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 80207CDB46F for ; Mon, 22 Jun 2026 13:06:42 +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: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=sLW3835ooF/gyASPq4HfcxuD4xTqS9E83di9vyQnNuU=; b=b/oqdcP57roBu9OT86GILO035L NJuIVkBlRVHMLYa9r39bUD2AIDts8Cfpr5jNZeiKjCdS8oz7K8hrNMxUtoOqCH9P4Ix1FH/X9DGAN 13ePCpHIkeBg9HKx98kkwdWg2JktRda7lPx5fjLfSmTVjAdqrpi2FStwnB9HoR1lED9F88kfGjsA8 RuHRZ4hMxlZuZ1CVu7OBUQAYe8c2zQ7Xvabv8qvF/hUtx3NHCvKeQeMSFXFiql7Y0U/JuabTKNiSB 2VO2pDWflV80iLfmHmtxtUJRO/WvlC1yxa5c0Vj1jZrNeameQeXbrA71lH8VZc4hWIxkiaQgjNxOs MBiNkw7A==; 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charset=UTF-8 Content-Transfer-Encoding: 7bit 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 On 5/26/26 13:15, Kevin Brodsky wrote: > In preparation of using POE inside the kernel, enable "Overlay > applied" for kernel memory types in PIR_EL1. This ensures that the > permissions set in POR_EL1 affect all kernel mappings. > > User memory types must be left untouched (overlays not applied) > because any privileged access to user memory (e.g. futex atomic > without FEAT_LSUI) would then be mistakenly checked against POR_EL1. That makes sense. Still learning the architecture, but ... leaving the user bits as is sounds good to me (and unrelated to using overlays for kernel memory). Reviewed-by: David Hildenbrand (Arm) > > Signed-off-by: Kevin Brodsky > --- > arch/arm64/include/asm/pgtable-prot.h | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/arch/arm64/include/asm/pgtable-prot.h b/arch/arm64/include/asm/pgtable-prot.h > index 212ce1b02e15..d4d45ab86a5a 100644 > --- a/arch/arm64/include/asm/pgtable-prot.h > +++ b/arch/arm64/include/asm/pgtable-prot.h > @@ -183,9 +183,9 @@ static inline bool __pure lpa2_is_enabled(void) > PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_SHARED_EXEC), PIE_RW) | \ > PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_READONLY), PIE_R) | \ > PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_SHARED), PIE_RW) | \ > - PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_KERNEL_ROX), PIE_RX) | \ > - PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_KERNEL_EXEC), PIE_RWX) | \ > - PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_KERNEL_RO), PIE_R) | \ > - PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_KERNEL), PIE_RW)) > + PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_KERNEL_ROX), PIE_RX_O) | \ > + PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_KERNEL_EXEC), PIE_RWX_O) | \ > + PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_KERNEL_RO), PIE_R_O) | \ > + PIRx_ELx_PERM_PREP(pte_pi_index(_PAGE_KERNEL), PIE_RW_O)) > > #endif /* __ASM_PGTABLE_PROT_H */ > -- Cheers, David