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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 75A0CC25B0E for ; Mon, 15 Aug 2022 19:47:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344893AbiHOTpn (ORCPT ); Mon, 15 Aug 2022 15:45:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45052 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345026AbiHOTmJ (ORCPT ); Mon, 15 Aug 2022 15:42:09 -0400 Received: from sin.source.kernel.org (sin.source.kernel.org [IPv6:2604:1380:40e1:4800::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4A2EC6A499; Mon, 15 Aug 2022 11:47:56 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sin.source.kernel.org (Postfix) with ESMTPS id C401DCE1278; Mon, 15 Aug 2022 18:47:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9C946C433D6; Mon, 15 Aug 2022 18:47:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1660589272; bh=0pZNiys6EeeQjDyQBEPKfm5W/loToFEP2OhpcPkhyts=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bFyk5y/IupakqImUtJXcGGb29UlFvHTJx1a/4rJUKFkLShRADmCmJRsLOYh/CpHcy VCpV0/TAVq7aIYsathWmO7/x29RLaAAb34vSF6cID2k689ROC200+7uLaxmi+X7BBh 5wXBT63SfGst7iDAlUwwBBQwlSmKwv+ojW/vlyco= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Christophe Leroy , Michael Ellerman , Sasha Levin Subject: [PATCH 5.15 635/779] powerpc/32: Call mmu_mark_initmem_nx() regardless of data block mapping. Date: Mon, 15 Aug 2022 20:04:39 +0200 Message-Id: <20220815180404.482517916@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220815180337.130757997@linuxfoundation.org> References: <20220815180337.130757997@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Christophe Leroy [ Upstream commit 980bbf7ca72012d317617fcdbfabe8708e4cef29 ] mark_initmem_nx() calls either mmu_mark_initmem_nx() or set_memory_attr() based on return from v_block_mapped() of _sinittext. But we can now handle text and data independently, so that text may be mapped by block even when data is mapped by pages. On the 8xx for instance, at startup 32Mbytes of memory are pinned in TLB. So the pinned entries need to go away for sinittext. In next patch a BAT will be set to also covers sinittext on book3s/32. So it will also be needed to call mmu_mark_initmem_nx() even when data above sinittext is not mapped with BATs. As this is highly dependent on the platform, call mmu_mark_initmem_nx() regardless of data block mapping. Then the platform will know what to do. Modify 8xx mmu_mark_initmem_nx() so that inittext mapping is modified only when pagealloc debug and kfence are not active, otherwise inittext is mapped with standard pages. And don't do anything on kernel text which is already mapped with PAGE_KERNEL_TEXT. Fixes: da1adea07576 ("powerpc/8xx: Allow STRICT_KERNEL_RwX with pinned TLB") Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/db3fc14f3bfa6215b0786ef58a6e2bc1e1f964d7.1655202804.git.christophe.leroy@csgroup.eu Signed-off-by: Sasha Levin --- arch/powerpc/mm/nohash/8xx.c | 4 ++-- arch/powerpc/mm/pgtable_32.c | 6 +++--- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/arch/powerpc/mm/nohash/8xx.c b/arch/powerpc/mm/nohash/8xx.c index 0df9fe29dd56..5348e1f9eb94 100644 --- a/arch/powerpc/mm/nohash/8xx.c +++ b/arch/powerpc/mm/nohash/8xx.c @@ -183,8 +183,8 @@ void mmu_mark_initmem_nx(void) unsigned long boundary = strict_kernel_rwx_enabled() ? sinittext : etext8; unsigned long einittext8 = ALIGN(__pa(_einittext), SZ_8M); - mmu_mapin_ram_chunk(0, boundary, PAGE_KERNEL_TEXT, false); - mmu_mapin_ram_chunk(boundary, einittext8, PAGE_KERNEL, false); + if (!debug_pagealloc_enabled_or_kfence()) + mmu_mapin_ram_chunk(boundary, einittext8, PAGE_KERNEL, false); mmu_pin_tlb(block_mapped_ram, false); } diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c index f28859771440..502e3d3d1dbf 100644 --- a/arch/powerpc/mm/pgtable_32.c +++ b/arch/powerpc/mm/pgtable_32.c @@ -138,9 +138,9 @@ void mark_initmem_nx(void) unsigned long numpages = PFN_UP((unsigned long)_einittext) - PFN_DOWN((unsigned long)_sinittext); - if (v_block_mapped((unsigned long)_sinittext)) { - mmu_mark_initmem_nx(); - } else { + mmu_mark_initmem_nx(); + + if (!v_block_mapped((unsigned long)_sinittext)) { set_memory_nx((unsigned long)_sinittext, numpages); set_memory_rw((unsigned long)_sinittext, numpages); } -- 2.35.1