPrzhlhuBQtcgou6tflh1tOn/yWYBzLuif8WOUmcLRWal 8ZdU2G1epLvpcEykI7p5BM/6tZojasfBmfsOZJRfAp1OIUkvuKjHkrsjyndbxnX4K55V9Sxm7L0E2 zs8hWPkr4RqtqqSDodIWlq+asg53H0iImhXKCTJQUf+ZUeTVLhYGrkOP8OAeJh2iMV2hYeGfnTJKg RZd4qFFQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vw24X-00000008qVL-2kq3; Fri, 27 Feb 2026 17:56:17 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vw24S-00000008qRs-2wHg for linux-arm-kernel@lists.infradead.org; Fri, 27 Feb 2026 17:56:13 +0000 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-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260227_095612_862700_5DE93E63 X-CRM114-Status: GOOD ( 12.80 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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