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From: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
To: Catalin Marinas <catalin.marinas@arm.com>,
	Jonathan Corbet <corbet@lwn.net>, Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org
Subject: [PATCH v2 16/16] arm64: text replication: add Kconfig
Date: Thu, 27 Jul 2023 16:31:17 +0100	[thread overview]
Message-ID: <E1qP2xR-001CYS-Ti@rmk-PC.armlinux.org.uk> (raw)
In-Reply-To: <ZMKNYEkM7YnrDtOt@shell.armlinux.org.uk>

Add the Kconfig symbol for kernel text replication. This unfortunately
requires KASAN and kernel text randomisation options to be disabled at
the moment.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 arch/arm64/Kconfig | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 7856c3a3e35a..53143324c392 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -160,7 +160,7 @@ config ARM64
 	select HAVE_ARCH_HUGE_VMAP
 	select HAVE_ARCH_JUMP_LABEL
 	select HAVE_ARCH_JUMP_LABEL_RELATIVE
-	select HAVE_ARCH_KASAN if !(ARM64_16K_PAGES && ARM64_VA_BITS_48)
+	select HAVE_ARCH_KASAN if !(ARM64_16K_PAGES && ARM64_VA_BITS_48 && !REPLICATE_KTEXT)
 	select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN
 	select HAVE_ARCH_KASAN_SW_TAGS if HAVE_ARCH_KASAN
 	select HAVE_ARCH_KASAN_HW_TAGS if (HAVE_ARCH_KASAN && ARM64_MTE)
@@ -1426,6 +1426,13 @@ config NODES_SHIFT
 	  Specify the maximum number of NUMA Nodes available on the target
 	  system.  Increases memory reserved to accommodate various tables.
 
+config REPLICATE_KTEXT
+	bool "Replicate kernel text across numa nodes"
+	depends on NUMA
+	help
+	  Say Y here to enable replicating the kernel text across multiple
+	  nodes in a NUMA cluster.  This trades memory for speed.
+
 source "kernel/Kconfig.hz"
 
 config ARCH_SPARSEMEM_ENABLE
@@ -2173,6 +2180,7 @@ config RELOCATABLE
 
 config RANDOMIZE_BASE
 	bool "Randomize the address of the kernel image"
+	depends on !REPLICATE_KTEXT
 	select RELOCATABLE
 	help
 	  Randomizes the virtual address at which the kernel image is
-- 
2.30.2


WARNING: multiple messages have this Message-ID (diff)
From: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
To: Catalin Marinas <catalin.marinas@arm.com>,
	Jonathan Corbet <corbet@lwn.net>, Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org
Subject: [PATCH v2 16/16] arm64: text replication: add Kconfig
Date: Thu, 27 Jul 2023 16:31:17 +0100	[thread overview]
Message-ID: <E1qP2xR-001CYS-Ti@rmk-PC.armlinux.org.uk> (raw)
In-Reply-To: <ZMKNYEkM7YnrDtOt@shell.armlinux.org.uk>

Add the Kconfig symbol for kernel text replication. This unfortunately
requires KASAN and kernel text randomisation options to be disabled at
the moment.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 arch/arm64/Kconfig | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 7856c3a3e35a..53143324c392 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -160,7 +160,7 @@ config ARM64
 	select HAVE_ARCH_HUGE_VMAP
 	select HAVE_ARCH_JUMP_LABEL
 	select HAVE_ARCH_JUMP_LABEL_RELATIVE
-	select HAVE_ARCH_KASAN if !(ARM64_16K_PAGES && ARM64_VA_BITS_48)
+	select HAVE_ARCH_KASAN if !(ARM64_16K_PAGES && ARM64_VA_BITS_48 && !REPLICATE_KTEXT)
 	select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN
 	select HAVE_ARCH_KASAN_SW_TAGS if HAVE_ARCH_KASAN
 	select HAVE_ARCH_KASAN_HW_TAGS if (HAVE_ARCH_KASAN && ARM64_MTE)
@@ -1426,6 +1426,13 @@ config NODES_SHIFT
 	  Specify the maximum number of NUMA Nodes available on the target
 	  system.  Increases memory reserved to accommodate various tables.
 
