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[RFC,17/17] arm64: text replication: add Kconfig

Message ID E1q3zz3-00A5M8-0M@rmk-PC.armlinux.org.uk (mailing list archive)
State New, archived
Headers show
Series arm64 kernel text replication | expand

Commit Message

Russell King (Oracle) May 30, 2023, 2:05 p.m. UTC 
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(-)
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Patch

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index b1201d25a8a4..e1120841e26e 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -159,7 +159,7 @@  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)
@@ -1400,6 +1400,13 @@  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
@@ -2167,6 +2174,7 @@  config RELOCATABLE
 
 config RANDOMIZE_BASE
 	bool "Randomize the address of the kernel image"
+	depends on !REPLICATE_KTEXT
 	select ARM64_MODULE_PLTS if MODULES
 	select RELOCATABLE
 	help