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imf15.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=arm.com; spf=pass (imf15.hostedemail.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=kevin.brodsky@arm.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1772215061; a=rsa-sha256; cv=none; b=xqri0C9LYtmjXROHIu8CsbFIKEuCx7Dkf/UAwhXBGWoQt2JdV9x0o4EASAFjLWNJhUFQ6R 37hfkofES+JMHrdImKXdMDXGc8ZDrxIwiJeRwboTbeBAfO5MUlvp4cMCDf4pheE3eSl2Ly JAouQ7x36DOkvCMg3jMWN2kbuWIbaH4= 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 7F69A176B; Fri, 27 Feb 2026 09:57:34 -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 6C9833F73B; Fri, 27 Feb 2026 09:57:36 -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 25/30] arm64: kpkeys: Protect early page tables Date: Fri, 27 Feb 2026 17:55:13 +0000 Message-ID: <20260227175518.3728055-26-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-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 974E8A000B X-Stat-Signature: opqfmstaihmuj1gdcf1cqwf4ncg5e9n5 X-Rspam-User: X-HE-Tag: 1772215061-891609 X-HE-Meta: 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 EHFlf+85 3+KrwJLnC+DYc3tBEZDbYOGZzq4A/MPBJ4DzCYbVxp3IJ3oeBrLYzxIWIq8cEIWtEQzzOXvDVsgrMo0yYe2GEBK7FTucBr0IXpUPTheDx7pldzJkYvMu0iCKOlUfbFABLN8lxc82f6VTR37pndh8uWOXktgAbFGSUsdHLVIixxyq0kcwoI9j7fT6mQufM6R1Uhf3zG3Li/OImcok= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Use the dedicated kpkeys allocator for early page tables (used to create the linear map) when the kpkeys_hardened_pgtables feature is enabled. CPU features have not been detected at this stage so we use the early helper arm64_supports_kpkeys_hardened_pgtables(). This is not a concern as kpkeys_physmem_pgtable_alloc() does not itself use POE or set_memory_pkey(). Signed-off-by: Kevin Brodsky --- arch/arm64/mm/mmu.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index 2cee0b7f8a56..7072d5ac0579 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -116,8 +116,11 @@ static phys_addr_t __init early_pgtable_alloc(enum pgtable_type pgtable_type) { phys_addr_t phys; - phys = memblock_phys_alloc_range(PAGE_SIZE, PAGE_SIZE, 0, - MEMBLOCK_ALLOC_NOLEAKTRACE); + if (arm64_supports_kpkeys_hardened_pgtables()) + phys = kpkeys_physmem_pgtable_alloc(); + else + phys = memblock_phys_alloc_range(PAGE_SIZE, PAGE_SIZE, 0, + MEMBLOCK_ALLOC_NOLEAKTRACE); if (!phys) panic("Failed to allocate page table page\n"); -- 2.51.2