From d253ca0c3865a8d9a8c01143cf20425e0be4d0ce Mon Sep 17 00:00:00 2001 From: Rick Edgecombe Date: Thu, 25 Apr 2019 17:11:34 -0700 Subject: x86/mm/cpa: Add set_direct_map_*() functions Add two new functions set_direct_map_default_noflush() and set_direct_map_invalid_noflush() for setting the direct map alias for the page to its default valid permissions and to an invalid state that cannot be cached in a TLB, respectively. These functions do not flush the TLB. Note, __kernel_map_pages() does something similar but flushes the TLB and doesn't reset the permission bits to default on all architectures. Also add an ARCH config ARCH_HAS_SET_DIRECT_MAP for specifying whether these have an actual implementation or a default empty one. Signed-off-by: Rick Edgecombe Signed-off-by: Peter Zijlstra (Intel) Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Dave Hansen Cc: H. Peter Anvin Cc: Linus Torvalds Cc: Nadav Amit Cc: Rik van Riel Cc: Thomas Gleixner Link: https://lkml.kernel.org/r/20190426001143.4983-15-namit@vmware.com Signed-off-by: Ingo Molnar --- arch/Kconfig | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'arch/Kconfig') diff --git a/arch/Kconfig b/arch/Kconfig index 33687dddd86a..88e5a92a9e58 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -249,6 +249,10 @@ config ARCH_HAS_FORTIFY_SOURCE config ARCH_HAS_SET_MEMORY bool +# Select if arch has all set_direct_map_invalid/default() functions +config ARCH_HAS_SET_DIRECT_MAP + bool + # Select if arch init_task must go in the __init_task_data section config ARCH_TASK_STRUCT_ON_STACK bool -- cgit v1.2.3