From nobody Fri Dec 19 20:15:56 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ABCB485626; Fri, 16 May 2025 13:44:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747403095; cv=none; b=ET58akayerFOxwjPTllZe7HUdbRNkdUSSxUN0d0twdEimW+pBQSBPo2g5lIJO19FYKC/LOrPEcI2XcFL2C1glbxe1Yfm4oMqT70T4KW+Cih5gLPEis+di9Nv1FKIO13yXSZ55Lz9dMLsKCli8Ejd0Jqc5FoW8SGsIAnYdGwjP/o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747403095; c=relaxed/simple; bh=74nDVqKBhBCs/QGZuvkqx34RtV6ZhfKSpTepUWjzrCU=; h=Date:From:To:Subject:Cc:In-Reply-To:References:MIME-Version: Message-ID:Content-Type; b=YpSQLleJTtz+PJMDtzAJMsMfyJ42KMfE9AQlYR1AN1D+RsLBsmOalACh68OXJz1Mgmh0zKNkK/FUmRrDSxgX5+G2XrUR/ziHPATTx9BhBMM3uav04w/yMXnZKIM0fnC3QOpxjrSAIfJVqV1qC4ZcZ8pkmrNlhqsE0tmoRYKDgFU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=ESNj+Ov6; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=gvdMKcau; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="ESNj+Ov6"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="gvdMKcau" Date: Fri, 16 May 2025 13:44:50 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1747403091; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=PbNzyLOQObSOaL7Xn0U5iI7XfW8VqcHp5Fxlah95OF4=; b=ESNj+Ov6ocNIdxh3hkyel3SgZUcjHQDs2Ly9EOXSnNqHfxmiI9cjze+oaMznYV/FgFNp96 AgjcWDGjri46othN1YqXTIPutyQGJphD70wRJfulPTdH3NcNqjIE7v4CvGTi1dXz+TNFbA yBlw6bovP4DhubqkeznQXBpV/ZpGRe4/896QXkHSxWNfosIO2XmAh4Dc+d3zZYo6yydHbh atWHW0ieoGndWnebIVL2WRs8hoiTQywR843hj808eGnVCRuaXzmUgOB+fBGfGVazt7EJEo zbRaPZMCXTmgouZnmCx8e//pmdCv3NoyLOrmuSEtdGSgb/fssyP8NeDkEbL8YA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1747403091; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=PbNzyLOQObSOaL7Xn0U5iI7XfW8VqcHp5Fxlah95OF4=; b=gvdMKcauNBxmfiHb9F6YDBqfi3yoBRMlZ90sJQczG68RMMAYi4hkFigS25vFUQkkazGGoz sfE+rcb9WvDSwXAw== From: "tip-bot2 for Kirill A. Shutemov" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: x86/core] x86/mm/64: Always use dynamic memory layout Cc: "Kirill A. Shutemov" , Ingo Molnar , Ard Biesheuvel , Jan Kiszka , Kieran Bingham , "H. Peter Anvin" , Dave Hansen , Linus Torvalds , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20250516123306.3812286-2-kirill.shutemov@linux.intel.com> References: <20250516123306.3812286-2-kirill.shutemov@linux.intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <174740309038.406.16951438567277617753.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Precedence: bulk Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable The following commit has been merged into the x86/core branch of tip: Commit-ID: c309b2705a4684e5c8e97e21bc9b14e2b539b87a Gitweb: https://git.kernel.org/tip/c309b2705a4684e5c8e97e21bc9b14e2b= 539b87a Author: Kirill A. Shutemov AuthorDate: Fri, 16 May 2025 15:33:03 +03:00 Committer: Ingo Molnar CommitterDate: Fri, 16 May 2025 15:12:45 +02:00 x86/mm/64: Always use dynamic memory layout Dynamic memory layout is used by KASLR and 5-level paging. CONFIG_X86_5LEVEL is going to be removed, making 5-level paging support unconditional which requires unconditional support of dynamic memory layout. Remove CONFIG_DYNAMIC_MEMORY_LAYOUT. Signed-off-by: Kirill A. Shutemov Signed-off-by: Ingo Molnar Reviewed-by: Ard Biesheuvel Cc: Jan Kiszka Cc: Kieran Bingham Cc: H. Peter Anvin Cc: Dave Hansen Cc: Linus Torvalds Link: https://lore.kernel.org/r/20250516123306.3812286-2-kirill.shutemov@li= nux.intel.com --- arch/x86/Kconfig | 8 -------- arch/x86/include/asm/page_64_types.h | 4 ---- arch/x86/include/asm/pgtable_64_types.h | 6 ------ arch/x86/kernel/head64.c | 2 -- scripts/gdb/linux/pgtable.py | 4 +--- 5 files changed, 1 insertion(+), 23 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 90570e3..22c60be 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1467,7 +1467,6 @@ config X86_PAE config X86_5LEVEL bool "Enable 5-level page tables support" default y - select DYNAMIC_MEMORY_LAYOUT select SPARSEMEM_VMEMMAP depends on X86_64 help @@ -2168,17 +2167,10 @@ config PHYSICAL_ALIGN =20 Don't change this unless you know what you are doing. =20 -config DYNAMIC_MEMORY_LAYOUT - bool - help - This option makes base addresses of vmalloc and vmemmap as well as - __PAGE_OFFSET movable during boot. - config RANDOMIZE_MEMORY bool "Randomize the kernel memory sections" depends on X86_64 depends on RANDOMIZE_BASE - select DYNAMIC_MEMORY_LAYOUT default RANDOMIZE_BASE help Randomizes the base virtual address of kernel memory sections diff --git a/arch/x86/include/asm/page_64_types.h b/arch/x86/include/asm/pa= ge_64_types.h index 1faa8f8..6b8c816 100644 --- a/arch/x86/include/asm/page_64_types.h +++ b/arch/x86/include/asm/page_64_types.h @@ -41,11 +41,7 @@ #define __PAGE_OFFSET_BASE_L5 _AC(0xff11000000000000, UL) #define __PAGE_OFFSET_BASE_L4 _AC(0xffff888000000000, UL) =20 -#ifdef CONFIG_DYNAMIC_MEMORY_LAYOUT #define __PAGE_OFFSET page_offset_base -#else -#define __PAGE_OFFSET __PAGE_OFFSET_BASE_L4 -#endif /* CONFIG_DYNAMIC_MEMORY_LAYOUT */ =20 #define __START_KERNEL_map _AC(0xffffffff80000000, UL) =20 diff --git a/arch/x86/include/asm/pgtable_64_types.h b/arch/x86/include/asm= /pgtable_64_types.h index e83721d..eee06f7 100644 --- a/arch/x86/include/asm/pgtable_64_types.h +++ b/arch/x86/include/asm/pgtable_64_types.h @@ -128,15 +128,9 @@ extern unsigned int ptrs_per_p4d; #define __VMEMMAP_BASE_L4 0xffffea0000000000UL #define __VMEMMAP_BASE_L5 0xffd4000000000000UL =20 -#ifdef CONFIG_DYNAMIC_MEMORY_LAYOUT # define VMALLOC_START vmalloc_base # define VMALLOC_SIZE_TB (pgtable_l5_enabled() ? VMALLOC_SIZE_TB_L5 : VMAL= LOC_SIZE_TB_L4) # define VMEMMAP_START vmemmap_base -#else -# define VMALLOC_START __VMALLOC_BASE_L4 -# define VMALLOC_SIZE_TB VMALLOC_SIZE_TB_L4 -# define VMEMMAP_START __VMEMMAP_BASE_L4 -#endif /* CONFIG_DYNAMIC_MEMORY_LAYOUT */ =20 #ifdef CONFIG_RANDOMIZE_MEMORY # define DIRECT_MAP_PHYSMEM_END direct_map_physmem_end diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c index 14f7dda..9f617be 100644 --- a/arch/x86/kernel/head64.c +++ b/arch/x86/kernel/head64.c @@ -59,14 +59,12 @@ unsigned int ptrs_per_p4d __ro_after_init =3D 1; EXPORT_SYMBOL(ptrs_per_p4d); #endif =20 -#ifdef CONFIG_DYNAMIC_MEMORY_LAYOUT unsigned long page_offset_base __ro_after_init =3D __PAGE_OFFSET_BASE_L4; EXPORT_SYMBOL(page_offset_base); unsigned long vmalloc_base __ro_after_init =3D __VMALLOC_BASE_L4; EXPORT_SYMBOL(vmalloc_base); unsigned long vmemmap_base __ro_after_init =3D __VMEMMAP_BASE_L4; EXPORT_SYMBOL(vmemmap_base); -#endif =20 /* Wipe all early page tables except for the kernel symbol map */ static void __init reset_early_page_tables(void) diff --git a/scripts/gdb/linux/pgtable.py b/scripts/gdb/linux/pgtable.py index 30d837f..09aac24 100644 --- a/scripts/gdb/linux/pgtable.py +++ b/scripts/gdb/linux/pgtable.py @@ -29,11 +29,9 @@ def page_mask(level=3D1): raise Exception(f'Unknown page level: {level}') =20 =20 -#page_offset_base in case CONFIG_DYNAMIC_MEMORY_LAYOUT is disabled -POB_NO_DYNAMIC_MEM_LAYOUT =3D '0xffff888000000000' def _page_offset_base(): pob_symbol =3D gdb.lookup_global_symbol('page_offset_base') - pob =3D pob_symbol.name if pob_symbol else POB_NO_DYNAMIC_MEM_LAYOUT + pob =3D pob_symbol.name return gdb.parse_and_eval(pob)