+config REPLICATE_KTEXT
+	bool "Replicate kernel text across numa nodes"
+	depends on NUMA
+	help
+	  Say Y here to enable replicating the kernel text across multiple
+	  nodes in a NUMA cluster.  This trades memory for speed.
+
 source "kernel/Kconfig.hz"
 
 config ARCH_SPARSEMEM_ENABLE
@@ -2173,6 +2180,7 @@ config RELOCATABLE
 
 config RANDOMIZE_BASE
 	bool "Randomize the address of the kernel image"
+	depends on !REPLICATE_KTEXT
 	select RELOCATABLE
 	help
 	  Randomizes the virtual address at which the kernel image is
-- 
2.30.2


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  parent reply	other threads:[~2023-07-27 15:31 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-07-27 15:29 [PATCH v2 00/17] arm64 kernel text replication Russell King (Oracle)
2023-07-27 15:29 ` Russell King (Oracle)
2023-07-27 15:30 ` [PATCH v2 01/16] arm64: provide cpu_replace_ttbr1_phys() Russell King (Oracle)
2023-07-27 15:30   ` Russell King (Oracle)
2023-07-27 15:30 ` [PATCH v2 02/16] arm64: make clean_dcache_range_nopatch() visible Russell King (Oracle)
2023-07-27 15:30   ` Russell King (Oracle)
2023-07-27 15:30 ` [PATCH v2 03/16] arm64: place kernel in its own L0 page table entry Russell King (Oracle)
2023-07-27 15:30   ` Russell King (Oracle)
2023-07-27 15:30 ` [PATCH v2 04/16] arm64: text replication: add init function Russell King (Oracle)
2023-07-27 15:30   ` Russell King (Oracle)
2023-07-27 15:30 ` [PATCH v2 05/16] arm64: text replication: add sanity checks Russell King (Oracle)
2023-07-27 15:30   ` Russell King (Oracle)
2023-07-27 15:30 ` [PATCH v2 06/16] arm64: text replication: copy initial kernel text Russell King (Oracle)
2023-07-27 15:30   ` Russell King (Oracle)
2023-07-27 15:30 ` [PATCH v2 07/16] arm64: text replication: add node text patching Russell King (Oracle)
2023-07-27 15:30   ` Russell King (Oracle)
2023-07-27 15:30 ` [PATCH v2 08/16] arm64: text replication: add node 0 page table definitions Russell King (Oracle)
2023-07-27 15:30   ` Russell King (Oracle)
2023-07-27 15:30 ` [PATCH v2 09/16] arm64: text replication: add swapper page directory helpers Russell King (Oracle)
2023-07-27 15:30   ` Russell King (Oracle)
2023-07-27 15:30 ` [PATCH v2 10/16] arm64: text replication: create per-node kernel page tables Russell King (Oracle)
2023-07-27 15:30   ` Russell King (Oracle)
2023-07-27 15:30 ` [PATCH v2 11/16] arm64: text replication: boot secondary CPUs with appropriate TTBR1 Russell King (Oracle)
2023-07-27 15:30   ` Russell King (Oracle)
2023-07-27 15:30 ` [PATCH v2 12/16] arm64: text replication: update cnp support Russell King (Oracle)
2023-07-27 15:30   ` Russell King (Oracle)
2023-07-27 15:31 ` [PATCH v2 13/16] arm64: text replication: setup page tables for copied kernel Russell King (Oracle)
2023-07-27 15:31   ` Russell King (Oracle)
2023-07-27 15:31 ` [PATCH v2 14/16] arm64: text replication: include most of read-only data as well Russell King (Oracle)
2023-07-27 15:31   ` Russell King (Oracle)
2023-07-27 15:31 ` [PATCH v2 15/16] arm64: text replication: early kernel option to enable replication Russell King (Oracle)
2023-07-27 15:31   ` Russell King (Oracle)
2023-07-27 15:31 ` Russell King (Oracle) [this message]
2023-07-27 15:31   ` [PATCH v2 16/16] arm64: text replication: add Kconfig Russell King (Oracle)
2023-07-27 15:36   ` Randy Dunlap
2023-07-27 15:36     ` Randy Dunlap

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