diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S index 7bf52ee0a805..4471f570a295 100644 --- a/arch/arm64/kernel/head.S +++ b/arch/arm64/kernel/head.S @@ -287,18 +287,20 @@ __create_page_tables: mov x28, lr /* - * Invalidate the idmap and swapper page tables to avoid potential - * dirty cache lines being evicted. + * Invalidate the init page tables to avoid potential dirty cache lines + * being evicted. Other page tables are allocated in rodata as part of + * the kernel image, and thus are clean to the PoC per the boot + * protocol. */ - adrp x0, idmap_pg_dir + adrp x0, init_pg_dir adrp x1, init_pg_end sub x1, x1, x0 bl __inval_dcache_area /* - * Clear the idmap and swapper page tables. + * Clear the init page tables. */ - adrp x0, idmap_pg_dir + adrp x0, init_pg_dir adrp x1, init_pg_end sub x1, x1, x0 1: stp xzr, xzr, [x0], #16 diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S index ac4c10351b17..ab29c06a7d4b 100644 --- a/arch/arm64/kernel/vmlinux.lds.S +++ b/arch/arm64/kernel/vmlinux.lds.S @@ -138,6 +138,23 @@ SECTIONS EXCEPTION_TABLE(8) /* __init_begin will be marked RO NX */ NOTES + . = ALIGN(PAGE_SIZE); + idmap_pg_dir = .; + . += IDMAP_DIR_SIZE; + +#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 + tramp_pg_dir = .; + . += PAGE_SIZE; +#endif + +#ifdef CONFIG_ARM64_SW_TTBR0_PAN + reserved_ttbr0 = .; + . += RESERVED_TTBR0_SIZE; +#endif + swapper_pg_dir = .; + . += PAGE_SIZE; + swapper_pg_end = .; + . = ALIGN(SEGMENT_ALIGN); __init_begin = .; __inittext_begin = .; @@ -216,22 +233,6 @@ SECTIONS BSS_SECTION(0, 0, 0) . = ALIGN(PAGE_SIZE); - idmap_pg_dir = .; - . += IDMAP_DIR_SIZE; - -#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 - tramp_pg_dir = .; - . += PAGE_SIZE; -#endif - -#ifdef CONFIG_ARM64_SW_TTBR0_PAN - reserved_ttbr0 = .; - . += RESERVED_TTBR0_SIZE; -#endif - swapper_pg_dir = .; - . += PAGE_SIZE; - swapper_pg_end = .; - init_pg_dir = .; . += INIT_DIR_SIZE; init_pg_end = .;