From: "Russell King (Oracle)" <rmk+kernel@xxxxxxxxxxxxxxx> Add the Kconfig symbol for kernel text replication. This unfortunately requires KASAN and kernel text randomisation options to be disabled at the moment. Currently, we do not support CONFIG_ARM64_16K_PAGES and CONFIG_PGTABLE_LEVLS=4, because PGDIR_SIZE is 128T, which is too large to allow the kernel text to exclusively occupy an L0 page table entry. Signed-off-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx> --- arch/arm64/Kconfig | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 8f6cf1221b6a..a9dfe6e0006a 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -163,7 +163,7 @@ 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) @@ -1443,6 +1443,13 @@ 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 && !(ARM64_16K_PAGES && ARM64_VA_BITS_48) + 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 @@ -2161,6 +2168,7 @@ 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 -- 2.20.1
